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Java > Open Source Codes > org > netbeans > modules > versioning > system > cvss > ui > actions > annotate > 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.versioning.system.cvss.ui.actions.annotate;
21
22 import org.netbeans.lib.cvsclient.command.annotate.AnnotateLine;
23
24 import java.io.Reader JavaDoc;
25 import java.io.IOException JavaDoc;
26 import java.util.List JavaDoc;
27
28 /**
29  * Reader over annotation lines. It uses '\n' as
30  * line separator to match Document line separator.
31  *
32  * @author Petr Kuzel
33  */
34 public final class LinesReader extends Reader JavaDoc {
35
36     private List JavaDoc lines;
37     private int lineIndex;
38     private int columnIndex;
39     private boolean closed;
40
41     /**
42      * Creates reader from list of AnnotateLine objects.
43      */
44     LinesReader(List JavaDoc lines) {
45         this.lines = lines;
46     }
47
48     public void close() throws IOException JavaDoc {
49         if (closed) throw new IOException JavaDoc("Closed"); // NOI18N
50 closed = true;
51     }
52
53     public int read(char cbuf[], int off, int len) throws IOException JavaDoc {
54         if (closed) throw new IOException JavaDoc("Closed"); // NOI18N
55
56         if (lineIndex >= lines.size()) return -1;
57
58         AnnotateLine aline = (AnnotateLine) lines.get(lineIndex);
59         String JavaDoc line = aline.getContent() + "\n"; // NOI18N
60 int lineLen = line.length();
61         int unread = lineLen - columnIndex;
62         int toRead = Math.min(unread, len);
63         line.getChars(columnIndex, columnIndex + toRead, cbuf, off);
64         columnIndex += toRead;
65         if (columnIndex >= lineLen) {
66             columnIndex = 0;
67             lineIndex++;
68         }
69         return toRead;
70     }
71 }
72
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