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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.lang.annotation.Annotation;
import java.lang.reflect.Method;
import java.util.Iterator;
/**
* Class for iterating over an IterableJarLoadingURLClassLoader's classes.
*
* <p>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();
}
String ifdef = "";
for (final Annotation annotation : ret.getDeclaredAnnotations()) {
Class<? extends Annotation> annotationType = annotation.annotationType();
if (!annotationType.getName().equals("org.mozilla.gecko.annotation.BuildFlag")) {
continue;
}
try {
final Method valueMethod = annotationType.getDeclaredMethod("value");
valueMethod.setAccessible(true);
ifdef = (String) valueMethod.invoke(annotation);
break;
} catch (final Exception e) {
System.err.println("Unable to read BuildFlag annotation.");
e.printStackTrace(System.err);
System.exit(1);
}
}
lookAhead = new ClassWithOptions(ret, ret.getSimpleName(), ifdef);
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.");
}
}
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