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18 package org.apache.commons.configuration.web;
19
20 import java.util.ArrayList;
21 import java.util.Collection;
22 import java.util.Iterator;
23 import java.util.List;
24
25 import javax.servlet.ServletRequest;
26
27 import org.apache.commons.collections.iterators.EnumerationIterator;
28
29 /***
30 * A configuration wrapper to read the parameters of a servlet request. This
31 * configuration is read only, adding or removing a property will throw an
32 * UnsupportedOperationException.
33 *
34 * @author <a href="mailto:ebourg@apache.org">Emmanuel Bourg</a>
35 * @version $Revision: 515306 $, $Date: 2007-03-06 22:15:00 +0100 (Di, 06 Mrz 2007) $
36 * @since 1.1
37 */
38 public class ServletRequestConfiguration extends BaseWebConfiguration
39 {
40 /*** Stores the wrapped request.*/
41 protected ServletRequest request;
42
43 /***
44 * Create a ServletRequestConfiguration using the request parameters.
45 *
46 * @param request the servlet request
47 */
48 public ServletRequestConfiguration(ServletRequest request)
49 {
50 this.request = request;
51 }
52
53 public Object getProperty(String key)
54 {
55 String[] values = request.getParameterValues(key);
56
57 if (values == null || values.length == 0)
58 {
59 return null;
60 }
61 else if (values.length == 1)
62 {
63 return handleDelimiters(values[0]);
64 }
65 else
66 {
67
68 List result = new ArrayList(values.length);
69 for (int i = 0; i < values.length; i++)
70 {
71 Object val = handleDelimiters(values[i]);
72 if (val instanceof Collection)
73 {
74 result.addAll((Collection) val);
75 }
76 else
77 {
78 result.add(val);
79 }
80 }
81 return result;
82 }
83 }
84
85 public Iterator getKeys()
86 {
87 return new EnumerationIterator(request.getParameterNames());
88 }
89 }