Examples of org.apache.myfaces.trinidad.context.ComponentContextManager

Package org.apache.myfaces.trinidad.context

Examples of org.apache.myfaces.trinidad.context.ComponentContextManager

org.apache.myfaces.trinidad.context.ComponentContextManager
Interface that controls access to the stack of component context changes. This class allows components to push changes onto a stack that must be rolled back in order to perform an {@link javax.faces.component.UIComponent#invokeOnComponent} or{@link javax.faces.component.UIComponent#visitTree} call in the proper context.
This functionality allows changes that only should apply when a component is currently processing its lifecycle to be temporarily suspended. For example, a component that alters the EL context should undo and changes when the component is not processing. An example of this is the Trinidad table that injects "var" and "varStatus" variables into the EL context while the table is iterating. By saving off these variables and restoring them, the EL will be correct should code perform an invoke on component or visit tree call, reentering the component tree from the view root.

    if (_inSuspendOrResume)
    {
      return;
    }


    ComponentContextManager compCtxMgr =
      RequestContext.getCurrentInstance().getComponentContextManager();
    ComponentContextChange change = compCtxMgr.peekChange();


    if (!(change instanceof CollectionComponentChange) ||
        ((CollectionComponentChange)change)._component != this)
    {
      _LOG.warning("COLLECTION_NOT_IN_CONTEXT", getId());

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        _handleInvalidContextUsage("COMPONENT_NOT_IN_CHILDREN_VISITING_CONTEXT",
          _tearDownChildrenVisitingCaller);
      }


      // Next, remove the context change that was added in setupChildrenVisitingContext:
      ComponentContextManager componentContextManager =
        RequestContext.getCurrentInstance().getComponentContextManager();


      ComponentContextChange contextChange = componentContextManager.popChange();
      // Validate the state of the context change stack:
      if (!(contextChange instanceof VisitChildrenDebugContextChange) ||
          ((VisitChildrenDebugContextChange)contextChange)._component != this)
      {
        throw new IllegalStateException(_getInvalidContextChangeMessage(

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   * @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<String, Object> reqMap = facesContext.getExternalContext().getRequestMap();
    @SuppressWarnings("unchecked")
    Queue<SuspendedContextChanges> suspendedChangesQueue = (Queue<SuspendedContextChanges>)
      reqMap.get(_SUSPENDED_CHANGES_KEY);

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  @Override
  protected void tearDownVisitingContext(FacesContext facesContext)
  {
    super.tearDownVisitingContext(facesContext);


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

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        _handleInvalidContextUsage("COMPONENT_ALREADY_IN_VISITING_CONTEXT", _setupVisitingCaller);
      }


      // Next, add a context change so that the flags are reset during an
      // invokeOnComponent(context, clientId, callback), or a visitTree call:
      ComponentContextManager componentContextManager =
        RequestContext.getCurrentInstance().getComponentContextManager();
      componentContextManager.pushChange(new VisitDebugContextChange(this));
      _inVisitingContext = true;
      _setupVisitingCaller = _getStackTraceElementForCaller();
    }
  }

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      // Next, add a context change so that the flags are reset during an
      // invokeOnComponent(context, clientId, callback), or a visitTree call
      // (Note that a separate one is needed for the children due to the fact that currently
      // the encoding context / visiting context is not set up during normal tree traversal,
      // but the children encoding context is setup by the renderers):
      ComponentContextManager componentContextManager =
        RequestContext.getCurrentInstance().getComponentContextManager();
      componentContextManager.pushChange(new VisitChildrenDebugContextChange(this));
      _inChildrenVisitingContext = true;
      _setupChildrenVisitingCaller = _getStackTraceElementForCaller();
    }
  }

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      {
        _handleInvalidContextUsage("COMPONENT_NOT_IN_VISITING_CONTEXT", _tearDownVisitingCaller);
      }


      // Next, remove the context change that was added in setupVisitingContext:
      ComponentContextManager componentContextManager =
        RequestContext.getCurrentInstance().getComponentContextManager();


      ComponentContextChange contextChange = componentContextManager.popChange();


      // Validate the state of the context change stack:
      if (!(contextChange instanceof VisitDebugContextChange) ||
          ((VisitDebugContextChange)contextChange)._component != this)
      {

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   * @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<String, Object> reqMap = facesContext.getExternalContext().getRequestMap();
    @SuppressWarnings("unchecked")
    Queue<SuspendedContextChanges> suspendedChangesQueue = (Queue<SuspendedContextChanges>)
      reqMap.get(_SUSPENDED_CHANGES_KEY);

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  @Override
  protected void tearDownVisitingContext(FacesContext facesContext)
  {
    super.tearDownVisitingContext(facesContext);


    ComponentContextManager ctxMgr = RequestContext.getCurrentInstance()
      .getComponentContextManager();
    Map<String, Object> reqMap = facesContext.getExternalContext().getRequestMap();
    @SuppressWarnings("unchecked")
    Queue<SuspendedContextChanges> suspendedChangesQueue = (Queue<SuspendedContextChanges>)
      reqMap.get(_SUSPENDED_CHANGES_KEY);
    SuspendedContextChanges changes = suspendedChangesQueue.poll();
    ctxMgr.resume(facesContext, changes);
    _LOG.fine("UIXDocument resumed context changes in setupVisitingContext");
  }

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   * @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<String, Object> reqMap = facesContext.getExternalContext().getRequestMap();
    @SuppressWarnings("unchecked")
    Queue<SuspendedContextChanges> suspendedChangesQueue = (Queue<SuspendedContextChanges>)
      reqMap.get(_SUSPENDED_CHANGES_KEY);

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