/**
* 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.wave.ParticipantId;
import org.waveprotocol.wave.model.wave.data.BlipData;
import org.waveprotocol.wave.model.wave.data.ReadableBlipData;
/**
* Presents a {@link ReadableBlipData} as a {@link BlipData}, where
* all mutation methods throw {@link UnsupportedOperationException}.
*
*/
public final class UnmodifiableBlipData extends ForwardingReadableBlipData implements BlipData {
private static final UnmodifiableWaveletData.Factory WAVELET_FACTORY =
new UnmodifiableWaveletData.Factory();
private final ReadableBlipData data;
private UnmodifiableWaveletData wavelet; // populated lazily
public UnmodifiableBlipData(ReadableBlipData data) {
this.data = data;
}
@Override
protected ReadableBlipData delegate() {
return data;
}
/**
* {@inheritDoc}
*
* Overrides the implementation from {@link ForwardingReadableBlipData} in
* order to return a subtype of {@link WaveletData}, as required by the
* {@link BlipData} interface.
*/
@Override
public UnmodifiableWaveletData getWavelet() {
if (wavelet == null) {
wavelet = WAVELET_FACTORY.create(data.getWavelet());
}
return wavelet;
}
@Override
final public void submit() {
throw new UnsupportedOperationException(
"UnmodifiableBlipData doesn't support submit");
}
@Override
final public long setLastModifiedTime(long newTime) {
throw new UnsupportedOperationException(
"UnmodifiableBlipData doesn't support setLastModifiedTime");
}
@Override
final public long setLastModifiedVersion(long newVersion) {
throw new UnsupportedOperationException(
"UnmodifiableBlipData doesn't support setLastModifiedVersion");
}
@Deprecated
@Override
public void onRemoteContentModified() {
throw new UnsupportedOperationException(
"UnmodifiableBlipData doesn't support onRemoteContentModified");
}
@Override
public void addContributor(ParticipantId participant) {
throw new UnsupportedOperationException(
"UnmodifiableBlipData doesn't support addContributor");
}
@Override
public void removeContributor(ParticipantId participant) {
throw new UnsupportedOperationException(
"UnmodifiableBlipData doesn't support removeContributor");
}
}