001    package org.apache.myfaces.tobago.event;
002    
003    /*
004     * Licensed to the Apache Software Foundation (ASF) under one or more
005     * contributor license agreements.  See the NOTICE file distributed with
006     * this work for additional information regarding copyright ownership.
007     * The ASF licenses this file to You under the Apache License, Version 2.0
008     * (the "License"); you may not use this file except in compliance with
009     * the License.  You may obtain a copy of the License at
010     *
011     *      http://www.apache.org/licenses/LICENSE-2.0
012     *
013     * Unless required by applicable law or agreed to in writing, software
014     * distributed under the License is distributed on an "AS IS" BASIS,
015     * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
016     * See the License for the specific language governing permissions and
017     * limitations under the License.
018     */
019    
020    import org.apache.myfaces.tobago.compat.FacesUtilsEL;
021    
022    import javax.el.ELContext;
023    import javax.el.MethodExpression;
024    import javax.faces.component.StateHolder;
025    import javax.faces.context.FacesContext;
026    
027    
028    public class MethodExpressionTreeExpansionListener implements TreeExpansionListener, StateHolder {
029    
030      private MethodExpression methodExpression;
031    
032      private boolean isTransient = false;
033    
034      public MethodExpressionTreeExpansionListener() {
035      }
036    
037      public MethodExpressionTreeExpansionListener(MethodExpression methodExpression) {
038        this.methodExpression = methodExpression;
039      }
040    
041      public void treeExpanded(TreeExpansionEvent event) {
042        FacesUtilsEL.invokeMethodExpression(FacesContext.getCurrentInstance(), methodExpression, event);
043      }
044    
045      private ELContext elContext() {
046        return FacesContext.getCurrentInstance().getELContext();
047      }
048    
049      public void restoreState(FacesContext context, Object state) {
050        methodExpression = (MethodExpression) state;
051      }
052    
053      public Object saveState(FacesContext context) {
054        return methodExpression;
055      }
056    
057      public void setTransient(boolean newTransientValue) {
058        isTransient = newTransientValue;
059      }
060    
061      public boolean isTransient() {
062        return isTransient;
063      }
064    }