1 /*
2 * Zemucan: A Syntax Assistant for DB2
3 * Copyright (C) 2009, 2010 Andres Gomez Casanova
4 *
5 * This file is part of Zemucan.
6 *
7 * Zemucan is free software: you can redistribute it and/or modify
8 * it under the terms of the GNU Lesser General Public License as published by
9 * the Free Software Foundation; either version 3 of the License, or
10 * (at your option) any later version.
11 *
12 * Zemucan is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU Lesser General Public License for more details.
16 *
17 * You should have received a copy of the GNU Lesser General Public License
18 * along with this library; if not, see <http://www.gnu.org/licenses/>.
19 *
20 * Contact:
21 * a n g o c a at y a h o o dot c o m
22 * Cra. 45 No 61 - 31, Bogota, Colombia.
23 *
24 * Author: $LastChangedBy: angoca $:
25 * Date: $LastChangedDate: 2011-03-06 10:15:32 -0500 (dom, 06 mar 2011) $:
26 * Revision: $LastChangedRevision: 1913 $:
27 * URL: $HeadURL: https://zemucan.svn.sourceforge.net/svnroot/zemucan/branches/zemucan_v1/source-code/tools/src/main/java/name/angoca/zemucan/tools/file/FileReader.java $:
28 */
29 package name.angoca.zemucan.tools.file;
30
31 import java.io.File;
32 import java.io.FileInputStream;
33 import java.io.IOException;
34 import java.io.InputStream;
35 import java.net.URL;
36
37 import name.angoca.zemucan.AbstractZemucanException;
38
39 /**
40 * Abstract exception that defines a problem while reading a file.
41 * <p>
42 * <b>Control Version</b>
43 * <p>
44 * <ul>
45 * <li>1.0.0 Class creation.</li>
46 * </ul>
47 *
48 * @author Andres Gomez Casanova <a
49 * href="mailto:a n g o c a at y a h o o dot c o m">(AngocA)</a>
50 * @version 1.0.0 2010-08-22
51 */
52 public class FileReader {
53 /**
54 * Returns the stream that corresponds to the requested file.
55 *
56 * @param fileName
57 * Name of the file.
58 * @return The stream of the requested file.
59 * @throws AbstractZemucanException
60 * If there is a problem while retrieving the content.
61 */
62 public static InputStream/* ! */getStream(final String/* ! */fileName)
63 throws AbstractZemucanException {
64 if (fileName == null) {
65 throw new FileNotDefinedException();
66 }
67
68 InputStream inputStream = null;
69
70 final ClassLoader loader = ClassLoader.getSystemClassLoader();
71 if (loader != null) {
72 URL url = loader.getResource(fileName);
73 if (url == null) {
74 url = loader.getResource("/" + fileName);
75 }
76 if (url != null) {
77 try {
78 inputStream = url.openStream();
79 } catch (final IOException exception) {
80 throw new CorruptFileException(exception);
81 }
82 } else {
83 final File file = new File(fileName);
84 if (file.exists()) {
85 try {
86 inputStream = new FileInputStream(file);
87 } catch (final java.io.FileNotFoundException e) {
88 throw new name.angoca.zemucan.tools.file.FileNotFoundException(
89 fileName, e);
90 }
91 } else {
92 throw new name.angoca.zemucan.tools.file.FileNotFoundException(
93 fileName);
94 }
95 }
96 }
97
98 assert inputStream != null;
99 return inputStream;
100 }
101 }