/*
|
* The contents of this file are subject to the terms of the Common Development and
|
* Distribution License (the License). You may not use this file except in compliance with the
|
* License.
|
*
|
* You can obtain a copy of the License at legal/CDDLv1.0.txt. See the License for the
|
* specific language governing permission and limitations under the License.
|
*
|
* When distributing Covered Software, include this CDDL Header Notice in each file and include
|
* the License file at legal/CDDLv1.0.txt. If applicable, add the following below the CDDL
|
* Header, with the fields enclosed by brackets [] replaced by your own identifying
|
* information: "Portions Copyright [year] [name of copyright owner]".
|
*
|
* Copyright 2008 Sun Microsystems, Inc.
|
*/
|
package org.forgerock.opendj.config;
|
|
/**
|
* An interface for determining the default behavior of a property. A property
|
* exhibits default behavior when it has no values defined. There are four
|
* different types of default behavior:
|
* <ol>
|
* <li>there is no default behavior - e.g. leaving a "description" unset has no
|
* side-effects. This default behavior is represented using the
|
* {@link UndefinedDefaultBehaviorProvider} implementation
|
* <li>the property defaults to one or more real values of the property. This
|
* default behavior is represented using the
|
* {@link DefinedDefaultBehaviorProvider} implementation
|
* <li>the property defaults to some special behavior that cannot be represented
|
* using real property values. This default behavior is represented using the
|
* {@link AliasDefaultBehaviorProvider} implementation
|
* <li>the property inherits its values from property held in another managed
|
* object (e.g. the parent managed object). This default behavior is represented
|
* using the {@link AbsoluteInheritedDefaultBehaviorProvider} and
|
* {@link RelativeInheritedDefaultBehaviorProvider} implementations.
|
* </ol>
|
* An application can perform actions based on the type of the default behavior
|
* by implementing the {@link DefaultBehaviorProviderVisitor} interface.
|
*
|
* @param <T>
|
* The type of values represented by this provider.
|
*/
|
public abstract class DefaultBehaviorProvider<T> {
|
|
/**
|
* Creates a new default behavior provider.
|
*/
|
protected DefaultBehaviorProvider() {
|
// No implementation required.
|
}
|
|
/**
|
* Apply a visitor to this default behavior provider.
|
*
|
* @param <R>
|
* The return type of the visitor's methods.
|
* @param <P>
|
* The type of the additional parameters to the visitor's
|
* methods.
|
* @param v
|
* The default behavior visitor.
|
* @param p
|
* Optional additional visitor parameter.
|
* @return Returns a result as specified by the visitor.
|
*/
|
public abstract <R, P> R accept(DefaultBehaviorProviderVisitor<T, R, P> v, P p);
|
|
/**
|
* Performs any run-time initialization required by this default behavior
|
* provider. This may include resolving managed object paths and property
|
* names.
|
* <p>
|
* The default implementation is to do nothing.
|
*
|
* @throws Exception
|
* If this default behavior provider could not be initialized.
|
*/
|
protected void initialize() throws Exception {
|
// Default implementation is to do nothing.
|
}
|
|
}
|
