Id.java

/**
 * Licensed to The Apereo Foundation under one or more contributor license
 * agreements. See the NOTICE file distributed with this work for additional
 * information regarding copyright ownership.
 *
 *
 * The Apereo Foundation licenses this file to you under the Educational
 * Community 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://opensource.org/licenses/ecl2.txt
 *
 * 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.opencastproject.mediapackage.identifier;

import javax.xml.bind.annotation.adapters.XmlAdapter;
import javax.xml.bind.annotation.adapters.XmlJavaTypeAdapter;

/**
 * Interface for an identifier.
 */
@XmlJavaTypeAdapter(Id.Adapter.class)
public interface Id {

  /**
   * Returns the local identifier of this {@link Id}. The local identifier is defined to be free of separator characters
   * that could potentially get into the way when creating file or directory names from the identifier.
   *
   * For example, given that the interface is implemented by a class representing CNRI handles, the identifier would
   * then look something like <code>10.3930/ETHZ/abcd</code>, whith <code>10.3930</code> being the handle prefix,
   * <code>ETH</code> the authority and <code>abcd</code> the local part. <code>toURI()</code> would then return
   * <code>10.3930-ETH-abcd</code> or any other suitable form.
   *
   * @return a path separator-free representation of the identifier
   */
  String compact();

  class Adapter extends XmlAdapter<IdImpl, Id> {
    public IdImpl marshal(Id id) throws Exception {
      if (id instanceof IdImpl) {
        return (IdImpl) id;
      } else if (id instanceof HandleImpl) {
        return (HandleImpl) id;
      } else {
        throw new IllegalStateException("an unknown ID is un use: " + id);
      }
    }

    public Id unmarshal(IdImpl id) throws Exception {
      return id;
    }
  }

  /**
   * Return a string representation of the identifier from which an object of type Id should
   * be reconstructable.
   */
  String toString();
}