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    1   /**
    2    * Copyright (c) 2004-2011 QOS.ch
    3    * All rights reserved.
    4    *
    5    * Permission is hereby granted, free  of charge, to any person obtaining
    6    * a  copy  of this  software  and  associated  documentation files  (the
    7    * "Software"), to  deal in  the Software without  restriction, including
    8    * without limitation  the rights to  use, copy, modify,  merge, publish,
    9    * distribute,  sublicense, and/or sell  copies of  the Software,  and to
    10   * permit persons to whom the Software  is furnished to do so, subject to
    11   * the following conditions:
    12   *
    13   * The  above  copyright  notice  and  this permission  notice  shall  be
    14   * included in all copies or substantial portions of the Software.
    15   *
    16   * THE  SOFTWARE IS  PROVIDED  "AS  IS", WITHOUT  WARRANTY  OF ANY  KIND,
    17   * EXPRESS OR  IMPLIED, INCLUDING  BUT NOT LIMITED  TO THE  WARRANTIES OF
    18   * MERCHANTABILITY,    FITNESS    FOR    A   PARTICULAR    PURPOSE    AND
    19   * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
    20   * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
    21   * OF CONTRACT, TORT OR OTHERWISE,  ARISING FROM, OUT OF OR IN CONNECTION
    22   * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
    23   *
    24   */
    25  package org.slf4j.migrator;
    26
    27  import java.io.BufferedReader;
    28  import java.io.ByteArrayInputStream;
    29  import java.io.ByteArrayOutputStream;
    30  import java.io.File;
    31  import java.io.FileInputStream;
    32  import java.io.FileOutputStream;
    33  import java.io.IOException;
    34  import java.io.InputStreamReader;
    35  import java.io.OutputStream;
    36  import java.io.Reader;
    37
    38  import org.slf4j.migrator.internal.ProgressListener;
    39  import org.slf4j.migrator.line.LineConverter;
    40  import org.slf4j.migrator.line.RuleSet;
    41
    42  public class InplaceFileConverter {
    43
    44      final static int BUFFER_LEN = 8 * 1024;
    45      final LineConverter lineConverter;
    46      final String lineTerminator;
    47      final ProgressListener pl;
    48
    49      InplaceFileConverter(RuleSet ruleSet, ProgressListener pl) {
    50          this.lineConverter = new LineConverter(ruleSet);
    51          lineTerminator = System.getProperty("line.separator");
    52          this.pl = pl;
    53      }
    54
    55      private byte[] readIntoByteArray(File file) throws IOException {
    56          FileInputStream fis = new FileInputStream(file);
    57          ByteArrayOutputStream baos = new ByteArrayOutputStream();
    58          int n = 0;
    59          byte[] buffer = new byte[BUFFER_LEN];
    60          while ((n = fis.read(buffer)) != -1) {
    61              // System.out.println("ba="+new String(buffer, "UTF-8"));
    62              baos.write(buffer, 0, n);
    63          }
    64          fis.close();
    65          return baos.toByteArray();
    66      }
    67
    68      void convert(File file) throws IOException {
    69          byte[] originalBytes = readIntoByteArray(file);
    70          byte[] convertedBytes = convertIntoTempByteArray(originalBytes);
    71          if (lineConverter.atLeastOneMatchOccured()) {
    72              // System.out.println("Converting ["+file+"]");
    73              writeConvertedBytesIntoFile(file, convertedBytes);
    74              pl.onInplaceConversion(file);
    75          } else {
    76              // System.out.println("Not touching ["+file+"]");
    77          }
    78      }
    79
    80      private void writeConvertedBytesIntoFile(File file, byte[] convertedBytes) throws IOException {
    81          FileOutputStream fos = new FileOutputStream(file);
    82          fos.write(convertedBytes);
    83          fos.flush();
    84          fos.close();
    85      }
    86
    87      private byte[] convertIntoTempByteArray(byte[] input) throws IOException {
    88          ByteArrayInputStream bais = new ByteArrayInputStream(input);
    89          Reader reader = new InputStreamReader(bais);
    90          BufferedReader breader = new BufferedReader(reader);
    91          ByteArrayOutputStream baos = new ByteArrayOutputStream();
    92          while (true) {
    93              String line = breader.readLine();
    94              if (line != null) {
    95                  String[] replacement = lineConverter.getReplacement(line);
    96                  writeReplacement(baos, replacement);
    97              } else {
    98                  break;
    99              }
    100         }
    101         return baos.toByteArray();
    102     }
    103
    104     private void writeReplacement(OutputStream os, String[] replacement) throws IOException {
    105         for (int i = 0; i < replacement.length; i++) {
    106             os.write(replacement[i].getBytes());
    107             os.write(lineTerminator.getBytes());
    108         }
    109     }
    110 }