/*
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* CDDL HEADER START
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*
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* The contents of this file are subject to the terms of the
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* Common Development and Distribution License, Version 1.0 only
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* (the "License"). You may not use this file except in compliance
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* with the License.
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*
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* You can obtain a copy of the license at
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* trunk/opends/resource/legal-notices/OpenDS.LICENSE
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* or https://OpenDS.dev.java.net/OpenDS.LICENSE.
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* See the License for the specific language governing permissions
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* and limitations under the License.
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*
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* When distributing Covered Code, include this CDDL HEADER in each
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* file and include the License file at
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* trunk/opends/resource/legal-notices/OpenDS.LICENSE. If applicable,
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* add the following below this CDDL HEADER, with the fields enclosed
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* by brackets "[]" replaced with your own identifying information:
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* Portions Copyright [yyyy] [name of copyright owner]
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*
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* CDDL HEADER END
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*
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*
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* Portions Copyright 2007 Sun Microsystems, Inc.
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*/
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package org.opends.server.admin;
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/**
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* Relation definitions define relationships between types of managed
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* objects. In addition they define the ownership model:
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* <ul>
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* <li>composition - referenced managed objects are owned by the
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* parent managed object and are deleted when the parent is deleted
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* <li>aggregation - referenced managed objects are not owned by the
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* parent managed object. Instead they are shared by other managed
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* objects.
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* </ul>
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* Relations define how clients interact with the configuration. For
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* example, clients manage aggregated managed objects in a shared
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* location and attach them to parent managed objects. Composed
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* managed objects, on the other hand, would be created directly
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* beneath the parent managed object and destroyed with it too.
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* <p>
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* Within the server, listeners can choose to request notification of
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* managed objects being added or removed from relations.
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* <p>
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* In LDAP, compositions are represented as follows:
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* <ul>
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* <li>singleton relations (one to one): a referenced managed object
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* is represented using a child entry directly beneath the parent
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* <li>optional relations (one to zero or one): a referenced managed
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* object is represented using a child entry directly beneath the
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* parent
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* <li>instantiable relations (one to many): the relation is
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* represented using a child entry directly beneath the parent.
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* Referenced managed objects are represented using child entries of
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* this "relation entry".
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* </ul>
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* Whereas, aggregations are represented by storing the DNs of the
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* referenced managed objects in an attribute of the aggregating
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* managed object.
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*
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* @param <C>
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* The type of client managed object configuration that this
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* relation definition refers to.
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* @param <S>
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* The type of server managed object configuration that this
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* relation definition refers to.
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*/
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public abstract class RelationDefinition
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<C extends ConfigurationClient, S extends Configuration> {
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// The name of the relation.
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private final String name;
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// The definition of the parent managed object.
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private final AbstractManagedObjectDefinition<?, ?> pd;
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// The definition of the child managed object.
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private final AbstractManagedObjectDefinition<C, S> cd;
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/**
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* Create a new managed object relation definition with the specified name and
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* referenced managed object definition.
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*
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* @param pd
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* The parent managed object definition.
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* @param name
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* The name of the relation.
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* @param cd
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* The child managed object definition.
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*/
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protected RelationDefinition(AbstractManagedObjectDefinition<?, ?> pd,
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String name, AbstractManagedObjectDefinition<C, S> cd) {
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this.name = name;
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this.pd = pd;
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this.cd = cd;
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}
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/**
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* Get the name of the relation.
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*
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* @return Returns the name of the relation.
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*/
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public final String getName() {
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return name;
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}
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/**
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* Get the definition of the parent managed object.
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*
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* @return Returns the definition of the parent managed object.
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*/
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public final AbstractManagedObjectDefinition<?, ?> getParentDefinition() {
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return pd;
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}
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/**
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* Get the definition of the child managed object.
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*
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* @return Returns the definition of the child managed object.
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*/
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public final AbstractManagedObjectDefinition<C, S> getChildDefinition() {
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return cd;
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}
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/**
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* {@inheritDoc}
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*/
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@Override
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public final String toString() {
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StringBuilder builder = new StringBuilder();
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toString(builder);
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return builder.toString();
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}
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/**
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* Append a string representation of the managed object relation to the
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* provided string builder.
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*
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* @param builder
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* The string builder where the string representation should be
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* appended.
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*/
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public abstract void toString(StringBuilder builder);
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/**
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* Apply a visitor to this relation definition.
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*
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* @param <R>
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* The return type of the visitor's methods.
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* @param <P>
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* The type of the additional parameters to the visitor's
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* methods.
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* @param v
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* The relation definition visitor.
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* @param p
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* Optional additional visitor parameter.
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* @return Returns a result as specified by the visitor.
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*/
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public abstract <R, P> R accept(RelationDefinitionVisitor<R, P> v,
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P p);
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}
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