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 /**
25 * Base class for boolean expressions.
26 *
27 * @author jkuhnert
28 */
29 public abstract class BooleanExpression
30 extends ExpressionNode
31 implements NodeType
32 {
33
34 private static final long serialVersionUID = 8630306635724834872L;
35
36 protected Class<?> getterClass;
37
38 public BooleanExpression( int id )
39 {
40 super( id );
41 }
42
43 public BooleanExpression( OgnlParser p, int id )
44 {
45 super( p, id );
46 }
47
48 /**
49 * {@inheritDoc}
50 */
51 public Class<?> getGetterClass()
52 {
53 return getterClass;
54 }
55
56 /**
57 * {@inheritDoc}
58 */
59 public Class<?> getSetterClass()
60 {
61 return null;
62 }
63
64 /**
65 * {@inheritDoc}
66 */
67 @Override
68 public String toGetSourceString( OgnlContext context, Object target )
69 {
70 try
71 {
72
73 Object value = getValueBody( context, target );
74
75 if ( value != null && Boolean.class.isAssignableFrom( value.getClass() ) )
76 {
77 getterClass = Boolean.TYPE;
78 }
79 else if ( value != null )
80 {
81 getterClass = value.getClass();
82 }
83 else
84 {
85 getterClass = Boolean.TYPE;
86 }
87
88 String ret = super.toGetSourceString( context, target );
89
90 if ( "(false)".equals( ret ) )
91 {
92 return "false";
93 }
94 else if ( "(true)".equals( ret ) )
95 {
96 return "true";
97 }
98 return ret;
99
100 }
101 catch ( NullPointerException e )
102 {
103
104 // expected to happen in some instances
105 e.printStackTrace();
106
107 throw new UnsupportedCompilationException( "evaluation resulted in null expression." );
108 }
109 catch ( Throwable t )
110 {
111 throw OgnlOps.castToRuntime( t );
112 }
113 }
114 }