1 /*
2 $Id: ListExpression.java,v 1.4 2005/02/01 10:46:54 russel Exp $
3
4 Copyright 2003 (C) James Strachan and Bob Mcwhirter. All Rights Reserved.
5
6 Redistribution and use of this software and associated documentation
7 ("Software"), with or without modification, are permitted provided
8 that the following conditions are met:
9
10 1. Redistributions of source code must retain copyright
11 statements and notices. Redistributions must also contain a
12 copy of this document.
13
14 2. Redistributions in binary form must reproduce the
15 above copyright notice, this list of conditions and the
16 following disclaimer in the documentation and/or other
17 materials provided with the distribution.
18
19 3. The name "groovy" must not be used to endorse or promote
20 products derived from this Software without prior written
21 permission of The Codehaus. For written permission,
22 please contact info@codehaus.org.
23
24 4. Products derived from this Software may not be called "groovy"
25 nor may "groovy" appear in their names without prior written
26 permission of The Codehaus. "groovy" is a registered
27 trademark of The Codehaus.
28
29 5. Due credit should be given to The Codehaus -
30 http://groovy.codehaus.org/
31
32 THIS SOFTWARE IS PROVIDED BY THE CODEHAUS AND CONTRIBUTORS
33 ``AS IS'' AND ANY EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT
34 NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
35 FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
36 THE CODEHAUS OR ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
37 INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
38 (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
39 SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
40 HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
41 STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
42 ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
43 OF THE POSSIBILITY OF SUCH DAMAGE.
44
45 */
46 package org.codehaus.groovy.ast.expr;
47
48 import java.util.ArrayList;
49 import java.util.Iterator;
50 import java.util.List;
51
52 import org.codehaus.groovy.ast.GroovyCodeVisitor;
53 import org.codehaus.groovy.classgen.AsmClassGenerator;
54
55 /***
56 * Represents a list expression [1, 2, 3] which creates a mutable List
57 *
58 * @author <a href="mailto:james@coredevelopers.net">James Strachan</a>
59 * @version $Revision: 1.4 $
60 */
61 public class ListExpression extends Expression {
62 private List expressions;
63
64 public ListExpression() {
65 this(new ArrayList());
66 }
67
68 public ListExpression(List expressions) {
69 this.expressions = expressions;
70 //
71 }
72
73 public void addExpression(Expression expression) {
74 expressions.add(expression);
75 }
76
77 public List getExpressions() {
78 return expressions;
79 }
80
81 public void visit(GroovyCodeVisitor visitor) {
82 visitor.visitListExpression(this);
83 }
84
85 public Expression transformExpression(ExpressionTransformer transformer) {
86 return new ListExpression(transformExpressions(getExpressions(), transformer));
87 }
88
89 protected void resolveType(AsmClassGenerator resolver) {
90 for (int i = 0; i < expressions.size(); i++) {
91 Expression expression = (Expression) expressions.get(i);
92 expression.resolve(resolver);
93 }
94 super.setTypeClass(List.class);
95 }
96
97 public Expression getExpression(int i) {
98 return (Expression) expressions.get(i);
99 }
100
101 public String getText() {
102 StringBuffer buffer = new StringBuffer("[");
103 boolean first = true;
104 for (Iterator iter = expressions.iterator(); iter.hasNext(); ) {
105 if (first) {
106 first = false;
107 }
108 else {
109 buffer.append(", ");
110 }
111
112 buffer.append(((Expression)iter.next()).getText());
113 }
114 buffer.append("]");
115 return buffer.toString();
116 }
117
118 public String toString() {
119 return super.toString() + expressions;
120 }
121
122 /***
123 * return the common element type of all the element
124 * @return
125 */
126 public Class getComponentTypeClass() {
127 boolean first = true;
128 Class cls = null;
129
130 for (Iterator iter = expressions.iterator(); iter.hasNext(); ) {
131 Expression exp = (Expression) iter.next();
132 if (cls == null) {
133 cls = exp.getTypeClass();
134 }
135 else {
136 if (cls != exp.getTypeClass()) {
137 // a heterogenous list
138 return null;
139 }
140 }
141 }
142 return cls;
143 }
144
145
146 }