/**
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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.waveprotocol.wave.model.wave.undo;
import org.waveprotocol.wave.model.operation.OperationPair;
import org.waveprotocol.wave.model.operation.TransformException;
import org.waveprotocol.wave.model.undo.UndoManagerImpl;
import org.waveprotocol.wave.model.undo.UndoManagerPlus;
import java.util.List;
/**
* A factory for undo managers.
*
*/
final class UndoManagerFactory {
private UndoManagerFactory() { }
private static final UndoManagerImpl.Algorithms<AggregateOperation> algorithms =
new UndoManagerImpl.Algorithms<AggregateOperation>() {
@Override
public AggregateOperation compose(List<AggregateOperation> operations) {
return AggregateOperation.compose(operations);
}
@Override
public AggregateOperation invert(AggregateOperation operation) {
return operation.invert();
}
@Override
public OperationPair<AggregateOperation> transform(AggregateOperation op1,
AggregateOperation op2) throws TransformException {
return AggregateOperation.transform(op1, op2);
}
};
/**
* Create a new undo manager.
*
* @return A new undo manager.
*/
public static UndoManagerPlus<AggregateOperation> createUndoManager() {
return new UndoManagerImpl<AggregateOperation>(algorithms);
}
private static final UndoManagerImpl.Algorithms<WaveAggregateOp> wAlgorithms =
new UndoManagerImpl.Algorithms<WaveAggregateOp>() {
@Override
public WaveAggregateOp compose(List<WaveAggregateOp> operations) {
return WaveAggregateOp.compose(operations);
}
@Override
public WaveAggregateOp invert(WaveAggregateOp operation) {
return operation.invert();
}
@Override
public OperationPair<WaveAggregateOp> transform(WaveAggregateOp op1, WaveAggregateOp op2)
throws TransformException {
return WaveAggregateOp.transform(op1, op2);
}
};
/**
* Create a new undo manager.
*
* @return A new undo manager.
*/
public static UndoManagerPlus<WaveAggregateOp> createWUndoManager() {
return new UndoManagerImpl<WaveAggregateOp>(wAlgorithms);
}
}