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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: 5749 $
 *
 */
package net.sourceforge.plantuml;

import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.concurrent.atomic.AtomicInteger;

public class FileUtils {

	private static AtomicInteger counter;

	public static void resetCounter() {
		counter = new AtomicInteger(0);
	}

	static public File createTempFile(String prefix, String suffix) throws IOException {
		if (suffix.startsWith(".") == false) {
			throw new IllegalArgumentException();
		}
		if (prefix == null) {
			throw new IllegalArgumentException();
		}
		final File f;
		if (counter == null) {
			f = File.createTempFile(prefix, suffix);
		} else {
			final String name = prefix + counter.addAndGet(1) + suffix;
			f = new File(name);
		}
		Log.info("Creating temporary file: " + f);
		if (OptionFlags.getInstance().isKeepTmpFiles() == false) {
			f.deleteOnExit();
		}
		return f;
	}

	private static void copyInternal(final InputStream fis, final OutputStream fos) throws IOException {
		final byte[] buf = new byte[10240];
		int len;
		while ((len = fis.read(buf)) > 0) {
			fos.write(buf, 0, len);
		}
		fos.close();
		fis.close();
	}

	static public void copyToFile(File src, File dest) throws IOException {
		if (dest.isDirectory()) {
			dest = new File(dest, src.getName());
		}
		final InputStream fis = new BufferedInputStream(new FileInputStream(src));
		final OutputStream fos = new BufferedOutputStream(new FileOutputStream(dest));
		copyInternal(fis, fos);
	}

	static public void copyToStream(File src, OutputStream os) throws IOException {
		final InputStream fis = new BufferedInputStream(new FileInputStream(src));
		final OutputStream fos = new BufferedOutputStream(os);
		copyInternal(fis, fos);
	}

	static public void copyToStream(InputStream is, OutputStream os) throws IOException {
		final InputStream fis = new BufferedInputStream(is);
		final OutputStream fos = new BufferedOutputStream(os);
		copyInternal(fis, fos);
	}

	static public void copyToFile(byte[] src, File dest) throws IOException {
		final OutputStream fos = new BufferedOutputStream(new FileOutputStream(dest));
		fos.write(src);
		fos.close();
	}

}