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PlantUML is a component that allows to quickly write : * sequence diagram, * use case diagram, * class diagram, * activity diagram, * component diagram, * state diagram * object diagram

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/* ========================================================================
 * PlantUML : a free UML diagram generator
 * ========================================================================
 *
 * (C) Copyright 2009-2013, Arnaud Roques
 *
 * Project Info:  http://plantuml.sourceforge.net
 * 
 * This file is part of PlantUML.
 *
 * PlantUML is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * PlantUML 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 General Public
 * License for more details.
 *
 * You should have received a copy of the GNU General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301,
 * USA.
 *
 * [Java is a trademark or registered trademark of Sun Microsystems, Inc.
 * in the United States and other countries.]
 *
 * Original Author:  Arnaud Roques
 * 
 * Revision $Revision: 10765 $
 *
 */
package net.sourceforge.plantuml.cucadiagram.dot;

import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;

import net.sourceforge.plantuml.Log;

public class ProcessRunner {

	private final String[] cmd;

	private String error;
	private String out;

	public ProcessRunner(String[] cmd) {
		this.cmd = cmd;
	}

	static private int cpt = 0;

	public void run(byte in[], OutputStream redirection) throws IOException, InterruptedException {
		run(in, redirection, null);
	}

	public void run(byte in[], OutputStream redirection, File dir) throws IOException, InterruptedException {
		final Process process = Runtime.getRuntime().exec(cmd, null, dir);
		final ThreadStream errorStream = new ThreadStream(process.getErrorStream(), null);
		final ThreadStream outStream = new ThreadStream(process.getInputStream(), redirection);
		errorStream.start();
		outStream.start();
		if (in != null) {
			final OutputStream os = process.getOutputStream();
			os.write(in);
			os.close();
		}
		process.waitFor();
		errorStream.join(10000L);
		outStream.join(10000L);
		this.out = outStream.sb.toString();
		this.error = errorStream.sb.toString();
		cpt++;
		Log.info("RUN nb = " + cpt);
	}

	static class ThreadStream extends Thread {

		private final InputStream streamToRead;
		private final OutputStream redirection;
		private final StringBuilder sb = new StringBuilder();

		ThreadStream(InputStream streamToRead, OutputStream redirection) {
			this.streamToRead = streamToRead;
			this.redirection = redirection;
		}

		@Override
		public void run() {
			Log.debug("STARTING " + this);
			int read = 0;
			try {
				while ((read = streamToRead.read()) != -1) {
					if (redirection == null) {
						sb.append((char) read);
					} else {
						redirection.write(read);
					}
				}
			} catch (IOException e) {
				e.printStackTrace();
				sb.append('\n');
				sb.append(e.toString());
			}
			Log.debug("FINISHING " + this);
		}
	}

	public final String getError() {
		return error;
	}

	public final String getOut() {
		return out;
	}

}