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annotate src/main/java/nl/cwi/monetdb/util/Extract.java @ 0:a5a898f6886c

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Copy of MonetDB java directory changeset e6e32756ad31.
author Sjoerd Mullender <sjoerd@acm.org>
date Wed, 21 Sep 2016 09:34:48 +0200 (2016-09-21)
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children 57978db4ee57 b9b35ca2eec2
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1 /*
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2 * This Source Code Form is subject to the terms of the Mozilla Public
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3 * License, v. 2.0. If a copy of the MPL was not distributed with this
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4 * file, You can obtain one at http://mozilla.org/MPL/2.0/.
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5 *
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6 * Copyright 1997 - July 2008 CWI, August 2008 - 2016 MonetDB B.V.
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7 */
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8
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9 package nl.cwi.monetdb.util;
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10
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11 import java.io.BufferedReader;
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12 import java.io.FileNotFoundException;
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13 import java.io.FileWriter;
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14 import java.io.IOException;
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15 import java.io.InputStream;
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16 import java.io.InputStreamReader;
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17
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18
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19 /**
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20 * This file contains a function to extract files from its including Jar
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21 * package.
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22 *
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23 * @author Ying Zhang <Y.Zhang@cwi.nl>
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24 * @version 0.1
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25 */
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27 public class Extract {
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28 private static final int DEFAULT_BUFSIZE = 16386;
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29
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30 public Extract() {}
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31
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32 /**
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33 * Extracts a file from the Jar package which includes this class to
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34 * the given destination
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35 * @param fromFile The file to extract, including it absolute path
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36 * inside its including Jar package.
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37 * @param toFile Destination for the extracted file
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38 * @throws FileNotFoundException If the file to extract can not be
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39 * found in its including Jar package.
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40 * @throws IOException If any error happens during
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41 * creating/reading/writing files.
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42 */
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43 public static void extractFile(String fromFile, String toFile)
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44 throws FileNotFoundException, IOException
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45 {
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46 char[] cbuf = new char[DEFAULT_BUFSIZE];
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47 int ret = 0;
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48
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49 InputStream is = new Extract().getClass().getResourceAsStream(fromFile);
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50
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51 if(is == null) {
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52 throw new FileNotFoundException("File " + fromFile +
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53 " does not exist in the JAR package.");
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54 }
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55
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56 BufferedReader reader = new BufferedReader(new InputStreamReader(is));
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57 FileWriter writer = new FileWriter(toFile, false);
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58
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59 ret = reader.read(cbuf, 0, DEFAULT_BUFSIZE);
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60 while(ret > 0){
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61 writer.write(cbuf, 0, ret);
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62 ret = reader.read(cbuf, 0, DEFAULT_BUFSIZE);
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63 }
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64 reader.close();
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65 writer.close();
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66 }
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67 }