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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 (String s : replacement) {
106             os.write(s.getBytes());
107             os.write(lineTerminator.getBytes());
108         }
109     }
110 }