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1   /*
2    * Licensed to the Apache Software Foundation (ASF) under one
3    * or more contributor license agreements.  See the NOTICE file
4    * distributed with this work for additional information
5    * regarding copyright ownership.  The ASF licenses this file
6    * to you under the Apache License, Version 2.0 (the
7    * "License"); you may not use this file except in compliance
8    * with the License.  You may obtain a copy of the License at
9    *
10   *   http://www.apache.org/licenses/LICENSE-2.0
11   *
12   * Unless required by applicable law or agreed to in writing,
13   * software distributed under the License is distributed on an
14   * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
15   * KIND, either express or implied.  See the License for the
16   * specific language governing permissions and limitations
17   * under the License.
18   */
19  
20  package org.apache.myfaces.tobago.event;
21  
22  import org.apache.myfaces.tobago.compat.FacesUtilsEL;
23  
24  import javax.el.ELContext;
25  import javax.el.MethodExpression;
26  import javax.faces.component.StateHolder;
27  import javax.faces.context.FacesContext;
28  
29  
30  public class MethodExpressionTreeExpansionListener implements TreeExpansionListener, StateHolder {
31  
32    private MethodExpression methodExpression;
33  
34    private boolean isTransient = false;
35  
36    public MethodExpressionTreeExpansionListener() {
37    }
38  
39    public MethodExpressionTreeExpansionListener(final MethodExpression methodExpression) {
40      this.methodExpression = methodExpression;
41    }
42  
43    @Override
44    public void treeExpanded(final TreeExpansionEvent event) {
45      FacesUtilsEL.invokeMethodExpression(FacesContext.getCurrentInstance(), methodExpression, event);
46    }
47  
48    private ELContext elContext() {
49      return FacesContext.getCurrentInstance().getELContext();
50    }
51  
52    @Override
53    public void restoreState(final FacesContext context, final Object state) {
54      methodExpression = (MethodExpression) state;
55    }
56  
57    @Override
58    public Object saveState(final FacesContext context) {
59      return methodExpression;
60    }
61  
62    @Override
63    public void setTransient(final boolean newTransientValue) {
64      isTransient = newTransientValue;
65    }
66  
67    @Override
68    public boolean isTransient() {
69      return isTransient;
70    }
71  }