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/*
 * Copyright (c) 2015, Haiyang Li.
 * 
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.landawn.abacus.util;

import java.io.IOException;
import java.io.OutputStreamWriter;
import java.io.Writer;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collection;
import java.util.Iterator;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;
import java.util.NoSuchElementException;
import java.util.Set;

import com.landawn.abacus.DataSet;
import com.landawn.abacus.core.RowDataSet;
import com.landawn.abacus.exception.UncheckedIOException;
import com.landawn.abacus.parser.KryoParser;
import com.landawn.abacus.parser.ParserFactory;
import com.landawn.abacus.util.function.IntFunction;
import com.landawn.abacus.util.stream.IntStream;
import com.landawn.abacus.util.stream.ObjIteratorEx;
import com.landawn.abacus.util.stream.Stream;

/**
 * 
  • 
 * {@code R} = Row, {@code C} = Column, {@code H} = Horizontal, {@code V} = Vertical.
 * 
    • 
 *
 * @since 0.8
 *
 * @author Haiyang Li
 */
public final class Sheet implements Cloneable {
    private static final KryoParser kryoParser = ParserFactory.isKryoAvailable() ? ParserFactory.createKryoParser() : null;

    private final Set _rowKeySet;
    private final Set _columnKeySet;
    private BiMap _rowKeyIndexMap;
    private BiMap _columnKeyIndexMap;
    private List> _columnList;
    private boolean _initialized = false;
    private boolean _isFrozen = false;

    public Sheet() {
        this(N.EMPTY_LIST, N.EMPTY_LIST);
    }

    public Sheet(Collection rowKeySet, Collection columnKeySet) {
        this._rowKeySet = N.newLinkedHashSet(rowKeySet);
        this._columnKeySet = N.newLinkedHashSet(columnKeySet);
    }

    public Sheet(Collection rowKeySet, Collection columnKeySet, Object[][] rows) {
        this(rowKeySet, columnKeySet);

        final int rowLength = this.rowLength();
        final int columnLength = this.columnLength();

        if (N.notNullOrEmpty(rows)) {
            N.checkArgument(rows.length == rowLength, "The length of array is not equal to size of row/column key set");

            for (Object[] e : rows) {
                N.checkArgument(e.length == columnLength, "The length of array is not equal to size of row/column key set");
            }

            initIndexMap();

            _columnList = new ArrayList<>(columnLength);

            for (int i = 0; i < columnLength; i++) {
                final List column = new ArrayList<>(rowLength);

                for (int j = 0; j < rowLength; j++) {
                    column.add((E) rows[j][i]);
                }

                _columnList.add(column);
            }

            _initialized = true;
        }
    }

    public static  Sheet rows(Collection rowKeySet, Collection columnKeySet, Object[][] rows) {
        return new Sheet<>(rowKeySet, columnKeySet, rows);
    }

    public static  Sheet rows(Collection rowKeySet, Collection columnKeySet, Collection> rows) {
        final Sheet instance = new Sheet<>(rowKeySet, columnKeySet);

        final int rowLength = instance.rowLength();
        final int columnLength = instance.columnLength();

        if (N.notNullOrEmpty(rows)) {
            N.checkArgument(rows.size() == rowLength, "The size of collection is not equal to size of row/column key set");

            for (Collection e : rows) {
                N.checkArgument(e.size() == columnLength, "The size of collection is not equal to size of row/column key set");
            }

            instance.initIndexMap();

            instance._columnList = new ArrayList<>(columnLength);

            for (int i = 0; i < columnLength; i++) {
                instance._columnList.add(new ArrayList(rowLength));
            }

            for (Collection row : rows) {
                final Iterator iter = row.iterator();

                for (int i = 0; i < columnLength; i++) {
                    instance._columnList.get(i).add(iter.next());
                }
            }

            instance._initialized = true;
        }

        return instance;

    }

    public static  Sheet columns(Collection rowKeySet, Collection columnKeySet, Object[][] columns) {
        final Sheet instance = new Sheet<>(rowKeySet, columnKeySet);

        final int rowLength = instance.rowLength();
        final int columnLength = instance.columnLength();

        if (N.notNullOrEmpty(columns)) {
            N.checkArgument(columns.length == columnLength, "The length of array is not equal to size of row/column key set");

            for (Object[] e : columns) {
                N.checkArgument(e.length == rowLength, "The length of array is not equal to size of row/column key set");
            }

            instance.initIndexMap();

            instance._columnList = new ArrayList<>(columnLength);

            for (Object[] column : columns) {
                instance._columnList.add(new ArrayList<>((List) Arrays.asList(column)));
            }

            instance._initialized = true;
        }

        return instance;
    }

    public static  Sheet columns(Collection rowKeySet, Collection columnKeySet, Collection> columns) {
        final Sheet instance = new Sheet<>(rowKeySet, columnKeySet);

        final int rowLength = instance.rowLength();
        final int columnLength = instance.columnLength();

        if (N.notNullOrEmpty(columns)) {
            N.checkArgument(columns.size() == columnLength, "The size of collection is not equal to size of row/column key set");

            for (Collection e : columns) {
                N.checkArgument(e.size() == rowLength, "The size of collection is not equal to size of row/column key set");
            }

            instance.initIndexMap();

            instance._columnList = new ArrayList<>(columnLength);

            for (Collection column : columns) {
                instance._columnList.add(new ArrayList<>(column));
            }

            instance._initialized = true;
        }

        return instance;
    }

    public Set rowKeySet() {
        return _rowKeySet;
    }

    public Set columnKeySet() {
        return _columnKeySet;
    }

    public E get(Object rowKey, Object columnKey) {
        if (_initialized) {
            final int rowIndex = getRowIndex(rowKey);
            final int columnIndex = getColumnIndex(columnKey);

            return get(rowIndex, columnIndex);
        } else {
            checkRowKey(rowKey);
            checkColumnKey(columnKey);

            return null;
        }
    }

    /**
     *
     * @param rowIndex
     * @param columnIndex
     * @return
     */
    public E get(int rowIndex, int columnIndex) {
        if (_initialized) {
            return _columnList.get(columnIndex).get(rowIndex);
        } else {
            checkRowIndex(rowIndex);
            checkColumnIndex(columnIndex);

            return null;
        }
    }

    public E get(IntPair point) {
        return get(point._1, point._2);
    }

    /**
     * 
     * @param rowKey
     * @param columnKey
     * @param value
     * @return
     * @throws IllegalArgumentException
     */
    public E put(R rowKey, C columnKey, E value) throws IllegalArgumentException {
        checkFrozen();

        init();

        //    if (!containsRow(rowKey)) {
        //        addRow(rowKey, null);
        //    }
        //
        //    if (!containsColumn(columnKey)) {
        //        addColumn(columnKey, null);
        //    }

        final int rowIndex = getRowIndex(rowKey);
        final int columnIndex = getColumnIndex(columnKey);

        return put(rowIndex, columnIndex, value);
    }

    public E put(int rowIndex, int columnIndex, E value) {
        checkFrozen();

        init();

        final Object previousValue = _columnList.get(columnIndex).get(rowIndex);
        _columnList.get(columnIndex).set(rowIndex, value);

        return (E) previousValue;
    }

    public E put(IntPair point, E value) {
        return put(point._1, point._2, value);
    }

    /**
     * 
     * @param source
     * @throws IllegalArgumentException
     */
    public void putAll(Sheet source) throws IllegalArgumentException {
        checkFrozen();

        if (!this.rowKeySet().containsAll(source.rowKeySet())) {
            throw new IllegalArgumentException(source.rowKeySet() + " are not all included in this sheet with row key set: " + this.rowKeySet());
        }

        if (!this.columnKeySet().containsAll(source.columnKeySet())) {
            throw new IllegalArgumentException(source.columnKeySet() + " are not all included in this sheet with column key set: " + this.columnKeySet());
        }

        final Sheet tmp = (Sheet) source;

        for (R r : tmp.rowKeySet()) {
            for (C c : tmp.columnKeySet()) {
                // this.put(r, c, tmp.get(r, c));

                put(getRowIndex(r), getColumnIndex(c), tmp.get(r, c));
            }
        }
    }

    public E remove(Object rowKey, Object columnKey) {
        checkFrozen();

        if (_initialized) {
            final int rowIndex = getRowIndex(rowKey);
            final int columnIndex = getColumnIndex(columnKey);

            return remove(rowIndex, columnIndex);
        } else {
            checkRowKey(rowKey);
            checkColumnKey(columnKey);

            return null;
        }
    }

    public E remove(int rowIndex, int columnIndex) {
        checkFrozen();

        if (_initialized) {
            return _columnList.get(columnIndex).set(rowIndex, null);
        } else {
            checkRowIndex(rowIndex);
            checkColumnIndex(columnIndex);

            return null;
        }
    }

    public E remove(IntPair point) {
        return remove(point._1, point._2);
    }

    public boolean contains(Object rowKey, Object columnKey) {
        return get(rowKey, columnKey) != null;
    }

    public boolean containsValue(Object value) {
        //        if (value == null) {
        //            for (R r : rowKeySet()) {
        //                for (C c : columnKeySet()) {
        //                    if (this.get(r, c) == null) {
        //                        return true;
        //                    }
        //                }
        //            }
        //        } else {
        //            for (R r : rowKeySet()) {
        //                for (C c : columnKeySet()) {
        //                    if (value.equals(this.get(r, c))) {
        //                        return true;
        //                    }
        //                }
        //            }
        //        }
        //
        //        return false;

        if (this._initialized) {
            for (List column : _columnList) {
                if (column.contains(value)) {
                    return true;
                }
            }

            return false;
        } else {
            return value == null;
        }
    }

    public List getRow(Object rowKey) {
        final int columnLength = columnLength();
        final List row = new ArrayList<>(columnLength);

        if (_initialized) {
            final int rowIndex = getRowIndex(rowKey);

            for (int columnIndex = 0; columnIndex < columnLength; columnIndex++) {
                row.add(_columnList.get(columnIndex).get(rowIndex));
            }
        } else {
            checkRowKey(rowKey);

            N.fill(row, 0, columnLength, null);
        }

        return ImmutableList.of(row);
    }

    public void setRow(R rowKey, Collection row) {
        final int columnLength = columnLength();

        if (N.notNullOrEmpty(row) && row.size() != columnLength) {
            throw new IllegalArgumentException("The size of specified row: " + row.size() + " doesn't match the length of column key set: " + columnLength);
        }

        init();

        final int rowIndex = getRowIndex(rowKey);

        if (N.isNullOrEmpty(row)) {
            for (int columnIndex = 0; columnIndex < columnLength; columnIndex++) {
                _columnList.get(columnIndex).set(rowIndex, null);
            }
        } else {
            final Iterator iter = row.iterator();

            for (int columnIndex = 0; columnIndex < columnLength; columnIndex++) {
                _columnList.get(columnIndex).set(rowIndex, iter.next());
            }
        }
    }

    public void addRow(R rowKey, Collection row) {
        checkFrozen();

        if (_rowKeySet.contains(rowKey)) {
            throw new IllegalArgumentException("Row '" + rowKey + "' already existed");
        }

        final int rowLength = rowLength();
        final int columnLength = columnLength();

        if (N.notNullOrEmpty(row) && row.size() != columnLength) {
            throw new IllegalArgumentException("The size of specified row: " + row.size() + " doesn't match the length of column key set: " + columnLength);
        }

        init();

        _rowKeySet.add(rowKey);
        _rowKeyIndexMap.put(rowKey, rowLength);

        if (N.isNullOrEmpty(row)) {
            for (int columnIndex = 0; columnIndex < columnLength; columnIndex++) {
                _columnList.get(columnIndex).add(null);
            }
        } else {
            final Iterator iter = row.iterator();

            for (int columnIndex = 0; columnIndex < columnLength; columnIndex++) {
                _columnList.get(columnIndex).add(iter.next());
            }
        }
    }

    public void addRow(final int rowIndex, final R rowKey, final Collection row) {
        checkFrozen();

        final int rowLength = rowLength();
        final int columnLength = columnLength();

        if (rowIndex == rowLength) {
            addRow(rowKey, row);
            return;
        }

        if (rowIndex < 0 || rowIndex > rowLength) {
            throw new IllegalArgumentException("Invalid row index: " + rowIndex + ". It must be: >= 0 and <= " + rowLength);
        }

        if (_rowKeySet.contains(rowKey)) {
            throw new IllegalArgumentException("Row '" + rowKey + "' already existed");
        }

        if (N.notNullOrEmpty(row) && row.size() != columnLength) {
            throw new IllegalArgumentException("The size of specified row: " + row.size() + " doesn't match the length of column key set: " + columnLength);
        }

        init();

        final List tmp = new ArrayList<>(rowLength + 1);
        tmp.addAll(_rowKeySet);
        tmp.add(rowIndex, rowKey);

        _rowKeySet.clear();
        _rowKeySet.addAll(tmp);

        for (int i = _rowKeyIndexMap.size() - 1; i >= rowIndex; i--) {
            _rowKeyIndexMap.put(_rowKeyIndexMap.getByValue(i), i + 1);
        }

        _rowKeyIndexMap.put(rowKey, rowIndex);

        if (N.isNullOrEmpty(row)) {
            for (int columnIndex = 0; columnIndex < columnLength; columnIndex++) {
                _columnList.get(columnIndex).add(rowIndex, null);
            }
        } else {
            final Iterator iter = row.iterator();

            for (int columnIndex = 0; columnIndex < columnLength; columnIndex++) {
                _columnList.get(columnIndex).add(rowIndex, iter.next());
            }
        }

    }

    public  void updateRow(R rowKey, Try.Function func) throws X {
        checkFrozen();

        if (columnLength() > 0) {
            this.init();

            final int rowIndex = this.getRowIndex(rowKey);

            for (List column : _columnList) {
                column.set(rowIndex, func.apply(column.get(rowIndex)));
            }
        }
    }

    public void removeRow(Object rowKey) {
        checkFrozen();

        checkRowKey(rowKey);

        _rowKeySet.remove(rowKey);

        if (_rowKeyIndexMap != null) {
            final int columnLength = columnLength();
            final int newRowSize = rowLength();
            final int removedRowIndex = _rowKeyIndexMap.remove(rowKey);

            if (removedRowIndex == newRowSize) {
                // removed last row.
            } else {
                for (int i = removedRowIndex; i < newRowSize; i++) {
                    _rowKeyIndexMap.put(_rowKeyIndexMap.getByValue(i + 1), i);
                }
            }

            if (_initialized) {
                for (int columnIndex = 0; columnIndex < columnLength; columnIndex++) {
                    _columnList.get(columnIndex).remove(removedRowIndex);
                }
            }
        }
    }

    /**
     * Move the specified row to the new position.
     * 
     * @param rowKey
     * @param newRowIndex
     */
    public void moveRow(Object rowKey, int newRowIndex) {
        checkFrozen();

        this.checkRowIndex(newRowIndex);

        final int rowIndex = this.getRowIndex(rowKey);
        final List tmp = new ArrayList<>(rowLength());
        tmp.addAll(_rowKeySet);
        tmp.add(newRowIndex, tmp.remove(rowIndex));

        _rowKeySet.clear();
        _rowKeySet.addAll(tmp);

        _rowKeyIndexMap = null;

        if (_initialized && _columnList.size() > 0) {
            for (List column : _columnList) {
                column.add(newRowIndex, column.remove(rowIndex));
            }
        }
    }

    /**
     * Swap the positions of the two specified rows.
     * 
     * @param rowKeyA
     * @param rowKeyB
     */
    public void swapRows(Object rowKeyA, Object rowKeyB) {
        checkFrozen();

        final int rowIndexA = this.getRowIndex(rowKeyA);
        final int rowIndexB = this.getRowIndex(rowKeyB);

        final List tmp = new ArrayList<>(rowLength());
        tmp.addAll(_rowKeySet);
        final R tmpRowKeyA = tmp.get(rowIndexA);
        tmp.set(rowIndexA, tmp.get(rowIndexB));
        tmp.set(rowIndexB, tmpRowKeyA);

        _rowKeySet.clear();
        _rowKeySet.addAll(tmp);

        _rowKeyIndexMap.forcePut(tmp.get(rowIndexA), rowIndexA);
        _rowKeyIndexMap.forcePut(tmp.get(rowIndexB), rowIndexB);

        if (_initialized && _columnList.size() > 0) {
            E tmpVal = null;

            for (List column : _columnList) {
                tmpVal = column.get(rowIndexA);
                column.set(rowIndexA, column.get(rowIndexB));
                column.set(rowIndexB, tmpVal);
            }
        }
    }

    public void renameRow(R rowKey, R newRowKey) {
        checkFrozen();
        checkRowKey(rowKey);

        if (this._rowKeySet.contains(newRowKey)) {
            throw new IllegalArgumentException("Invalid new row key: " + N.toString(newRowKey) + ". It's already in the row key set.");
        }

        final int rowIndex = this.getRowIndex(rowKey);
        final List tmp = new ArrayList<>(_rowKeySet);
        tmp.set(rowIndex, newRowKey);

        this._rowKeySet.clear();
        this._rowKeySet.addAll(tmp);

        if (N.notNullOrEmpty(this._rowKeyIndexMap)) {
            this._rowKeyIndexMap.put(newRowKey, _rowKeyIndexMap.remove(rowKey));
        }
    }

    public boolean containsRow(Object rowKey) {
        return _rowKeySet.contains(rowKey);
    }

    public Map row(Object rowKey) {
        final int columnLength = columnLength();
        Map rowMap = new LinkedHashMap<>(N.initHashCapacity(columnLength));

        if (_initialized) {
            final int rowIndex = getRowIndex(rowKey);
            int columnIndex = 0;

            for (C columnKey : this.columnKeySet()) {
                rowMap.put(columnKey, _columnList.get(columnIndex++).get(rowIndex));
            }
        } else {
            checkRowKey(rowKey);

            for (C columnKey : this.columnKeySet()) {
                rowMap.put(columnKey, null);
            }
        }

        return rowMap;
    }

    public Map> rowMap() {
        final Map> result = new LinkedHashMap<>(N.initHashCapacity(this.rowKeySet().size()));

        for (R rowKey : this.rowKeySet()) {
            result.put(rowKey, row(rowKey));
        }

        return result;
    }

    public List getColumn(Object columnKey) {
        final int rowLength = rowLength();
        List column = null;

        if (_initialized) {
            column = _columnList.get(getColumnIndex(columnKey));
        } else {
            checkColumnKey(columnKey);
            column = new ArrayList<>(rowLength);
            N.fill(column, 0, rowLength, null);
        }

        return ImmutableList.of(column);
    }

    public void setColumn(C columnKey, Collection column) {
        checkFrozen();

        final int rowLength = rowLength();

        if (N.notNullOrEmpty(column) && column.size() != rowLength) {
            throw new IllegalArgumentException("The size of specified column: " + column.size() + " doesn't match the length of row key set: " + rowLength);
        }

        init();

        final int columnIndex = getColumnIndex(columnKey);

        if (N.isNullOrEmpty(column)) {
            N.fill(_columnList.get(columnIndex), 0, rowLength, null);
        } else {
            _columnList.set(columnIndex, new ArrayList<>(column));
        }
    }

    public void addColumn(C columnKey, Collection column) {
        checkFrozen();

        if (_columnKeySet.contains(columnKey)) {
            throw new IllegalArgumentException("Column '" + columnKey + "' already existed");
        }

        final int rowLength = rowLength();
        final int columnLength = columnLength();

        if (N.notNullOrEmpty(column) && column.size() != rowLength) {
            throw new IllegalArgumentException("The size of specified column: " + column.size() + " doesn't match the length of row key set: " + rowLength);
        }

        init();

        _columnKeySet.add(columnKey);
        _columnKeyIndexMap.put(columnKey, columnLength);

        if (N.isNullOrEmpty(column)) {
            List newColumn = new ArrayList<>();
            N.fill(newColumn, 0, rowLength, null);
            _columnList.add(newColumn);
        } else {
            _columnList.add(new ArrayList<>(column));
        }
    }

    public void addColumn(int columnIndex, C columnKey, Collection column) {
        checkFrozen();

        final int rowLength = rowLength();
        final int columnLength = columnLength();

        if (columnIndex == columnLength) {
            addColumn(columnKey, column);
            return;
        }

        if (columnIndex < 0 || columnIndex > columnLength) {
            throw new IllegalArgumentException("Invalid column index: " + columnIndex + ". It must be: >= 0 and <= " + columnLength);
        }

        if (_columnKeySet.contains(columnKey)) {
            throw new IllegalArgumentException("Column '" + columnKey + "' already existed");
        }

        if (N.notNullOrEmpty(column) && column.size() != rowLength) {
            throw new IllegalArgumentException("The size of specified column: " + column.size() + " doesn't match the length of row key set: " + rowLength);
        }

        init();

        final List tmp = new ArrayList<>(columnLength + 1);
        tmp.addAll(_columnKeySet);
        tmp.add(columnIndex, columnKey);

        _columnKeySet.clear();
        _columnKeySet.addAll(tmp);

        for (int i = _columnKeyIndexMap.size() - 1; i >= columnIndex; i--) {
            _columnKeyIndexMap.put(_columnKeyIndexMap.getByValue(i), i + 1);
        }

        _columnKeyIndexMap.put(columnKey, columnIndex);

        if (N.isNullOrEmpty(column)) {
            List newColumn = new ArrayList<>();
            N.fill(newColumn, 0, rowLength, null);
            _columnList.add(columnIndex, newColumn);
        } else {
            _columnList.add(columnIndex, new ArrayList<>(column));
        }
    }

    public  void updateColumn(C columnKey, Try.Function func) throws X {
        checkFrozen();

        if (rowLength() > 0) {
            this.init();

            final int rowLength = rowLength();
            final List column = _columnList.get(this.getColumnIndex(columnKey));

            for (int rowIndex = 0; rowIndex < rowLength; rowIndex++) {
                column.set(rowIndex, func.apply(column.get(rowIndex)));
            }
        }
    }

    public void removeColumn(Object columnKey) {
        checkFrozen();

        checkColumnKey(columnKey);

        _columnKeySet.remove(columnKey);

        if (_columnKeyIndexMap != null) {
            final int newColumnLength = columnLength();
            final int removedColumnIndex = _columnKeyIndexMap.remove(columnKey);

            if (removedColumnIndex == newColumnLength) {
                // removed the last column
            } else {
                for (int i = removedColumnIndex; i < newColumnLength; i++) {
                    _columnKeyIndexMap.put(_columnKeyIndexMap.getByValue(i + 1), i);
                }
            }

            if (_initialized) {
                _columnList.remove(removedColumnIndex);
            }
        }
    }

    /**
     * Move the specified column to the new position.
     * 
     * @param columnKey
     * @param newColumnIndex
     */
    public void moveColumn(Object columnKey, int newColumnIndex) {
        checkFrozen();

        this.checkColumnIndex(newColumnIndex);

        final int columnIndex = this.getColumnIndex(columnKey);
        final List tmp = new ArrayList<>(columnLength());
        tmp.addAll(_columnKeySet);
        tmp.add(newColumnIndex, tmp.remove(columnIndex));

        _columnKeySet.clear();
        _columnKeySet.addAll(tmp);

        _columnKeyIndexMap = null;

        if (_initialized && _columnList.size() > 0) {
            _columnList.add(newColumnIndex, _columnList.remove(columnIndex));
        }
    }

    /**
     * Swap the positions of the two specified columns.
     * 
     * @param columnKeyA
     * @param columnKeyB
     */
    public void swapColumns(Object columnKeyA, Object columnKeyB) {
        checkFrozen();

        final int columnIndexA = this.getColumnIndex(columnKeyA);
        final int columnIndexB = this.getColumnIndex(columnKeyB);

        final List tmp = new ArrayList<>(rowLength());
        tmp.addAll(_columnKeySet);
        final C tmpColumnKeyA = tmp.get(columnIndexA);
        tmp.set(columnIndexA, tmp.get(columnIndexB));
        tmp.set(columnIndexB, tmpColumnKeyA);

        _columnKeySet.clear();
        _columnKeySet.addAll(tmp);

        _columnKeyIndexMap.forcePut(tmp.get(columnIndexA), columnIndexA);
        _columnKeyIndexMap.forcePut(tmp.get(columnIndexB), columnIndexB);

        if (_initialized && _columnList.size() > 0) {
            final List tmpColumnA = _columnList.get(columnIndexA);

            _columnList.set(columnIndexA, _columnList.get(columnIndexB));
            _columnList.set(columnIndexB, tmpColumnA);
        }
    }

    public void renameColumn(C columnKey, C newColumnKey) {
        checkFrozen();

        this.checkColumnKey(columnKey);

        if (this._columnKeySet.contains(newColumnKey)) {
            throw new IllegalArgumentException("Invalid new column key: " + N.toString(newColumnKey) + ". It's already in the column key set.");
        }

        final int columnIndex = this.getColumnIndex(columnKey);
        final List tmp = new ArrayList<>(_columnKeySet);
        tmp.set(columnIndex, newColumnKey);

        this._columnKeySet.clear();
        this._columnKeySet.addAll(tmp);

        if (N.notNullOrEmpty(this._columnKeyIndexMap)) {
            this._columnKeyIndexMap.put(newColumnKey, _columnKeyIndexMap.remove(columnKey));
        }
    }

    public boolean containsColumn(Object columnKey) {
        return _columnKeySet.contains(columnKey);
    }

    public Map column(Object columnKey) {
        final int rowLength = rowLength();
        final Map columnMap = new LinkedHashMap<>(N.initHashCapacity(rowLength));

        if (_initialized) {
            final int columnIndex = getColumnIndex(columnKey);
            final List column = _columnList.get(columnIndex);
            int rowIndex = 0;

            for (R rowKey : this.rowKeySet()) {
                columnMap.put(rowKey, column.get(rowIndex++));
            }
        } else {
            checkColumnKey(columnKey);

            for (R rowKey : this.rowKeySet()) {
                columnMap.put(rowKey, null);
            }
        }

        return columnMap;
    }

    public Map> columnMap() {
        final Map> result = new LinkedHashMap<>(N.initHashCapacity(this.columnKeySet().size()));

        for (C columnKey : this.columnKeySet()) {
            result.put(columnKey, column(columnKey));
        }

        return result;
    }

    /**
     * Returns the size of row key set.
     *
     * @return
     */
    public int rowLength() {
        return _rowKeySet.size();
    }

    /**
     * Returns the size of column key set.
     *
     * @return
     */
    public int columnLength() {
        return _columnKeySet.size();
    }

    public  void updateAll(Try.Function func) throws X {
        checkFrozen();

        if (rowLength() > 0 && columnLength() > 0) {
            this.init();

            final int rowLength = rowLength();

            for (List column : _columnList) {
                for (int rowIndex = 0; rowIndex < rowLength; rowIndex++) {
                    column.set(rowIndex, func.apply(column.get(rowIndex)));
                }
            }
        }
    }

    /**
     * Update all elements based on points
     * 
     * @param func
     */
    public  void updateAll(Try.IntBiFunction func) throws X {
        checkFrozen();

        if (rowLength() > 0 && columnLength() > 0) {
            this.init();

            final int rowLength = rowLength();
            int columnIndex = 0;

            for (List column : _columnList) {
                for (int rowIndex = 0; rowIndex < rowLength; rowIndex++) {
                    column.set(rowIndex, func.apply(rowIndex, columnIndex));
                }

                columnIndex++;
            }
        }
    }

    /**
     * Update all elements based on points
     * 
     * @param func
     */
    public  void updateAll(Try.TriFunction func) throws X {
        checkFrozen();

        if (rowLength() > 0 && columnLength() > 0) {
            this.init();

            final int rowLength = rowLength();
            int columnIndex = 0;
            C columnKey = null;

            for (List column : _columnList) {
                columnKey = _columnKeyIndexMap.getByValue(columnIndex);

                for (int rowIndex = 0; rowIndex < rowLength; rowIndex++) {
                    column.set(rowIndex, func.apply(_rowKeyIndexMap.getByValue(rowIndex), columnKey, column.get(rowIndex)));
                }

                columnIndex++;
            }
        }
    }

    /**
     * 
     * @param predicate
     * @param newValue
     */
    public  void replaceIf(final Try.Predicate predicate, final E newValue) throws X {
        checkFrozen();

        if (rowLength() > 0 && columnLength() > 0) {
            this.init();

            final int rowLength = rowLength();

            for (List column : _columnList) {
                for (int rowIndex = 0; rowIndex < rowLength; rowIndex++) {
                    if (predicate.test(column.get(rowIndex))) {
                        column.set(rowIndex, newValue);
                    }
                }
            }
        }
    }

    /**
     * Replace elements by Predicate.test(i, j) based on points
     * 
     * @param predicate
     * @param newValue
     */
    public  void replaceIf(final Try.IntBiPredicate predicate, final E newValue) throws X {
        checkFrozen();

        if (rowLength() > 0 && columnLength() > 0) {
            this.init();

            final int rowLength = rowLength();
            int columnIndex = 0;

            for (List column : _columnList) {
                for (int rowIndex = 0; rowIndex < rowLength; rowIndex++) {
                    if (predicate.test(rowIndex, columnIndex)) {
                        column.set(rowIndex, newValue);
                    }
                }

                columnIndex++;
            }
        }
    }

    /**
     * Replace elements by Predicate.test(i, j) based on points
     * 
     * @param predicate
     * @param newValue
     */
    public  void replaceIf(final Try.TriPredicate predicate, final E newValue) throws X {
        checkFrozen();

        if (rowLength() > 0 && columnLength() > 0) {
            this.init();

            final int rowLength = rowLength();
            int columnIndex = 0;
            R rowKey = null;
            C columnKey = null;
            E val = null;

            for (List column : _columnList) {
                columnKey = _columnKeyIndexMap.getByValue(columnIndex);

                for (int rowIndex = 0; rowIndex < rowLength; rowIndex++) {
                    rowKey = _rowKeyIndexMap.getByValue(rowIndex);
                    val = column.get(rowIndex);

                    if (predicate.test(rowKey, columnKey, val)) {
                        column.set(rowIndex, newValue);
                    }
                }

                columnIndex++;
            }
        }
    }

    public Sheet copy() {
        final Sheet copy = new Sheet<>(this._rowKeySet, this._columnKeySet);

        if (this._initialized) {
            copy.initIndexMap();

            copy._columnList = new ArrayList<>(_columnList.size());

            for (List column : _columnList) {
                copy._columnList.add(new ArrayList<>(column));
            }

            copy._initialized = true;
        }

        return copy;
    }

    public Sheet copy(Collection rowKeySet, Collection columnKeySet) {
        if (this._rowKeySet.containsAll(rowKeySet) == false) {
            throw new IllegalArgumentException(
                    "Row keys: " + N.difference(rowKeySet, this._rowKeySet) + " are not included in this sheet row keys: " + this._rowKeySet);
        }

        if (this._columnKeySet.containsAll(columnKeySet) == false) {
            throw new IllegalArgumentException(
                    "Column keys: " + N.difference(columnKeySet, this._columnKeySet) + " are not included in this sheet Column keys: " + this._columnKeySet);
        }

        final Sheet copy = new Sheet<>(rowKeySet, columnKeySet);

        if (this._initialized) {
            copy.initIndexMap();

            copy._columnList = new ArrayList<>(copy.columnLength());

            final int[] rowKeyIndices = new int[copy.rowLength()];
            int idx = 0;

            for (R rowKey : copy._rowKeySet) {
                rowKeyIndices[idx++] = this.getRowIndex(rowKey);
            }

            for (C columnKey : copy._columnKeySet) {
                final List column = _columnList.get(this.getColumnIndex(columnKey));
                final List newColumn = new ArrayList<>(rowKeyIndices.length);

                for (int rowIndex : rowKeyIndices) {
                    newColumn.add(column.get(rowIndex));
                }

                copy._columnList.add(newColumn);
            }

            copy._initialized = true;
        }

        return copy;
    }

    /**
     * Deeply copy each element in this Sheet by Serialization/Deserialization.
     * 
     * @return
     */
    @Override
    public Sheet clone() {
        return clone(this._isFrozen);
    }

    /**
     * Deeply copy each element in this Sheet by Serialization/Deserialization.
     * 
     * @return
     */
    public Sheet clone(boolean freeze) {
        if (kryoParser == null) {
            throw new RuntimeException("Kryo is required");
        }

        final Sheet copy = kryoParser.clone(this);

        copy._isFrozen = freeze;

        return copy;
    }

    public  Sheet merge(Sheet b,
            Try.BiFunction mergeFunction) throws X {
        final Set newRowKeySet = N.newLinkedHashSet(this.rowKeySet());
        newRowKeySet.addAll(b.rowKeySet());

        final Set newColumnKeySet = N.newLinkedHashSet(this.columnKeySet());
        newColumnKeySet.addAll(b.columnKeySet());

        final Sheet result = new Sheet<>(newRowKeySet, newColumnKeySet);
        final int[] rowIndexes1 = new int[newRowKeySet.size()], rowIndexes2 = new int[newRowKeySet.size()];
        final int[] columnIndexes1 = new int[newColumnKeySet.size()], columnIndexes2 = new int[newColumnKeySet.size()];

        int idx = 0;
        for (R rowKey : newRowKeySet) {
            rowIndexes1[idx] = this.containsRow(rowKey) ? this.getRowIndex(rowKey) : -1;
            rowIndexes2[idx] = b.containsRow(rowKey) ? b.getRowIndex(rowKey) : -1;
        }

        idx = 0;
        for (C columnKey : newColumnKeySet) {
            columnIndexes1[idx] = this.containsColumn(columnKey) ? this.getColumnIndex(columnKey) : -1;
            columnIndexes2[idx] = b.containsColumn(columnKey) ? b.getColumnIndex(columnKey) : -1;
        }

        E e1 = null;
        E2 e2 = null;

        for (int rowIndex = 0, rowLen = newRowKeySet.size(); rowIndex < rowLen; rowIndex++) {
            for (int columnIndex = 0, columnLen = newColumnKeySet.size(); columnIndex < columnLen; columnIndex++) {
                e1 = rowIndexes1[rowIndex] > -1 && columnIndexes1[columnIndex] > -1 ? this.get(rowIndexes1[rowIndex], columnIndexes1[columnIndex]) : null;
                e2 = rowIndexes2[rowIndex] > -1 && columnIndexes2[columnIndex] > -1 ? b.get(rowIndexes2[rowIndex], columnIndexes2[columnIndex]) : null;
                result.put(rowIndex, columnIndex, mergeFunction.apply(e1, e2));
            }
        }

        return result;
    }

    public Sheet transpose() {
        final Sheet copy = new Sheet<>(this._columnKeySet, this._rowKeySet);

        if (this._initialized) {
            copy.initIndexMap();

            final int rowLength = copy.rowLength();
            final int columnLength = copy.columnLength();

            copy._columnList = new ArrayList<>(columnLength);

            for (int i = 0; i < columnLength; i++) {
                final List column = new ArrayList<>(rowLength);

                for (int j = 0; j < rowLength; j++) {
                    column.add(_columnList.get(j).get(i));
                }

                copy._columnList.add(column);
            }

            copy._initialized = true;
        }

        return copy;
    }

    public void freeze() {
        _isFrozen = true;
    }

    public boolean frozen() {
        return _isFrozen;
    }

    public void clear() {
        checkFrozen();

        if (_initialized && _columnList.size() > 0) {
            for (List column : _columnList) {
                N.fill(column, 0, column.size(), null);
            }
        }
    }

    public void trimToSize() {
        if (_initialized && _columnList.size() > 0) {
            for (List column : _columnList) {
                if (column instanceof ArrayList) {
                    ((ArrayList) column).trimToSize();
                }
            }
        }
    }

    public  void forEachH(Try.TriConsumer action) throws X {
        for (R rowKey : _rowKeySet) {
            for (C columnKey : _columnKeySet) {
                if (_initialized) {
                    action.accept(rowKey, columnKey, get(rowKey, columnKey));
                } else {
                    action.accept(rowKey, columnKey, null);
                }
            }
        }
    }

    public  void forEachV(Try.TriConsumer action) throws X {
        for (C columnKey : _columnKeySet) {
            for (R rowKey : _rowKeySet) {
                if (_initialized) {
                    action.accept(rowKey, columnKey, get(rowKey, columnKey));
                } else {
                    action.accept(rowKey, columnKey, null);
                }
            }
        }
    }

    /**
     * 
     * @return a stream of Cells based on the order of row.
     */
    public Stream> cellsH() {
        return cellsH(0, rowLength());
    }

    public Stream> cellsH(final int rowIndex) {
        return cellsH(rowIndex, rowIndex + 1);
    }

    /**
     * 
     * @param fromRowIndex
     * @param toRowIndex
     * @return a stream of Cells based on the order of row.
     */
    public Stream> cellsH(final int fromRowIndex, final int toRowIndex) {
        N.checkFromToIndex(fromRowIndex, toRowIndex, rowLength());

        if (rowLength() == 0 || columnLength() == 0) {
            return Stream.empty();
        }

        final int columnLength = columnLength();

        initIndexMap();

        return Stream.of(new ObjIteratorEx>() {
            private final long toIndex = toRowIndex * columnLength * 1L;
            private long cursor = fromRowIndex * columnLength * 1L;

            @Override
            public boolean hasNext() {
                return cursor < toIndex;
            }

            @Override
            public Sheet.Cell next() {
                if (cursor >= toIndex) {
                    throw new NoSuchElementException();
                }

                final int rowIndex = (int) (cursor / columnLength);
                final int columnIndex = (int) (cursor++ % columnLength);

                return new CellImpl<>(_rowKeyIndexMap.getByValue(rowIndex), _columnKeyIndexMap.getByValue(columnIndex),
                        _initialized ? _columnList.get(columnIndex).get(rowIndex) : null);
            }

            @Override
            public void skip(long n) {
                N.checkArgNotNegative(n, "n");

                cursor = n < toIndex - cursor ? cursor + n : toIndex;
            }

            @Override
            public long count() {
                return toIndex - cursor;
            }
        });
    }

    /**
     * 
     * @return a stream of Cells based on the order of column.
     */
    public Stream> cellsV() {
        return cellsV(0, columnLength());
    }

    /**
     * 
     * @param columnIndex
     * @return
     */
    public Stream> cellsV(final int columnIndex) {
        return cellsV(columnIndex, columnIndex + 1);
    }

    /**
     * 
     * @param fromColumnIndex
     * @param toColumnIndex
     * @return a stream of Cells based on the order of column.
     */

    public Stream> cellsV(final int fromColumnIndex, final int toColumnIndex) {
        N.checkFromToIndex(fromColumnIndex, toColumnIndex, columnLength());

        if (rowLength() == 0 || columnLength() == 0) {
            return Stream.empty();
        }

        final int rowLength = rowLength();

        initIndexMap();

        return Stream.of(new ObjIteratorEx>() {
            private final long toIndex = toColumnIndex * rowLength * 1L;
            private long cursor = fromColumnIndex * rowLength * 1L;

            @Override
            public boolean hasNext() {
                return cursor < toIndex;
            }

            @Override
            public Sheet.Cell next() {
                if (cursor >= toIndex) {
                    throw new NoSuchElementException();
                }

                final int rowIndex = (int) (cursor % rowLength);
                final int columnIndex = (int) (cursor++ / rowLength);

                return new CellImpl<>(_rowKeyIndexMap.getByValue(rowIndex), _columnKeyIndexMap.getByValue(columnIndex),
                        _initialized ? _columnList.get(columnIndex).get(rowIndex) : null);
            }

            @Override
            public void skip(long n) {
                N.checkArgNotNegative(n, "n");

                cursor = n < toIndex - cursor ? cursor + n : toIndex;
            }

            @Override
            public long count() {
                return toIndex - cursor;
            }
        });
    }

    /**
     * 
     * @return a stream based on the order of row.
     */
    public Stream>> cellsR() {
        return cellsR(0, rowLength());
    }

    /**
     * 
     * @param fromRowIndex
     * @param toRowIndex
     * @return a stream based on the order of row.
     */
    public Stream>> cellsR(final int fromRowIndex, final int toRowIndex) {
        N.checkFromToIndex(fromRowIndex, toRowIndex, rowLength());

        if (rowLength() == 0 || columnLength() == 0) {
            return Stream.empty();
        }

        final int columnLength = columnLength();

        return Stream.of(new ObjIteratorEx>>() {
            private volatile int rowIndex = fromRowIndex;

            @Override
            public boolean hasNext() {
                return rowIndex < toRowIndex;
            }

            @Override
            public Stream> next() {
                if (rowIndex >= toRowIndex) {
                    throw new NoSuchElementException();
                }

                return Stream.of(new ObjIteratorEx>() {
                    private final int curRowIndex = rowIndex++;
                    private final R r = _rowKeyIndexMap.getByValue(curRowIndex);
                    private int columnIndex = 0;

                    @Override
                    public boolean hasNext() {
                        return columnIndex < columnLength;
                    }

                    @Override
                    public Cell next() {
                        if (columnIndex >= columnLength) {
                            throw new NoSuchElementException();
                        }

                        final int curColumnIndex = columnIndex++;

                        return new CellImpl<>(r, _columnKeyIndexMap.getByValue(curColumnIndex),
                                _initialized ? _columnList.get(curColumnIndex).get(curRowIndex) : null);
                    }

                    @Override
                    public void skip(long n) {
                        N.checkArgNotNegative(n, "n");

                        columnIndex = n < columnLength - columnIndex ? columnIndex + (int) n : columnLength;
                    }

                    @Override
                    public long count() {
                        return columnLength - columnIndex;
                    }
                });
            }

            @Override
            public void skip(long n) {
                N.checkArgNotNegative(n, "n");

                rowIndex = n < toRowIndex - rowIndex ? rowIndex + (int) n : toRowIndex;
            }

            @Override
            public long count() {
                return toRowIndex - rowIndex;
            }
        });
    }

    /**
     * 
     * @return a stream based on the order of column.
     */
    public Stream>> cellsC() {
        return cellsC(0, columnLength());
    }

    /**
     * 
     * @param fromColumnIndex
     * @param toColumnIndex
     * @return a stream based on the order of column.
     */
    public Stream>> cellsC(final int fromColumnIndex, final int toColumnIndex) {
        N.checkFromToIndex(fromColumnIndex, toColumnIndex, columnLength());

        if (rowLength() == 0 || columnLength() == 0) {
            return Stream.empty();
        }

        final int rowLength = rowLength();

        return Stream.of(new ObjIteratorEx>>() {
            private int columnIndex = fromColumnIndex;

            @Override
            public boolean hasNext() {
                return columnIndex < toColumnIndex;
            }

            @Override
            public Stream> next() {
                if (columnIndex >= toColumnIndex) {
                    throw new NoSuchElementException();
                }

                final int curColumnIndex = columnIndex++;
                final C c = _columnKeyIndexMap.getByValue(curColumnIndex);

                if (_initialized) {
                    final List column = _columnList.get(curColumnIndex);

                    return IntStream.range(0, rowLength).mapToObj(new IntFunction>() {
                        @Override
                        public Cell apply(int rowIndex) {
                            return new CellImpl<>(_rowKeyIndexMap.getByValue(rowIndex), c, column.get(rowIndex));
                        }
                    });
                } else {
                    return IntStream.range(0, rowLength).mapToObj(new IntFunction>() {
                        @Override
                        public Cell apply(int rowIndex) {
                            return new CellImpl<>(_rowKeyIndexMap.getByValue(rowIndex), c, null);
                        }
                    });
                }

            }

            @Override
            public void skip(long n) {
                N.checkArgNotNegative(n, "n");

                columnIndex = n < toColumnIndex - columnIndex ? columnIndex + (int) n : toColumnIndex;
            }

            @Override
            public long count() {
                return toColumnIndex - columnIndex;
            }

        });
    }

    public Stream pointsH() {
        return pointsH(0, rowLength());
    }

    public Stream pointsH(int rowIndex) {
        return pointsH(rowIndex, rowIndex + 1);
    }

    public Stream pointsH(int fromRowIndex, int toRowIndex) {
        N.checkFromToIndex(fromRowIndex, toRowIndex, rowLength());

        final int columnLength = columnLength();

        return IntStream.range(fromRowIndex, toRowIndex).flatMapToObj(new IntFunction>() {
            @Override
            public Stream apply(final int rowIndex) {
                return IntStream.range(0, columnLength).mapToObj(new IntFunction() {
                    @Override
                    public IntPair apply(final int columnIndex) {
                        return IntPair.of(rowIndex, columnIndex);
                    }
                });
            }
        });
    }

    public Stream pointsV() {
        return pointsV(0, columnLength());
    }

    public Stream pointsV(int columnIndex) {
        return pointsV(columnIndex, columnIndex + 1);
    }

    public Stream pointsV(int fromColumnIndex, int toColumnIndex) {
        N.checkFromToIndex(fromColumnIndex, toColumnIndex, columnLength());

        final int rowLength = rowLength();

        return IntStream.range(fromColumnIndex, toColumnIndex).flatMapToObj(new IntFunction>() {
            @Override
            public Stream apply(final int columnIndex) {
                return IntStream.range(0, rowLength).mapToObj(new IntFunction() {
                    @Override
                    public IntPair apply(final int rowIndex) {
                        return IntPair.of(rowIndex, columnIndex);
                    }
                });
            }
        });
    }

    public Stream> pointsR() {
        return pointsR(0, rowLength());
    }

    public Stream> pointsR(int fromRowIndex, int toRowIndex) {
        N.checkFromToIndex(fromRowIndex, toRowIndex, rowLength());

        final int columnLength = columnLength();

        return IntStream.range(fromRowIndex, toRowIndex).mapToObj(new IntFunction>() {
            @Override
            public Stream apply(final int rowIndex) {
                return IntStream.range(0, columnLength).mapToObj(new IntFunction() {
                    @Override
                    public IntPair apply(final int columnIndex) {
                        return IntPair.of(rowIndex, columnIndex);
                    }
                });
            }
        });
    }

    public Stream> pointsC() {
        return pointsR(0, columnLength());
    }

    public Stream> pointsC(int fromColumnIndex, int toColumnIndex) {
        N.checkFromToIndex(fromColumnIndex, toColumnIndex, columnLength());

        final int rowLength = rowLength();

        return IntStream.range(fromColumnIndex, toColumnIndex).mapToObj(new IntFunction>() {
            @Override
            public Stream apply(final int columnIndex) {
                return IntStream.range(0, rowLength).mapToObj(new IntFunction() {
                    @Override
                    public IntPair apply(final int rowIndex) {
                        return IntPair.of(rowIndex, columnIndex);
                    }
                });
            }
        });
    }

    /**
     * 
     * @return a stream based on the order of row.
     */
    public Stream streamH() {
        return streamH(0, rowLength());
    }

    /**
     * 
     * @param rowIndex
     * @return
     */
    public Stream streamH(final int rowIndex) {
        return streamH(rowIndex, rowIndex + 1);
    }

    /**
     * 
     * @param fromRowIndex
     * @param toRowIndex
     * @return a stream based on the order of row.
     */
    public Stream streamH(final int fromRowIndex, final int toRowIndex) {
        N.checkFromToIndex(fromRowIndex, toRowIndex, rowLength());

        if (rowLength() == 0 || columnLength() == 0) {
            return Stream.empty();
        }

        return Stream.of(new ObjIteratorEx() {
            private final int columnLength = columnLength();
            private final long toIndex = toRowIndex * columnLength * 1L;
            private long cursor = fromRowIndex * columnLength * 1L;

            @Override
            public boolean hasNext() {
                return cursor < toIndex;
            }

            @Override
            public E next() {
                if (cursor >= toIndex) {
                    throw new NoSuchElementException();
                }

                if (_initialized) {
                    return _columnList.get((int) (cursor % columnLength)).get((int) (cursor++ / columnLength));
                } else {
                    cursor++;
                    return null;
                }
            }

            @Override
            public void skip(long n) {
                N.checkArgNotNegative(n, "n");

                cursor = n < toIndex - cursor ? cursor + n : toIndex;
            }

            @Override
            public long count() {
                return toIndex - cursor;
            }
        });
    }

    /**
     * 
     * @return a stream based on the order of column.
     */
    public Stream streamV() {
        return streamV(0, columnLength());
    }

    /**
     * 
     * @param columnIndex
     * @return
     */
    public Stream streamV(final int columnIndex) {
        return streamV(columnIndex, columnIndex + 1);
    }

    /**
     * 
     * @param fromColumnIndex
     * @param toColumnIndex
     * @return a stream based on the order of column.
     */
    public Stream streamV(final int fromColumnIndex, final int toColumnIndex) {
        N.checkFromToIndex(fromColumnIndex, toColumnIndex, columnLength());

        if (rowLength() == 0 || columnLength() == 0) {
            return Stream.empty();
        }

        return Stream.of(new ObjIteratorEx() {
            private final int rowLength = rowLength();
            private final long toIndex = toColumnIndex * rowLength * 1L;
            private long cursor = fromColumnIndex * rowLength * 1L;

            @Override
            public boolean hasNext() {
                return cursor < toIndex;
            }

            @Override
            public E next() {
                if (cursor >= toIndex) {
                    throw new NoSuchElementException();
                }

                if (_initialized) {
                    return _columnList.get((int) (cursor / rowLength)).get((int) (cursor++ % rowLength));
                } else {
                    cursor++;
                    return null;
                }
            }

            @Override
            public void skip(long n) {
                N.checkArgNotNegative(n, "n");

                cursor = n < toIndex - cursor ? cursor + n : toIndex;
            }

            @Override
            public long count() {
                return toIndex - cursor;
            }
        });
    }

    /**
     * 
     * @return a stream based on the order of row.
     */
    public Stream> streamR() {
        return streamR(0, rowLength());
    }

    /**
     * 
     * @param fromRowIndex
     * @param toRowIndex
     * @return a stream based on the order of row.
     */
    public Stream> streamR(final int fromRowIndex, final int toRowIndex) {
        N.checkFromToIndex(fromRowIndex, toRowIndex, rowLength());

        if (rowLength() == 0 || columnLength() == 0) {
            return Stream.empty();
        }

        return Stream.of(new ObjIteratorEx>() {
            private final int toIndex = toRowIndex;
            private volatile int cursor = fromRowIndex;

            @Override
            public boolean hasNext() {
                return cursor < toIndex;
            }

            @Override
            public Stream next() {
                if (cursor >= toIndex) {
                    throw new NoSuchElementException();
                }

                return Stream.of(new ObjIteratorEx() {
                    private final int rowIndex = cursor++;
                    private final int toIndex2 = columnLength();
                    private int cursor2 = 0;

                    @Override
                    public boolean hasNext() {
                        return cursor2 < toIndex2;
                    }

                    @Override
                    public E next() {
                        if (cursor2 >= toIndex2) {
                            throw new NoSuchElementException();
                        }

                        if (_initialized) {
                            return _columnList.get(cursor2++).get(rowIndex);
                        } else {
                            cursor2++;
                            return null;
                        }
                    }

                    @Override
                    public void skip(long n) {
                        N.checkArgNotNegative(n, "n");

                        cursor2 = n < toIndex2 - cursor2 ? cursor2 + (int) n : toIndex2;
                    }

                    @Override
                    public long count() {
                        return toIndex2 - cursor2;
                    }
                });
            }

            @Override
            public void skip(long n) {
                N.checkArgNotNegative(n, "n");

                cursor = n < toIndex - cursor ? cursor + (int) n : toIndex;
            }

            @Override
            public long count() {
                return toIndex - cursor;
            }
        });
    }

    /**
     * 
     * @return a stream based on the order of column.
     */
    public Stream> streamC() {
        return streamC(0, columnLength());
    }

    /**
     * 
     * @param fromColumnIndex
     * @param toColumnIndex
     * @return a stream based on the order of column.
     */
    public Stream> streamC(final int fromColumnIndex, final int toColumnIndex) {
        N.checkFromToIndex(fromColumnIndex, toColumnIndex, columnLength());

        if (rowLength() == 0 || columnLength() == 0) {
            return Stream.empty();
        }

        return Stream.of(new ObjIteratorEx>() {
            private final int toIndex = toColumnIndex;
            private int cursor = fromColumnIndex;

            @Override
            public boolean hasNext() {
                return cursor < toIndex;
            }

            @Override
            public Stream next() {
                if (cursor >= toIndex) {
                    throw new NoSuchElementException();
                }

                if (_initialized) {
                    return Stream.of(_columnList.get(cursor++));
                } else {
                    cursor++;
                    return Stream.repeat(null, rowLength());
                }
            }

            @Override
            public void skip(long n) {
                N.checkArgNotNegative(n, "n");

                cursor = n < toIndex - cursor ? cursor + (int) n : toIndex;
            }

            @Override
            public long count() {
                return toIndex - cursor;
            }
        });
    }

    /**
     * 
     * @return a DataSet based on row.
     */
    public DataSet toDataSetH() {
        final int rowLength = rowLength();
        final int columnLength = columnLength();
        final List dataSetColumnNameList = new ArrayList<>(columnLength);

        for (C columnKey : _columnKeySet) {
            dataSetColumnNameList.add(N.toString(columnKey));
        }

        final List> dataSetColumnList = new ArrayList<>(columnLength);

        if (_initialized) {
            for (List column : _columnList) {
                dataSetColumnList.add(new ArrayList(column));
            }
        } else {
            for (int i = 0; i < columnLength; i++) {
                List column = new ArrayList<>(rowLength);
                N.fill(column, 0, rowLength, null);
                dataSetColumnList.add(column);
            }
        }

        return new RowDataSet(dataSetColumnNameList, dataSetColumnList);
    }

    /**
     * 
     * @return a DataSet based on column.
     */
    public DataSet toDataSetV() {
        final int rowLength = rowLength();
        final int columnLength = columnLength();
        final List dataSetColumnNameList = new ArrayList<>(rowLength);

        for (R rowKey : _rowKeySet) {
            dataSetColumnNameList.add(N.toString(rowKey));
        }

        final List> dataSetColumnList = new ArrayList<>(rowLength);

        if (_initialized) {
            for (int i = 0; i < rowLength; i++) {
                final List column = new ArrayList<>(columnLength);

                for (int j = 0; j < columnLength; j++) {
                    column.add(_columnList.get(j).get(i));
                }

                dataSetColumnList.add(column);
            }
        } else {
            for (int i = 0; i < rowLength; i++) {
                List column = new ArrayList<>(columnLength);
                N.fill(column, 0, columnLength, null);
                dataSetColumnList.add(column);
            }
        }

        return new RowDataSet(dataSetColumnNameList, dataSetColumnList);
    }

    /**
     * 
     * @param cls
     * @return a Matrix based on row.
     */
    public Matrix toMatrixH(Class cls) {
        final int rowLength = rowLength();
        final int columnLength = columnLength();
        final E[][] c = N.newArray(N.newArray(cls, 0).getClass(), rowLength);

        for (int i = 0; i < rowLength; i++) {
            c[i] = N.newArray(cls, columnLength);
        }

        if (rowLength == 0 || columnLength == 0 || _initialized == false) {
            return new Matrix<>(c);
        }

        for (int i = 0; i < columnLength; i++) {
            final List column = _columnList.get(i);

            for (int j = 0; j < rowLength; j++) {
                c[j][i] = column.get(j);
            }
        }

        return new Matrix<>(c);
    }

    /**
     * 
     * @param cls
     * @return a Matrix based on column.
     */
    public Matrix toMatrixV(Class cls) {
        final int rowLength = rowLength();
        final int columnLength = columnLength();
        final E[][] c = N.newArray(N.newArray(cls, 0).getClass(), columnLength);

        for (int i = 0; i < columnLength; i++) {
            c[i] = N.newArray(cls, rowLength);
        }

        if (rowLength == 0 || columnLength == 0 || _initialized == false) {
            return new Matrix<>(c);
        }

        for (int i = 0; i < columnLength; i++) {
            final List column = _columnList.get(i);

            for (int j = 0; j < rowLength; j++) {
                c[i][j] = column.get(j);
            }
        }

        return new Matrix<>(c);
    }

    /**
     * 
     * @return a 2D array based on row.
     */
    public Object[][] toArrayH() {
        final int rowLength = rowLength();
        final int columnLength = columnLength();
        final Object[][] copy = new Object[rowLength][columnLength];

        if (_initialized) {
            for (int i = 0; i < columnLength; i++) {
                final List column = _columnList.get(i);

                for (int j = 0; j < rowLength; j++) {
                    copy[j][i] = column.get(j);
                }
            }
        }

        return copy;
    }

    /**
     * 
     * @return a 2D array based on row.
     */
    public  T[][] toArrayH(Class cls) {
        final int rowLength = rowLength();
        final int columnLength = columnLength();
        final T[][] copy = N.newArray(N.newArray(cls, 0).getClass(), rowLength);

        for (int i = 0; i < rowLength; i++) {
            copy[i] = N.newArray(cls, columnLength);
        }

        if (_initialized) {
            for (int i = 0; i < columnLength; i++) {
                final List column = _columnList.get(i);

                for (int j = 0; j < rowLength; j++) {
                    copy[j][i] = (T) column.get(j);
                }
            }
        }

        return copy;
    }

    /**
     * 
     * @return a 2D array based on column.
     */
    public Object[][] toArrayV() {
        final int rowLength = rowLength();
        final int columnLength = columnLength();
        final Object[][] copy = new Object[columnLength][rowLength];

        if (_initialized) {
            for (int i = 0; i < columnLength; i++) {
                final List column = _columnList.get(i);

                for (int j = 0; j < rowLength; j++) {
                    copy[i][j] = column.get(j);
                }
            }
        }

        return copy;
    }

    /**
     * 
     * @return a 2D array based on column.
     */
    public  T[][] toArrayV(Class cls) {
        final int rowLength = rowLength();
        final int columnLength = columnLength();
        final T[][] copy = N.newArray(N.newArray(cls, 0).getClass(), columnLength);

        for (int i = 0; i < columnLength; i++) {
            copy[i] = N.newArray(cls, rowLength);
        }

        if (_initialized) {
            for (int i = 0; i < columnLength; i++) {
                final List column = _columnList.get(i);

                for (int j = 0; j < rowLength; j++) {
                    copy[i][j] = (T) column.get(j);
                }
            }
        }

        return copy;
    }

    public  T apply(Try.Function, T, X> func) throws X {
        return func.apply(this);
    }

    public  void accept(Try.Consumer, X> action) throws X {
        action.accept(this);
    }

    public void println() throws UncheckedIOException {
        println(this._rowKeySet, this._columnKeySet);
    }

    public void println(final Collection rowKeySet, final Collection columnKeySet) throws UncheckedIOException {
        println(rowKeySet, columnKeySet, new OutputStreamWriter(System.out));
    }

    public void println(final Writer outputWriter) throws UncheckedIOException {
        println(this._rowKeySet, this._columnKeySet, outputWriter);
    }

    public void println(final Collection rowKeySet, final Collection columnKeySet, final Writer outputWriter) throws UncheckedIOException {
        if (N.notNullOrEmpty(rowKeySet) && this._rowKeySet.containsAll(rowKeySet) == false) {
            throw new IllegalArgumentException(
                    "Row keys: " + N.difference(rowKeySet, this._rowKeySet) + " are not included in this sheet row keys: " + this._rowKeySet);
        }

        if (N.notNullOrEmpty(columnKeySet) && this._columnKeySet.containsAll(columnKeySet) == false) {
            throw new IllegalArgumentException(
                    "Column keys: " + N.difference(columnKeySet, this._columnKeySet) + " are not included in this sheet Column keys: " + this._columnKeySet);
        }

        N.checkArgNotNull(outputWriter, "outputWriter");

        boolean isBufferedWriter = outputWriter instanceof BufferedWriter || outputWriter instanceof java.io.BufferedWriter;
        final Writer bw = isBufferedWriter ? outputWriter : Objectory.createBufferedWriter(outputWriter);

        try {
            if (N.isNullOrEmpty(rowKeySet) && N.isNullOrEmpty(columnKeySet)) {
                bw.write(" - ");
                bw.write(IOUtil.LINE_SEPARATOR);
                bw.write("| |");
                bw.write(IOUtil.LINE_SEPARATOR);
                bw.write(" - ");
            } else {
                final int rowLen = rowKeySet.size();
                final int columnLen = columnKeySet.size() + 1;

                final int[] rowIndices = new int[rowLen];
                int idx = 0;

                for (R rowKey : rowKeySet) {
                    rowIndices[idx++] = getRowIndex(rowKey);
                }

                final int[] columnIndices = new int[columnLen];
                idx = 0;
                columnIndices[idx++] = -1; // rowKey Column

                for (C columnKey : columnKeySet) {
                    columnIndices[idx++] = getColumnIndex(columnKey);
                }

                final List columnNameList = new ArrayList<>(columnLen);
                columnNameList.add(""); // add for row key column

                for (C ck : columnKeySet) {
                    columnNameList.add(N.toString(ck));
                }

                final List> strColumnList = new ArrayList<>(columnLen);
                final int[] maxColumnLens = new int[columnLen];

                for (int i = 0; i < columnLen; i++) {
                    final List strColumn = new ArrayList<>(rowLen);
                    int maxLen = N.len(columnNameList.get(i));
                    String str = null;

                    if (i == 0) {
                        for (R rk : rowKeySet) {
                            str = N.toString(rk);
                            maxLen = N.max(maxLen, N.len(str));
                            strColumn.add(str);
                        }
                    } else if (_initialized == false) {
                        maxLen = N.max(maxLen, 4);
                        N.fill(strColumn, 0, rowLen, "null");
                    } else {
                        for (int rowIndex : rowIndices) {
                            str = N.toString(_columnList.get(columnIndices[i]).get(rowIndex));
                            maxLen = N.max(maxLen, N.len(str));
                            strColumn.add(str);
                        }
                    }

                    maxColumnLens[i] = maxLen;
                    strColumnList.add(strColumn);
                }

                final char hch = '-';
                final char hchDelta = 3;
                for (int i = 0; i < columnLen; i++) {
                    if (i == 0) {
                        bw.write(StringUtil.repeat(' ', maxColumnLens[i] + hchDelta) + "-");
                    } else {
                        bw.write(StringUtil.repeat(hch, maxColumnLens[i] + hchDelta));
                    }
                }

                bw.write(IOUtil.LINE_SEPARATOR);

                for (int i = 0; i < columnLen; i++) {
                    if (i == 0) {
                        bw.write("  ");
                    } else {
                        bw.write(" | ");
                    }

                    bw.write(StringUtil.padEnd(columnNameList.get(i), maxColumnLens[i]));
                }

                bw.write(" |");

                bw.write(IOUtil.LINE_SEPARATOR);

                for (int i = 0; i < columnLen; i++) {
                    if (i == 0) {
                        bw.write(hch);
                    }

                    bw.write(StringUtil.repeat(hch, maxColumnLens[i] + hchDelta));
                }

                for (int j = 0; j < rowLen; j++) {
                    bw.write(IOUtil.LINE_SEPARATOR);

                    for (int i = 0; i < columnLen; i++) {
                        if (i == 0) {
                            bw.write("| ");
                        } else {
                            bw.write(" | ");
                        }

                        bw.write(StringUtil.padEnd(strColumnList.get(i).get(j), maxColumnLens[i]));
                    }

                    bw.write(" |");
                }

                if (rowLen == 0) {
                    bw.write(IOUtil.LINE_SEPARATOR);

                    for (int i = 0; i < columnLen; i++) {
                        if (i == 0) {
                            bw.write("| ");
                            bw.write(StringUtil.padEnd("", maxColumnLens[i]));
                        } else {
                            bw.write(StringUtil.padEnd("", maxColumnLens[i] + 3));
                        }
                    }

                    bw.write(" |");
                }

                bw.write(IOUtil.LINE_SEPARATOR);

                for (int i = 0; i < columnLen; i++) {
                    if (i == 0) {
                        bw.write(hch);
                    }

                    bw.write(StringUtil.repeat(hch, maxColumnLens[i] + hchDelta));
                }
            }

            bw.write(IOUtil.LINE_SEPARATOR);

            bw.flush();
        } catch (IOException e) {
            throw new UncheckedIOException(e);
        } finally {
            if (!isBufferedWriter) {
                Objectory.recycle((BufferedWriter) bw);
            }
        }
    }

    @Override
    public int hashCode() {
        final int prime = 31;
        int result = 1;
        result = prime * result + ((_rowKeySet == null) ? 0 : _rowKeySet.hashCode());
        result = prime * result + ((_columnKeySet == null) ? 0 : _columnKeySet.hashCode());
        result = prime * result + (_initialized ? _columnList.hashCode() : 0);
        return result;
    }

    @Override
    public boolean equals(Object obj) {
        if (this == obj) {
            return true;
        }

        if (obj instanceof Sheet) {
            Sheet other = (Sheet) obj;

            return N.equals(other._rowKeySet, _rowKeySet) && N.equals(other._columnKeySet, _columnKeySet) && N.deepEquals(other._columnList, _columnList);
        }

        return false;
    }

    @Override
    public String toString() {
        final StringBuilder sb = Objectory.createStringBuilder();

        sb.append("{rowKeySet=");
        sb.append(_rowKeySet);
        sb.append(", columnKeySet=");
        sb.append(_columnKeySet);
        sb.append(", rowList=");
        sb.append("[");

        if (_initialized) {
            for (int i = 0, rowLength = rowLength(), columnLength = columnLength(); i < rowLength; i++) {
                if (i > 0) {
                    sb.append(N.ELEMENT_SEPARATOR_CHAR_ARRAY);
                }

                sb.append("[");

                for (int j = 0; j < columnLength; j++) {
                    if (j > 0) {
                        sb.append(N.ELEMENT_SEPARATOR_CHAR_ARRAY);
                    }

                    sb.append(N.toString(_columnList.get(j).get(i)));
                }

                sb.append("]");
            }
        }

        sb.append("]");
        sb.append("}");

        String str = sb.toString();

        Objectory.recycle(sb);

        return str;
    }

    private void init() {
        if (!_initialized) {
            initIndexMap();

            final int rowLength = rowLength();
            final int columnLength = columnLength();
            _columnList = new ArrayList<>(columnLength);

            for (int i = 0; i < columnLength; i++) {
                final List column = new ArrayList<>(rowLength);
                N.fill(column, 0, rowLength, null);
                _columnList.add(column);
            }

            _initialized = true;
        }
    }

    private void initIndexMap() {
        if (_rowKeyIndexMap == null || _columnKeyIndexMap == null) {
            final int rowLength = rowLength();
            _rowKeyIndexMap = new BiMap<>(N.initHashCapacity(rowLength));
            int index = 0;
            for (R rowKey : _rowKeySet) {
                _rowKeyIndexMap.put(rowKey, index++);
            }

            final int columnLength = columnLength();
            _columnKeyIndexMap = new BiMap<>(N.initHashCapacity(columnLength));
            index = 0;
            for (C columnKey : _columnKeySet) {
                _columnKeyIndexMap.put(columnKey, index++);
            }
        }
    }

    private void checkRowKey(Object rowKey) {
        if (!_rowKeySet.contains(rowKey)) {
            throw new IllegalArgumentException("No row found by key: " + rowKey);
        }
    }

    private void checkColumnKey(Object columnKey) {
        if (!_columnKeySet.contains(columnKey)) {
            throw new IllegalArgumentException("No column found by key: " + columnKey);
        }
    }

    private void checkRowIndex(int rowIndex) {
        if (rowIndex < 0 || rowIndex >= rowLength()) {
            throw new IndexOutOfBoundsException("Row index: " + rowIndex + " can't be negative or equals to or bigger than the row size: " + rowLength());
        }
    }

    private void checkColumnIndex(int columnIndex) {
        if (columnIndex < 0 || columnIndex >= columnLength()) {
            throw new IndexOutOfBoundsException(
                    "Column index: " + columnIndex + " can't be negative or equals to or bigger than the column size: " + columnLength());
        }
    }

    private int getRowIndex(Object rowKey) {
        if (_rowKeyIndexMap == null) {
            this.initIndexMap();
        }

        Integer index = _rowKeyIndexMap.get(rowKey);

        if (index == null) {
            throw new IllegalArgumentException("No row found by key: " + rowKey);
        }

        return index;
    }

    private int getColumnIndex(Object columnKey) {
        if (_columnKeyIndexMap == null) {
            this.initIndexMap();
        }

        Integer index = _columnKeyIndexMap.get(columnKey);

        if (index == null) {
            throw new IllegalArgumentException("No column found by key: " + columnKey);
        }

        return index;
    }

    private void checkFrozen() {
        if (_isFrozen) {
            throw new IllegalStateException("This DataSet is frozen, can't modify it.");
        }
    }

    static class CellImpl implements Sheet.Cell {
        private final R rowKey;
        private final C columnKey;
        private final E value;

        public CellImpl(R rowKey, C columnKey, E value) {
            this.rowKey = rowKey;
            this.columnKey = columnKey;
            this.value = value;
        }

        @Override
        public R rowKey() {
            return rowKey;
        }

        @Override
        public C columnKey() {
            return columnKey;
        }

        @Override
        public E value() {
            return value;
        }

        @Override
        public int hashCode() {
            int result = N.hashCode(rowKey);
            result = result * 31 + N.hashCode(columnKey);
            result = result * 31 + N.hashCode(value);
            return result;
        }

        @Override
        public boolean equals(Object obj) {
            if (this == obj) {
                return true;
            }

            if (obj instanceof CellImpl) {
                final CellImpl other = (CellImpl) obj;

                return N.equals(rowKey, other.rowKey) && N.equals(columnKey, other.columnKey) && N.equals(value, other.value);
            }

            return false;
        }

        @Override
        public String toString() {
            return StringUtil.concat("[", N.toString(rowKey), ", ", N.toString(columnKey), "]=", N.toString(value));
        }
    }

    public static interface Cell {
        R rowKey();

        C columnKey();

        E value();
    }
}
 
    

    





    




    

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