SmallFileSubstitutionHandler.java

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

import java.io.BufferedWriter;
import java.io.CharArrayReader;
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.
 * Its handles the small files which can be processed differently for faster
 * and better performance comparative to larger files.
 */
public class SmallFileSubstitutionHandler extends FileSubstitutionHandler {
    /**
     * Constructs the {@link SmallFileSubstitutionHandler} for the given input file.
     *
     * @param file Input file.
     * @throws FileNotFoundException If file is not found.
     */
    public SmallFileSubstitutionHandler(File file)throws FileNotFoundException {
        super(file);
    }

    @Override
    public Reader getReader() {
        try {
            if (_reader == null) {
                char[] buffer = new char[(int)_inputFile.length()];
                int count = 0;
                try {
                    _reader = new InputStreamReader(new FileInputStream(_inputFile));
                    count = _reader.read(buffer);
                } finally {
                    _reader.close();
                }
                _reader = new CharArrayReader(buffer, 0, count);
            }
        } catch (IOException e) {
            _logger.log(Level.WARNING, _strings.get("invalidFileLocation", _inputFile.getAbsolutePath()), e);
        }
        return _reader;
    }

    @Override
    public Writer getWriter() {
        try {
            _writer = new BufferedWriter(new OutputStreamWriter(new FileOutputStream(_inputFile)));
        } catch (FileNotFoundException e) {
            _logger.log(Level.WARNING, _strings.get("invalidFileLocation", _inputFile.getAbsolutePath()), e);
        }
        return _writer;
    }
}