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 }