/**
* 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.box.webclient.client;
import com.google.common.base.Preconditions;
import org.waveprotocol.box.webclient.search.WaveStore;
import org.waveprotocol.wave.model.document.WaveContext;
import org.waveprotocol.wave.model.id.WaveId;
import org.waveprotocol.wave.model.util.CollectionUtils;
import org.waveprotocol.wave.model.util.CopyOnWriteSet;
import java.util.Collections;
import java.util.Map;
/**
* A trivial implementation of a wave store.
*
* @author hearnden@google.com (David Hearnden)
*/
public final class SimpleWaveStore implements WaveStore {
private final CopyOnWriteSet<Listener> listeners = CopyOnWriteSet.create();
private final Map<WaveId, WaveContext> waves = CollectionUtils.newHashMap();
private final Map<WaveId, WaveContext> wavesView = Collections.unmodifiableMap(waves);
/**
* Creates a wave store.
*/
public SimpleWaveStore() {
}
@Override
public void add(WaveContext wave) {
WaveId id = wave.getWave().getWaveId();
Preconditions.checkArgument(!waves.containsKey(id));
waves.put(id, wave);
fireOnWaveOpened(wave);
}
@Override
public void remove(WaveContext wave) {
WaveId id = wave.getWave().getWaveId();
Preconditions.checkArgument(waves.get(id) == wave);
waves.remove(id);
fireOnWaveClosed(wave);
}
@Override
public Map<WaveId, WaveContext> getOpenWaves() {
return wavesView;
}
//
// Events
//
@Override
public void addListener(Listener listener) {
listeners.add(listener);
}
@Override
public void removeListener(Listener listener) {
listeners.remove(listener);
}
private void fireOnWaveOpened(WaveContext wave) {
for (Listener listener : listeners) {
listener.onOpened(wave);
}
}
private void fireOnWaveClosed(WaveContext wave) {
for (Listener listener : listeners) {
listener.onClosed(wave);
}
}
}