/*
    * 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.tobago.event;
  
  import org.apache.myfaces.tobago.compat.FacesUtilsEL;
  
  import javax.el.ELContext;
  import javax.el.MethodExpression;
  import javax.faces.component.StateHolder;
  import javax.faces.context.FacesContext;
  
  
  public class MethodExpressionTreeExpansionListener implements TreeExpansionListener, StateHolder {
  
    private MethodExpression methodExpression;
  
    private boolean isTransient = false;
  
    public MethodExpressionTreeExpansionListener() {
    }
  
    public MethodExpressionTreeExpansionListener(MethodExpression methodExpression) {
      this.methodExpression = methodExpression;
    }
  
    public void treeExpanded(TreeExpansionEvent event) {
      FacesUtilsEL.invokeMethodExpression(FacesContext.getCurrentInstance(), methodExpression, event);
    }
  
    private ELContext elContext() {
      return FacesContext.getCurrentInstance().getELContext();
    }
  
    public void restoreState(FacesContext context, Object state) {
      methodExpression = (MethodExpression) state;
    }
  
    public Object saveState(FacesContext context) {
      return methodExpression;
    }
  
    public void setTransient(boolean newTransientValue) {
      isTransient = newTransientValue;
    }
  
    public boolean isTransient() {
      return isTransient;
    }
  }