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ModeShape implementation of the JCR API
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/*
 * ModeShape (http://www.modeshape.org)
 *
 * 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 org.modeshape.jcr.query.validate;

import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collection;
import java.util.Collections;
import java.util.HashMap;
import java.util.HashSet;
import java.util.LinkedList;
import java.util.List;
import java.util.Map;
import java.util.Set;
import org.modeshape.common.annotation.Immutable;
import org.modeshape.jcr.query.model.SelectorName;
import org.modeshape.jcr.query.validate.Schemata.Column;
import org.modeshape.jcr.query.validate.Schemata.Key;
import org.modeshape.jcr.query.validate.Schemata.Table;

@Immutable
class ImmutableTable implements Table {
    private final SelectorName name;
    private final Map columnsByName;
    private final List columns;
    private final Set keys;
    private final boolean extraColumns;
    private final List selectStarColumns;
    private final Map selectStarColumnsByName;

    protected ImmutableTable( SelectorName name,
                              Iterable columns,
                              boolean extraColumns ) {
        this(name, columns, extraColumns, (Iterable[])null);
    }

    protected ImmutableTable( SelectorName name,
                              Iterable columns,
                              boolean extraColumns,
                              @SuppressWarnings( "unchecked" ) Iterable... keyColumns ) {
        this.name = name;
        // Define the columns ...
        List columnList = new ArrayList();
        Map columnMap = new HashMap();
        for (Column column : columns) {
            Column old = columnMap.put(column.getName(), column);
            if (old != null) {
                columnList.set(columnList.indexOf(old), column);
            } else {
                columnList.add(column);
            }
        }
        this.columnsByName = Collections.unmodifiableMap(columnMap);
        this.columns = Collections.unmodifiableList(columnList);
        // Define the keys ...
        if (keyColumns != null) {
            Set keys = new HashSet();
            for (Iterable keyColumnSet : keyColumns) {
                if (keyColumnSet != null) {
                    Key key = new ImmutableKey(keyColumnSet);
                    keys.add(key);
                }
            }
            this.keys = Collections.unmodifiableSet(keys);
        } else {
            this.keys = Collections.emptySet();
        }
        this.extraColumns = extraColumns;
        this.selectStarColumns = this.columns;
        this.selectStarColumnsByName = this.columnsByName;
    }

    protected ImmutableTable( SelectorName name,
                              Map columnsByName,
                              List columns,
                              Set keys,
                              boolean extraColumns,
                              Map selectStarColumnsByName,
                              List selectStarColumns ) {
        this.name = name;
        this.columns = columns;
        this.columnsByName = columnsByName;
        this.keys = keys;
        this.extraColumns = extraColumns;
        assert selectStarColumns != null;
        assert selectStarColumnsByName != null;
        assert selectStarColumns.size() == selectStarColumnsByName.size();
        this.selectStarColumns = selectStarColumns;
        this.selectStarColumnsByName = selectStarColumnsByName;
    }

    @Override
    public SelectorName getName() {
        return name;
    }

    @Override
    public Column getColumn( String name ) {
        return columnsByName.get(name);
    }

    @Override
    public List getColumns() {
        return columns;
    }

    @Override
    public List getSelectAllColumns() {
        return selectStarColumns;
    }

    @Override
    public Map getSelectAllColumnsByName() {
        return selectStarColumnsByName;
    }

    @Override
    public Map getColumnsByName() {
        return columnsByName;
    }

    @Override
    public Collection getKeys() {
        return keys;
    }

    protected Set getKeySet() {
        return keys;
    }

    @Override
    public Key getKey( Column... columns ) {
        for (Key key : keys) {
            if (key.hasColumns(columns)) return key;
        }
        return null;
    }

    @Override
    public Key getKey( Iterable columns ) {
        for (Key key : keys) {
            if (key.hasColumns(columns)) return key;
        }
        return null;
    }

    @Override
    public boolean hasKey( Column... columns ) {
        return getKey(columns) != null;
    }

    @Override
    public boolean hasKey( Iterable columns ) {
        return getKey(columns) != null;
    }

    @Override
    public boolean hasExtraColumns() {
        return extraColumns;
    }

    public ImmutableTable withColumns( Iterable columns ) {
        // Add to the list and map ...
        List newColumns = new LinkedList(this.getColumns());
        List selectStarColumns = new LinkedList(this.selectStarColumns);
        Map selectStarColumnMap = new HashMap(this.selectStarColumnsByName);
        Map columnMap = new HashMap(columnsByName);
        for (Column column : columns) {
            Column newColumn = new ImmutableColumn(column.getName(), column.getPropertyTypeName(), column.getRequiredType(),
                                                   column.isFullTextSearchable(), column.isOrderable(), column.getMinimum(),
                                                   column.getMaximum(), column.getOperators());
            newColumns.add(newColumn);
            Column existing = columnMap.put(newColumn.getName(), newColumn);
            if (existing != null) {
                newColumns.remove(existing);
                if (selectStarColumnMap.containsKey(existing.getName())) {
                    // The old column was in the SELECT * list, so the new one should be, too...
                    selectStarColumnMap.put(newColumn.getName(), newColumn);
                    selectStarColumns.add(newColumn);
                }
            }
        }
        return new ImmutableTable(getName(), columnMap, newColumns, keys, extraColumns, selectStarColumnMap, selectStarColumns);
    }

    public ImmutableTable with( SelectorName name ) {
        return new ImmutableTable(name, columnsByName, columns, keys, extraColumns, selectStarColumnsByName, selectStarColumns);
    }

    public ImmutableTable withKey( Iterable keyColumns ) {
        Set keys = new HashSet(this.keys);
        for (Column keyColumn : keyColumns) {
            assert columns.contains(keyColumn);
        }
        if (!keys.add(new ImmutableKey(keyColumns))) return this;
        return new ImmutableTable(name, columnsByName, columns, keys, extraColumns, selectStarColumnsByName, selectStarColumns);
    }

    public ImmutableTable withKey( Column... keyColumns ) {
        return withKey(Arrays.asList(keyColumns));
    }

    public ImmutableTable withExtraColumns() {
        return extraColumns ? this : new ImmutableTable(name, columnsByName, columns, keys, true, selectStarColumnsByName,
                                                        selectStarColumns);
    }

    public ImmutableTable withoutExtraColumns() {
        return !extraColumns ? this : new ImmutableTable(name, columnsByName, columns, keys, false, selectStarColumnsByName,
                                                         selectStarColumns);
    }

    public ImmutableTable withColumnNotInSelectStar( String name ) {
        Column column = columnsByName.get(name);
        if (column == null) return this;
        if (!getSelectAllColumnsByName().containsKey(name)) {
            return this; // already not in select *
        }
        List selectStarColumns = new LinkedList(this.selectStarColumns);
        Map selectStarColumnsByName = new HashMap(this.selectStarColumnsByName);
        selectStarColumns.remove(column);
        selectStarColumnsByName.remove(name);
        return new ImmutableTable(this.name, columnsByName, columns, keys, extraColumns, selectStarColumnsByName,
                                  selectStarColumns);
    }

    @Override
    public String toString() {
        StringBuilder sb = new StringBuilder(name.name());
        sb.append('(');
        boolean first = true;
        for (Column column : columns) {
            if (first) first = false;
            else sb.append(", ");
            sb.append(column);
        }
        sb.append(')');
        if (!keys.isEmpty()) {
            sb.append(" with keys ");
            first = true;
            for (Key key : keys) {
                if (first) first = false;
                else sb.append(", ");
                sb.append(key);
            }
        }
        return sb.toString();
    }
}