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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  import org.apache.commons.ognl.enhance.UnsupportedCompilationException;
23  
24  import java.util.ArrayList;
25  import java.util.Enumeration;
26  import java.util.List;
27  
28  /**
29   * $Id: ASTSelect.java 1194869 2011-10-29 11:10:16Z mcucchiara $
30   * @author Luke Blanshard (blanshlu@netscape.net)
31   * @author Drew Davidson (drew@ognl.org)
32   */
33  class ASTSelect
34      extends SimpleNode
35  {
36  
37      public ASTSelect( int id )
38      {
39          super( id );
40      }
41  
42      public ASTSelect( OgnlParser p, int id )
43      {
44          super( p, id );
45      }
46  
47      protected Object getValueBody( OgnlContext context, Object source )
48          throws OgnlException
49      {
50          Node expr = children[0];
51          List answer = new ArrayList();
52  
53          ElementsAccessor elementsAccessor = OgnlRuntime.getElementsAccessor( OgnlRuntime.getTargetClass( source ) );
54  
55          for ( Enumeration e = elementsAccessor.getElements( source ); e.hasMoreElements(); )
56          {
57              Object next = e.nextElement();
58  
59              if ( OgnlOps.booleanValue( expr.getValue( context, next ) ) )
60              {
61                  answer.add( next );
62              }
63          }
64  
65          return answer;
66      }
67  
68      public String toGetSourceString( OgnlContext context, Object target )
69      {
70          throw new UnsupportedCompilationException( "Eval expressions not supported as native java yet." );
71      }
72  
73      public String toSetSourceString( OgnlContext context, Object target )
74      {
75          throw new UnsupportedCompilationException( "Eval expressions not supported as native java yet." );
76      }
77      
78      public <R, P> R accept( NodeVisitor<? extends R, ? super P> visitor, P data )
79          throws OgnlException
80      {
81          return visitor.visit( this, data );
82      }
83  }