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Java > Open Source Codes > org > archive > util > anvl > Value


1 /* Value
2 *
3 * $Id: Value.java,v 1.9.2.1 2007/01/13 01:31:40 stack-sf Exp $
4 *
5 * Created on July 26, 2006.
6 *
7 * Copyright (C) 2006 Internet Archive.
8 *
9 * This file is part of the Heritrix web crawler (crawler.archive.org).
10 *
11 * Heritrix is free software; you can redistribute it and/or modify
12 * it under the terms of the GNU Lesser Public License as published by
13 * the Free Software Foundation; either version 2.1 of the License, or
14 * any later version.
15 *
16 * Heritrix is distributed in the hope that it will be useful,
17 * but WITHOUT ANY WARRANTY; without even the implied warranty of
18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
19 * GNU Lesser Public License for more details.
20 *
21 * You should have received a copy of the GNU Lesser Public License
22 * along with Heritrix; if not, write to the Free Software
23 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
24 */
25 package org.archive.util.anvl;
26
27 /**
28  * TODO: Now values 'fold' but should but perhaps they shouldn't be stored
29  * folded. Only when we serialize should we fold (But how to know where
30  * to fold?).
31  * @author stack
32  * @version $Date: 2007/01/13 01:31:40 $ $Version$
33  */
34 class Value extends SubElement {
35
36     private StringBuilder JavaDoc sb;
37     private boolean folding = false;
38     
39     private Value() {
40         this(null);
41     }
42     
43     public Value(final String JavaDoc s) {
44         super(s);
45     }
46     
47     protected String JavaDoc baseCheck(String JavaDoc s) {
48         this.sb = new StringBuilder JavaDoc(s.length() * 2);
49         super.baseCheck(s);
50         return sb.toString();
51     }
52     
53     @Override JavaDoc
54     protected void checkCharacter(char c, String JavaDoc srcStr, int index) {
55         checkControlCharacter(c, srcStr, index);
56         // Now, rewrite the value String with folding (If CR or LF or CRLF
57 // present.
58 if (ANVLRecord.isCR(c)) {
59             this.folding = true;
60             this.sb.append(ANVLRecord.FOLD_PREFIX);
61         } else if (ANVLRecord.isLF(c)) {
62             if (!this.folding) {
63                 this.folding = true;
64                 this.sb.append(ANVLRecord.FOLD_PREFIX);
65             } else {
66                 // Previous character was a CR. Fold prefix has been added.
67 }
68         } else if (this.folding && Character.isWhitespace(c)) {
69             // Only write out one whitespace character. Skip.
70 } else {
71             this.folding = false;
72             this.sb.append(c);
73         }
74     }
75 }
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