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/*
* Copyright (C) 2009 The Guava Authors
*
* 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.google.common.collect;
import static java.util.Objects.requireNonNull;
import com.google.common.annotations.GwtCompatible;
import com.google.common.collect.ImmutableMap.IteratorBasedImmutableMap;
import com.google.errorprone.annotations.Immutable;
import com.google.j2objc.annotations.WeakOuter;
import java.util.Map;
import javax.annotation.CheckForNull;
import org.checkerframework.checker.nullness.qual.Nullable;
/** A {@code RegularImmutableTable} optimized for dense data. */
@GwtCompatible
@Immutable(containerOf = {"R", "C", "V"})
@ElementTypesAreNonnullByDefault
final class DenseImmutableTable extends RegularImmutableTable {
private final ImmutableMap rowKeyToIndex;
private final ImmutableMap columnKeyToIndex;
private final ImmutableMap> rowMap;
private final ImmutableMap> columnMap;
@SuppressWarnings("Immutable") // We don't modify this after construction.
private final int[] rowCounts;
@SuppressWarnings("Immutable") // We don't modify this after construction.
private final int[] columnCounts;
@SuppressWarnings("Immutable") // We don't modify this after construction.
private final @Nullable V[][] values;
// For each cell in iteration order, the index of that cell's row key in the row key list.
@SuppressWarnings("Immutable") // We don't modify this after construction.
private final int[] cellRowIndices;
// For each cell in iteration order, the index of that cell's column key in the column key list.
@SuppressWarnings("Immutable") // We don't modify this after construction.
private final int[] cellColumnIndices;
DenseImmutableTable(
ImmutableList> cellList,
ImmutableSet rowSpace,
ImmutableSet columnSpace) {
@SuppressWarnings("unchecked")
@Nullable
V[][] array = (@Nullable V[][]) new Object[rowSpace.size()][columnSpace.size()];
this.values = array;
this.rowKeyToIndex = Maps.indexMap(rowSpace);
this.columnKeyToIndex = Maps.indexMap(columnSpace);
rowCounts = new int[rowKeyToIndex.size()];
columnCounts = new int[columnKeyToIndex.size()];
int[] cellRowIndices = new int[cellList.size()];
int[] cellColumnIndices = new int[cellList.size()];
for (int i = 0; i < cellList.size(); i++) {
Cell cell = cellList.get(i);
R rowKey = cell.getRowKey();
C columnKey = cell.getColumnKey();
// The requireNonNull calls are safe because we construct the indexes with indexMap.
int rowIndex = requireNonNull(rowKeyToIndex.get(rowKey));
int columnIndex = requireNonNull(columnKeyToIndex.get(columnKey));
V existingValue = values[rowIndex][columnIndex];
checkNoDuplicate(rowKey, columnKey, existingValue, cell.getValue());
values[rowIndex][columnIndex] = cell.getValue();
rowCounts[rowIndex]++;
columnCounts[columnIndex]++;
cellRowIndices[i] = rowIndex;
cellColumnIndices[i] = columnIndex;
}
this.cellRowIndices = cellRowIndices;
this.cellColumnIndices = cellColumnIndices;
this.rowMap = new RowMap();
this.columnMap = new ColumnMap();
}
/** An immutable map implementation backed by an indexed nullable array. */
private abstract static class ImmutableArrayMap extends IteratorBasedImmutableMap {
private final int size;
ImmutableArrayMap(int size) {
this.size = size;
}
abstract ImmutableMap keyToIndex();
// True if getValue never returns null.
private boolean isFull() {
return size == keyToIndex().size();
}
K getKey(int index) {
return keyToIndex().keySet().asList().get(index);
}
@CheckForNull
abstract V getValue(int keyIndex);
@Override
ImmutableSet createKeySet() {
return isFull() ? keyToIndex().keySet() : super.createKeySet();
}
@Override
public int size() {
return size;
}
@Override
@CheckForNull
public V get(@CheckForNull Object key) {
Integer keyIndex = keyToIndex().get(key);
return (keyIndex == null) ? null : getValue(keyIndex);
}
@Override
UnmodifiableIterator> entryIterator() {
return new AbstractIterator>() {
private int index = -1;
private final int maxIndex = keyToIndex().size();
@Override
@CheckForNull
protected Entry computeNext() {
for (index++; index < maxIndex; index++) {
V value = getValue(index);
if (value != null) {
return Maps.immutableEntry(getKey(index), value);
}
}
return endOfData();
}
};
}
}
private final class Row extends ImmutableArrayMap {
private final int rowIndex;
Row(int rowIndex) {
super(rowCounts[rowIndex]);
this.rowIndex = rowIndex;
}
@Override
ImmutableMap keyToIndex() {
return columnKeyToIndex;
}
@Override
@CheckForNull
V getValue(int keyIndex) {
return values[rowIndex][keyIndex];
}
@Override
boolean isPartialView() {
return true;
}
}
private final class Column extends ImmutableArrayMap {
private final int columnIndex;
Column(int columnIndex) {
super(columnCounts[columnIndex]);
this.columnIndex = columnIndex;
}
@Override
ImmutableMap keyToIndex() {
return rowKeyToIndex;
}
@Override
@CheckForNull
V getValue(int keyIndex) {
return values[keyIndex][columnIndex];
}
@Override
boolean isPartialView() {
return true;
}
}
@WeakOuter
private final class RowMap extends ImmutableArrayMap> {
private RowMap() {
super(rowCounts.length);
}
@Override
ImmutableMap keyToIndex() {
return rowKeyToIndex;
}
@Override
ImmutableMap getValue(int keyIndex) {
return new Row(keyIndex);
}
@Override
boolean isPartialView() {
return false;
}
}
@WeakOuter
private final class ColumnMap extends ImmutableArrayMap> {
private ColumnMap() {
super(columnCounts.length);
}
@Override
ImmutableMap keyToIndex() {
return columnKeyToIndex;
}
@Override
ImmutableMap getValue(int keyIndex) {
return new Column(keyIndex);
}
@Override
boolean isPartialView() {
return false;
}
}
@Override
public ImmutableMap> columnMap() {
// Casts without copying.
ImmutableMap> columnMap = this.columnMap;
return ImmutableMap.>copyOf(columnMap);
}
@Override
public ImmutableMap> rowMap() {
// Casts without copying.
ImmutableMap> rowMap = this.rowMap;
return ImmutableMap.>copyOf(rowMap);
}
@Override
@CheckForNull
public V get(@CheckForNull Object rowKey, @CheckForNull Object columnKey) {
Integer rowIndex = rowKeyToIndex.get(rowKey);
Integer columnIndex = columnKeyToIndex.get(columnKey);
return ((rowIndex == null) || (columnIndex == null)) ? null : values[rowIndex][columnIndex];
}
@Override
public int size() {
return cellRowIndices.length;
}
@Override
Cell getCell(int index) {
int rowIndex = cellRowIndices[index];
int columnIndex = cellColumnIndices[index];
R rowKey = rowKeySet().asList().get(rowIndex);
C columnKey = columnKeySet().asList().get(columnIndex);
// requireNonNull is safe because we use indexes that were populated by the constructor.
V value = requireNonNull(values[rowIndex][columnIndex]);
return cellOf(rowKey, columnKey, value);
}
@Override
V getValue(int index) {
// requireNonNull is safe because we use indexes that were populated by the constructor.
return requireNonNull(values[cellRowIndices[index]][cellColumnIndices[index]]);
}
@Override
SerializedForm createSerializedForm() {
return SerializedForm.create(this, cellRowIndices, cellColumnIndices);
}
}