View Javadoc

1   /*
2    $Id: ListExpression.java,v 1.3 2004/07/10 03:31:37 bran 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.AsmClassGenerator2;
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: 1.3 $
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(AsmClassGenerator2 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 }