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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: 9786 $
 *
 */
package net.sourceforge.plantuml.png;

import java.io.File;
import java.io.IOException;
import java.util.Iterator;

import javax.imageio.ImageIO;
import javax.imageio.ImageReader;
import javax.imageio.metadata.IIOMetadata;
import javax.imageio.stream.ImageInputStream;

import org.w3c.dom.NamedNodeMap;
import org.w3c.dom.Node;

public class Metadata {

	public static void main(String[] args) throws IOException {
		final Metadata meta = new Metadata();
		final int length = args.length;
		for (int i = 0; i < length; i++) {
			meta.readAndDisplayMetadata(new File(args[i]));
		}
	}

	public void readAndDisplayMetadata(File file) throws IOException {
		final ImageInputStream iis = ImageIO.createImageInputStream(file);
		final Iterator readers = ImageIO.getImageReaders(iis);

		if (readers.hasNext()) {
			// pick the first available ImageReader
			final ImageReader reader = readers.next();

			// attach source to the reader
			reader.setInput(iis, true);

			// read metadata of first image
			final IIOMetadata metadata = reader.getImageMetadata(0);

			final String[] names = metadata.getMetadataFormatNames();
			final int length = names.length;
			for (int i = 0; i < length; i++) {
				displayMetadata(metadata.getAsTree(names[i]));
			}
		}
	}

	private void displayMetadata(Node root) {
		displayMetadata(root, 0);
	}

	private void indent(int level) {
		for (int i = 0; i < level; i++) {
			System.out.print("    ");
		}
	}

	private void displayMetadata(Node node, int level) {
		// print open tag of element
		indent(level);
		System.out.print("<" + node.getNodeName());
		final NamedNodeMap map = node.getAttributes();
		if (map != null) {

			// print attribute values
			final int length = map.getLength();
			for (int i = 0; i < length; i++) {
				final Node attr = map.item(i);
				System.out.print(" " + attr.getNodeName() + "=\"" + attr.getNodeValue() + "\"");
			}
		}

		Node child = node.getFirstChild();
		if (child == null) {
			// no children, so close element and return
			System.out.println("/>");
			return;
		}

		// children, so close current tag
		System.out.println(">");
		while (child != null) {
			// print children recursively
			displayMetadata(child, level + 1);
			child = child.getNextSibling();
		}

		// print close tag of element
		indent(level);
		System.out.println("");
	}

}