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package de.lmu.ifi.dbs.elki.visualization.batikutil;
/*
This file is part of ELKI:
Environment for Developing KDD-Applications Supported by Index-Structures
Copyright (C) 2012
Ludwig-Maximilians-Universität München
Lehr- und Forschungseinheit für Datenbanksysteme
ELKI Development Team
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU Affero 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 Affero General Public License for more details.
You should have received a copy of the GNU Affero General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
import gnu.trove.iterator.TIntObjectIterator;
import gnu.trove.map.TIntObjectMap;
import gnu.trove.map.hash.TIntObjectHashMap;
import java.awt.image.RenderedImage;
import java.io.IOException;
import java.io.InputStream;
import java.lang.ref.SoftReference;
import java.util.Iterator;
import org.apache.batik.ext.awt.image.GraphicsUtil;
import org.apache.batik.ext.awt.image.renderable.Filter;
import org.apache.batik.ext.awt.image.renderable.RedRable;
import org.apache.batik.ext.awt.image.spi.AbstractRegistryEntry;
import org.apache.batik.ext.awt.image.spi.ImageTagRegistry;
import org.apache.batik.ext.awt.image.spi.MagicNumberRegistryEntry;
import org.apache.batik.ext.awt.image.spi.URLRegistryEntry;
import org.apache.batik.svggen.ErrorConstants;
import org.apache.batik.util.ParsedURL;
import org.apache.batik.util.ParsedURLData;
import org.apache.batik.util.ParsedURLProtocolHandler;
import de.lmu.ifi.dbs.elki.logging.Logging;
/**
* Access images via an internal image registry.
*
* @author Erich Schubert
*/
public class ThumbnailRegistryEntry extends AbstractRegistryEntry implements URLRegistryEntry, ParsedURLProtocolHandler {
/**
* ELKI internal thumbnail protocol id.
*/
public static final String INTERNAL_PROTOCOL = "thumb";
/**
* ELKI internal thumbnail protocol prefix
*/
public static final String INTERNAL_PREFIX = INTERNAL_PROTOCOL + ":";
/**
* Mime type
*/
public static final String INTERNAL_MIME_TYPE = "internal/thumb";
/**
* The priority of this entry.
*/
public static final float PRIORITY = 1 * MagicNumberRegistryEntry.PRIORITY;
/**
* The logger class.
*/
private static final Logging logger = Logging.getLogger(ThumbnailRegistryEntry.class);
/**
* The image cache.
*/
private static final TIntObjectMap<SoftReference<RenderedImage>> images = new TIntObjectHashMap<SoftReference<RenderedImage>>();
/**
* Object counter
*/
private static int counter = 1;
/**
* Constructor.
*
* Note: there will usually be two instances created. One for handling the
* image type, one for the URL handling. This is ok.
*/
public ThumbnailRegistryEntry() {
super("Internal", PRIORITY, new String[0], new String[] { INTERNAL_MIME_TYPE });
if(logger.isDebuggingFiner()) {
logger.debugFiner("Registry initialized.");
}
}
/**
* Put an image into the repository (note: the repository is only keeping a
* weak reference!)
*
* @param img Image to put
* @return Key
*/
public static int registerImage(RenderedImage img) {
synchronized(images) {
int key = counter;
counter++;
assert (images.get(key) == null);
images.put(key, new SoftReference<RenderedImage>(img));
// Reorganize map, purge old entries
if(counter % 50 == 49) {
for(TIntObjectIterator<SoftReference<RenderedImage>> iter = images.iterator(); iter.hasNext();) {
iter.advance();
if(iter.value() == null || iter.value().get() == null) {
iter.remove();
}
}
}
if(logger.isDebuggingFiner()) {
logger.debugFiner("Registered image: " + key);
}
return key;
}
}
@Override
public boolean isCompatibleURL(ParsedURL url) {
// logger.warning("isCompatible " + url.toString());
return isCompatibleURLStatic(url);
}
/**
* Test for a compatible URL.
*
* @param url URL
* @return Success code
*/
public static boolean isCompatibleURLStatic(ParsedURL url) {
return url.getProtocol().equals(INTERNAL_PROTOCOL);
}
@Override
public Filter handleURL(ParsedURL url, boolean needRawData) {
Filter ret = handleURL(url);
if(ret != null) {
return ret;
}
// Image not found in registry.
return ImageTagRegistry.getBrokenLinkImage(ThumbnailRegistryEntry.this, ErrorConstants.ERR_IMAGE_DIR_DOES_NOT_EXIST, new Object[0]);
}
/**
* Statically handle the URL access.
*
* @param url URL to access
* @return Image, or null
*/
public static Filter handleURL(ParsedURL url) {
if(logger.isDebuggingFiner()) {
logger.debugFiner("handleURL " + url.toString());
}
if(!isCompatibleURLStatic(url)) {
return null;
}
int id;
try {
id = Integer.parseInt(url.getPath());
}
catch(NumberFormatException e) {
return null;
}
SoftReference<RenderedImage> ref = images.get(id);
if(ref != null) {
RenderedImage ri = ref.get();
if(ri == null) {
logger.warning("Referenced image has expired from the cache!");
}
else {
return new RedRable(GraphicsUtil.wrap(ri));
}
}
// Image not found in registry.
return null;
}
/**
* URL representation for internal URLs.
*
* @author Erich Schubert
*/
class InternalParsedURLData extends ParsedURLData {
/**
* Constructor.
*/
public InternalParsedURLData(String id) {
super();
this.protocol = INTERNAL_PROTOCOL;
this.contentType = INTERNAL_MIME_TYPE;
this.path = id;
}
@Override
public String getContentType(String userAgent) {
return INTERNAL_MIME_TYPE;
}
@Override
public boolean complete() {
return true;
}
@SuppressWarnings("rawtypes")
@Override
public InputStream openStream(String userAgent, Iterator mimeTypes) throws IOException {
// Return null, since we don't want to use streams.
return null;
}
}
@Override
public ParsedURLData parseURL(String urlStr) {
if(logger.isDebuggingFinest()) {
logger.debugFinest("parseURL: " + urlStr);
}
if(urlStr.startsWith(INTERNAL_PREFIX)) {
InternalParsedURLData ret = new InternalParsedURLData(urlStr.substring(INTERNAL_PREFIX.length()));
return ret;
}
return null;
}
@Override
public ParsedURLData parseURL(ParsedURL basepurl, String urlStr) {
// Won't happen in a relative way anyway, and is not particularly
// supported (as the objects might be dropped from the cache)
return parseURL(urlStr);
}
@Override
public String getProtocolHandled() {
return INTERNAL_PROTOCOL;
}
}
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