/*
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* The contents of this file are subject to the terms of the Common Development and
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* Distribution License (the License). You may not use this file except in compliance with the
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* License.
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*
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* You can obtain a copy of the License at legal/CDDLv1.0.txt. See the License for the
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* specific language governing permission and limitations under the License.
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*
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* When distributing Covered Software, include this CDDL Header Notice in each file and include
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* the License file at legal/CDDLv1.0.txt. If applicable, add the following below the CDDL
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* Header, with the fields enclosed by brackets [] replaced by your own identifying
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* information: "Portions Copyright [year] [name of copyright owner]".
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*
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* Copyright 2008 Sun Microsystems, Inc.
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*/
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package org.forgerock.opendj.config;
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import java.util.Collection;
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import java.util.Collections;
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import org.forgerock.opendj.config.client.ClientConstraintHandler;
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import org.forgerock.opendj.config.server.ServerConstraintHandler;
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/**
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* An interface for enforcing constraints and dependencies between managed
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* objects and their properties. Constraints express relationships between
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* managed objects and their properties, for example:
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* <ul>
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* <li>referential integrity: where one managed object references another a
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* constraint can enforce referential integrity. The constraint can prevent
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* creation of references to non-existent managed objects, and also prevent
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* deletion of referenced managed objects
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* <li>property dependencies: for example, when a boolean property is
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* <code>true</code>, one or more additional properties must be specified. This
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* is useful for features like SSL, which when enabled, requires that various
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* SSL related configuration options are specified
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* <li>property constraints: for example, when an upper limit property must not
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* have a value which is less than the lower limit property.
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* </ul>
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* On the client-side constraints are enforced immediately before a write
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* operation is performed. That is to say, immediately before a new managed
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* object is created, changes to a managed object are applied, or an existing
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* managed object is deleted.
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*/
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public abstract class Constraint {
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/**
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* Creates a new constraint.
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*/
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protected Constraint() {
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// No implementation required.
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}
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/**
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* Gets the client-side constraint handlers which will be used to enforce
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* this constraint in client applications. The default implementation is to
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* return an empty set of client constraint handlers.
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*
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* @return Returns the client-side constraint handlers which will be used to
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* enforce this constraint in client applications. The returned
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* collection must not be <code>null</code> but maybe empty
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* (indicating that the constraint can only be enforced on the
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* server-side).
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*/
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public Collection<ClientConstraintHandler> getClientConstraintHandlers() {
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return Collections.emptySet();
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}
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/**
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* Gets the server-side constraint handlers which will be used to enforce
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* this constraint within the server. The default implementation is to
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* return an empty set of server constraint handlers.
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*
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* @return Returns the server-side constraint handlers which will be used to
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* enforce this constraint within the server. The returned
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* collection must not be <code>null</code> and must not be empty,
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* since constraints must always be enforced on the server.
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*/
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public Collection<ServerConstraintHandler> getServerConstraintHandlers() {
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return Collections.emptySet();
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}
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/**
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* Initializes this constraint. The default implementation is to do nothing.
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*
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* @throws Exception
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* If this constraint could not be initialized.
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*/
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protected void initialize() throws Exception {
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// Default implementation is to do nothing.
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}
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}
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