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


1 /* SubElement
2 *
3 * $Id: SubElement.java,v 1.8 2006/08/08 18:25:42 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  * Abstract ANVL 'data element' sub-part.
29  * Subclass to make a Comment, a Label, or a Value.
30  * @author stack
31  */
32 abstract class SubElement {
33     private final String JavaDoc e;
34
35     protected SubElement() {
36         this(null);
37     }
38
39     public SubElement(final String JavaDoc s) {
40         this.e = baseCheck(s);
41     }
42
43     protected String JavaDoc baseCheck(final String JavaDoc s) {
44         // Check for null.
45 if (s == null || s.length() <= 0) {
46             throw new IllegalArgumentException JavaDoc("Can't be null or empty");
47         }
48         // Check for CRLF.
49 for (int i = 0; i < s.length(); i++) {
50             checkCharacter(s.charAt(i), s, i);
51         }
52         return s;
53     }
54     
55     protected void checkCharacter(final char c, final String JavaDoc srcStr,
56             final int index) {
57         checkControlCharacter(c, srcStr, index);
58         checkCRLF(c, srcStr, index);
59     }
60     
61     protected void checkControlCharacter(final char c, final String JavaDoc srcStr,
62             final int index) {
63         if (Character.isISOControl(c) && !Character.isWhitespace(c) ||
64                 !Character.isValidCodePoint(c)) {
65             throw new IllegalArgumentException JavaDoc(srcStr +
66                 " contains a control character(s) or invalid code point: 0x" +
67                 Integer.toHexString(c));
68         }
69     }
70     
71     protected void checkCRLF(final char c, final String JavaDoc srcStr,
72             final int index) {
73         if (ANVLRecord.isCROrLF(c)) {
74             throw new IllegalArgumentException JavaDoc(srcStr +
75                 " contains disallowed CRLF control character(s): 0x" +
76                 Integer.toHexString(c));
77         }
78     }
79     
80     @Override JavaDoc
81     public String JavaDoc toString() {
82         return e;
83     }
84 }
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