View Javadoc

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)
105       throws IOException {
106     for (int i = 0; i < replacement.length; i++) {
107       os.write(replacement[i].getBytes());
108       os.write(lineTerminator.getBytes());
109     }
110   }
111 }