001    /*
002     * Sonar, open source software quality management tool.
003     * Copyright (C) 2008-2012 SonarSource
004     * mailto:contact AT sonarsource DOT com
005     *
006     * Sonar is free software; you can redistribute it and/or
007     * modify it under the terms of the GNU Lesser General Public
008     * License as published by the Free Software Foundation; either
009     * version 3 of the License, or (at your option) any later version.
010     *
011     * Sonar is distributed in the hope that it will be useful,
012     * but WITHOUT ANY WARRANTY; without even the implied warranty of
013     * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
014     * Lesser General Public License for more details.
015     *
016     * You should have received a copy of the GNU Lesser General Public
017     * License along with Sonar; if not, write to the Free Software
018     * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02
019     */
020    package org.sonar.batch.bootstrapper;
021    
022    import java.io.*;
023    
024    public final class BootstrapperIOUtils {
025    
026      private BootstrapperIOUtils() {
027        // only static methods
028      }
029    
030      /**
031       * The default buffer size to use.
032       */
033      private static final int DEFAULT_BUFFER_SIZE = 1024 * 4;
034    
035      /**
036       * Unconditionally close a <code>Closeable</code>.
037       */
038      public static void closeQuietly(Closeable closeable) {
039        try {
040          if (closeable != null) {
041            closeable.close();
042          }
043        } catch (IOException ioe) { // NOSONAR
044        }
045      }
046    
047      /**
048       * Get the contents of a <code>Reader</code> as a String.
049       */
050      public static String toString(Reader input) throws IOException {
051        StringWriter sw = new StringWriter();
052        copyLarge(input, sw);
053        return sw.toString();
054      }
055    
056      /**
057       * Copy bytes from an <code>InputStream</code> to an <code>OutputStream</code>.
058       */
059      public static long copyLarge(InputStream input, OutputStream output) throws IOException {
060        byte[] buffer = new byte[DEFAULT_BUFFER_SIZE];
061        long count = 0;
062        int n = 0;
063        while (-1 != (n = input.read(buffer))) {
064          output.write(buffer, 0, n);
065          count += n;
066        }
067        return count;
068      }
069    
070      /**
071       * Copy chars from a <code>Reader</code> to a <code>Writer</code>.
072       */
073      public static long copyLarge(Reader input, Writer output) throws IOException {
074        char[] buffer = new char[DEFAULT_BUFFER_SIZE];
075        long count = 0;
076        int n = 0;
077        while (-1 != (n = input.read(buffer))) {
078          output.write(buffer, 0, n);
079          count += n;
080        }
081        return count;
082      }
083    
084      /**
085       * Deletes a file (not a directory).
086       */
087      public static boolean deleteFileQuietly(File file) {
088        if (file == null) {
089          return false;
090        }
091        try {
092          return file.delete();
093        } catch (Exception e) {
094          return false;
095        }
096      }
097    
098    }