/**
* 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.version.HashedVersion;
import org.waveprotocol.wave.model.wave.ParticipantId;
import org.waveprotocol.wave.model.wave.data.ReadableBlipData;
import org.waveprotocol.wave.model.wave.data.ReadableWaveletData;
import java.util.Collections;
import java.util.Set;
/**
* A basic implementation for an empty ReadableWaveletData.
*/
public class EmptyWaveletSnapshot implements ReadableWaveletData {
private final WaveId waveId;
private final WaveletId waveletId;
private final ParticipantId creator;
private final long creationTime;
private final HashedVersion hashedVersion;
/**
* Creates an empty snapshot.
*/
public EmptyWaveletSnapshot(WaveId waveId, WaveletId waveletId, ParticipantId creator,
HashedVersion version, long creationTime) {
this.waveId = waveId;
this.waveletId = waveletId;
this.creator = creator;
this.hashedVersion = version;
this.creationTime = creationTime;
}
@Override
public long getCreationTime() {
return creationTime;
}
@Override
public ParticipantId getCreator() {
return creator;
}
@Override
public HashedVersion getHashedVersion() {
return hashedVersion;
}
@Override
public ReadableBlipData getDocument(String documentName) {
return null;
}
@Override
public Set<String> getDocumentIds() {
return Collections.emptySet();
}
@Override
public long getLastModifiedTime() {
return getCreationTime();
}
@Override
public Set<ParticipantId> getParticipants() {
return Collections.emptySet();
}
@Override
public long getVersion() {
return getHashedVersion().getVersion();
}
@Override
public WaveId getWaveId() {
return waveId;
}
@Override
public WaveletId getWaveletId() {
return waveletId;
}
}