/**
* Copyright 2010 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.wave.data.impl;
import org.waveprotocol.wave.model.id.WaveId;
import org.waveprotocol.wave.model.id.WaveletId;
import org.waveprotocol.wave.model.util.CollectionUtils;
import org.waveprotocol.wave.model.util.Preconditions;
import org.waveprotocol.wave.model.wave.data.ObservableWaveletData;
import org.waveprotocol.wave.model.wave.data.WaveViewData;
import java.util.Collection;
import java.util.Collections;
import java.util.Map;
/**
* A skeleton implementation of {@link WaveViewData}.
*
*/
public class WaveViewDataImpl implements WaveViewData {
/** The wave id */
private final WaveId id;
/** Wavelets in this wave. */
private final Map<WaveletId, ObservableWaveletData> wavelets = CollectionUtils.newHashMap();
private WaveViewDataImpl(WaveId id) {
this.id = id;
}
/**
* Creates an empty wave.
*
* @param id wave id
*/
public static WaveViewDataImpl create(WaveId id) {
return new WaveViewDataImpl(id);
}
/**
* Creates a wave with some initial state.
*
* @param id wave id
* @param wavelets initial wavelet data
*/
public static WaveViewDataImpl create(
WaveId id, Collection<? extends ObservableWaveletData> wavelets) {
WaveViewDataImpl wave = new WaveViewDataImpl(id);
for (ObservableWaveletData wavelet : wavelets) {
wave.addWavelet(wavelet);
}
return wave;
}
@Override
public WaveId getWaveId() {
return id;
}
@Override
public Iterable<? extends ObservableWaveletData> getWavelets() {
return Collections.unmodifiableCollection(wavelets.values());
}
@Override
public ObservableWaveletData getWavelet(WaveletId waveletId) {
return wavelets.get(waveletId);
}
@Override
public void addWavelet(ObservableWaveletData wavelet) {
WaveletId waveletId = wavelet.getWaveletId();
Preconditions.checkArgument(
!wavelets.containsKey(waveletId), "Duplicate wavelet id: %s", waveletId);
wavelets.put(waveletId, wavelet);
}
@Override
public void removeWavelet(WaveletId waveletId) {
if (wavelets.remove(waveletId) == null) {
throw new IllegalArgumentException(waveletId + " is not present");
}
}
}