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Java > Open Source Codes > org > eclipse > jdt > internal > compiler > ast > StringLiteralConcatenation


1 /*******************************************************************************
2  * Copyright (c) 2000, 2006 IBM Corporation and others.
3  * All rights reserved. This program and the accompanying materials
4  * are made available under the terms of the Eclipse Public License v1.0
5  * which accompanies this distribution, and is available at
6  * http://www.eclipse.org/legal/epl-v10.html
7  *
8  * Contributors:
9  * IBM Corporation - initial API and implementation
10  *******************************************************************************/
11 package org.eclipse.jdt.internal.compiler.ast;
12
13 import org.eclipse.jdt.internal.compiler.ASTVisitor;
14 import org.eclipse.jdt.internal.compiler.lookup.BlockScope;
15
16 /**
17  * Flatten string literal
18  */
19 public class StringLiteralConcatenation extends StringLiteral {
20     private static final int INITIAL_SIZE = 5;
21     public Expression[] literals;
22     public int counter;
23     /**
24      * Build a two-strings literal
25      * */
26     public StringLiteralConcatenation(StringLiteral str1, StringLiteral str2) {
27         super(str1.sourceStart, str1.sourceEnd);
28         this.source = str1.source;
29         this.literals = new StringLiteral[INITIAL_SIZE];
30         this.counter = 0;
31         this.literals[this.counter++] = str1;
32         extendsWith(str2);
33     }
34
35     /**
36      * Add the lit source to mine, just as if it was mine
37      */
38     public StringLiteralConcatenation extendsWith(StringLiteral lit) {
39         this.sourceEnd = lit.sourceEnd;
40         final int literalsLength = this.literals.length;
41         if (this.counter == literalsLength) {
42             // resize
43 System.arraycopy(this.literals, 0, this.literals = new StringLiteral[literalsLength + INITIAL_SIZE], 0, literalsLength);
44         }
45         //uddate the source
46 int length = source.length;
47         System.arraycopy(
48             source,
49             0,
50             source = new char[length + lit.source.length],
51             0,
52             length);
53         System.arraycopy(lit.source, 0, source, length, lit.source.length);
54         this.literals[this.counter++] = lit;
55         return this;
56     }
57     
58     public StringBuffer JavaDoc printExpression(int indent, StringBuffer JavaDoc output) {
59         output.append("StringLiteralConcatenation{"); //$NON-NLS-1$
60 for (int i = 0, max = this.counter; i < max; i++) {
61             this.literals[i].printExpression(indent, output);
62             output.append("+\n");//$NON-NLS-1$
63 }
64         return output.append('}');
65     }
66     
67     public char[] source() {
68         return source;
69     }
70
71     public void traverse(ASTVisitor visitor, BlockScope scope) {
72         if (visitor.visit(this, scope)) {
73             for (int i = 0, max = this.counter; i < max; i++) {
74                 this.literals[i].traverse(visitor, scope);
75             }
76         }
77         visitor.endVisit(this, scope);
78     }
79 }
80
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