| 1 | /* |
| 2 | |
| 3 | Derby - Class org.apache.derby.impl.sql.GenericLanguageFactory |
| 4 | |
| 5 | Copyright 1997, 2004 The Apache Software Foundation or its licensors, as applicable. |
| 6 | |
| 7 | Licensed under the Apache License, Version 2.0 (the "License"); |
| 8 | you may not use this file except in compliance with the License. |
| 9 | You may obtain a copy of the License at |
| 10 | |
| 11 | http://www.apache.org/licenses/LICENSE-2.0 |
| 12 | |
| 13 | Unless required by applicable law or agreed to in writing, software |
| 14 | distributed under the License is distributed on an "AS IS" BASIS, |
| 15 | WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 16 | See the License for the specific language governing permissions and |
| 17 | limitations under the License. |
| 18 | |
| 19 | */ |
| 20 | |
| 21 | package org.apache.derby.impl.sql; |
| 22 | |
| 23 | import org.apache.derby.iapi.services.property.PropertyFactory; |
| 24 | import org.apache.derby.iapi.store.access.AccessFactory; |
| 25 | import org.apache.derby.iapi.store.access.TransactionController; |
| 26 | import org.apache.derby.iapi.sql.LanguageFactory; |
| 27 | import org.apache.derby.iapi.sql.ParameterValueSet; |
| 28 | import org.apache.derby.iapi.sql.ResultDescription; |
| 29 | import org.apache.derby.iapi.sql.ResultColumnDescriptor; |
| 30 | import org.apache.derby.iapi.sql.Row; |
| 31 | |
| 32 | import org.apache.derby.iapi.services.monitor.Monitor; |
| 33 | import org.apache.derby.iapi.services.monitor.ModuleControl; |
| 34 | import org.apache.derby.iapi.error.StandardException; |
| 35 | |
| 36 | import org.apache.derby.iapi.sql.conn.LanguageConnectionFactory; |
| 37 | import org.apache.derby.iapi.services.loader.ClassInspector; |
| 38 | |
| 39 | import org.apache.derby.iapi.services.io.FormatIdUtil; |
| 40 | |
| 41 | import java.util.Properties; |
| 42 | |
| 43 | /** |
| 44 | The LanguageFactory provides system-wide services that |
| 45 | are available on the Database API. |
| 46 | |
| 47 | @author ames |
| 48 | */ |
| 49 | public class GenericLanguageFactory implements LanguageFactory, ModuleControl |
| 50 | { |
| 51 | |
| 52 | private GenericParameterValueSet emptySet; |
| 53 | |
| 54 | public GenericLanguageFactory() { } |
| 55 | |
| 56 | /* |
| 57 | ModuleControl interface |
| 58 | */ |
| 59 | |
| 60 | /** |
| 61 | * Start-up method for this instance of the language factory. |
| 62 | * This service is expected to be started and accessed relative |
| 63 | * to a database. |
| 64 | * |
| 65 | * @param startParams The start-up parameters (ignored in this case) |
| 66 | |
| 67 | @exception StandardException Thrown if module cannot be booted. |
| 68 | * |
| 69 | */ |
| 70 | public void boot(boolean create, Properties startParams) throws StandardException |
| 71 | { |
| 72 | LanguageConnectionFactory lcf = (LanguageConnectionFactory) Monitor.findServiceModule(this, LanguageConnectionFactory.MODULE); |
| 73 | PropertyFactory pf = lcf.getPropertyFactory(); |
| 74 | if (pf != null) |
| 75 | pf.addPropertySetNotification(new LanguageDbPropertySetter()); |
| 76 | |
| 77 | emptySet = new GenericParameterValueSet(null, 0, false); |
| 78 | } |
| 79 | |
| 80 | /** |
| 81 | * Stop this module. In this case, nothing needs to be done. |
| 82 | */ |
| 83 | |
| 84 | public void stop() { |
| 85 | } |
| 86 | |
| 87 | /* LanguageFactory methods */ |
| 88 | |
| 89 | /** |
| 90 | * Factory method for getting a ParameterValueSet |
| 91 | * |
| 92 | * @see LanguageFactory#newParameterValueSet |
| 93 | */ |
| 94 | public ParameterValueSet newParameterValueSet(ClassInspector ci, int numParms, boolean hasReturnParam) |
| 95 | { |
| 96 | if (numParms == 0) |
| 97 | return emptySet; |
| 98 | |
| 99 | return new GenericParameterValueSet(ci, numParms, hasReturnParam); |
| 100 | } |
| 101 | |
| 102 | /** |
| 103 | * Get a new result description from the input result |
| 104 | * description. Picks only the columns in the column |
| 105 | * array from the inputResultDescription. |
| 106 | * |
| 107 | * @param inputResultDescription the input rd |
| 108 | * @param theCols array of ints, non null |
| 109 | * |
| 110 | * @return ResultDescription the rd |
| 111 | */ |
| 112 | public ResultDescription getResultDescription |
| 113 | ( |
| 114 | ResultDescription inputResultDescription, |
| 115 | int[] theCols |
| 116 | ) |
| 117 | { |
| 118 | return new GenericResultDescription(inputResultDescription, theCols); |
| 119 | } |
| 120 | |
| 121 | /** |
| 122 | * Get a new result description |
| 123 | * |
| 124 | * @param cols an array of col descriptors |
| 125 | * @param type the statement type |
| 126 | * |
| 127 | * @return ResultDescription the rd |
| 128 | */ |
| 129 | public ResultDescription getResultDescription |
| 130 | ( |
| 131 | ResultColumnDescriptor[] cols, |
| 132 | String type |
| 133 | ) |
| 134 | { |
| 135 | return new GenericResultDescription(cols, type); |
| 136 | } |
| 137 | |
| 138 | /* |
| 139 | ** REMIND: we will need a row and column factory |
| 140 | ** when we make putResultSets available for users' |
| 141 | ** server-side JDBC methods. |
| 142 | */ |
| 143 | } |