001 /*
002 $Id: MethodPointerExpression.java,v 1.3 2005/06/10 09:55:29 cstein 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 groovy.lang.Closure;
049
050 import org.codehaus.groovy.ast.GroovyCodeVisitor;
051 import org.codehaus.groovy.classgen.AsmClassGenerator;
052
053 /**
054 * Represents a method pointer on an object such as
055 * foo.&bar which means find the method pointer on foo for the method called "bar"
056 * which is equivalent to
057 * <code>
058 * foo.metaClass.getMethodPointer(foo, "bar")
059 *
060 * @version $Revision: 1.3 $
061 */
062 public class MethodPointerExpression extends Expression {
063
064 private Expression expression;
065 private String methodName;
066
067 public MethodPointerExpression(Expression expression, String methodName) {
068 this.expression = expression;
069 this.methodName = methodName;
070 }
071
072 public Expression getExpression() {
073 if (expression == null)
074 return VariableExpression.THIS_EXPRESSION;
075 else
076 return expression;
077 }
078
079 public String getMethodName() {
080 return methodName;
081 }
082
083 public void visit(GroovyCodeVisitor visitor) {
084 visitor.visitMethodPointerExpression(this);
085 }
086
087 public Expression transformExpression(ExpressionTransformer transformer) {
088 if (expression == null)
089 return new MethodPointerExpression(VariableExpression.THIS_EXPRESSION, methodName);
090 else
091 return new MethodPointerExpression(transformer.transform(expression), methodName);
092 }
093
094 protected void resolveType(AsmClassGenerator resolver) {
095 if (expression != null) {
096 expression.resolve(resolver);
097 setTypeClass(expression.getTypeClass());
098 }
099 }
100
101 public String getText() {
102 if (expression == null)
103 return "&" + methodName;
104 else
105 return expression.getText() + ".&" + methodName;
106 }
107
108 public String getType() {
109 return "groovy.lang.Closure";
110 }
111
112 public boolean isDynamic() {
113 return false;
114 }
115
116 public Class getTypeClass() {
117 return Closure.class;
118 }
119 }