source: trunk/java-utils/src/main/java/de/ugoe/cs/util/FileTools.java @ 811

Last change on this file since 811 was 402, checked in by sherbold, 13 years ago
  • modified de.ugoe.cs.util.FileTools? such that it does not always choose \r\n as carriage return, but instead the variant used by the operating system, i.e., \n with Linux and Macs, \r\n with Windows
  • Property svn:mime-type set to text/plain
File size: 2.3 KB
Line 
1package de.ugoe.cs.util;
2
3import java.io.File;
4import java.io.FileInputStream;
5import java.io.FileNotFoundException;
6import java.io.FileReader;
7import java.io.IOException;
8import java.io.InputStreamReader;
9import java.nio.charset.Charset;
10
11/**
12 * <p>
13 * Helper class that provides methods that simplify working with files.
14 * </p>
15 *
16 * @author Steffen Herbold
17 * @version 1.0
18 */
19public class FileTools {
20
21        /**
22         * <p>
23         * Private constructor to prevent initializing of the class.
24         * </p>
25         */
26        private FileTools() {
27
28        }
29
30        /**
31         * <p>
32         * Returns an array of the lines contained in a file. The line separator is
33         * {@link StringTools#ENDLINE}.
34         * </p>
35         *
36         * @param filename
37         *            name of the file
38         * @return string array, where each line contains a file
39         * @throws IOException
40         *             see {@link FileReader#read(char[])},
41         *             {@link FileReader#close()}
42         * @throws FileNotFoundException
43         *             see {@link FileReader#FileReader(File)}
44         */
45        public static String[] getLinesFromFile(String filename)
46                        throws IOException, FileNotFoundException {
47                boolean carriageReturn = true;
48                if( StringTools.ENDLINE.equals("\n") ) {
49                        carriageReturn = false;
50                }
51                return getLinesFromFile(filename, carriageReturn);
52        }
53
54        /**
55         * <p>
56         * Returns an array of the lines contained in a file.
57         * </p>
58         *
59         * @param filename
60         *            name of the file
61         * @param carriageReturn
62         *            if true, "\r\n", if false "\n" is used as line separator
63         * @return string array, where each line contains a file
64         * @throws IOException
65         *             see {@link FileReader#read(char[])},
66         *             {@link FileReader#close()}
67         * @throws FileNotFoundException
68         *             see {@link FileReader#FileReader(File)}
69         */
70        public static String[] getLinesFromFile(String filename,
71                        boolean carriageReturn) throws IOException, FileNotFoundException {
72                File f = new File(filename);
73                FileInputStream fis = new FileInputStream(f);
74                InputStreamReader reader = new InputStreamReader(fis,
75                                Charset.defaultCharset());
76                char[] buffer = new char[(int) f.length()];
77                reader.read(buffer);
78                reader.close();
79                String splitString;
80                if (carriageReturn) {
81                        splitString = "\r\n";
82                } else {
83                        splitString = "\n";
84                }
85                return (new String(buffer)).split(splitString);
86        }
87
88}
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