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,
074: List values) {
075: this .verbatimText = verbatimText;
076: this .strings = strings;
077: this .values = values;
078: super .setType(ClassHelper.GSTRING_TYPE);
079: }
080:
081: public void visit(GroovyCodeVisitor visitor) {
082: visitor.visitGStringExpression(this );
083: }
084:
085: public Expression transformExpression(
086: ExpressionTransformer transformer) {
087: Expression ret = new GStringExpression(verbatimText,
088: transformExpressions(strings, transformer),
089: transformExpressions(values, transformer));
090: ret.setSourcePosition(this );
091: return ret;
092: }
093:
094: public String toString() {
095: return super .toString() + "[strings: " + strings + " values: "
096: + values + "]";
097: }
098:
099: public String getText() {
100: return verbatimText;
101: }
102:
103: public List getStrings() {
104: return strings;
105: }
106:
107: public List getValues() {
108: return values;
109: }
110:
111: public void addString(ConstantExpression text) {
112: if (text == null) {
113: throw new NullPointerException(
114: "Cannot add a null text expression");
115: }
116: strings.add(text);
117: }
118:
119: public void addValue(Expression value) {
120: // If the first thing is an value, then we need a dummy empty string in front of it so that when we
121: // toString it they come out in the correct order.
122: if (strings.size() == 0)
123: strings.add(ConstantExpression.EMPTY_STRING);
124: values.add(value);
125: }
126:
127: public Expression getValue(int idx) {
128: return (Expression) values.get(idx);
129: }
130:
131: public boolean isConstantString() {
132: return values.isEmpty();
133: }
134:
135: public Expression asConstantString() {
136: StringBuffer buffer = new StringBuffer();
137: for (Iterator iter = strings.iterator(); iter.hasNext();) {
138: ConstantExpression expression = (ConstantExpression) iter
139: .next();
140: Object value = expression.getValue();
141: if (value != null) {
142: buffer.append(value);
143: }
144: }
145: return new ConstantExpression(buffer.toString());
146: }
147: }
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