001/*
002 * ModeShape (http://www.modeshape.org)
003 *
004 * Licensed under the Apache License, Version 2.0 (the "License");
005 * you may not use this file except in compliance with the License.
006 * You may obtain a copy of the License at
007 *
008 *       http://www.apache.org/licenses/LICENSE-2.0
009 *
010 * Unless required by applicable law or agreed to in writing, software
011 * distributed under the License is distributed on an "AS IS" BASIS,
012 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
013 * See the License for the specific language governing permissions and
014 * limitations under the License.
015 */
016package org.modeshape.schematic.internal.delta;
017
018import java.util.Collection;
019import java.util.List;
020import org.modeshape.schematic.document.Array.Entry;
021import org.modeshape.schematic.document.Path;
022import org.modeshape.schematic.internal.HashCode;
023import org.modeshape.schematic.internal.document.MutableArray;
024import org.modeshape.schematic.internal.document.MutableDocument;
025
026/**
027 * An atomic array add operation for SchematicValueDelta.
028 * 
029 * @author Randall Hauch <rhauch@redhat.com> (C) 2011 Red Hat Inc.
030 */
031public class RetainAllValuesOperation extends ArrayOperation {
032
033    protected final Collection<?> values;
034    protected transient List<Entry> removedEntries;
035
036    public RetainAllValuesOperation( Path parentPath,
037                                     Collection<?> values ) {
038        super(parentPath, HashCode.compute(parentPath, values));
039        this.values = values;
040    }
041
042    @Override
043    public RetainAllValuesOperation clone() {
044        return new RetainAllValuesOperation(getParentPath(), cloneValues(values));
045    }
046
047    @Override
048    public void rollback( MutableDocument delegate ) {
049        if (removedEntries != null) {
050            // Add into the same locations ...
051            MutableArray array = mutableParent(delegate);
052            for (Entry entry : removedEntries) {
053                array.add(entry.getIndex(), entry.getValue());
054            }
055        }
056    }
057
058    public Collection<?> getRetainedValues() {
059        return values;
060    }
061
062    public List<Entry> getRemovedEntries() {
063        return removedEntries;
064    }
065
066    @Override
067    public void replay( MutableDocument delegate ) {
068        MutableArray array = mutableParent(delegate);
069        removedEntries = array.retainAllValues(values);
070    }
071
072    @Override
073    public String toString() {
074        return "Retain at '" + parentPath + "' the values: " + values;
075    }
076
077    @Override
078    public int hashCode() {
079        return super.hashCode();
080    }
081
082    @Override
083    public boolean equals( Object obj ) {
084        if (obj instanceof RetainAllValuesOperation) {
085            RetainAllValuesOperation other = (RetainAllValuesOperation)obj;
086            return equalsIfNotNull(values, other.values) && equalsIfNotNull(getParentPath(), other.getParentPath());
087
088        }
089        return false;
090    }
091}