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JSR-000344: JavaServer(TM) Faces 2.2 API
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/*
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 * Copyright 2005-2007 The Apache Software Foundation
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 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
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 *     http://www.apache.org/licenses/LICENSE-2.0
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package javax.faces.view.facelets;


/**
 * There are concrete subclasses within the
 * implementation that map concepts in the Facelet VDL page to JSF Java
 * API calls the appropriate instances.  For example, the
 * “validator” attribute on an input component
 * is specified to point to a MethodExpression that
 * references a method that performs the validation.  There is a
 * concrete subclass of Metadata to perform this action
 * when that attribute appears in a Facelet VDL page.
 *
 * @since 2.0
 */
public abstract class Metadata {

    /**
     * Take the action prescribed in the
     * JSF specification for this particular VDL element attribute.
     * 
     * @param ctx The FaceletContext for this request.
     * @param instance The instance from the JSF Java API on which the
     * action should be taken.  For example, an instance of {@link
     * javax.faces.component.EditableValueHolder}.
     */
    public abstract void applyMetadata(FaceletContext ctx, Object instance);

}