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com.openhtmltopdf.swing.ImageResourceLoader Maven / Gradle / Ivy
package com.openhtmltopdf.swing;
import java.awt.image.BufferedImage;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;
import java.util.Iterator;
import java.util.LinkedHashMap;
import java.util.Map;
import java.util.logging.Level;
import javax.imageio.ImageIO;
import com.openhtmltopdf.extend.FSImage;
import com.openhtmltopdf.resource.ImageResource;
import com.openhtmltopdf.util.Configuration;
import com.openhtmltopdf.util.ImageUtil;
import com.openhtmltopdf.util.StreamResource;
import com.openhtmltopdf.util.XRLog;
/**
*
*/
public class ImageResourceLoader {
public static final RepaintListener NO_OP_REPAINT_LISTENER = new RepaintListener() {
public void repaintRequested(boolean doLayout) {
XRLog.general(Level.FINE, "No-op repaint requested");
}
};
private final Map _imageCache;
private final ImageLoadQueue _loadQueue;
private final int _imageCacheCapacity;
private RepaintListener _repaintListener = NO_OP_REPAINT_LISTENER;
private final boolean _useBackgroundImageLoading;
public ImageResourceLoader() {
// FIXME
this(16);
}
public ImageResourceLoader(int cacheSize) {
this._imageCacheCapacity = cacheSize;
this._useBackgroundImageLoading = Configuration.isTrue("xr.image.background.loading.enable", false);
if (_useBackgroundImageLoading) {
this._loadQueue = new ImageLoadQueue();
final int workerCount = Configuration.valueAsInt("xr.image.background.workers", 5);
for (int i = 0; i < workerCount; i++) {
new ImageLoadWorker(_loadQueue).start();
}
} else {
this._loadQueue = null;
}
this._repaintListener = NO_OP_REPAINT_LISTENER;
// note we do *not* override removeEldestEntry() here--users of this class must call shrinkImageCache().
// that's because we don't know when is a good time to flush the cache
this._imageCache = new LinkedHashMap(cacheSize, 0.75f, true);
}
public static ImageResource loadImageResourceFromUri(final String uri) {
if (ImageUtil.isEmbeddedBase64Image(uri)) {
return loadEmbeddedBase64ImageResource(uri);
} else {
StreamResource sr = new StreamResource(uri);
InputStream is;
ImageResource ir = null;
try {
sr.connect();
is = sr.bufferedStream();
try {
BufferedImage img = ImageIO.read(is);
if (img == null) {
throw new IOException("ImageIO.read() returned null");
}
ir = createImageResource(uri, img);
} catch (FileNotFoundException e) {
XRLog.exception("Can't read image file; image at URI '" + uri + "' not found");
} catch (IOException e) {
XRLog.exception("Can't read image file; unexpected problem for URI '" + uri + "'", e);
} finally {
sr.close();
}
} catch (IOException e) {
// couldnt open stream at URI...
XRLog.exception("Can't open stream for URI '" + uri + "': " + e.getMessage());
}
if (ir == null) {
ir = createImageResource(uri, null);
}
return ir;
}
}
public static ImageResource loadEmbeddedBase64ImageResource(final String uri) {
BufferedImage bufferedImage = ImageUtil.loadEmbeddedBase64Image(uri);
if (bufferedImage != null) {
FSImage image = AWTFSImage.createImage(bufferedImage);
return new ImageResource(null, image);
} else {
return new ImageResource(null, null);
}
}
public synchronized void shrink() {
int ovr = _imageCache.size() - _imageCacheCapacity;
Iterator it = _imageCache.keySet().iterator();
while (it.hasNext() && ovr-- > 0) {
it.next();
it.remove();
}
}
public synchronized void clear() {
_imageCache.clear();
}
public ImageResource get(final String uri) {
return get(uri, -1, -1);
}
public synchronized ImageResource get(final String uri, final int width, final int height) {
if (ImageUtil.isEmbeddedBase64Image(uri)) {
ImageResource resource = loadEmbeddedBase64ImageResource(uri);
resource.getImage().scale(width, height);
return resource;
} else {
CacheKey key = new CacheKey(uri, width, height);
ImageResource ir = (ImageResource) _imageCache.get(key);
if (ir == null) {
// not loaded, or not loaded at target size
// loaded a base size?
ir = (ImageResource) _imageCache.get(new CacheKey(uri, -1, -1));
// no: loaded
if (ir == null) {
if (isImmediateLoadUri(uri)) {
XRLog.load(Level.FINE, "Load immediate: " + uri);
ir = loadImageResourceFromUri(uri);
FSImage awtfsImage = ir.getImage();
BufferedImage newImg = ((AWTFSImage) awtfsImage).getImage();
loaded(ir, -1, -1);
if (width > -1 && height > -1) {
XRLog.load(Level.FINE, this + ", scaling " + uri + " to " + width + ", " + height);
newImg = ImageUtil.getScaledInstance(newImg, width, height);
ir = new ImageResource(ir.getImageUri(), AWTFSImage.createImage(newImg));
loaded(ir, width, height);
}
} else {
XRLog.load(Level.FINE, "Image cache miss, URI not yet loaded, queueing: " + uri);
MutableFSImage mfsi = new MutableFSImage(_repaintListener);
ir = new ImageResource(uri, mfsi);
_loadQueue.addToQueue(this, uri, mfsi, width, height);
}
_imageCache.put(key, ir);
} else {
// loaded at base size, need to scale
XRLog.load(Level.FINE, this + ", scaling " + uri + " to " + width + ", " + height);
FSImage awtfsImage = ir.getImage();
BufferedImage newImg = ((AWTFSImage) awtfsImage).getImage();
newImg = ImageUtil.getScaledInstance(newImg, width, height);
ir = new ImageResource(ir.getImageUri(), AWTFSImage.createImage(newImg));
loaded(ir, width, height);
}
}
return ir;
}
}
public boolean isImmediateLoadUri(final String uri) {
return ! _useBackgroundImageLoading || uri.startsWith("jar:file:") || uri.startsWith("file:");
}
public synchronized void loaded(final ImageResource ir, final int width, final int height) {
String imageUri = ir.getImageUri();
if (imageUri != null) {
_imageCache.put(new CacheKey(imageUri, width, height), ir);
}
}
public static ImageResource createImageResource(final String uri, final BufferedImage img) {
if (img == null) {
return new ImageResource(uri, AWTFSImage.createImage(ImageUtil.createTransparentImage(10, 10)));
} else {
return new ImageResource(uri, AWTFSImage.createImage(ImageUtil.makeCompatible(img)));
}
}
public void setRepaintListener(final RepaintListener repaintListener) {
_repaintListener = repaintListener;
}
public void stopLoading() {
if (_loadQueue != null) {
XRLog.load("By request, clearing pending items from load queue: " + _loadQueue.size());
_loadQueue.reset();
}
}
private static class CacheKey {
final String uri;
final int width;
final int height;
public CacheKey(final String uri, final int width, final int height) {
this.uri = uri;
this.width = width;
this.height = height;
}
public boolean equals(final Object o) {
if (this == o) return true;
if (!(o instanceof CacheKey)) return false;
final CacheKey cacheKey = (CacheKey) o;
if (height != cacheKey.height) return false;
if (width != cacheKey.width) return false;
if (!uri.equals(cacheKey.uri)) return false;
return true;
}
public int hashCode() {
int result = uri.hashCode();
result = 31 * result + width;
result = 31 * result + height;
return result;
}
}
}
// from-io-loader
// from-cache-loader
// from-fs-loader
