FileConverter


1   
2   /*
3    * Copyright (c) 1998 - 2005 Versant Corporation
4    * All rights reserved. This program and the accompanying materials
5    * are made available under the terms of the Eclipse Public License v1.0
6    * which accompanies this distribution, and is available at
7    * http://www.eclipse.org/legal/epl-v10.html
8    *
9    * Contributors:
10   * Versant Corporation - initial API and implementation
11   */
12  package com.versant.core.jdbc.sql.conv;
13  
14  import com.versant.core.jdbc.JdbcConverter;
15  import com.versant.core.jdbc.JdbcConverterFactory;
16  import com.versant.core.jdbc.JdbcTypeRegistry;
17  import com.versant.core.jdbc.metadata.JdbcColumn;
18  
19  import javax.jdo.JDOFatalDataStoreException;    //todo: appears only in throws clause
20  import java.sql.PreparedStatement  ;
21  import java.sql.SQLException  ;
22  import java.sql.ResultSet  ;
23  import java.io.File  ;
24  
25  /**
26   * This converter converts java.io.File objects to and from SQL. It assumes
27   * that the File is stored in a column compatible with ResultSet.getString and
28   * PreparedStatement.setString.
29   * @keep-all
30   */
31  public class FileConverter extends TypeAsStringConverterBase {
32  
33      public static class Factory extends NoArgJdbcConverterFactory {
34  
35          private FileConverter converter;
36  
37          /**
38           * Create a converter for col using args as parameters. Return null if
39           * no converter is required.
40           */
41          public JdbcConverter createJdbcConverter(JdbcColumn col, Object   args,
42                  JdbcTypeRegistry jdbcTypeRegistry) {
43              if (converter == null) converter = new FileConverter();
44              return converter;
45          }
46  
47      }
48  
49      /**
50       * Create an instance of our type from a String.
51       * @param s String to use (never null)
52       */
53      protected Object   fromString(String   s) {
54          return new File  (s);
55      }
56  
57      /**
58       * Get the type of our expected value objects (e.g. java.util.Locale
59       * for a converter for Locale's).
60       */
61      public Class   getValueType() {
62          return File  .class;
63      }
64  
65  }
66  
67
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