/**
* Copyright 2009 Google Inc.
*
* 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.waveprotocol.wave.model.operation;
import org.waveprotocol.wave.model.util.CollectionUtils;
import java.util.Collections;
import java.util.List;
/**
* A {@link SilentOperationSink} which builds up a list of operations it has
* consumed.
*
*/
public final class CapturingOperationSink<T extends Operation<?>> implements SilentOperationSink<
T> {
private final List<T> captured;
/** Creates a sink for capturing operations. */
public CapturingOperationSink() {
captured = CollectionUtils.newArrayList();
}
@Override
public void consume(T op) {
captured.add(op);
}
/**
* Gets a view of the operations that have been captured by this sink, in the
* order they were captured.
*
* @return a list of operations captured so far that will update as more
* operations are consumed.
*/
public List<T> getOps() {
return Collections.unmodifiableList(captured);
}
/**
* Clears the list of operations captured by this sink.
*/
public void clear() {
captured.clear();
}
}