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build/annotationProcessors/classloader/JarClassIterator.java@97036ab72558 (annotated)

build/annotationProcessors/classloader/JarClassIterator.java

Tue, 06 Jan 2015 21:39:09 +0100

author

Michael Schloh von Bennewitz <michael@schloh.com>

date

Tue, 06 Jan 2015 21:39:09 +0100

branch

TOR_BUG_9701

changeset 8

97036ab72558

permissions

-rw-r--r--

Conditionally force memory storage according to privacy.thirdparty.isolate;
This solves Tor bug #9701, complying with disk avoidance documented in
https://www.torproject.org/projects/torbrowser/design/#disk-avoidance.

michael@0	1	/* This Source Code Form is subject to the terms of the Mozilla Public
michael@0	2	* License, v. 2.0. If a copy of the MPL was not distributed with this
michael@0	3	* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
michael@0	4
michael@0	5	package org.mozilla.gecko.annotationProcessors.classloader;
michael@0	6
michael@0	7	import java.lang.annotation.Annotation;
michael@0	8	import java.lang.reflect.InvocationTargetException;
michael@0	9	import java.lang.reflect.Method;
michael@0	10	import java.util.Iterator;
michael@0	11
michael@0	12	/**
michael@0	13	* Class for iterating over an IterableJarLoadingURLClassLoader's classes.
michael@0	14	*/
michael@0	15	public class JarClassIterator implements Iterator<ClassWithOptions> {
michael@0	16	private IterableJarLoadingURLClassLoader mTarget;
michael@0	17	private Iterator<String> mTargetClassListIterator;
michael@0	18
michael@0	19	public JarClassIterator(IterableJarLoadingURLClassLoader aTarget) {
michael@0	20	mTarget = aTarget;
michael@0	21	mTargetClassListIterator = aTarget.classNames.iterator();
michael@0	22	}
michael@0	23
michael@0	24	@Override
michael@0	25	public boolean hasNext() {
michael@0	26	return mTargetClassListIterator.hasNext();
michael@0	27	}
michael@0	28
michael@0	29	@Override
michael@0	30	public ClassWithOptions next() {
michael@0	31	String className = mTargetClassListIterator.next();
michael@0	32	try {
michael@0	33	Class<?> ret = mTarget.loadClass(className);
michael@0	34	final String canonicalName;
michael@0	35
michael@0	36	// Incremental builds can leave stale classfiles in the jar. Such classfiles will cause
michael@0	37	// an exception at this point. We can safely ignore these classes - they cannot possibly
michael@0	38	// ever be loaded as they conflict with their parent class and will be killed by Proguard
michael@0	39	// later on anyway.
michael@0	40	try {
michael@0	41	canonicalName = ret.getCanonicalName();
michael@0	42	} catch (IncompatibleClassChangeError e) {
michael@0	43	return next();
michael@0	44	}
michael@0	45
michael@0	46	if (canonicalName == null || "null".equals(canonicalName)) {
michael@0	47	// Anonymous inner class - unsupported.
michael@0	48	return next();
michael@0	49	} else {
michael@0	50	String generateName = null;
michael@0	51	for (Annotation annotation : ret.getAnnotations()) {
michael@0	52	Class<?> annotationType = annotation.annotationType();
michael@0	53	if (annotationType.getCanonicalName().equals("org.mozilla.gecko.mozglue.generatorannotations.GeneratorOptions")) {
michael@0	54	try {
michael@0	55	// Determine the explicitly-given name of the stub to generate, if any.
michael@0	56	final Method generateNameMethod = annotationType.getDeclaredMethod("generatedClassName");
michael@0	57	generateNameMethod.setAccessible(true);
michael@0	58	generateName = (String) generateNameMethod.invoke(annotation);
michael@0	59	break;
michael@0	60	} catch (NoSuchMethodException e) {
michael@0	61	System.err.println("Unable to find expected field on GeneratorOptions annotation. Did the signature change?");
michael@0	62	e.printStackTrace(System.err);
michael@0	63	System.exit(3);
michael@0	64	} catch (IllegalAccessException e) {
michael@0	65	System.err.println("IllegalAccessException reading fields on GeneratorOptions annotation. Seems the semantics of Reflection have changed...");
michael@0	66	e.printStackTrace(System.err);
michael@0	67	System.exit(4);
michael@0	68	} catch (InvocationTargetException e) {
michael@0	69	System.err.println("InvocationTargetException reading fields on GeneratorOptions annotation. This really shouldn't happen.");
michael@0	70	e.printStackTrace(System.err);
michael@0	71	System.exit(5);
michael@0	72	}
michael@0	73	}
michael@0	74	}
michael@0	75	if (generateName == null) {
michael@0	76	generateName = ret.getSimpleName();
michael@0	77	}
michael@0	78	return new ClassWithOptions(ret, generateName);
michael@0	79	}
michael@0	80	} catch (ClassNotFoundException e) {
michael@0	81	System.err.println("Unable to enumerate class: " + className + ". Corrupted jar file?");
michael@0	82	e.printStackTrace();
michael@0	83	System.exit(2);
michael@0	84	}
michael@0	85	return null;
michael@0	86	}
michael@0	87
michael@0	88	@Override
michael@0	89	public void remove() {
michael@0	90	throw new UnsupportedOperationException("Removal of classes from iterator not supported.");
michael@0	91	}
michael@0	92	}