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 }