001 /* 002 $Id: GStringExpression.java 3419 2006-01-19 00:07:02Z blackdrag $ 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 java.util.ArrayList; 049 import java.util.Iterator; 050 import java.util.List; 051 052 import org.codehaus.groovy.ast.ClassHelper; 053 import org.codehaus.groovy.ast.GroovyCodeVisitor; 054 055 /** 056 * Represents a String expression which contains embedded values inside 057 * it such as "hello there ${user} how are you" which is expanded lazily 058 * 059 * @author <a href="mailto:james@coredevelopers.net">James Strachan</a> 060 * @version $Revision: 3419 $ 061 */ 062 public class GStringExpression extends Expression { 063 064 private String verbatimText; 065 private List strings = new ArrayList(); 066 private List values = new ArrayList(); 067 068 public GStringExpression(String verbatimText) { 069 this.verbatimText = verbatimText; 070 super.setType(ClassHelper.GSTRING_TYPE); 071 } 072 073 public GStringExpression(String verbatimText, List strings, List values) { 074 this.verbatimText = verbatimText; 075 this.strings = strings; 076 this.values = values; 077 super.setType(ClassHelper.GSTRING_TYPE); 078 } 079 080 public void visit(GroovyCodeVisitor visitor) { 081 visitor.visitGStringExpression(this); 082 } 083 084 public Expression transformExpression(ExpressionTransformer transformer) { 085 Expression ret = new GStringExpression( 086 verbatimText, 087 transformExpressions(strings, transformer), 088 transformExpressions(values, transformer)); 089 ret.setSourcePosition(this); 090 return ret; 091 } 092 093 public String toString() { 094 return super.toString() + "[strings: " + strings + " values: " + values + "]"; 095 } 096 097 public String getText() { 098 return verbatimText; 099 } 100 101 public List getStrings() { 102 return strings; 103 } 104 105 public List getValues() { 106 return values; 107 } 108 109 public void addString(ConstantExpression text) { 110 if (text == null) { 111 throw new NullPointerException("Cannot add a null text expression"); 112 } 113 strings.add(text); 114 } 115 116 public void addValue(Expression value) { 117 // If the first thing is an value, then we need a dummy empty string in front of it so that when we 118 // toString it they come out in the correct order. 119 if (strings.size() == 0) 120 strings.add(ConstantExpression.EMPTY_STRING); 121 values.add(value); 122 } 123 124 public Expression getValue(int idx) { 125 return (Expression) values.get(idx); 126 } 127 128 public boolean isConstantString() { 129 return values.isEmpty(); 130 } 131 132 public Expression asConstantString() { 133 StringBuffer buffer = new StringBuffer(); 134 for (Iterator iter = strings.iterator(); iter.hasNext();) { 135 ConstantExpression expression = (ConstantExpression) iter.next(); 136 Object value = expression.getValue(); 137 if (value != null) { 138 buffer.append(value); 139 } 140 } 141 return new ConstantExpression(buffer.toString()); 142 } 143 }