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#64036 - Replace reflection calls in factories for Java 9+ 

ImageRenderer implementation are now loaded via ServiceLoader
fixed the ServiceLoader.load invocations to pass a sensible ClassLoader as OSGi preparation

git-svn-id: https://svn.apache.org/repos/asf/poi/trunk@1880911 13f79535-47bb-0310-9956-ffa450edef68
This commit is contained in:
Andreas Beeker 2020-08-16 23:19:51 +00:00
parent afe4a109a8
commit 506089a9f1
1 changed files with 19 additions and 30 deletions
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49
src/java/org/apache/poi/sl/draw/DrawPictureShape.java
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@ -23,7 +23,9 @@ import java.awt.Insets;
import java.awt.Paint;
import java.awt.geom.Rectangle2D;
import java.io.IOException;
import java.lang.reflect.InvocationTargetException;
import java.util.ServiceLoader;
import java.util.function.Supplier;
import java.util.stream.StreamSupport;
import org.apache.poi.sl.usermodel.PictureData;
import org.apache.poi.sl.usermodel.PictureShape;
@ -77,44 +79,31 @@ public class DrawPictureShape extends DrawSimpleShape {
* @param graphics the graphics context
* @return the image renderer
*/
@SuppressWarnings({"unchecked"})
public static ImageRenderer getImageRenderer(Graphics2D graphics, String contentType) {
final ImageRenderer renderer = (graphics != null) ? (ImageRenderer)graphics.getRenderingHint(Drawable.IMAGE_RENDERER) : null;
if (renderer != null && renderer.canRender(contentType)) {
return renderer;
}
// first try with our default image renderer
final BitmapImageRenderer bir = new BitmapImageRenderer();
if (bir.canRender(contentType)) {
return bir;
final BitmapImageRenderer fallback = new BitmapImageRenderer();
if (fallback.canRender(contentType)) {
return fallback;
}
// then iterate through the scratchpad renderers
//
// this could be nicely implemented via a j.u.ServiceLoader, but OSGi makes things complicated ...
// https://blog.osgi.org/2013/02/javautilserviceloader-in-osgi.html
// ... therefore falling back to classloading attempts
ClassLoader cl = ImageRenderer.class.getClassLoader();
for (String kr : KNOWN_RENDERER) {
final ImageRenderer ir;
try {
ir = ((Class<? extends ImageRenderer>)cl.loadClass(kr)).getConstructor().newInstance();
} catch (ClassNotFoundException | InstantiationException | IllegalAccessException | NoSuchMethodException | InvocationTargetException e) {
// scratchpad was not on the path, ignore and continue
LOG.log(POILogger.INFO, "Known image renderer '"+kr+" not found/loaded - include poi-scratchpad jar!", e);
continue;
}
if (ir.canRender(contentType)) {
return ir;
}
}
// the fallback is the BitmapImageRenderer, at least it gracefully handles invalid images
final Supplier<ImageRenderer> getFallback = () -> {
LOG.log(POILogger.WARN, "No suiteable image renderer found for content-type '"+
contentType+"' - include poi-scratchpad (for wmf/emf) or poi-ooxml (for svg) jars!");
return fallback;
};
LOG.log(POILogger.WARN, "No suiteable image renderer found for content-type '"+
contentType+"' - include poi-scratchpad jar!");
// falling back to BitmapImageRenderer, at least it gracefully handles invalid images
return bir;
ClassLoader cl = DrawPictureShape.class.getClassLoader();
return StreamSupport
.stream(ServiceLoader.load(ImageRenderer.class, cl).spliterator(), false)
.filter(ir -> ir.canRender(contentType))
.findFirst()
.orElseGet(getFallback)
;
}
@Override