org.apache.myfaces.trinidad.component.html.HtmlHead Maven / Gradle / Ivy

Show more of this group Show more artifacts with this name
Show all versions of trinidad-api Show documentation
Public API for the Apache MyFaces Trinidad project
There is a newer version: 2.2.1
// WARNING: This file was automatically generated. Do not edit it directly,
//          or you will lose your changes.

/*
 * 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.component.html;

import java.util.ArrayDeque;
import java.util.Collections;
import java.util.Map;
import java.util.Queue;
import javax.faces.context.FacesContext;
import org.apache.myfaces.trinidad.bean.FacesBean;
import org.apache.myfaces.trinidad.bean.PropertyKey;
import org.apache.myfaces.trinidad.component.UIXComponentBase;
import org.apache.myfaces.trinidad.context.ComponentContextManager;
import org.apache.myfaces.trinidad.context.RequestContext;
import org.apache.myfaces.trinidad.context.SuspendedContextChanges;
import org.apache.myfaces.trinidad.util.ComponentUtils;

/**
 *
 * 
 *             Tag for the HTML head element, including the
 *             document's title and any style sheets needed by th
 *             current look-and-feel.  Page authors
 *             that use this do not need to use a styleSheet component, as it
 *             will automatically be included.
 *           
 * 
 *   The head component resets the Trinidad EL context when code re-enters the component via
 *   an invoke on component call or a visit tree call. See the
 *   org.apache.myfaces.trinidad.context.ComponentContextManager for more information.
 * 
 *
 * Events:
 * 
 * 
 * 
 * 
 * 
 * 
 * 
 * 
 * 
 * 
 * 
 * Type Phases Description
org.apache.myfaces.trinidad.event.AttributeChangeEvent Invoke
Application
Apply
Request
Values Event delivered to describe an attribute change.  Attribute change events are not delivered for any programmatic change to a property.  They are only delivered when a renderer changes a property without the application's specific request.  An example of an attribute change event might include the width of a column that supported client-side resizing.
 */
public class HtmlHead extends UIXComponentBase
{
  static public final FacesBean.Type TYPE = new FacesBean.Type(
    UIXComponentBase.TYPE);
  static public final PropertyKey TITLE_KEY =
    TYPE.registerKey("title", String.class);
  static public final PropertyKey PARTIAL_TRIGGERS_KEY =
    TYPE.registerKey("partialTriggers", String[].class, null, 0, PropertyKey.Mutable.RARELY);

  static public final String COMPONENT_FAMILY =
    "org.apache.myfaces.trinidad.Head";
  static public final String COMPONENT_TYPE =
    "org.apache.myfaces.trinidad.HtmlHead";

  /**
   * Construct an instance of the HtmlHead.
   */
  public HtmlHead()
  {
    super("org.apache.myfaces.trinidad.Head");
  }
    /**
   * Suspends any context changes before allowing invokeOnComponent or visitTree calls to continue,
   * allowing components to undo any context changes during a re-entrant call.
   * @param facesContext the faces context
   * @see ComponentContextManager#suspend(FacesContext)
   */
  @Override
  protected void setupVisitingContext(FacesContext facesContext)
  {
    ComponentContextManager ctxMgr = RequestContext.getCurrentInstance()
      .getComponentContextManager();

    // Suspend any current component context during a visit tree for re-entrant
    // component tree processing
    SuspendedContextChanges suspendedChanges = ctxMgr.suspend(facesContext);

    Map reqMap = facesContext.getExternalContext().getRequestMap();
    @SuppressWarnings("unchecked")
    Queue suspendedChangesQueue = (Queue)
      reqMap.get(_SUSPENDED_CHANGES_KEY);
    if (suspendedChangesQueue == null)
    {
      suspendedChangesQueue = Collections.asLifoQueue(new ArrayDeque());
      reqMap.put(_SUSPENDED_CHANGES_KEY, suspendedChangesQueue);
    }

    suspendedChangesQueue.offer(suspendedChanges);

    super.setupVisitingContext(facesContext);
  }

  /**
   * Re-applies the suspended context changes.
   * @param facesContext the faces context
   * @see #setupVisitingContext(FacesContext)
   * @see ComponentContextManager#resume(FacesContext, SuspendedContextChanges)
   */
  @Override
  protected void tearDownVisitingContext(FacesContext facesContext)
  {
    super.tearDownVisitingContext(facesContext);

    ComponentContextManager ctxMgr = RequestContext.getCurrentInstance()
      .getComponentContextManager();
    Map reqMap = facesContext.getExternalContext().getRequestMap();
    @SuppressWarnings("unchecked")
    Queue suspendedChangesQueue = (Queue)
      reqMap.get(_SUSPENDED_CHANGES_KEY);
    SuspendedContextChanges changes = suspendedChangesQueue.poll();
    ctxMgr.resume(facesContext, changes);
  }

  private final static String _SUSPENDED_CHANGES_KEY = HtmlHead.class.getName() +
                                                       ".SUSPENDED_CHANGES";

  /**
   * Gets The title of the document.  (This title doesn't have to match the
   *             title on any contained panelPage.)
   *
   * @return  the new title value
   */
  final public String getTitle()
  {
    return ComponentUtils.resolveString(getProperty(TITLE_KEY));
  }

  /**
   * Sets The title of the document.  (This title doesn't have to match the
   *             title on any contained panelPage.)
   * 
   * @param title  the new title value
   */
  final public void setTitle(String title)
  {
    setProperty(TITLE_KEY, (title));
  }

  /**
   * Gets the IDs of the components that should trigger a partial update.
   *          This component will listen on the trigger components. If one of the
   *          trigger components receives an event that will cause it to update
   *          in some way, this component will request to be updated too.
   *
   * @return  the new partialTriggers value
   */
  final public String[] getPartialTriggers()
  {
    return (String[])getProperty(PARTIAL_TRIGGERS_KEY);
  }

  /**
   * Sets the IDs of the components that should trigger a partial update.
   *          This component will listen on the trigger components. If one of the
   *          trigger components receives an event that will cause it to update
   *          in some way, this component will request to be updated too.
   * 
   * @param partialTriggers  the new partialTriggers value
   */
  final public void setPartialTriggers(String[] partialTriggers)
  {
    setProperty(PARTIAL_TRIGGERS_KEY, (partialTriggers));
  }

  @Override
  public String getFamily()
  {
    return COMPONENT_FAMILY;
  }

  @Override
  protected FacesBean.Type getBeanType()
  {
    return TYPE;
  }

  /**
   * Construct an instance of the HtmlHead.
   */
  protected HtmlHead(
    String rendererType
    )
  {
    super(rendererType);
  }

  static
  {
    TYPE.lockAndRegister("org.apache.myfaces.trinidad.Head","org.apache.myfaces.trinidad.Head");
  }
}