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Java > Open Source Codes > org > netbeans > modules > java > source > engine > SourceReader


1 /*
2  * The contents of this file are subject to the terms of the Common Development
3  * and Distribution License (the License). You may not use this file except in
4  * compliance with the License.
5  *
6  * You can obtain a copy of the License at http://www.netbeans.org/cddl.html
7  * or http://www.netbeans.org/cddl.txt.
8  *
9  * When distributing Covered Code, include this CDDL Header Notice in each file
10  * and include the License file at http://www.netbeans.org/cddl.txt.
11  * If applicable, add the following below the CDDL Header, with the fields
12  * enclosed by brackets [] replaced by your own identifying information:
13  * "Portions Copyrighted [year] [name of copyright owner]"
14  *
15  * The Original Software is NetBeans. The Initial Developer of the Original
16  * Software is Sun Microsystems, Inc. Portions Copyright 1997-2006 Sun
17  * Microsystems, Inc. All Rights Reserved.
18  */
19
20 package org.netbeans.modules.java.source.engine;
21
22 import java.io.CharArrayReader JavaDoc;
23 import java.io.IOException JavaDoc;
24
25 /**
26  * Utility class for reading source files.
27  */
28 public class SourceReader extends CharArrayReader JavaDoc {
29
30     /**
31      * Create a new SourceReader instance.
32      *
33      * @param src the array of characters which are the source file's contents.
34      */
35     public SourceReader(char[] src) {
36         super(src);
37     }
38
39     /**
40      * Set position to specified array offset.
41      */
42     public long seek(int offset) throws IOException JavaDoc {
43         return skip(offset - pos);
44     }
45
46     /**
47      * Returns the chars between the current position and a
48      * specified offset.
49      *
50      * @param offset the ending offset of the text range to return.
51      * @throws IOException if the current position is greater
52      * than the offset, or if the offset is outside the
53      * range of the SourceReader's character array.
54      */
55     public char[] getCharsTo(int offset) throws IOException JavaDoc {
56         int len = offset - pos;
57         if (len < 0 || offset > super.count)
58             throw new IOException JavaDoc("invalid offset: " + offset);
59         char[] buf = new char[len];
60         read(buf);
61         return buf;
62     }
63     
64     /**
65      * Returns current reader position.
66      *
67      * @return reader position
68      */
69     public int getPos() {
70         return pos;
71     }
72 }
73
74
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