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org.apache.commons.configuration.web.AppletConfiguration |
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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.applet.Applet; |
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20 | import java.util.Iterator; |
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21 | import java.util.List; |
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22 | ||
23 | import org.apache.commons.collections.iterators.ArrayIterator; |
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24 | import org.apache.commons.configuration.AbstractConfiguration; |
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25 | import org.apache.commons.configuration.PropertyConverter; |
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26 | ||
27 | /** |
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28 | * A configuration wrapper to read applet parameters. This configuration is |
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29 | * read only, adding or removing a property will throw an |
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30 | * UnsupportedOperationException. |
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31 | * |
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32 | * @author <a href="mailto:ebourg@apache.org">Emmanuel Bourg</a> |
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33 | * @version $Revision: 155408 $, $Date: 2005-02-26 13:56:39 +0100 (Sa, 26 Feb 2005) $ |
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34 | * @since 1.1 |
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35 | */ |
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36 | public class AppletConfiguration extends AbstractConfiguration |
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37 | { |
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38 | protected Applet applet; |
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39 | ||
40 | /** |
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41 | * Create an AppletConfiguration using the initialization parameters of |
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42 | * the specified Applet. |
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43 | * |
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44 | * @param applet |
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45 | 72 | */ |
46 | 72 | public AppletConfiguration(Applet applet) |
47 | 184 | { |
48 | 112 | this.applet = applet; |
49 | 112 | } |
50 | ||
51 | 45 | public Object getProperty(String key) |
52 | { |
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53 | 98 | Object value = applet.getParameter(key); |
54 | 98 | List list = PropertyConverter.split((String) value, getDelimiter()); |
55 | ||
56 | 98 | return list.size() > 1 ? list : value; |
57 | } |
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58 | ||
59 | /** |
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60 | * <p><strong>This operation is not supported and will throw an |
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61 | * UnsupportedOperationException.</strong></p> |
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62 | 9 | * |
63 | * @throws UnsupportedOperationException |
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64 | */ |
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65 | protected void addPropertyDirect(String key, Object obj) |
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66 | { |
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67 | 32 | throw new UnsupportedOperationException("Read only configuration"); |
68 | } |
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69 | ||
70 | public boolean isEmpty() |
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71 | { |
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72 | 46 | return !getKeys().hasNext(); |
73 | } |
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74 | ||
75 | public boolean containsKey(String key) |
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76 | { |
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77 | 28 | return getProperty(key) != null; |
78 | } |
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79 | ||
80 | /** |
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81 | * <p><strong>This operation is not supported and will throw an |
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82 | * UnsupportedOperationException.</strong></p> |
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83 | 9 | * |
84 | * @throws UnsupportedOperationException |
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85 | */ |
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86 | public void clearProperty(String key) |
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87 | { |
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88 | 50 | throw new UnsupportedOperationException("Read only configuration"); |
89 | 36 | } |
90 | 72 | |
91 | public Iterator getKeys() |
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92 | 36 | { |
93 | 42 | String[][] paramsInfo = applet.getParameterInfo(); |
94 | 42 | String[] keys = new String[paramsInfo != null ? paramsInfo.length : 0]; |
95 | 162 | for (int i = 0; i < keys.length; i++) |
96 | { |
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97 | 84 | keys[i] = paramsInfo[i][0]; |
98 | } |
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99 | ||
100 | 42 | return new ArrayIterator(keys); |
101 | } |
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102 | } |
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