1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17 package org.apache.commons.configuration.web;
18
19 import java.util.Iterator;
20 import java.util.List;
21 import javax.servlet.Servlet;
22 import javax.servlet.ServletConfig;
23
24 import org.apache.commons.collections.iterators.EnumerationIterator;
25 import org.apache.commons.configuration.AbstractConfiguration;
26 import org.apache.commons.configuration.PropertyConverter;
27
28 /***
29 * A configuration wrapper around a {@link ServletConfig}. This configuration
30 * is read only, adding or removing a property will throw an
31 * UnsupportedOperationException.
32 *
33 * @author <a href="mailto:ebourg@apache.org">Emmanuel Bourg</a>
34 * @version $Revision: 155408 $, $Date: 2005-02-26 13:56:39 +0100 (Sa, 26 Feb 2005) $
35 * @since 1.1
36 */
37 public class ServletConfiguration extends AbstractConfiguration
38 {
39 protected ServletConfig config;
40
41 /***
42 * Create a ServletConfiguration using the initialization parameter of
43 * the specified servlet.
44 *
45 * @param servlet the servlet
46 */
47 public ServletConfiguration(Servlet servlet)
48 {
49 this(servlet.getServletConfig());
50 }
51
52 /***
53 * Create a ServletConfiguration using the servlet initialization parameters.
54 *
55 * @param config the servlet configuration
56 */
57 public ServletConfiguration(ServletConfig config)
58 {
59 this.config = config;
60 }
61
62 public Object getProperty(String key)
63 {
64 Object value = config.getInitParameter(key);
65 List list = PropertyConverter.split((String) value, getDelimiter());
66
67 return list.size() > 1 ? list : value;
68 }
69
70 /***
71 * <p><strong>This operation is not supported and will throw an
72 * UnsupportedOperationException.</strong></p>
73 *
74 * @throws UnsupportedOperationException
75 */
76 protected void addPropertyDirect(String key, Object obj)
77 {
78 throw new UnsupportedOperationException("Read only configuration");
79 }
80
81 public boolean isEmpty()
82 {
83 return !getKeys().hasNext();
84 }
85
86 public boolean containsKey(String key)
87 {
88 return getProperty(key) != null;
89 }
90
91 /***
92 * <p><strong>This operation is not supported and will throw an
93 * UnsupportedOperationException.</strong></p>
94 *
95 * @throws UnsupportedOperationException
96 */
97 public void clearProperty(String key)
98 {
99 throw new UnsupportedOperationException("Read only configuration");
100 }
101
102 public Iterator getKeys()
103 {
104 return new EnumerationIterator(config.getInitParameterNames());
105 }
106
107 }