1 /*
2 * Copyright (c) 2004 International Decision Systems, Inc. All Rights Reserved.
3 *
4 * By using this Software, You acknowledge that the Software is a valuable asset
5 * and trade secret of either International Decision Systems, Inc. ("IDSI") or a
6 * third party supplier of IDSI and constitutes confidential and proprietary
7 * information.
8 *
9 * NEITHER IDSI NOR ANY AGENT OR PERSON ACTING FOR OR WITH IDSI HAS MADE OR DOES
10 * MAKE ANY STATEMENTS, AFFIRMATIONS, REPRESENTATIONS OR WARRANTIES WHATSOEVER
11 * TO YOU, WHETHER EXPRESS OR IMPLIED, AS TO THE SOFTWARE, THE QUALITY OR
12 * CONDITION OF THE SOFTWARE, OR THE OPERATING CHARACTERISTICS OR RELIABILITY OF
13 * THE SOFTWARE, OR ITS SUITABILITY FOR ANY GENERAL OR PARTICULAR PURPOSE, OR AS
14 * TO ANY OTHER MATTER WHATSOEVER; ANY AND ALL OTHER WARRANTIES INCLUDING
15 * WITHOUT LIMITATION ANY WARRANTIES IMPLIED BY LAW, SUCH AS THE IMPLIED
16 * WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, AND TITLE,
17 * USE AND NON-INFRINGEMENT; ARE HEREBY EXPRESSLY DISCLAIMED AND EXCLUDED.
18 */
19 package net.sourceforge.addam.ddlrun.utils;
20
21 import java.io.*;
22 import java.util.MissingResourceException;
23
24 /**
25 * Used to read resources from within the local FileSystem.
26 *
27 * @author TIM3
28 * @since Mar 5, 2005
29 */
30 public class FileSystemReader implements ResourceReader {
31
32 /**
33 * Allows only the FileSystemReaderFactory to construct a FileSystemReader.
34 *
35 * @param resourceFile the file to read from
36 */
37 FileSystemReader(File resourceFile) {
38 this.resourceFile = resourceFile;
39 }
40
41 public String readLine() throws IOException {
42 return this.getReader().readLine();
43 }
44
45 private BufferedReader getReader() {
46 if (reader == null) {
47 try {
48 reader = new BufferedReader(new FileReader(resourceFile));
49 } catch (FileNotFoundException e) {
50 throw new MissingResourceException("FileSystemReader unable to locate resource " + resourceFile,
51 FileSystemReader.class.getName(), resourceFile.toString());
52 }
53 }
54 return reader;
55 }
56
57 private BufferedReader reader;
58 final File resourceFile; // not private in order to facilitate testing
59 }