001 package org.apache.commons.ognl; 002 003 /* 004 * Licensed to the Apache Software Foundation (ASF) under one 005 * or more contributor license agreements. See the NOTICE file 006 * distributed with this work for additional information 007 * regarding copyright ownership. The ASF licenses this file 008 * to you under the Apache License, Version 2.0 (the 009 * "License"); you may not use this file except in compliance 010 * with the License. You may obtain a copy of the License at 011 * 012 * http://www.apache.org/licenses/LICENSE-2.0 013 * 014 * Unless required by applicable law or agreed to in writing, 015 * software distributed under the License is distributed on an 016 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY 017 * KIND, either express or implied. See the License for the 018 * specific language governing permissions and limitations 019 * under the License. 020 */ 021 022 import org.apache.commons.ognl.enhance.UnsupportedCompilationException; 023 024 /** 025 * Base class for boolean expressions. 026 * 027 * @author jkuhnert 028 */ 029 public abstract class BooleanExpression 030 extends ExpressionNode 031 implements NodeType 032 { 033 034 private static final long serialVersionUID = 8630306635724834872L; 035 036 protected Class<?> getterClass; 037 038 public BooleanExpression( int id ) 039 { 040 super( id ); 041 } 042 043 public BooleanExpression( OgnlParser p, int id ) 044 { 045 super( p, id ); 046 } 047 048 /** 049 * {@inheritDoc} 050 */ 051 public Class<?> getGetterClass() 052 { 053 return getterClass; 054 } 055 056 /** 057 * {@inheritDoc} 058 */ 059 public Class<?> getSetterClass() 060 { 061 return null; 062 } 063 064 /** 065 * {@inheritDoc} 066 */ 067 @Override 068 public String toGetSourceString( OgnlContext context, Object target ) 069 { 070 try 071 { 072 073 Object value = getValueBody( context, target ); 074 075 if ( value != null && Boolean.class.isAssignableFrom( value.getClass() ) ) 076 { 077 getterClass = Boolean.TYPE; 078 } 079 else if ( value != null ) 080 { 081 getterClass = value.getClass(); 082 } 083 else 084 { 085 getterClass = Boolean.TYPE; 086 } 087 088 String ret = super.toGetSourceString( context, target ); 089 090 if ( "(false)".equals( ret ) ) 091 { 092 return "false"; 093 } 094 else if ( "(true)".equals( ret ) ) 095 { 096 return "true"; 097 } 098 return ret; 099 100 } 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 }