01: /* PropertyUtils.java
02: *
03: * Created Aug 4, 2005
04: *
05: * Copyright (C) 2005 Internet Archive.
06: *
07: * This file is part of the Heritrix web crawler (crawler.archive.org).
08: *
09: * 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 23:35:10 +0000 (Mon, 15 Aug 2005) $ $Revision: 3760 $
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 getPropertyOrNull(final String key) {
35: String 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 key) {
44: return (getPropertyOrNull(key) == null) ? false : Boolean
45: .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 key,
55: final int fallback) {
56: return getPropertyOrNull(key) == null ? fallback : Integer
57: .parseInt(getPropertyOrNull(key));
58: }
59: }
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