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package com.sun.enterprise.admin.servermgmt.stringsubs.impl;

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import java.io.Reader;
import java.io.Writer;
import java.util.logging.Level;

/**
 * Creates {@link Reader} and {@link Writer} for the String substitution file.
 * Implementation is useful for large files which cann't be read entirely in a
 *  memory or need a substantial amount of memory.
 * 

* To perform substitution it take helps of temporary file to write output, after * substitution, temporary file renamed to input file. *

*/ public class LargeFileSubstitutionHandler extends FileSubstitutionHandler { private static final String BACKUP_FILE_PREFIX = ".bkp"; private static final String TEMP_FILE_PREFIX = ".tmp"; private File _outputFile; public LargeFileSubstitutionHandler(File file) throws FileNotFoundException { super(file); } @Override public Reader getReader() { try { _reader = new BufferedReader(new InputStreamReader(new FileInputStream(_inputFile))); } catch (FileNotFoundException e) { _logger.log(Level.INFO, _strings.get("invalidFileLocation", _inputFile.getAbsolutePath()) , e); } return _reader; } @Override public Writer getWriter() { _outputFile = new File(_inputFile.getAbsolutePath() + TEMP_FILE_PREFIX); try { if (!_outputFile.exists()) { if (!_outputFile.createNewFile()) { throw new IOException(); } } _writer = new BufferedWriter(new OutputStreamWriter(new FileOutputStream(_outputFile))); } catch (IOException e) { _logger.log(Level.INFO, _strings.get("failureTempFileCreation", _outputFile.getAbsolutePath(), e)); } return _writer; } @Override public void finish() { super.finish(); String inputFileName = _inputFile.getName(); File inputBackUpfile = new File(_inputFile.getAbsolutePath() + BACKUP_FILE_PREFIX); if (_inputFile.renameTo(inputBackUpfile)) { if (_outputFile.renameTo(new File(_inputFile.getAbsolutePath()))) { if (!inputBackUpfile.delete()) { _logger.log(Level.INFO, _strings.get("failureInBackUpFileDeletion", inputBackUpfile.getAbsolutePath())); } } else { _logger.log(Level.INFO, _strings.get("failureInFileRename", _outputFile.getAbsolutePath(), inputFileName)); } } else { _logger.log(Level.WARNING, _strings.get("failureInFileRename", _inputFile.getAbsolutePath(), inputBackUpfile.getName())); } } }





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