mockit.internal.ClassLoadingBridge Maven / Gradle / Ivy
/*
* Copyright (c) 2006 JMockit developers
* This file is subject to the terms of the MIT license (see LICENSE.txt).
*/
package mockit.internal;
import java.io.*;
import java.lang.reflect.*;
import java.net.*;
import java.util.*;
import java.util.concurrent.locks.*;
import java.util.jar.*;
import javax.annotation.*;
import mockit.internal.expectations.mocking.*;
import mockit.internal.faking.*;
import mockit.internal.util.*;
public abstract class ClassLoadingBridge implements InvocationHandler
{
private static final Object[] EMPTY_ARGS = {};
private static final ReentrantLock LOCK = new ReentrantLock();
private static boolean fieldsSet;
public static String hostJREClassName;
public final String id;
/**
* The instance is stored in a place directly accessible through the Java SE API, so that it can be recovered from
* any class loader.
*/
protected ClassLoadingBridge(@Nonnull String id) { this.id = id; }
protected static boolean notToBeMocked(@Nullable Object instance, @Nonnull String classDesc) {
return
(instance == null && "java/lang/System".equals(classDesc) ||
instance != null && instanceOfClassThatParticipatesInClassLoading(instance.getClass())
) && wasCalledDuringClassLoading();
}
public static boolean instanceOfClassThatParticipatesInClassLoading(@Nonnull Class aClass) {
return
aClass == File.class || aClass == URL.class || aClass == FileInputStream.class || aClass == Manifest.class ||
JarFile.class.isAssignableFrom(aClass) || JarEntry.class.isAssignableFrom(aClass) ||
Vector.class.isAssignableFrom(aClass) || Hashtable.class.isAssignableFrom(aClass);
}
private static boolean wasCalledDuringClassLoading() {
if (LOCK.isHeldByCurrentThread()) {
return true;
}
LOCK.lock();
try {
StackTrace st = new StackTrace(new Throwable());
int n = st.getDepth();
for (int i = 3; i < n; i++) {
StackTraceElement ste = st.getElement(i);
if (
"ClassLoader.java".equals(ste.getFileName()) &&
"loadClass getResource loadLibrary".contains(ste.getMethodName())
) {
return true;
}
}
return false;
}
finally {
LOCK.unlock();
}
}
@Nonnull
protected static Object[] extractArguments(@Nonnegative int startingIndex, @Nonnull Object[] args) {
if (args.length > startingIndex) {
Object[] targetMemberArgs = new Object[args.length - startingIndex];
System.arraycopy(args, startingIndex, targetMemberArgs, 0, targetMemberArgs.length);
return targetMemberArgs;
}
return EMPTY_ARGS;
}
@Nonnull
static String getHostClassName() {
if (!fieldsSet) {
setBridgeFields();
fieldsSet = true;
}
return hostJREClassName;
}
private static void setBridgeFields() {
Class hostClass = ClassLoad.loadByInternalName(hostJREClassName);
setBridgeField(hostClass, MockedBridge.MB);
setBridgeField(hostClass, FakeBridge.MB);
setBridgeField(hostClass, FakeMethodBridge.MB);
}
private static void setBridgeField(@Nonnull Class hostClass, @Nonnull ClassLoadingBridge bridge) {
try {
hostClass.getDeclaredField(bridge.id).set(null, bridge);
}
catch (NoSuchFieldException ignore) {}
catch (IllegalAccessException e) { throw new RuntimeException(e); }
}
}