/**
* 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.id;
import org.waveprotocol.wave.model.util.Preconditions;
/**
* Id serialiser for spec-conforming identifiers.
*
* This serialiser throws a runtime exception if an attempt is made to serialise
* a non-conforming id. This check may be removed once it's no longer possible
* to construct one.
*
* @author anorth@google.com (Alex North)
*/
public class ModernIdSerialiser implements IdSerialiser {
public static final ModernIdSerialiser INSTANCE = new ModernIdSerialiser();
private static final String SEP = "/";
private static final String ELIDE = "~";
@Override
public String serialiseWaveId(WaveId id) {
// These checks will be unnecessary once it's impossible to construct
// a wave id that violates them.
Preconditions.checkArgument(WaveIdentifiers.isValidDomain(0, id.getDomain()),
"Invalid domain %s", id.getDomain());
Preconditions.checkArgument(WaveIdentifiers.isValidIdentifier(id.getId()),
"Invalid id %s", id.getId());
return new StringBuilder(id.getDomain()).append(SEP).append(id.getId()).toString();
}
@Override
public String serialiseWaveletId(WaveletId id) {
// These checks will be unnecessary once it's impossible to construct
// a wavelet id that violates them.
Preconditions.checkArgument(WaveIdentifiers.isValidDomain(0, id.getDomain()),
"Invalid domain %s", id.getDomain());
Preconditions.checkArgument(WaveIdentifiers.isValidIdentifier(id.getId()),
"Invalid id %s", id.getId());
return new StringBuilder(id.getDomain()).append(SEP).append(id.getId()).toString();
}
@Override
public String serialiseWaveletName(WaveletName name) {
StringBuilder b = new StringBuilder(serialiseWaveId(name.waveId)).append(SEP);
if (name.waveletId.getDomain().equals(name.waveId.getDomain())) {
b.append(ELIDE);
} else {
b.append(name.waveletId.getDomain());
}
b.append(SEP).append(name.waveletId.getId());
return b.toString();
}
@Override
public WaveId deserialiseWaveId(String serialisedForm) throws InvalidIdException {
String[] tokens = serialisedForm.split(SEP);
if (tokens.length != 2) {
throw new InvalidIdException(serialisedForm,
"Required 2 '/'-separated tokens in serialised wave id: " + serialisedForm);
}
return WaveId.ofChecked(tokens[0], tokens[1]);
}
@Override
public WaveletId deserialiseWaveletId(String serialisedForm) throws InvalidIdException {
String[] tokens = serialisedForm.split(SEP);
if (tokens.length != 2) {
throw new InvalidIdException(serialisedForm,
"Required 2 '/'-separated tokens in serialised wavelet id: " + serialisedForm);
}
return WaveletId.ofChecked(tokens[0], tokens[1]);
}
@Override
public WaveletName deserialiseWaveletName(String serialisedForm) throws InvalidIdException {
if (serialisedForm.endsWith("/")) {
throw new InvalidIdException(serialisedForm, "Serialised wavelet name had trailing '/'");
}
String[] tokens = serialisedForm.split(SEP);
if (tokens.length != 4) {
throw new InvalidIdException(serialisedForm,
"Required 4 '/'-separated tokens in serialised wavelet name: " + serialisedForm);
}
if (tokens[2].equals(tokens[0])) {
throw new InvalidIdException(serialisedForm,
"Serialised wavelet name had un-normalised domains");
}
if (tokens[2].equals(ELIDE)) {
tokens[2] = tokens[0];
}
return WaveletName.of(WaveId.ofChecked(tokens[0], tokens[1]),
WaveletId.ofChecked(tokens[2], tokens[3]));
}
private ModernIdSerialiser() {
}
}