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Java > Open Source Codes > org > netbeans > modules > subversion > ui > blame > LinesReader


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.subversion.ui.blame;
21
22 import java.io.Reader JavaDoc;
23 import java.io.IOException JavaDoc;
24 import java.util.List JavaDoc;
25
26 /**
27  * Reader over annotation lines. It uses '\n' as
28  * line separator to match Document line separator.
29  *
30  * @author Petr Kuzel
31  */
32 public final class LinesReader extends Reader JavaDoc {
33
34     private List JavaDoc lines;
35     private int lineIndex;
36     private int columnIndex;
37     private boolean closed;
38
39     /**
40      * Creates reader from list of AnnotateLine objects.
41      */
42     LinesReader(List JavaDoc lines) {
43         this.lines = lines;
44     }
45
46     public void close() throws IOException JavaDoc {
47         if (closed) throw new IOException JavaDoc("Closed"); // NOI18N
48 closed = true;
49     }
50
51     public int read(char cbuf[], int off, int len) throws IOException JavaDoc {
52         if (closed) throw new IOException JavaDoc("Closed"); // NOI18N
53
54         if (lineIndex >= lines.size()) return -1;
55
56         AnnotateLine aline = (AnnotateLine) lines.get(lineIndex);
57         String JavaDoc line = aline.getContent() + "\n"; // NOI18N
58 int lineLen = line.length();
59         int unread = lineLen - columnIndex;
60         int toRead = Math.min(unread, len);
61         line.getChars(columnIndex, columnIndex + toRead, cbuf, off);
62         columnIndex += toRead;
63         if (columnIndex >= lineLen) {
64             columnIndex = 0;
65             lineIndex++;
66         }
67         return toRead;
68     }
69 }
70
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