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org.apache.torque.oid.IDGeneratorFactory |
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1 | package org.apache.torque.oid; |
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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 org.apache.torque.adapter.DB; |
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20 | import org.apache.torque.adapter.IDMethod; |
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21 | ||
22 | /** |
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23 | * A factory which instantiates {@link |
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24 | * org.apache.torque.oid.IdGenerator} implementations. |
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25 | * |
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26 | * @author <a href="mailto:dlr@collab.net">Daniel Rall</a> |
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27 | * @version $Id: IDGeneratorFactory.java 239630 2005-08-24 12:25:32Z henning $ |
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28 | */ |
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29 | 0 | public class IDGeneratorFactory |
30 | { |
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31 | /** |
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32 | * The list of ID generation method types which have associated |
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33 | * {@link org.apache.torque.oid.IdGenerator} implementations. |
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34 | */ |
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35 | 1 | public static final String[] ID_GENERATOR_METHODS = |
36 | { |
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37 | IDMethod.NATIVE, IDMethod.AUTO_INCREMENT, IDMethod.SEQUENCE |
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38 | }; |
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39 | ||
40 | /** |
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41 | * Factory method which instantiates {@link |
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42 | * org.apache.torque.oid.IdGenerator} implementations based on the |
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43 | * return value of the provided adapter's {@link |
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44 | * org.apache.torque.adapter.DB#getIDMethodType()} method. |
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45 | * Returns <code>null</code> for unknown types. |
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46 | * |
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47 | * @param dbAdapter The type of adapter to create an ID generator for. |
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48 | * @return The appropriate ID generator (possibly <code>null</code>). |
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49 | */ |
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50 | public static IdGenerator create(DB dbAdapter, String name) |
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51 | { |
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52 | 3 | String idMethod = dbAdapter.getIDMethodType(); |
53 | 3 | if (IDMethod.AUTO_INCREMENT.equals(idMethod)) |
54 | { |
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55 | 3 | return new AutoIncrementIdGenerator(dbAdapter, name); |
56 | } |
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57 | 0 | else if (IDMethod.SEQUENCE.equals(idMethod)) |
58 | { |
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59 | 0 | return new SequenceIdGenerator(dbAdapter, name); |
60 | } |
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61 | else |
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62 | { |
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63 | 0 | return null; |
64 | } |
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65 | } |
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66 | } |
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