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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: ASTNegate.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  class ASTNegate
28      extends NumericExpression
29  {
30      public ASTNegate( int id )
31      {
32          super( id );
33      }
34  
35      public ASTNegate( OgnlParser p, int id )
36      {
37          super( p, id );
38      }
39  
40      protected Object getValueBody( OgnlContext context, Object source )
41          throws OgnlException
42      {
43          return OgnlOps.negate( children[0].getValue( context, source ) );
44      }
45  
46      public String toGetSourceString( OgnlContext context, Object target )
47      {
48          String source = children[0].toGetSourceString( context, target );
49  
50          if ( !ASTNegate.class.isInstance( children[0] ) )
51          {
52              return "-" + source;
53          }
54          else
55          {
56              return "-(" + source + ")";
57          }
58      }
59      
60      public <R, P> R accept( NodeVisitor<? extends R, ? super P> visitor, P data )
61          throws OgnlException
62      {
63          return visitor.visit( this, data );
64      }
65  }