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 org.modeshape.schematic.document.Path;
019import org.modeshape.schematic.internal.HashCode;
020import org.modeshape.schematic.internal.document.MutableArray;
021import org.modeshape.schematic.internal.document.MutableDocument;
022
023/**
024 * An atomic array remove operation for SchematicValueDelta.
025 * 
026 * @author Randall Hauch <rhauch@redhat.com> (C) 2011 Red Hat Inc.
027 */
028public class RemoveValueOperation extends ArrayOperation {
029
030    protected final Object value;
031    protected transient int actualIndex = -1;
032
033    public RemoveValueOperation( Path parentPath,
034                                 Object value ) {
035        super(parentPath, HashCode.compute(parentPath, value));
036        this.value = value;
037    }
038
039    @Override
040    public RemoveValueOperation clone() {
041        return new RemoveValueOperation(getParentPath(), cloneValue(value));
042    }
043
044    @Override
045    public void rollback( MutableDocument delegate ) {
046        if (actualIndex > -1) {
047            MutableArray array = mutableParent(delegate);
048            array.add(actualIndex, value);
049        }
050    }
051
052    public Object getRemovedValue() {
053        return value;
054    }
055
056    public int getActualIndex() {
057        return actualIndex;
058    }
059
060    @Override
061    public void replay( MutableDocument delegate ) {
062        MutableArray array = mutableParent(delegate);
063        actualIndex = array.indexOf(value);
064        array.remove(actualIndex);
065    }
066
067    @Override
068    public String toString() {
069        return "Remove at '" + parentPath + "' the value '" + value + "'";
070    }
071
072    @Override
073    public int hashCode() {
074        return super.hashCode();
075    }
076
077    @Override
078    public boolean equals( Object obj ) {
079        if (obj instanceof RemoveValueOperation) {
080            RemoveValueOperation other = (RemoveValueOperation)obj;
081            return equalsIfNotNull(value, other.value) && equalsIfNotNull(getParentPath(), other.getParentPath());
082
083        }
084        return false;
085    }
086}