/*
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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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* Copyright 2008 Sun Microsystems, Inc.
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*/
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package org.opends.server.admin;
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import java.util.Collection;
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import java.util.Collections;
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import org.opends.server.admin.client.ClientConstraintHandler;
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import org.opends.server.admin.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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