001    /*
002     $Id: PropertyExpression.java,v 1.8 2005/11/13 16:42:09 blackdrag 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.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: 1.8 $
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        public Expression getObjectExpression() {
102            return objectExpression;
103        }
104    
105        public void setObjectExpression(Expression exp) {
106            objectExpression=exp;
107        }    
108        
109        public String getProperty() {
110            return property;
111        }
112    
113        public String getText() {
114            return objectExpression.getText() + "." + property;
115        }
116    
117        /**
118         * @return is this a safe navigation, i.e. if true then if the source object is null
119         * then this navigation will return null
120         */
121        public boolean isSafe() {
122            return safe;
123        }
124    
125        public boolean isSpreadSafe() {
126            return spreadSafe;
127        }
128    
129        public void setSpreadSafe(boolean value) {
130            spreadSafe = value;
131        }
132    
133        public String toString() {
134            return super.toString() + "[object: " + objectExpression + " property: " + property + "]";
135        }
136    
137        public void setStatic(boolean aStatic) {
138            this.isStatic = aStatic;
139        }
140    
141        public Method getGetter() {
142            return getter;
143        }
144    
145        public Method getSetter() {
146            return setter;
147        }
148    
149        public void setField(Field fld) {
150            field = fld;
151            setStatic(Modifier.isStatic(fld.getModifiers()));
152            setType(ClassHelper.make(fld.getType()));
153        }
154        
155        public Field getField() {
156            return field;
157        }
158    
159        public void setAccess(int access) {
160            this.access = access;
161        }
162    
163        public int getAccess() {
164            return access;
165        }
166    }