jatoo.exec.InputStreamExhausterWithDumpStream.java Source code

Introduction

Here is the source code for jatoo.exec.InputStreamExhausterWithDumpStream.java

Source

/*
 * Copyright (C) 2014 Cristian Sulea ( http://cristian.sulea.net )
 * 
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 * 
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Lesser General Public License for more details.
 * 
 * You should have received a copy of the GNU Lesser General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

package jatoo.exec;

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.io.OutputStreamWriter;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

/**
 * A class that will exhaust a provided {@link InputStream} but dumping the
 * contents to a specified stream..
 * 
 * @author <a href="http://cristian.sulea.net" rel="author">Cristian Sulea</a>
 * @version 1.6, July 25, 2014
 */
public class InputStreamExhausterWithDumpStream implements Runnable {

    private static final Log LOGGER = LogFactory.getLog(InputStreamExhausterWithDumpStream.class);

    private final InputStream processInputStream;
    private final OutputStream dumpOutputStream;
    private final boolean closeDumpOutputStream;

    public InputStreamExhausterWithDumpStream(final InputStream processInputStream,
            final OutputStream dumpOutputStream, final boolean closeDumpOutputStream) {
        this.processInputStream = processInputStream;
        this.dumpOutputStream = dumpOutputStream;
        this.closeDumpOutputStream = closeDumpOutputStream;
    }

    public final void exhaust() {

        BufferedReader processInputStreamReader = null;
        BufferedWriter dumpOutputStreamWriter = null;

        try {

            processInputStreamReader = new BufferedReader(new InputStreamReader(processInputStream));
            dumpOutputStreamWriter = new BufferedWriter(new OutputStreamWriter(dumpOutputStream));

            String line = null;
            while ((line = processInputStreamReader.readLine()) != null) {

                dumpOutputStreamWriter.write(line);
                dumpOutputStreamWriter.newLine();

                dumpOutputStreamWriter.flush();
            }
        }

        catch (IOException e) {
            LOGGER.error("error exhausting the stream", e);
        }

        finally {
            if (closeDumpOutputStream && dumpOutputStreamWriter != null) {
                try {
                    dumpOutputStreamWriter.close();
                } catch (IOException e) {
                    LOGGER.error("error closing the dump stream", e);
                }
            }
        }
    }

    @Override
    public final void run() {
        exhaust();
    }

}