001 /*
002 $Id: PropertyExpression.java 4287 2006-12-01 13:00:13Z blackdrag $
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.ClassHelper;
053 import org.codehaus.groovy.ast.GroovyCodeVisitor;
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: 4287 $
060 */
061 public class PropertyExpression extends Expression {
062
063 private Expression objectExpression;
064 private Expression 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 private boolean implicitThis = false;
075
076 public boolean isStatic() {
077 return isStatic;
078 }
079
080 public PropertyExpression(Expression objectExpression, String property) {
081 this(objectExpression, new ConstantExpression(property), false);
082 }
083
084 public PropertyExpression(Expression objectExpression, Expression property) {
085 this(objectExpression, property, false);
086 }
087
088 public PropertyExpression(Expression objectExpression, Expression property, boolean safe) {
089 this.objectExpression = objectExpression;
090 this.property = property;
091 this.safe = safe;
092 }
093
094 public void visit(GroovyCodeVisitor visitor) {
095 visitor.visitPropertyExpression(this);
096 }
097
098 public boolean isDynamic() {
099 return true;
100 }
101
102 public Expression transformExpression(ExpressionTransformer transformer) {
103 return this;
104 }
105
106 public Expression getObjectExpression() {
107 return objectExpression;
108 }
109
110 public void setObjectExpression(Expression exp) {
111 objectExpression=exp;
112 }
113
114 public Expression getProperty() {
115 return property;
116 }
117
118 public String getPropertyAsString() {
119 if (property==null) return null;
120 if (! (property instanceof ConstantExpression)) return null;
121 ConstantExpression constant = (ConstantExpression) property;
122 return constant.getText();
123 }
124
125 public String getText() {
126 return objectExpression.getText() + "." + property.getText();
127 }
128
129 /**
130 * @return is this a safe navigation, i.e. if true then if the source object is null
131 * then this navigation will return null
132 */
133 public boolean isSafe() {
134 return safe;
135 }
136
137 public boolean isSpreadSafe() {
138 return spreadSafe;
139 }
140
141 public void setSpreadSafe(boolean value) {
142 spreadSafe = value;
143 }
144
145 public String toString() {
146 return super.toString() + "[object: " + objectExpression + " property: " + property + "]";
147 }
148
149 public void setStatic(boolean aStatic) {
150 this.isStatic = aStatic;
151 }
152
153 public Method getGetter() {
154 return getter;
155 }
156
157 public Method getSetter() {
158 return setter;
159 }
160
161 public void setField(Field fld) {
162 field = fld;
163 setStatic(Modifier.isStatic(fld.getModifiers()));
164 setType(ClassHelper.make(fld.getType()));
165 }
166
167 public Field getField() {
168 return field;
169 }
170
171 public void setAccess(int access) {
172 this.access = access;
173 }
174
175 public int getAccess() {
176 return access;
177 }
178
179 public boolean isImplicitThis(){
180 return implicitThis;
181 }
182
183 public void setImplicitThis(boolean it) {
184 implicitThis = it;
185 }
186 }