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Public API for the Apache MyFaces Trinidad project
There is a newer version: 2.2.1
/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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 org.apache.myfaces.trinidad.context;

import java.util.Iterator;

import javax.faces.component.visit.VisitContext;


/**
 * Context object which is used to track the targets of a partial
 * page render during the Render Response phase.
 * Clients never need to explicitly create PartialPageContext
 * objects, but can retrieve them from a RenderingContext instance.
 * For general access to Partial Page Rendering during all phases,
 * see APIs on the RequestContext API.
 * 
 * During the partial rendering pass, some Renderer implementations
 * may modify the set of partial targets that are rendered.
 * (For example, the FormRenderer adds a partial target for its
 * shared hidden fields.)
 *
 * @version $Name:  $ ($Revision: adfrt/faces/adf-faces-impl/src/main/java/oracle/adfinternal/view/faces/renderkit/core/ppr/PartialPageContext.java#0 $) $Date: 10-nov-2005.19:02:58 $
 */
// TODO why is this an abstract class and not an interface?
abstract public class PartialPageContext
{
  protected PartialPageContext()
  {
  }

  /**
   * Tests whether the specified client id is the client id of a UIComponent that
   * should be rendered as part of the partial rendering pass.
   * @return true if a compoennt with this client id should be rendered.
   * @see #isPossiblePartialTarget
   */
  abstract public boolean isPartialTarget(String clientId);

  /**
   * 

   * Tests whether the specified component id is a component id of a UIComponent that
   * might be rendered in this partial rendering pass.
   * 
   * 
   * As calculating clientIds is expensive, this method allows a cheap test to reject components
   * that shouldn't be rendered. If this method returns true, a more
   * exact test using isPartialTarget with the desired clientId should be performed.
   * 
   * @return true if a component with this id should be rendered.
   * @see #isPartialTarget
   */
  abstract public boolean isPossiblePartialTarget(String componentId);

  /**
   * Returns true if all of the partial targets have been rendered.
   * @return true if all of the partial targets have been rendered.
   */
  public abstract boolean areAllTargetsProcessed();

  /**
   * Returns the set of partial targets for this rendering pass.
   */
  abstract public Iterator getPartialTargets();

  /**
   * Tests whether the specified partial target has been rendered.
   */
  abstract public boolean isPartialTargetRendered(String id);

  /**
   * Adds a new partial target to render.
   * 
   * This method may be called during the partial rendering pass to
   * add to the set of partial targets, but only if the pass has
   * not yet been completed.
   * @param id The id of the partial target to render
   */
  abstract public void addPartialTarget(String id);

  /**
   * Returns true if we are inside of a partial target.
   */
  abstract public boolean isInsidePartialTarget();

  /**
   * Adds a partial target that has already been rendered;  this
   * is needed if the "clientId" of a component does not match
   * up to the top element (or elements).
   */
  abstract public void addRenderedPartialTarget(String id);

  /**
   * Returns the client ids of the partial targets that have been rendered so far.
   * @return the client ids of the partial targets that have been rendered so far.
   */
  abstract public Iterator getRenderedPartialTargets();

  /**
   * Returns the VisitContext to use when partial rendering.
   * @return the VisitContext to use when partial rendering.
   */
  abstract public VisitContext getVisitContext();
}