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.MutableDocument;
021
022/**
023 * An atomic put operation for SchematicValueDelta.
024 * 
025 * @author (various)
026 */
027public class PutOperation extends Operation {
028    protected final String fieldName;
029    protected final Object oldValue;
030    protected final Object newValue;
031
032    public PutOperation( Path parentPath,
033                         String fieldName,
034                         Object oldValue,
035                         Object newValue ) {
036        super(parentPath, HashCode.compute(parentPath, fieldName, /*oldValue,*/newValue));
037        this.fieldName = fieldName;
038        this.oldValue = oldValue;
039        this.newValue = newValue;
040    }
041
042    @Override
043    public PutOperation clone() {
044        return new PutOperation(getParentPath(), fieldName, cloneValue(oldValue), cloneValue(newValue));
045    }
046
047    public Object getNewValue() {
048        return newValue;
049    }
050
051    public Object getOldValue() {
052        return oldValue;
053    }
054
055    public String getFieldName() {
056        return fieldName;
057    }
058
059    @Override
060    public void rollback( MutableDocument delegate ) {
061        MutableDocument parent = mutableParent(delegate);
062        assert parent != null;
063        if (oldValue == null) {
064            parent.remove(fieldName);
065        } else {
066            parent.put(fieldName, oldValue);
067        }
068    }
069
070    @Override
071    public void replay( MutableDocument delegate ) {
072        MutableDocument parent = mutableParent(delegate);
073        assert parent != null;
074        parent.put(fieldName, newValue);
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 PutOperation) {
085            PutOperation other = (PutOperation)obj;
086            return equalsIfNotNull(fieldName, other.fieldName) /*&& equalsIfNotNull(oldValue, other.oldValue)*/
087                   && equalsIfNotNull(newValue, other.newValue) && equalsIfNotNull(getParentPath(), other.getParentPath());
088        }
089        return false;
090    }
091
092    @Override
093    public String toString() {
094        return "Put at '" + parentPath + "' the '" + fieldName + "' field value '" + newValue
095               + (oldValue != null ? "' (replaces '" + oldValue + "')" : "'");
096    }
097}