001 /*
002 $Id: MethodCallExpression.java,v 1.7 2005/04/08 17:57:07 phk 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.MetaMethod;
049
050 import org.codehaus.groovy.ast.GroovyCodeVisitor;
051 import org.codehaus.groovy.classgen.AsmClassGenerator;
052
053 /**
054 * A method call on an object or class
055 *
056 * @author <a href="mailto:james@coredevelopers.net">James Strachan</a>
057 * @version $Revision: 1.7 $
058 */
059 public class MethodCallExpression extends Expression {
060
061 private Expression objectExpression;
062 private String method;
063 private Expression arguments;
064 private boolean spreadSafe = false;
065 private boolean safe = false;
066 private boolean implicitThis;
067
068 public MetaMethod getMetaMethod() {
069 return metaMethod;
070 }
071
072 private MetaMethod metaMethod = null;
073
074 public MethodCallExpression(Expression objectExpression, String method, Expression arguments) {
075 this.objectExpression = objectExpression;
076 this.method = method;
077 this.arguments = arguments;
078 }
079
080 public void visit(GroovyCodeVisitor visitor) {
081 visitor.visitMethodCallExpression(this);
082 }
083
084 public Expression transformExpression(ExpressionTransformer transformer) {
085 MethodCallExpression answer =
086 new MethodCallExpression(transformer.transform(objectExpression), method, transformer.transform(arguments));
087 answer.setSafe(safe);
088 return answer;
089 }
090
091 protected void resolveType(AsmClassGenerator resolver) {
092 this.objectExpression.resolve(resolver);
093 this.arguments.resolve(resolver);
094 resolver.resolve(this);
095 }
096
097 public Expression getArguments() {
098 return arguments;
099 }
100
101 public String getMethod() {
102 return method;
103 }
104
105 public Expression getObjectExpression() {
106 return objectExpression;
107 }
108
109 public String getText() {
110 return objectExpression.getText() + "." + method + arguments.getText();
111 }
112
113 /**
114 * @return is this a safe method call, i.e. if true then if the source object is null
115 * then this method call will return null rather than throwing a null pointer exception
116 */
117 public boolean isSafe() {
118 return safe;
119 }
120
121 public void setSafe(boolean safe) {
122 this.safe = safe;
123 }
124
125 public boolean isSpreadSafe() {
126 return spreadSafe;
127 }
128
129 public void setSpreadSafe(boolean value) {
130 spreadSafe = value;
131 }
132
133 /**
134 * @return true if no object expression was specified otherwise if
135 * some expression was specified for the object on which to evaluate
136 * the method then return false
137 */
138 public boolean isImplicitThis() {
139 return implicitThis;
140 }
141
142 public void setImplicitThis(boolean implicitThis) {
143 this.implicitThis = implicitThis;
144 }
145
146 public String toString() {
147 return super.toString()
148 + "[object: "
149 + objectExpression
150 + " method: "
151 + method
152 + " arguments: "
153 + arguments
154 + "]";
155 }
156
157 public static boolean isSuperMethodCall(MethodCallExpression call) {
158 Expression expression = call.getObjectExpression();
159 if (expression instanceof VariableExpression) {
160 VariableExpression varExp = (VariableExpression) expression;
161 String variable = varExp.getVariable();
162 return variable.equals("super");
163 }
164 return false;
165 }
166
167 public void setMethod(MetaMethod mmeth) {
168 this.metaMethod = mmeth;
169 super.setTypeClass(mmeth.getReturnType());
170 }
171 }