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org.apache.commons.configuration.web.ServletRequestConfiguration |
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1 | /* |
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2 | * Copyright 2004 The Apache Software Foundation. |
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3 | * |
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4 | * Licensed under the Apache License, Version 2.0 (the "License") |
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5 | * you may not use this file except in compliance with the License. |
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6 | * You may obtain a copy of the License at |
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7 | * |
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8 | * http://www.apache.org/licenses/LICENSE-2.0 |
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9 | * |
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10 | * Unless required by applicable law or agreed to in writing, software |
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11 | * distributed under the License is distributed on an "AS IS" BASIS, |
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12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
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13 | * See the License for the specific language governing permissions and |
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14 | * limitations under the License. |
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15 | */ |
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16 | ||
17 | package org.apache.commons.configuration.web; |
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18 | ||
19 | import java.util.Iterator; |
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20 | import java.util.Arrays; |
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21 | import javax.servlet.ServletRequest; |
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22 | ||
23 | import org.apache.commons.collections.iterators.EnumerationIterator; |
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24 | import org.apache.commons.configuration.AbstractConfiguration; |
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25 | ||
26 | /** |
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27 | * A configuration wrapper to read the parameters of a servlet request. This |
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28 | * configuration is read only, adding or removing a property will throw an |
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29 | * UnsupportedOperationException. |
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30 | * |
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31 | * @author <a href="mailto:ebourg@apache.org">Emmanuel Bourg</a> |
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32 | * @version $Revision: 155408 $, $Date: 2005-02-26 13:56:39 +0100 (Sa, 26 Feb 2005) $ |
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33 | * @since 1.1 |
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34 | */ |
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35 | public class ServletRequestConfiguration extends AbstractConfiguration |
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36 | { |
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37 | protected ServletRequest request; |
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38 | ||
39 | /** |
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40 | * Create a ServletRequestConfiguration using the request parameters. |
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41 | * |
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42 | * @param request the servlet request |
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43 | */ |
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44 | 72 | public ServletRequestConfiguration(ServletRequest request) |
45 | 184 | { |
46 | 184 | this.request = request; |
47 | 112 | } |
48 | ||
49 | public Object getProperty(String key) |
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50 | 45 | { |
51 | 98 | String values[] = request.getParameterValues(key); |
52 | ||
53 | 98 | if (values == null || values.length == 0) |
54 | { |
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55 | 28 | return null; |
56 | } |
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57 | 70 | else if (values.length == 1) |
58 | { |
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59 | 42 | return values[0]; |
60 | } |
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61 | 9 | else |
62 | { |
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63 | 28 | return Arrays.asList(values); |
64 | } |
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65 | } |
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66 | 18 | |
67 | /** |
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68 | * <p><strong>This operation is not supported and will throw an |
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69 | * UnsupportedOperationException.</strong></p> |
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70 | * |
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71 | 18 | * @throws UnsupportedOperationException |
72 | */ |
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73 | protected void addPropertyDirect(String key, Object obj) |
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74 | { |
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75 | 14 | throw new UnsupportedOperationException("Read only configuration"); |
76 | } |
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77 | ||
78 | public boolean isEmpty() |
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79 | { |
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80 | 28 | return !getKeys().hasNext(); |
81 | } |
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82 | 9 | |
83 | public boolean containsKey(String key) |
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84 | { |
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85 | 28 | return getProperty(key) != null; |
86 | } |
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87 | 36 | |
88 | /** |
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89 | * <p><strong>This operation is not supported and will throw an |
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90 | * UnsupportedOperationException.</strong></p> |
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91 | * |
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92 | * @throws UnsupportedOperationException |
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93 | */ |
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94 | public void clearProperty(String key) |
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95 | { |
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96 | 14 | throw new UnsupportedOperationException("Read only configuration"); |
97 | } |
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98 | ||
99 | public Iterator getKeys() |
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100 | { |
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101 | 42 | return new EnumerationIterator(request.getParameterNames()); |
102 | } |
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103 | } |
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