/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License, Version 1.0 only
 * (the "License").  You may not use this file except in compliance
 * with the License.
 *
 * You can obtain a copy of the license at
 * trunk/opends/resource/legal-notices/OpenDS.LICENSE
 * or https://OpenDS.dev.java.net/OpenDS.LICENSE.
 * See the License for the specific language governing permissions
 * and limitations under the License.
 *
 * When distributing Covered Code, include this CDDL HEADER in each
 * file and include the License file at
 * trunk/opends/resource/legal-notices/OpenDS.LICENSE.  If applicable,
 * add the following below this CDDL HEADER, with the fields enclosed
 * by brackets "[]" replaced with your own identifying information:
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 * CDDL HEADER END
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 *
 *      Copyright 2008-2009 Sun Microsystems, Inc.
 */

package org.opends.server.admin;



/**
 * A managed object composite relationship definition which represents
 * a composition of a single managed object (i.e. the managed object
 * must be present).
 *
 * @param <C>
 *          The type of client managed object configuration that this
 *          relation definition refers to.
 * @param <S>
 *          The type of server managed object configuration that this
 *          relation definition refers to.
 */
public final class SingletonRelationDefinition
    <C extends ConfigurationClient, S extends Configuration>
    extends RelationDefinition<C, S> {

  /**
   * An interface for incrementally constructing singleton relation
   * definitions.
   *
   * @param <C>
   *          The type of client managed object configuration that
   *          this relation definition refers to.
   * @param <S>
   *          The type of server managed object configuration that
   *          this relation definition refers to.
   */
  public static final class Builder
      <C extends ConfigurationClient, S extends Configuration>
      extends AbstractBuilder<C, S, SingletonRelationDefinition<C, S>> {

    // The optional default managed object associated with this
    // singleton relation.
    private DefaultManagedObject<? extends C, ? extends S>
      defaultManagedObject = null;



    /**
     * Creates a new builder which can be used to incrementally build
     * an singleton relation definition.
     *
     * @param pd
     *          The parent managed object definition.
     * @param name
     *          The name of the relation.
     * @param cd
     *          The child managed object definition.
     */
    public Builder(AbstractManagedObjectDefinition<?, ?> pd, String name,
        AbstractManagedObjectDefinition<C, S> cd) {
      super(pd, name, cd);
    }



    /**
     * Sets the optional default managed object associated with this
     * singleton relation definition.
     *
     * @param defaultManagedObject
     *          The default managed object or <code>null</code> if
     *          there is no default managed object defined for this
     *          relation definition.
     */
    public void setDefaultManagedObject(
        DefaultManagedObject<? extends C, ? extends S> defaultManagedObject) {
      this.defaultManagedObject = defaultManagedObject;
    }



    /**
     * {@inheritDoc}
     */
    @Override
    protected SingletonRelationDefinition<C, S> buildInstance(
        Common<C, S> common) {
      return new SingletonRelationDefinition<C, S>(common,
          defaultManagedObject);
    }

  }



  // The optional default managed object associated with this
  // singleton relation.
  private final DefaultManagedObject<? extends C, ? extends S>
    defaultManagedObject;



  // Private constructor.
  private SingletonRelationDefinition(Common<C, S> common,
      DefaultManagedObject<? extends C, ? extends S> defaultManagedObject) {
    super(common);
    this.defaultManagedObject = defaultManagedObject;
  }



  /**
   * {@inheritDoc}
   */
  @Override
  public <R, P> R accept(RelationDefinitionVisitor<R, P> v, P p) {
    return v.visitSingleton(this, p);
  }



  /**
   * Gets the optional default managed object associated with this
   * singleton relation definition.
   *
   * @return Returns the default managed object or <code>null</code>
   *         if there is no default managed object defined for this
   *         relation definition.
   */
  public DefaultManagedObject<? extends C, ? extends S>
      getDefaultManagedObject() {
    return defaultManagedObject;
  }



  /**
   * {@inheritDoc}
   */
  @Override
  public void toString(StringBuilder builder) {
    builder.append("name=");
    builder.append(getName());
    builder.append(" type=singleton parent=");
    builder.append(getParentDefinition().getName());
    builder.append(" child=");
    builder.append(getChildDefinition().getName());
  }



  /**
   * {@inheritDoc}
   */
  @Override
  protected void initialize() throws Exception {
    if (defaultManagedObject != null) {
      defaultManagedObject.initialize();
    }
  }

}
