/*
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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 legal-notices/CDDLv1_0.txt
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* or http://forgerock.org/license/CDDLv1.0.html.
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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 legal-notices/CDDLv1_0.txt.
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* If applicable, add the following below this CDDL HEADER, with the
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* fields enclosed by brackets "[]" replaced with your own identifying
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* 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.forgerock.opendj.config;
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/**
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* An interface for determining the default behavior of a property. A property
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* exhibits default behavior when it has no values defined. There are four
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* different types of default behavior:
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* <ol>
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* <li>there is no default behavior - e.g. leaving a "description" unset has no
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* side-effects. This default behavior is represented using the
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* {@link UndefinedDefaultBehaviorProvider} implementation
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* <li>the property defaults to one or more real values of the property. This
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* default behavior is represented using the
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* {@link DefinedDefaultBehaviorProvider} implementation
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* <li>the property defaults to some special behavior that cannot be represented
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* using real property values. This default behavior is represented using the
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* {@link AliasDefaultBehaviorProvider} implementation
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* <li>the property inherits its values from property held in another managed
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* object (e.g. the parent managed object). This default behavior is represented
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* using the {@link AbsoluteInheritedDefaultBehaviorProvider} and
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* {@link RelativeInheritedDefaultBehaviorProvider} implementations.
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* </ol>
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* An application can perform actions based on the type of the default behavior
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* by implementing the {@link DefaultBehaviorProviderVisitor} interface.
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*
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* @param <T>
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* The type of values represented by this provider.
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*/
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public abstract class DefaultBehaviorProvider<T> {
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/**
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* Creates a new default behavior provider.
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*/
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protected DefaultBehaviorProvider() {
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// No implementation required.
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}
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/**
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* Apply a visitor to this default behavior provider.
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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 default behavior 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(DefaultBehaviorProviderVisitor<T, R, P> v, P p);
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/**
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* Performs any run-time initialization required by this default behavior
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* provider. This may include resolving managed object paths and property
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* names.
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* <p>
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* The default implementation is to do nothing.
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*
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* @throws Exception
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* If this default behavior provider 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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