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/* ========================================================================
* PlantUML : a free UML diagram generator
* ========================================================================
*
* (C) Copyright 2009-2014, Arnaud Roques
*
* Project Info: http://plantuml.sourceforge.net
*
* This file is part of PlantUML.
*
* Licensed under The MIT License (Massachusetts Institute of Technology License)
*
* See http://opensource.org/licenses/MIT
*
* Permission is hereby granted, free of charge, to any person obtaining
* a copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included
* in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
* WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR
* IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*
*
* Original Author: Arnaud Roques
*/
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 MetadataTag {
private final File f;
private final String tag;
public MetadataTag(File f, String tag) {
this.f = f;
this.tag = tag;
}
public String getData() throws IOException {
final ImageInputStream iis = ImageIO.createImageInputStream(f);
final Iterator<ImageReader> 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++) {
final String result = displayMetadata(metadata.getAsTree(names[i]));
if (result != null) {
return result;
}
}
}
return null;
}
private String displayMetadata(Node root) {
return displayMetadata(root, 0);
}
private String displayMetadata(Node node, int level) {
final NamedNodeMap map = node.getAttributes();
if (map != null) {
final Node keyword = map.getNamedItem("keyword");
if (keyword != null && tag.equals(keyword.getNodeValue())) {
final Node text = map.getNamedItem("value");
if (text != null) {
return text.getNodeValue();
}
}
}
Node child = node.getFirstChild();
// children, so close current tag
while (child != null) {
// print children recursively
final String result = displayMetadata(child, level + 1);
if (result != null) {
return result;
}
child = child.getNextSibling();
}
return null;
}
}
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