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org.apache.commons.configuration.web.BaseWebConfiguration |
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1 | /* |
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2 | * Copyright 2004-2005 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 | package org.apache.commons.configuration.web; |
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17 | ||
18 | import org.apache.commons.configuration.AbstractConfiguration; |
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19 | ||
20 | /** |
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21 | * <p> |
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22 | * An abstract base class for all web configurations. |
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23 | * </p> |
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24 | * <p> |
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25 | * This class implements common functionality used by all web based |
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26 | * configurations. E.g. some methods are not supported by configurations of this |
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27 | * type, so they throw a <code>UnsupportedOperationException</code> exception. |
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28 | * </p> |
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29 | * |
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30 | * @author Oliver Heger |
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31 | * @version $Id: BaseWebConfiguration.java 314999 2005-10-12 19:01:43Z oheger $ |
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32 | * @since 1.2 |
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33 | */ |
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34 | 120 | abstract class BaseWebConfiguration extends AbstractConfiguration |
35 | { |
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36 | /** |
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37 | * Checks if this configuration is empty. This implementation makes use of |
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38 | * the <code>getKeys()</code> method (which must be defined by concrete |
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39 | * sub classes) to find out whether properties exist. |
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40 | * |
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41 | * @return a flag whether this configuration is empty |
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42 | */ |
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43 | public boolean isEmpty() |
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44 | { |
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45 | 30 | return !getKeys().hasNext(); |
46 | } |
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47 | ||
48 | /** |
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49 | * Checks whether the specified key is stored in this configuration. |
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50 | * |
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51 | * @param key the key |
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52 | * @return a flag whether this key exists in this configuration |
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53 | */ |
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54 | public boolean containsKey(String key) |
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55 | { |
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56 | 30 | return getProperty(key) != null; |
57 | } |
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58 | ||
59 | /** |
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60 | * Removes the property with the given key. <strong>This operation is not |
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61 | * supported and will throw an UnsupportedOperationException.</strong> |
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62 | * |
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63 | * @param key the key of the property to be removed |
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64 | * @throws UnsupportedOperationException because this operation is not |
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65 | * allowed |
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66 | */ |
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67 | public void clearProperty(String key) |
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68 | { |
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69 | 15 | throw new UnsupportedOperationException("Read only configuration"); |
70 | } |
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71 | ||
72 | /** |
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73 | * Adds a property to this configuration. <strong>This operation is not |
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74 | * supported and will throw an UnsupportedOperationException.</strong> |
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75 | * |
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76 | * @param key the key of the property |
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77 | * @param obj the value to be added |
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78 | * @throws UnsupportedOperationException because this operation is not |
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79 | * allowed |
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80 | */ |
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81 | protected void addPropertyDirect(String key, Object obj) |
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82 | { |
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83 | 15 | throw new UnsupportedOperationException("Read only configuration"); |
84 | } |
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85 | } |
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