net.imagej.patcher.EssentialLegacyHooks Maven / Gradle / Ivy
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* ImageJ software for multidimensional image processing and analysis.
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* Wisconsin-Madison, Broad Institute of MIT and Harvard, and Max Planck
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package net.imagej.patcher;
import ij.IJ;
import java.io.File;
import java.lang.reflect.Constructor;
import java.net.URL;
import java.net.URLClassLoader;
import java.util.HashSet;
import java.util.Set;
/**
* The base {@link LegacyHooks} to be used in the patched ImageJ 1.x.
*
* This is the minimal implementation of {@link LegacyHooks} and will be
* installed by default after patching in the extension points into ImageJ 1.x.
* On its own, it does not allow to override the extension points (such as the
* editor) with different implementations; one needs to install different hooks
* using the
* {@link net.imagej.patcher.LegacyInjector#installHooks(ClassLoader, LegacyHooks)}
* method.
*
*
* This class is also the perfect base class for all implementations of the
* {@link LegacyHooks} interface, e.g. to offer "real" extension mechanisms such
* as the SciJava-common plugin framework.
*
*
* @author Johannes Schindelin
*/
public class EssentialLegacyHooks extends LegacyHooks {
/** @inherit */
@Override
public void error(Throwable t) {
IJ.handleException(t);
}
/** @inherit */
@Override
public void initialized() {
runInitializer();
}
private void runInitializer() {
final String property = System.getProperty("ij1.patcher.initializer");
try {
final ClassLoader loader = IJ.getClassLoader();
Thread.currentThread().setContextClassLoader(loader);
Class runClass;
if (property != null) {
runClass = loader.loadClass(property);
}
else {
try {
runClass = loader.loadClass("net.imagej.legacy.plugin.LegacyInitializer");
} catch (ClassNotFoundException e) {
runClass = loader.loadClass("imagej.legacy.plugin.LegacyInitializer");
}
}
final Runnable run = (Runnable)runClass.newInstance();
run.run();
} catch (ClassNotFoundException e) {
// ignore
} catch (Throwable t) {
t.printStackTrace();
}
}
/**
* Intended for sole use with patches in {@link ij.IJ}. DO NOT USE.
*/
public static ClassLoader missingSubdirs(final ClassLoader loader, final boolean addPluginsDir) {
if (loader == null || !(loader instanceof URLClassLoader)) return null;
final URLClassLoader classLoader = (URLClassLoader) loader;
final Set directories = new HashSet();
for (final URL url : classLoader.getURLs()) {
if (!"file".equals(url.getProtocol())) continue;
final File dir = new File(url.getPath());
if (!dir.isDirectory()) continue;
directories.add(dir);
}
final Set missing = new HashSet();
if (addPluginsDir) {
String pluginsDir = IJ.getDirectory("plugins");
if (pluginsDir == null) {
pluginsDir = System.getProperty("plugins.dir");
}
if (pluginsDir != null) {
final File plugins = new File(pluginsDir);
if (!directories.contains(plugins)) {
directories.add(plugins);
missing.add(plugins);
}
}
}
try {
for (final File dir : new HashSet(directories)) {
missingSubdirectories(dir, directories, missing);
}
if (missing.isEmpty()) return null;
final URL[] urls = new URL[missing.size()];
int i = 0;
for (final File dir : missing) {
urls[i++] = dir.toURI().toURL();
}
return new URLClassLoader(urls, loader);
}
catch (Exception e) {
e.printStackTrace();
return null;
}
}
private static boolean missingSubdirectories(final File dir, final Set already, final Set missing) {
boolean containsClassFiles = false;
for (final File sub : dir.listFiles()) {
if (sub.isDirectory()) {
if (already.contains(sub) || missing.contains(sub)) continue;
if (missingSubdirectories(sub, already, missing)) try {
containsClassFiles = true;
missing.add(sub);
}
catch (Exception e) {
if (e instanceof RuntimeException) throw (RuntimeException) e;
throw new RuntimeException(e);
}
}
else if (sub.getName().endsWith(".class")) {
containsClassFiles = true;
}
}
return containsClassFiles;
}
/**
* Intercepts LegacyInitializer's Context creation.
*
* One of the most critical code paths in Fiji
* is how its runtime patches get installed. It calls the
* {@link LegacyEnvironment}, of course, but the idea is for said environment
* to install the essential {@link LegacyHooks} which then give ImageJ's
* {@code LegacyService} a chance to spin up all of the legacy patches,
* including Fiji's (which are add-ons on top of {@code imagej-legacy}).
*
*
* If this critical code path fails, Fiji fails to start up properly. Ideally,
* this should never happen, but this is not an ideal world: corrupt
* {@code .jar} files and version skews caused by forgotten updates,
* locally-modified files or simply by forward-incompatible downstream updates
* can break any number of things in that path. So let's bend over another
* inch (the existence of the {@code ij1-patcher} speaks volumes about our
* learned ability to do so) and try extra hard to keep things working even
* under very unfavorable circumstances.
*
*
* @param className the class name
* @param arg the argument passed to the {@code runPlugIn} method
* @return the object to return, or null to let ImageJ 1.x handle the call
*/
@Override
public Object interceptRunPlugIn(final String className, final String arg) {
if ("org.scijava.Context".equals(className)) {
try {
final Class contextClass = IJ.getClassLoader().loadClass(className);
try {
return contextClass.newInstance();
}
catch (Throwable t) {
// "Something" failed... Darn.
t.printStackTrace();
// Try again, with the bare minimum of services: LegacyService and friends
Class legacyServiceClass;
try {
// NB: Old concrete LegacyService class, which no longer exists.
legacyServiceClass = IJ.getClassLoader().loadClass(
"net.imagej.legacy.DefaultLegacyService");
}
catch (Throwable t2) {
try {
// NB: Current concrete LegacyService class.
legacyServiceClass = IJ.getClassLoader().loadClass(
"net.imagej.legacy.LegacyService");
}
catch (Throwable t3) {
// NB: _Really_ old concrete LegacyService class, long gone.
legacyServiceClass = IJ.getClassLoader().loadClass(
"imagej.legacy.DefaultLegacyService");
}
}
Constructor ctor = contextClass.getConstructor((Class) Class[].class);
return ctor.newInstance((Object) new Class[] { legacyServiceClass });
}
}
catch (Throwable t) {
t.printStackTrace();
System.err.println("Giving up to create a SciJava Context!");
}
}
return null;
}
}