001    /*
002     $Id: VariableExpression.java,v 1.10 2005/04/12 11:15:34 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 org.codehaus.groovy.ast.GroovyCodeVisitor;
049    import org.codehaus.groovy.classgen.AsmClassGenerator;
050    import org.codehaus.groovy.classgen.BytecodeHelper;
051    
052    
053    /**
054     * Represents a local variable name, the simplest form of expression. e.g. "foo".
055     * 
056     * @author <a href="mailto:james@coredevelopers.net">James Strachan</a>
057     * @version $Revision: 1.10 $
058     */
059    public class VariableExpression extends Expression {
060    
061        public static final VariableExpression THIS_EXPRESSION = new VariableExpression("this", null);
062        public static final VariableExpression SUPER_EXPRESSION = new VariableExpression("super", null);
063    
064        private String variable;
065    
066        public VariableExpression(String variable, String type) {
067            this.variable = variable;
068            if (type == null || type.length() == 0) {
069                isDynamic = true;
070            }
071            else {
072                String boxedType = BytecodeHelper.getObjectTypeForPrimitive(type);
073    
074                super.setType(boxedType);  // todo delay setting until resolve()
075                isDynamic = false;
076            }
077        }
078    
079        public VariableExpression(String variable) {
080            this.variable = variable;
081        }
082    
083        public void visit(GroovyCodeVisitor visitor) {
084            visitor.visitVariableExpression(this);
085        }
086    
087        public Expression transformExpression(ExpressionTransformer transformer) {
088            return this;
089        }
090    
091        protected void resolveType(AsmClassGenerator resolver) {
092            resolver.resolve(this);
093        }
094    
095        public String getVariable() {
096            return variable;
097        }
098    
099        public String getText() {
100            return variable;
101        }
102    
103        public String getType() {
104            if (type == null) {
105                return "java.lang.Object";
106            }
107            return type;
108        }
109    
110        boolean isDynamic = true;
111        public boolean isDynamic() {
112            return isDynamic;
113        }
114    
115        /**
116         * @return true if this variable is dynamically typed
117         */
118        public String toString() {
119            return super.toString() + "[variable: " + variable + ((isDynamic()) ? "" : " type: " + type) + "]";
120        }
121    
122        public void setDynamic(boolean dynamic) {
123            isDynamic = dynamic;
124        }
125    }