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1   package org.apache.commons.ognl;
2   
3   /*
4    * Licensed to the Apache Software Foundation (ASF) under one
5    * or more contributor license agreements.  See the NOTICE file
6    * distributed with this work for additional information
7    * regarding copyright ownership.  The ASF licenses this file
8    * to you under the Apache License, Version 2.0 (the
9    * "License"); you may not use this file except in compliance
10   * with the License.  You may obtain a copy of the License at
11   *
12   * http://www.apache.org/licenses/LICENSE-2.0
13   *
14   * Unless required by applicable law or agreed to in writing,
15   * software distributed under the License is distributed on an
16   * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
17   * KIND, either express or implied.  See the License for the
18   * specific language governing permissions and limitations
19   * under the License.
20   */
21  
22  /**
23   * $Id: ASTInstanceof.java 1194869 2011-10-29 11:10:16Z mcucchiara $
24   * @author Luke Blanshard (blanshlu@netscape.net)
25   * @author Drew Davidson (drew@ognl.org)
26   */
27  public class ASTInstanceof
28      extends SimpleNode
29      implements NodeType
30  {
31      private String targetType;
32  
33      public ASTInstanceof( int id )
34      {
35          super( id );
36      }
37  
38      public ASTInstanceof( OgnlParser p, int id )
39      {
40          super( p, id );
41      }
42  
43      void setTargetType( String targetType )
44      {
45          this.targetType = targetType;
46      }
47  
48      String getTargetType() 
49      {
50          return targetType;
51      }
52  
53      protected Object getValueBody( OgnlContext context, Object source )
54          throws OgnlException
55      {
56          Object value = children[0].getValue( context, source );
57          return OgnlRuntime.isInstance( context, value, targetType ) ? Boolean.TRUE : Boolean.FALSE;
58      }
59  
60      public Class getGetterClass()
61      {
62          return boolean.class;
63      }
64  
65      public Class getSetterClass()
66      {
67          return null;
68      }
69  
70      public String toGetSourceString( OgnlContext context, Object target )
71      {
72          try
73          {
74  
75              String ret = "";
76  
77              if ( ASTConst.class.isInstance( children[0] ) )
78              {
79                  ret = ( (Boolean) getValueBody( context, target ) ).toString();
80              }
81              else
82              {
83                  ret = children[0].toGetSourceString( context, target ) + " instanceof " + targetType;
84              }
85              context.setCurrentType( Boolean.TYPE );
86  
87              return ret;
88  
89          }
90          catch ( Throwable t )
91          {
92              throw OgnlOps.castToRuntime( t );
93          }
94      }
95  
96      public String toSetSourceString( OgnlContext context, Object target )
97      {
98          return toGetSourceString( context, target );
99      }
100     
101     public <R, P> R accept( NodeVisitor<? extends R, ? super P> visitor, P data )
102         throws OgnlException
103     {
104         return visitor.visit( this, data );
105     }
106 }