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    }