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 }