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    }