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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 | * Licensed to the Apache Software Foundation (ASF) under one |
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5 | * or more contributor license agreements. See the NOTICE file |
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6 | * distributed with this work for additional information |
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7 | * regarding copyright ownership. The ASF licenses this file |
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8 | * to you under the Apache License, Version 2.0 (the |
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9 | * "License"); you may not use this file except in compliance |
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10 | * with the License. You may obtain a copy of the License at |
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11 | * |
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12 | * http://www.apache.org/licenses/LICENSE-2.0 |
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13 | * |
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14 | * Unless required by applicable law or agreed to in writing, |
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15 | * software distributed under the License is distributed on an |
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16 | * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY |
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17 | * KIND, either express or implied. See the License for the |
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18 | * specific language governing permissions and limitations |
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19 | * under the License. |
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20 | */ |
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21 | ||
22 | import java.util.Hashtable; |
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23 | import java.util.List; |
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24 | ||
25 | import org.apache.torque.engine.EngineException; |
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26 | ||
27 | /** |
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28 | * A name generation factory. |
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29 | * |
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30 | * @author <a href="mailto:dlr@finemaltcoding.com>Daniel Rall</a> |
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31 | * @version $Id: NameFactory.java 473814 2006-11-11 22:30:30Z tv $ |
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32 | */ |
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33 | public class NameFactory |
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34 | { |
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35 | /** |
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36 | * The fully qualified class name of the Java name generator. |
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37 | */ |
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38 | 63 | public static final String JAVA_GENERATOR = |
39 | 126 | JavaNameGenerator.class.getName(); |
40 | ||
41 | /** |
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42 | * The fully qualified class name of the constraint name generator. |
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43 | */ |
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44 | 63 | public static final String CONSTRAINT_GENERATOR = |
45 | ConstraintNameGenerator.class.getName(); |
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46 | ||
47 | /** |
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48 | * The single instance of this class. |
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49 | */ |
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50 | 63 | private static NameFactory instance = new NameFactory(); |
51 | ||
52 | /** |
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53 | * The cache of <code>NameGenerator</code> algorithms in use for |
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54 | * name generation, keyed by fully qualified class name. |
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55 | */ |
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56 | private Hashtable algorithms; |
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57 | ||
58 | /** |
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59 | * Creates a new instance with storage for algorithm implementations. |
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60 | */ |
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61 | protected NameFactory() |
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62 | 63 | { |
63 | 63 | algorithms = new Hashtable(5); |
64 | 63 | } |
65 | ||
66 | /** |
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67 | * Factory method which retrieves an instance of the named generator. |
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68 | * |
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69 | * @param name The fully qualified class name of the name |
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70 | * generation algorithm to retrieve. |
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71 | * @return A name generator |
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72 | */ |
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73 | protected NameGenerator getAlgorithm(String name) |
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74 | throws EngineException |
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75 | { |
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76 | 14399 | synchronized (algorithms) |
77 | { |
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78 | 14399 | NameGenerator algorithm = (NameGenerator) algorithms.get(name); |
79 | 14399 | if (algorithm == null) |
80 | { |
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81 | try |
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82 | { |
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83 | 84 | algorithm = |
84 | (NameGenerator) Class.forName(name).newInstance(); |
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85 | } |
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86 | 0 | catch (InstantiationException e) |
87 | { |
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88 | 0 | throw new EngineException("Unable to instantiate class " |
89 | + name + ": Make sure it's in your run-time classpath", e); |
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90 | } |
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91 | 7 | catch (Exception e) |
92 | { |
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93 | 7 | throw new EngineException(e); |
94 | 77 | } |
95 | 77 | algorithms.put(name, algorithm); |
96 | } |
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97 | 14392 | return algorithm; |
98 | 7 | } |
99 | } |
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100 | ||
101 | /** |
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102 | * Given a list of <code>String</code> objects, implements an |
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103 | * algorithm which produces a name. |
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104 | * |
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105 | * @param algorithmName The fully qualified class name of the |
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106 | * {@link org.apache.torque.engine.database.model.NameGenerator} |
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107 | * implementation to use to generate names. |
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108 | * @param inputs Inputs used to generate a name. |
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109 | * @return The generated name. |
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110 | * @throws EngineException an exception |
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111 | */ |
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112 | public static String generateName(String algorithmName, List inputs) |
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113 | throws EngineException |
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114 | { |
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115 | 14399 | NameGenerator algorithm = instance.getAlgorithm(algorithmName); |
116 | 14392 | return algorithm.generateName(inputs); |
117 | } |
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118 | } |
This report is generated by jcoverage, Maven and Maven JCoverage Plugin. |