001 /* 002 $Id: MethodCallExpression.java,v 1.9 2005/11/13 16:42:09 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 groovy.lang.MetaMethod; 049 050 import org.codehaus.groovy.ast.ClassHelper; 051 import org.codehaus.groovy.ast.GroovyCodeVisitor; 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: 1.9 $ 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 //TODO: set correct type here 079 // if setting type and a methodcall is the last expresssion in a method, 080 // then the method will return null if the method itself is not void too! 081 // (in bytecode after call: aconst_null, areturn) 082 this.setType(ClassHelper.DYNAMIC_TYPE); 083 } 084 085 public void visit(GroovyCodeVisitor visitor) { 086 visitor.visitMethodCallExpression(this); 087 } 088 089 public Expression transformExpression(ExpressionTransformer transformer) { 090 MethodCallExpression answer = 091 new MethodCallExpression(transformer.transform(objectExpression), method, transformer.transform(arguments)); 092 answer.setSafe(safe); 093 return answer; 094 } 095 096 public Expression getArguments() { 097 return arguments; 098 } 099 100 public String getMethod() { 101 return method; 102 } 103 104 public Expression getObjectExpression() { 105 return objectExpression; 106 } 107 108 public String getText() { 109 return objectExpression.getText() + "." + method + arguments.getText(); 110 } 111 112 /** 113 * @return is this a safe method call, i.e. if true then if the source object is null 114 * then this method call will return null rather than throwing a null pointer exception 115 */ 116 public boolean isSafe() { 117 return safe; 118 } 119 120 public void setSafe(boolean safe) { 121 this.safe = safe; 122 } 123 124 public boolean isSpreadSafe() { 125 return spreadSafe; 126 } 127 128 public void setSpreadSafe(boolean value) { 129 spreadSafe = value; 130 } 131 132 /** 133 * @return true if no object expression was specified otherwise if 134 * some expression was specified for the object on which to evaluate 135 * the method then return false 136 */ 137 public boolean isImplicitThis() { 138 return implicitThis; 139 } 140 141 public void setImplicitThis(boolean implicitThis) { 142 this.implicitThis = implicitThis; 143 } 144 145 public String toString() { 146 return super.toString() 147 + "[object: " 148 + objectExpression 149 + " method: " 150 + method 151 + " arguments: " 152 + arguments 153 + "]"; 154 } 155 156 public static boolean isSuperMethodCall(MethodCallExpression call) { 157 Expression expression = call.getObjectExpression(); 158 if (expression instanceof VariableExpression) { 159 VariableExpression varExp = (VariableExpression) expression; 160 String variable = varExp.getName(); 161 return variable.equals("super"); 162 } 163 return false; 164 } 165 166 public void setMethod(MetaMethod mmeth) { 167 this.metaMethod = mmeth; 168 super.setType(ClassHelper.make(mmeth.getReturnType())); 169 } 170 }