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Java > Open Source Codes > org > archive > util > PropertyUtils


1 /* PropertyUtils.java
2  *
3  * Created Aug 4, 2005
4  *
5  * Copyright (C) 2005 Internet Archive.
6  *
7  * This file is part of the Heritrix web crawler (crawler.archive.org).
8  *
9  * Heritrix is free software; you can redistribute it and/or modify
10  * it under the terms of the GNU Lesser Public License as published by
11  * the Free Software Foundation; either version 2.1 of the License, or
12  * any later version.
13  *
14  * Heritrix is distributed in the hope that it will be useful,
15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17  * GNU Lesser Public License for more details.
18  *
19  * You should have received a copy of the GNU Lesser Public License
20  * along with Heritrix; if not, write to the Free Software
21  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
22  */
23 package org.archive.util;
24
25 /**
26  * @author stack
27  * @version $Date: 2005/08/15 23:34:58 $ $Revision: 1.1 $
28  */
29 public class PropertyUtils {
30     /***
31      * @param key Property key.
32      * @return Named property or null if the property is null or empty.
33      */
34     public static String JavaDoc getPropertyOrNull(final String JavaDoc key) {
35         String JavaDoc value = System.getProperty(key);
36         return (value == null || value.length() <= 0)? null: value;
37     }
38
39     /***
40      * @param key Property key.
41      * @return Boolean value or false if null or unreadable.
42      */
43     public static boolean getBooleanProperty(final String JavaDoc key) {
44         return (getPropertyOrNull(key) == null)?
45                 false: Boolean.valueOf(getPropertyOrNull(key)).booleanValue();
46     }
47     
48     /**
49      * @param key Key to use looking up system property.
50      * @param fallback If no value found for passed <code>key</code>, return
51      * <code>fallback</code>.
52      * @return Value of property or <code>fallback</code>.
53      */
54     public static int getIntProperty(final String JavaDoc key, final int fallback) {
55         return getPropertyOrNull(key) == null?
56                 fallback: Integer.parseInt(getPropertyOrNull(key));
57     }
58 }
59
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