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org.apache.torque.engine.database.model.ConstraintNameGenerator |
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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.List; |
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20 | ||
21 | import org.apache.commons.logging.Log; |
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22 | import org.apache.commons.logging.LogFactory; |
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23 | ||
24 | import org.apache.torque.engine.EngineException; |
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25 | ||
26 | /** |
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27 | * A <code>NameGenerator</code> implementation for table-specific |
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28 | * constraints. Conforms to the maximum column name length for the |
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29 | * type of database in use. |
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30 | * |
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31 | * @author <a href="mailto:dlr@finemaltcoding.com>Daniel Rall</a> |
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32 | * @version $Id: ConstraintNameGenerator.java 239624 2005-08-24 12:18:03Z henning $ |
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33 | */ |
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34 | 2 | public class ConstraintNameGenerator implements NameGenerator |
35 | { |
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36 | /** Logging class from commons.logging */ |
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37 | 18 | private static Log log = LogFactory.getLog(ConstraintNameGenerator.class); |
38 | ||
39 | /** |
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40 | * First element of <code>inputs</code> should be of type {@link |
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41 | * org.apache.torque.engine.database.model.Database}, second |
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42 | * should be a table name, third is the type identifier (spared if |
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43 | * trimming is necessary due to database type length constraints), |
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44 | * and the fourth is a <code>Integer</code> indicating the number |
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45 | * of this contraint. |
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46 | * |
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47 | * @see org.apache.torque.engine.database.model.NameGenerator |
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48 | */ |
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49 | public String generateName(List inputs) |
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50 | throws EngineException |
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51 | { |
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52 | 32 | StringBuffer name = new StringBuffer(); |
53 | 32 | Database db = (Database) inputs.get(0); |
54 | 32 | name.append((String) inputs.get(1)); |
55 | 32 | String namePostfix = (String) inputs.get(2); |
56 | 32 | String constraintNbr = inputs.get(3).toString(); |
57 | ||
58 | // Calculate maximum RDBMS-specific column character limit. |
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59 | 32 | int maxBodyLength = -1; |
60 | try |
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61 | { |
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62 | 32 | int maxColumnNameLength = db.getPlatform().getMaxColumnNameLength(); |
63 | 32 | maxBodyLength = (maxColumnNameLength - namePostfix.length() |
64 | - constraintNbr.length() - 2); |
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65 | ||
66 | 32 | if (log.isDebugEnabled()) |
67 | { |
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68 | 0 | log.debug("maxColumnNameLength=" + maxColumnNameLength |
69 | + " maxBodyLength=" + maxBodyLength); |
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70 | } |
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71 | } |
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72 | 0 | catch (NumberFormatException maxLengthUnknown) |
73 | { |
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74 | 32 | } |
75 | ||
76 | // Do any necessary trimming. |
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77 | 32 | if (maxBodyLength != -1 && name.length() > maxBodyLength) |
78 | { |
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79 | 3 | name.setLength(maxBodyLength); |
80 | } |
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81 | ||
82 | 32 | name.append(STD_SEPARATOR_CHAR).append(namePostfix) |
83 | .append(STD_SEPARATOR_CHAR).append(constraintNbr); |
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84 | ||
85 | 32 | return name.toString(); |
86 | } |
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87 | } |
This report is generated by jcoverage, Maven and Maven JCoverage Plugin. |