/**
* 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.box.server.common;
import org.waveprotocol.box.common.comms.WaveClientRpc.DocumentSnapshot;
import org.waveprotocol.box.common.comms.WaveClientRpc.WaveletSnapshot;
import org.waveprotocol.wave.model.document.operation.DocInitialization;
import org.waveprotocol.wave.model.document.operation.DocOp;
import org.waveprotocol.wave.model.document.operation.impl.DocOpUtil;
import org.waveprotocol.wave.model.id.InvalidIdException;
import org.waveprotocol.wave.model.id.ModernIdSerialiser;
import org.waveprotocol.wave.model.id.WaveId;
import org.waveprotocol.wave.model.id.WaveletId;
import org.waveprotocol.wave.model.operation.OperationException;
import org.waveprotocol.wave.model.schema.SchemaCollection;
import org.waveprotocol.wave.model.util.CollectionUtils;
import org.waveprotocol.wave.model.version.HashedVersion;
import org.waveprotocol.wave.model.wave.InvalidParticipantAddress;
import org.waveprotocol.wave.model.wave.ParticipantId;
import org.waveprotocol.wave.model.wave.data.ObservableWaveletData;
import org.waveprotocol.wave.model.wave.data.ReadableBlipData;
import org.waveprotocol.wave.model.wave.data.ReadableWaveletData;
import org.waveprotocol.wave.model.wave.data.WaveletData;
import org.waveprotocol.wave.model.wave.data.impl.EmptyWaveletSnapshot;
import org.waveprotocol.wave.model.wave.data.impl.ObservablePluggableMutableDocument;
import org.waveprotocol.wave.model.wave.data.impl.WaveletDataImpl;
import java.util.Collection;
/**
* Utility class for serialising/deserialising model objects (and their
* components) to/from their protocol buffer representations.
*
* NOTE: This class is mirrored in the client. Any changes here should also be
* made in
* {@link org.waveprotocol.box.webclient.common.SnapshotSerializer}
*
* @author Joseph Gentle (josephg@gmail.com)
*/
public class SnapshotSerializer {
private SnapshotSerializer() {
}
/**
* Serializes a snapshot for a wavelet.
*
* @param wavelet wavelet to snapshot
* @param hashedVersion hashed version of the wavelet
* @return a wavelet snapshot that contains all the information in the
* original wavelet.
*/
public static WaveletSnapshot serializeWavelet(ReadableWaveletData wavelet,
HashedVersion hashedVersion) {
WaveletSnapshot.Builder builder = WaveletSnapshot.newBuilder();
builder.setWaveletId(ModernIdSerialiser.INSTANCE.serialiseWaveletId(wavelet.getWaveletId()));
for (ParticipantId participant : wavelet.getParticipants()) {
builder.addParticipantId(participant.toString());
}
for (String id : wavelet.getDocumentIds()) {
ReadableBlipData data = wavelet.getDocument(id);
builder.addDocument(serializeDocument(data));
}
builder.setVersion(CoreWaveletOperationSerializer.serialize(hashedVersion));
builder.setLastModifiedTime(wavelet.getLastModifiedTime());
builder.setCreator(wavelet.getCreator().getAddress());
builder.setCreationTime(wavelet.getCreationTime());
return builder.build();
}
/**
* Deserializes the snapshot contained in the {@link WaveletSnapshot}
* into an {@link ObservableWaveletData}.
*
* @param snapshot the {@link WaveletSnapshot} to deserialize.
* @throws OperationException if the ops in the snapshot can not be applied.
* @throws InvalidParticipantAddress
* @throws InvalidIdException
*/
public static ObservableWaveletData deserializeWavelet(WaveletSnapshot snapshot, WaveId waveId)
throws OperationException, InvalidParticipantAddress, InvalidIdException {
ObservableWaveletData.Factory<? extends ObservableWaveletData> factory =
WaveletDataImpl.Factory.create(
ObservablePluggableMutableDocument.createFactory(SchemaCollection.empty()));
ParticipantId author = ParticipantId.of(snapshot.getCreator());
WaveletId waveletId = ModernIdSerialiser.INSTANCE.deserialiseWaveletId(snapshot.getWaveletId());
long creationTime = snapshot.getCreationTime();
ObservableWaveletData wavelet = factory.create(new EmptyWaveletSnapshot(waveId, waveletId,
author, CoreWaveletOperationSerializer.deserialize(snapshot.getVersion()), creationTime));
for (String participant : snapshot.getParticipantIdList()) {
wavelet.addParticipant(getParticipantId(participant));
}
for (DocumentSnapshot document : snapshot.getDocumentList()) {
addDocumentSnapshotToWavelet(document, wavelet);
}
wavelet.setVersion(snapshot.getVersion().getVersion());
wavelet.setLastModifiedTime(snapshot.getLastModifiedTime());
// The creator and creation time are set when the empty wavelet template is
// created above.
return wavelet;
}
/**
* Serializes a document to a document snapshot.
*
* @param document The document to serialize
* @return A snapshot of the given document
*/
public static DocumentSnapshot serializeDocument(ReadableBlipData document) {
DocumentSnapshot.Builder builder = DocumentSnapshot.newBuilder();
builder.setDocumentId(document.getId());
builder.setDocumentOperation(CoreWaveletOperationSerializer.serialize(
document.getContent().asOperation()));
builder.setAuthor(document.getAuthor().getAddress());
for (ParticipantId participant : document.getContributors()) {
builder.addContributor(participant.getAddress());
}
builder.setLastModifiedVersion(document.getLastModifiedVersion());
builder.setLastModifiedTime(document.getLastModifiedTime());
return builder.build();
}
// TODO(ljvderijk): Should be removed once the AbstractWaveletData changes
private static ParticipantId getParticipantId(String address) throws InvalidParticipantAddress {
return ParticipantId.of(address);
}
private static void addDocumentSnapshotToWavelet(
DocumentSnapshot snapshot, WaveletData container) throws InvalidParticipantAddress {
DocOp op = CoreWaveletOperationSerializer.deserialize(snapshot.getDocumentOperation());
DocInitialization docInit = DocOpUtil.asInitialization(op);
Collection<ParticipantId> contributors = CollectionUtils.newArrayList();
for (String p : snapshot.getContributorList()) {
contributors.add(getParticipantId(p));
}
container.createDocument(
snapshot.getDocumentId(),
getParticipantId(snapshot.getAuthor()),
contributors,
docInit,
snapshot.getLastModifiedTime(),
snapshot.getLastModifiedVersion());
}
}