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: ASTNot.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 ASTNot
28 extends BooleanExpression
29 {
30 public ASTNot( int id )
31 {
32 super( id );
33 }
34
35 public ASTNot( 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.booleanValue( children[0].getValue( context, source ) ) ? Boolean.FALSE : Boolean.TRUE;
44 }
45
46 public String getExpressionOperator( int index )
47 {
48 return "!";
49 }
50
51 public String toGetSourceString( OgnlContext context, Object target )
52 {
53 try
54 {
55
56 String srcString = super.toGetSourceString( context, target );
57
58 if ( srcString == null || srcString.trim().length() < 1 )
59 {
60 srcString = "null";
61 }
62
63 context.setCurrentType( Boolean.TYPE );
64
65 return "(! org.apache.commons.ognl.OgnlOps.booleanValue(" + srcString + ") )";
66
67 }
68 catch ( Throwable t )
69 {
70 throw OgnlOps.castToRuntime( t );
71 }
72 }
73
74 public <R, P> R accept( NodeVisitor<? extends R, ? super P> visitor, P data )
75 throws OgnlException
76 {
77 return visitor.visit( this, data );
78 }
79 }