import com.google.common.base.Joiner;
import com.google.common.base.Preconditions;
+import com.google.common.base.Splitter;
import com.google.common.base.Supplier;
import java.lang.reflect.Constructor;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.ParameterizedType;
import java.lang.reflect.Type;
-import java.util.Arrays;
import java.util.List;
import java.util.concurrent.Callable;
import org.slf4j.Logger;
public final class ClassLoaderUtils {
private static final Logger LOG = LoggerFactory.getLogger(ClassLoaderUtils.class);
+ private static final Splitter DOT_SPLITTER = Splitter.on('.');
private ClassLoaderUtils() {
throw new UnsupportedOperationException("Utility class");
}
/**
- *
* Runs {@link Supplier} with provided {@link ClassLoader}.
*
- * Invokes supplies function and makes sure that original {@link ClassLoader}
+ * <p>Invokes supplies function and makes sure that original {@link ClassLoader}
* is context {@link ClassLoader} after execution.
*
* @param cls {@link ClassLoader} to be used.
* @param function Function to be executed.
* @return Result of supplier invocation.
- *
*/
public static <V> V withClassLoader(final ClassLoader cls, final Supplier<V> function) {
checkNotNull(cls, "Classloader should not be null");
checkNotNull(function, "Function should not be null");
- final ClassLoader oldCls = Thread.currentThread().getContextClassLoader();
+ final Thread currentThread = Thread.currentThread();
+ final ClassLoader oldCls = currentThread.getContextClassLoader();
try {
- Thread.currentThread().setContextClassLoader(cls);
+ currentThread.setContextClassLoader(cls);
return function.get();
} finally {
- Thread.currentThread().setContextClassLoader(oldCls);
+ currentThread.setContextClassLoader(oldCls);
}
}
/**
- *
* Runs {@link Callable} with provided {@link ClassLoader}.
*
* Invokes supplies function and makes sure that original {@link ClassLoader}
* @param cls {@link ClassLoader} to be used.
* @param function Function to be executed.
* @return Result of callable invocation.
- *
*/
public static <V> V withClassLoader(final ClassLoader cls, final Callable<V> function) throws Exception {
checkNotNull(cls, "Classloader should not be null");
checkNotNull(function, "Function should not be null");
- final ClassLoader oldCls = Thread.currentThread().getContextClassLoader();
+ final Thread currentThread = Thread.currentThread();
+ final ClassLoader oldCls = currentThread.getContextClassLoader();
try {
- Thread.currentThread().setContextClassLoader(cls);
+ currentThread.setContextClassLoader(cls);
return function.call();
} finally {
- Thread.currentThread().setContextClassLoader(oldCls);
+ currentThread.setContextClassLoader(oldCls);
}
}
- public static Object construct(final Constructor<? extends Object> constructor, final List<Object> objects)
+ public static Object construct(final Constructor<?> constructor, final List<Object> objects)
throws InstantiationException, IllegalAccessException, IllegalArgumentException, InvocationTargetException {
final Object[] initargs = objects.toArray();
return constructor.newInstance(initargs);
}
/**
- *
* Loads class using this supplied classloader.
*
- *
- * @param cls
* @param name String name of class.
- * @return
- * @throws ClassNotFoundException
*/
public static Class<?> loadClass(final ClassLoader cls, final String name) throws ClassNotFoundException {
if ("byte[]".equals(name)) {
try {
return cls.loadClass(name);
} catch (final ClassNotFoundException e) {
- final String[] components = name.split("\\.");
+ final List<String> components = DOT_SPLITTER.splitToList(name);
if (isInnerClass(components)) {
- final int length = components.length;
- final String outerName = Joiner.on(".").join(Arrays.asList(components).subList(0, length - 1));
- final String innerName = outerName + "$" + components[length-1];
+ final int length = components.size() - 1;
+ final String outerName = Joiner.on(".").join(components.subList(0, length));
+ final String innerName = outerName + "$" + components.get(length);
return cls.loadClass(innerName);
- } else {
- throw e;
}
+
+ throw e;
}
}
- private static boolean isInnerClass(final String[] components) {
- final int length = components.length;
- if(length < 2) {
+ private static boolean isInnerClass(final List<String> components) {
+ final int length = components.size();
+ if (length < 2) {
return false;
}
- final String potentialOuter = components[length - 2];
- if(potentialOuter == null) {
+
+ final String potentialOuter = components.get(length - 2);
+ if (potentialOuter == null) {
return false;
}
return Character.isUpperCase(potentialOuter.charAt(0));
}
public static Class<?> loadClassWithTCCL(final String name) throws ClassNotFoundException {
- return loadClass(Thread.currentThread().getContextClassLoader(), name);
+ final Thread thread = Thread.currentThread();
+ final ClassLoader tccl = thread.getContextClassLoader();
+ if (tccl == null) {
+ throw new ClassNotFoundException("Thread " + thread + " does not have a Context Class Loader, cannot load "
+ + name);
+ }
+ return loadClass(tccl, name);
}
- public static Class<?> tryToLoadClassWithTCCL(final String fullyQualifiedName) {
+ public static Class<?> tryToLoadClassWithTCCL(final String fullyQualifiedClassName) {
+ final Thread thread = Thread.currentThread();
+ final ClassLoader tccl = thread.getContextClassLoader();
+ if (tccl == null) {
+ LOG.debug("Thread {} does not have a Context Class Loader, not loading class {}", thread,
+ fullyQualifiedClassName);
+ return null;
+ }
+
try {
- return loadClassWithTCCL(fullyQualifiedName);
+ return loadClass(tccl, fullyQualifiedClassName);
} catch (final ClassNotFoundException e) {
- LOG.debug("Failed to load class {}", fullyQualifiedName, e);
+ LOG.debug("Failed to load class {}", fullyQualifiedClassName, e);
return null;
}
}
public static <S,G,P> Class<P> findFirstGenericArgument(final Class<S> scannedClass, final Class<G> genericType) {
- return withClassLoader(scannedClass.getClassLoader(), ClassLoaderUtils.<S,G,P>findFirstGenericArgumentTask(scannedClass, genericType));
+ return withClassLoader(scannedClass.getClassLoader(), findFirstGenericArgumentTask(scannedClass, genericType));
}
- private static <S,G,P> Supplier<Class<P>> findFirstGenericArgumentTask(final Class<S> scannedClass, final Class<G> genericType) {
- return new Supplier<Class<P>>() {
- @Override
- @SuppressWarnings("unchecked")
- public Class<P> get() {
- final ParameterizedType augmentationGeneric = findParameterizedType(scannedClass, genericType);
- if (augmentationGeneric != null) {
- return (Class<P>) augmentationGeneric.getActualTypeArguments()[0];
- }
- return null;
+ @SuppressWarnings("unchecked")
+ private static <S, G, P> Supplier<Class<P>> findFirstGenericArgumentTask(final Class<S> scannedClass,
+ final Class<G> genericType) {
+ return () -> {
+ final ParameterizedType augmentationGeneric = findParameterizedType(scannedClass, genericType);
+ if (augmentationGeneric != null) {
+ return (Class<P>) augmentationGeneric.getActualTypeArguments()[0];
}
+ return null;
};
}
Code Review / yangtools.git / blobdiff