001 /* 002 $Id: PropertyExpression.java,v 1.6 2005/04/08 14:41:27 phk Exp $ 003 004 Copyright 2003 (C) James Strachan and Bob Mcwhirter. All Rights Reserved. 005 006 Redistribution and use of this software and associated documentation 007 ("Software"), with or without modification, are permitted provided 008 that the following conditions are met: 009 010 1. Redistributions of source code must retain copyright 011 statements and notices. Redistributions must also contain a 012 copy of this document. 013 014 2. Redistributions in binary form must reproduce the 015 above copyright notice, this list of conditions and the 016 following disclaimer in the documentation and/or other 017 materials provided with the distribution. 018 019 3. The name "groovy" must not be used to endorse or promote 020 products derived from this Software without prior written 021 permission of The Codehaus. For written permission, 022 please contact info@codehaus.org. 023 024 4. Products derived from this Software may not be called "groovy" 025 nor may "groovy" appear in their names without prior written 026 permission of The Codehaus. "groovy" is a registered 027 trademark of The Codehaus. 028 029 5. Due credit should be given to The Codehaus - 030 http://groovy.codehaus.org/ 031 032 THIS SOFTWARE IS PROVIDED BY THE CODEHAUS AND CONTRIBUTORS 033 ``AS IS'' AND ANY EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT 034 NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND 035 FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL 036 THE CODEHAUS OR ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, 037 INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES 038 (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR 039 SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 040 HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, 041 STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 042 ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED 043 OF THE POSSIBILITY OF SUCH DAMAGE. 044 045 */ 046 package org.codehaus.groovy.ast.expr; 047 048 import java.lang.reflect.Field; 049 import java.lang.reflect.Method; 050 import java.lang.reflect.Modifier; 051 052 import org.codehaus.groovy.ast.GroovyCodeVisitor; 053 import org.codehaus.groovy.classgen.AsmClassGenerator; 054 055 /** 056 * Represents a property access such as the expression "foo.bar". 057 * 058 * @author <a href="mailto:james@coredevelopers.net">James Strachan</a> 059 * @version $Revision: 1.6 $ 060 */ 061 public class PropertyExpression extends Expression { 062 063 private Expression objectExpression; 064 private String property; 065 private boolean spreadSafe = false; 066 private boolean safe = false; 067 private boolean isStatic = false; 068 069 private Method getter = null; 070 private Method setter = null; 071 072 private Field field = null; 073 private int access = -1; 074 075 public boolean isStatic() { 076 return isStatic; 077 } 078 079 public PropertyExpression(Expression objectExpression, String property) { 080 this(objectExpression, property, false); 081 } 082 083 public PropertyExpression(Expression objectExpression, String property, boolean safe) { 084 this.objectExpression = objectExpression; 085 this.property = property; 086 this.safe = safe; 087 } 088 089 public void visit(GroovyCodeVisitor visitor) { 090 visitor.visitPropertyExpression(this); 091 } 092 093 public boolean isDynamic() { 094 return true; 095 } 096 097 public Expression transformExpression(ExpressionTransformer transformer) { 098 return this; 099 } 100 101 protected void resolveType(AsmClassGenerator resolver) { 102 objectExpression.resolve(resolver); 103 resolver.resolve(this); 104 } 105 106 public Expression getObjectExpression() { 107 return objectExpression; 108 } 109 110 public String getProperty() { 111 return property; 112 } 113 114 public String getText() { 115 return objectExpression.getText() + "." + property; 116 } 117 118 /** 119 * @return is this a safe navigation, i.e. if true then if the source object is null 120 * then this navigation will return null 121 */ 122 public boolean isSafe() { 123 return safe; 124 } 125 126 public boolean isSpreadSafe() { 127 return spreadSafe; 128 } 129 130 public void setSpreadSafe(boolean value) { 131 spreadSafe = value; 132 } 133 134 public String toString() { 135 return super.toString() + "[object: " + objectExpression + " property: " + property + "]"; 136 } 137 138 public void setStatic(boolean aStatic) { 139 this.isStatic = aStatic; 140 } 141 142 public void setGetter(Method meth) { 143 Class returntype = meth.getReturnType(); 144 Class oldType = getTypeClass(); 145 if (oldType != null && oldType != Object.class && oldType != returntype) { 146 // something is wrong 147 // in this rare case the getter is discarded. Field access takes over 148 // String msg = "PropertyExpression.setSetter(): type mismatch: was " + getTypeClass() + 149 // ". now " + returntype; 150 // System.err.println(msg); 151 // setResolveFailed(true); 152 // setFailure(msg); 153 } 154 else { 155 getter = meth; 156 setTypeClass(returntype); 157 setTypeResolved(true); 158 } 159 } 160 161 public Method getGetter() { 162 return getter; 163 } 164 165 public void setSetter(Method method) { 166 Class paramType = method.getParameterTypes()[0]; 167 Class wasType = getTypeClass(); 168 if (wasType != null && wasType != Object.class && wasType != paramType) { 169 // // something is wrong 170 // in this rare case the getter is discarded. Field access takes over 171 // String msg = "PropertyExpression.setSetter(): type mismatch: was " + getTypeClass() + 172 // ". now " + paramType; 173 // System.err.println(msg); 174 // setResolveFailed(true); 175 // setFailure(msg); 176 } 177 else { 178 setter = method; 179 setTypeClass(paramType); 180 setTypeResolved(true); 181 } 182 } 183 public Method getSetter() { 184 return setter; 185 } 186 187 public void setField(Field fld) { 188 field = fld; 189 setStatic(Modifier.isStatic(fld.getModifiers())); 190 setTypeClass(fld.getType()); 191 } 192 public Field getField() { 193 return field; 194 } 195 196 public void setAccess(int access) { 197 this.access = access; 198 } 199 200 public int getAccess() { 201 return access; 202 } 203 }