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authorMatt A. Tobin <mattatobin@localhost.localdomain>2018-02-02 04:16:08 -0500
committerMatt A. Tobin <mattatobin@localhost.localdomain>2018-02-02 04:16:08 -0500
commit5f8de423f190bbb79a62f804151bc24824fa32d8 (patch)
tree10027f336435511475e392454359edea8e25895d /build/annotationProcessors/classloader/JarClassIterator.java
parent49ee0794b5d912db1f95dce6eb52d781dc210db5 (diff)
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Add m-esr52 at 52.6.0
Diffstat (limited to 'build/annotationProcessors/classloader/JarClassIterator.java')
-rw-r--r--build/annotationProcessors/classloader/JarClassIterator.java84
1 files changed, 84 insertions, 0 deletions
diff --git a/build/annotationProcessors/classloader/JarClassIterator.java b/build/annotationProcessors/classloader/JarClassIterator.java
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+++ b/build/annotationProcessors/classloader/JarClassIterator.java
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+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+package org.mozilla.gecko.annotationProcessors.classloader;
+
+import java.util.Iterator;
+
+/**
+ * Class for iterating over an IterableJarLoadingURLClassLoader's classes.
+ *
+ * This class is not thread safe: use it only from a single thread.
+ */
+public class JarClassIterator implements Iterator<ClassWithOptions> {
+ private IterableJarLoadingURLClassLoader mTarget;
+ private Iterator<String> mTargetClassListIterator;
+
+ private ClassWithOptions lookAhead;
+
+ public JarClassIterator(IterableJarLoadingURLClassLoader aTarget) {
+ mTarget = aTarget;
+ mTargetClassListIterator = aTarget.classNames.iterator();
+ }
+
+ @Override
+ public boolean hasNext() {
+ return fillLookAheadIfPossible();
+ }
+
+ @Override
+ public ClassWithOptions next() {
+ if (!fillLookAheadIfPossible()) {
+ throw new IllegalStateException("Failed to look ahead in next()!");
+ }
+ ClassWithOptions next = lookAhead;
+ lookAhead = null;
+ return next;
+ }
+
+ private boolean fillLookAheadIfPossible() {
+ if (lookAhead != null) {
+ return true;
+ }
+
+ if (!mTargetClassListIterator.hasNext()) {
+ return false;
+ }
+
+ String className = mTargetClassListIterator.next();
+ try {
+ Class<?> ret = mTarget.loadClass(className);
+
+ // Incremental builds can leave stale classfiles in the jar. Such classfiles will cause
+ // an exception at this point. We can safely ignore these classes - they cannot possibly
+ // ever be loaded as they conflict with their parent class and will be killed by
+ // Proguard later on anyway.
+ final Class<?> enclosingClass;
+ try {
+ enclosingClass = ret.getEnclosingClass();
+ } catch (IncompatibleClassChangeError e) {
+ return fillLookAheadIfPossible();
+ }
+
+ if (enclosingClass != null) {
+ // Anonymous inner class - unsupported.
+ // Or named inner class, which will be processed when we process the outer class.
+ return fillLookAheadIfPossible();
+ }
+
+ lookAhead = new ClassWithOptions(ret, ret.getSimpleName());
+ return true;
+ } catch (ClassNotFoundException e) {
+ System.err.println("Unable to enumerate class: " + className + ". Corrupted jar file?");
+ e.printStackTrace();
+ System.exit(2);
+ }
+ return false;
+ }
+
+ @Override
+ public void remove() {
+ throw new UnsupportedOperationException("Removal of classes from iterator not supported.");
+ }
+}