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/*
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
*
* Copyright (c) 1997-2010 Oracle and/or its affiliates. All rights reserved.
*
* The contents of this file are subject to the terms of either the GNU
* General Public License Version 2 only ("GPL") or the Common Development
* and Distribution License("CDDL") (collectively, the "License"). You
* may not use this file except in compliance with the License. You can
* obtain a copy of the License at
* https://glassfish.dev.java.net/public/CDDL+GPL_1_1.html
* or packager/legal/LICENSE.txt. See the License for the specific
* language governing permissions and limitations under the License.
*
* When distributing the software, include this License Header Notice in each
* file and include the License file at packager/legal/LICENSE.txt.
*
* GPL Classpath Exception:
* Oracle designates this particular file as subject to the "Classpath"
* exception as provided by Oracle in the GPL Version 2 section of the License
* file that accompanied this code.
*
* Modifications:
* If applicable, add the following below the License Header, with the fields
* enclosed by brackets [] replaced by your own identifying information:
* "Portions Copyright [year] [name of copyright owner]"
*
* Contributor(s):
* If you wish your version of this file to be governed by only the CDDL or
* only the GPL Version 2, indicate your decision by adding "[Contributor]
* elects to include this software in this distribution under the [CDDL or GPL
* Version 2] license." If you don't indicate a single choice of license, a
* recipient has the option to distribute your version of this file under
* either the CDDL, the GPL Version 2 or to extend the choice of license to
* its licensees as provided above. However, if you add GPL Version 2 code
* and therefore, elected the GPL Version 2 license, then the option applies
* only if the new code is made subject to such option by the copyright
* holder.
*
*
* This file incorporates work covered by the following copyright and
* permission notice:
*
* Copyright 2005-2007 The Apache Software Foundation
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package javax.faces.view.facelets;
/**
* <p class="changed_added_2_0">The root class of the abstraction that
* dictates how attributes on a markup element in a Facelets VDL page
* are wired to the JSF API object instance associated with that
* element. The single method on this interface, {@link #applyRule},
* returns an encapsulation of the behavior that actually does the work
* of handling the attribute and its value. There are implementations of
* specific concrete subclasses of this class for all the basic kinds of
* elements that appear in Facelets VDL pages: components,
* non-components, and attached objects.</p>
*
* <div class="changed_added_2_0">
* <p>For example, consider this markup:</p>
<code><pre><h:inputText value="#{user.userid}"
valueChangeListener="#{user.newUserId}" /></pre></code>
* Two <code>MetaRule</code> instances are involved in this example.</p>
* <ol>
*
* <li><p>The first has
* an <code>applyRule()</code> method that returns a {@link Metadata}
* instance that, when its <code>applyMetada()</code> method is called,
* dictates how the "value" attribute is processed: calling {@link
* javax.faces.component.UIComponent#setValueExpression} on the
* <code>UIComponent</code> instance associated with the
* <code><h:inputText></code> element.</p></li>
* <li><p>The second has an <code>applyRule()</code> method that returns
* a {@link Metadata} instance that, when its
* <code>applyMetadata()</code> method is called, dictates how the
* "valueChangeListener" attribute is processed: calling {@link
* javax.faces.component.EditableValueHolder#addValueChangeListener}.</p></li>
* </ol>
* </div>
*
* @since 2.0
*/
public abstract class MetaRule {
/**
* <p class="changed_added_2_0">Return an abstraction that takes
* appropriate action given the kind of rule represented by the
* argument <code>name</code>, in the context of this particular
* concrete subclass of <code>MetaRule</code>. The abstraction must
* encapsulate the value from the argument
* <code>attribute</code>.</p>
* @since 2.0
* @param name the name for this rule. This will generally be the
* name of a tag attribute in the VDL.
* @param attribute the name/value pair for this attribute on this
* particular instance of an element in the page.
* @param meta the <code>MetadataTarged</code> that can be used to
* discern what kind of action to encapsulate within the abstraction
* to be returned.
*/
public abstract Metadata applyRule(String name, TagAttribute attribute,
MetadataTarget meta);
}
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