com.twelvemonkeys.imageio.stream.URLImageInputStreamSpi Maven / Gradle / Ivy
package com.twelvemonkeys.imageio.stream;
import javax.imageio.spi.ImageInputStreamSpi;
import javax.imageio.stream.FileCacheImageInputStream;
import javax.imageio.stream.FileImageInputStream;
import javax.imageio.stream.ImageInputStream;
import javax.imageio.stream.MemoryCacheImageInputStream;
import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.net.URISyntaxException;
import java.net.URL;
import java.util.Locale;
/**
* URLImageInputStreamSpi
* Experimental
*
* @author Harald Kuhr
* @author last modified by $Author: haraldk$
* @version $Id: URLImageInputStreamSpi.java,v 1.0 May 15, 2008 2:14:59 PM haraldk Exp$
*/
// TODO: URI instead of URL?
public class URLImageInputStreamSpi extends ImageInputStreamSpi {
public URLImageInputStreamSpi() {
super("TwelveMonkeys", "1.0 BETA", URL.class);
}
// TODO: Create a URI or URLImageInputStream class, with a getUR[I|L] method, to allow for multiple file formats
// The good thing with that is that it does not clash with the built-in Sun-stuff or other people's hacks
// The bad thing is that most people don't expect there to be an UR[I|L]ImageInputStreamSpi..
public ImageInputStream createInputStreamInstance(final Object pInput, final boolean pUseCache, final File pCacheDir) throws IOException {
if (pInput instanceof URL) {
URL url = (URL) pInput;
// Special case for file protocol, a lot faster than FileCacheImageInputStream
if ("file".equals(url.getProtocol())) {
try {
return new BufferedImageInputStream(new FileImageInputStream(new File(url.toURI())));
}
catch (URISyntaxException ignore) {
// This should never happen, but if it does, we'll fall back to using the stream
ignore.printStackTrace();
}
}
// Otherwise revert to cached
final InputStream stream = url.openStream();
if (pUseCache) {
return new BufferedImageInputStream(new FileCacheImageInputStream(stream, pCacheDir) {
@Override
public void close() throws IOException {
try {
super.close();
}
finally {
stream.close(); // NOTE: If this line throws IOE, it will shadow the original..
}
}
});
}
else {
return new MemoryCacheImageInputStream(stream) {
@Override
public void close() throws IOException {
try {
super.close();
}
finally {
stream.close(); // NOTE: If this line throws IOE, it will shadow the original..
}
}
};
}
}
else {
throw new IllegalArgumentException("Expected input of type URL: " + pInput);
}
}
public String getDescription(final Locale pLocale) {
return "Service provider that instantiates an ImageInputStream from a URL";
}
}
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