com.sun.enterprise.admin.servermgmt.stringsubs.impl.LargeFileSubstitutionHandler Maven / Gradle / Ivy
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/*
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* General Public License Version 2 only ("GPL") or the Common Development
* and Distribution License("CDDL") (collectively, the "License"). You
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* https://glassfish.dev.java.net/public/CDDL+GPL_1_1.html
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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()));
}
}
}