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org.apache.torque.engine.database.model.NameFactory |
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1 | package org.apache.torque.engine.database.model; |
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2 | ||
3 | /* |
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4 | * Copyright 2001-2005 The Apache Software Foundation. |
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5 | * |
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6 | * Licensed under the Apache License, Version 2.0 (the "License") |
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7 | * you may not use this file except in compliance with the License. |
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8 | * You may obtain a copy of the License at |
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9 | * |
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10 | * http://www.apache.org/licenses/LICENSE-2.0 |
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11 | * |
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12 | * Unless required by applicable law or agreed to in writing, software |
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13 | * distributed under the License is distributed on an "AS IS" BASIS, |
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14 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
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15 | * See the License for the specific language governing permissions and |
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16 | * limitations under the License. |
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17 | */ |
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18 | ||
19 | import java.util.Hashtable; |
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20 | import java.util.List; |
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21 | ||
22 | import org.apache.torque.engine.EngineException; |
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23 | ||
24 | /** |
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25 | * A name generation factory. |
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26 | * |
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27 | * @author <a href="mailto:dlr@finemaltcoding.com>Daniel Rall</a> |
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28 | * @version $Id: NameFactory.java 239626 2005-08-24 12:19:51Z henning $ |
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29 | */ |
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30 | public class NameFactory |
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31 | { |
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32 | /** |
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33 | * The fully qualified class name of the Java name generator. |
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34 | */ |
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35 | 9 | public static final String JAVA_GENERATOR = |
36 | 18 | JavaNameGenerator.class.getName(); |
37 | ||
38 | /** |
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39 | * The fully qualified class name of the constraint name generator. |
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40 | */ |
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41 | 9 | public static final String CONSTRAINT_GENERATOR = |
42 | ConstraintNameGenerator.class.getName(); |
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43 | ||
44 | /** |
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45 | * The single instance of this class. |
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46 | */ |
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47 | 9 | private static NameFactory instance = new NameFactory(); |
48 | ||
49 | /** |
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50 | * The cache of <code>NameGenerator</code> algorithms in use for |
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51 | * name generation, keyed by fully qualified class name. |
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52 | */ |
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53 | private Hashtable algorithms; |
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54 | ||
55 | /** |
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56 | * Creates a new instance with storage for algorithm implementations. |
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57 | */ |
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58 | protected NameFactory() |
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59 | 9 | { |
60 | 9 | algorithms = new Hashtable(5); |
61 | 9 | } |
62 | ||
63 | /** |
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64 | * Factory method which retrieves an instance of the named generator. |
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65 | * |
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66 | * @param name The fully qualified class name of the name |
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67 | * generation algorithm to retrieve. |
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68 | * @return A name generator |
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69 | */ |
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70 | protected NameGenerator getAlgorithm(String name) |
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71 | throws EngineException |
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72 | { |
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73 | 2057 | synchronized (algorithms) |
74 | { |
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75 | 2057 | NameGenerator algorithm = (NameGenerator) algorithms.get(name); |
76 | 2057 | if (algorithm == null) |
77 | { |
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78 | try |
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79 | { |
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80 | 12 | algorithm = |
81 | (NameGenerator) Class.forName(name).newInstance(); |
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82 | } |
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83 | 0 | catch (InstantiationException e) |
84 | { |
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85 | 0 | throw new EngineException("Unable to instantiate class " |
86 | + name + ": Make sure it's in your run-time classpath", e); |
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87 | } |
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88 | 1 | catch (Exception e) |
89 | { |
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90 | 1 | throw new EngineException(e); |
91 | 11 | } |
92 | 11 | algorithms.put(name, algorithm); |
93 | } |
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94 | 2056 | return algorithm; |
95 | 1 | } |
96 | } |
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97 | ||
98 | /** |
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99 | * Given a list of <code>String</code> objects, implements an |
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100 | * algorithm which produces a name. |
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101 | * |
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102 | * @param algorithmName The fully qualified class name of the |
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103 | * {@link org.apache.torque.engine.database.model.NameGenerator} |
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104 | * implementation to use to generate names. |
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105 | * @param inputs Inputs used to generate a name. |
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106 | * @return The generated name. |
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107 | * @throws EngineException an exception |
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108 | */ |
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109 | public static String generateName(String algorithmName, List inputs) |
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110 | throws EngineException |
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111 | { |
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112 | 2057 | NameGenerator algorithm = instance.getAlgorithm(algorithmName); |
113 | 2056 | return algorithm.generateName(inputs); |
114 | } |
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115 | } |
This report is generated by jcoverage, Maven and Maven JCoverage Plugin. |