/**
 * 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.wave.model.id;


/**
 * Serialises and deserialises wave ids and wavelet ids to and from
 * the format <domain>!<id>.
 *
 * This serialiser does not support methods for (de-)serialising wavelet names.
 *
 * @author zdwang@google.com (David Wang)
 */
public class LegacyIdSerialiser implements IdSerialiser {

  public static final LegacyIdSerialiser INSTANCE = new LegacyIdSerialiser();

  /** Separates a wave id from a wavelet id in serialised form. */
  public static final char PART_SEPARATOR = '!';

  @Override
  public String serialiseWaveId(WaveId waveId) {
    return waveId.getDomain() + LegacyIdSerialiser.PART_SEPARATOR + waveId.getId();
  }

  @Override
  public String serialiseWaveletId(WaveletId waveletId) {
    return waveletId.getDomain() + LegacyIdSerialiser.PART_SEPARATOR + waveletId.getId();
  }

  /**
   * @throws UnsupportedOperationException always
   */
  @Override
  public String serialiseWaveletName(WaveletName name) {
    throw new UnsupportedOperationException("No legacy serialization for wavelet names");
  }

  @Override
  public WaveId deserialiseWaveId(String serialisedForm) throws InvalidIdException {
    String[] parts = SimplePrefixEscaper.DEFAULT_ESCAPER.splitWithoutUnescaping(
        LegacyIdSerialiser.PART_SEPARATOR, serialisedForm);
    if ((parts.length != 2) || parts[0].isEmpty() || parts[1].isEmpty()) {
      throw new InvalidIdException(serialisedForm,
          "Wave id must be of the form <domain>" + LegacyIdSerialiser.PART_SEPARATOR + "<id>");
    }
    try {
      return WaveId.ofLegacy(parts[0], parts[1]);
    } catch (IllegalArgumentException ex) {
      throw new InvalidIdException(serialisedForm, ex.getMessage());
    }
  }

  @Override
  public WaveletId deserialiseWaveletId(String serialisedForm) throws InvalidIdException {
    String[] parts = SimplePrefixEscaper.DEFAULT_ESCAPER.splitWithoutUnescaping(
        LegacyIdSerialiser.PART_SEPARATOR, serialisedForm);
    if ((parts.length != 2) || parts[0].isEmpty() || parts[1].isEmpty()) {
      throw new InvalidIdException(serialisedForm,
          "Wavelet id must be of the form <domain>" + LegacyIdSerialiser.PART_SEPARATOR + "<id>");
    }
    try {
      return WaveletId.ofLegacy(parts[0], parts[1]);
    } catch (IllegalArgumentException ex) {
      throw new InvalidIdException(serialisedForm, ex.getMessage());
    }
  }

  /**
   * @throws UnsupportedOperationException always
   */
  @Override
  public WaveletName deserialiseWaveletName(String serializedForm) {
    throw new UnsupportedOperationException("No legacy serialization for wavelet names");
  }

  private LegacyIdSerialiser() {
  }
}