com.sun.hk2.component.AbstractInhabitantImpl Maven / Gradle / Ivy
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package com.sun.hk2.component;
import org.jvnet.hk2.tracing.TracingThreadLocal;
import org.jvnet.hk2.tracing.TracingUtilities;
import org.jvnet.hk2.component.Habitat;
import org.jvnet.hk2.component.Inhabitant;
import sun.misc.BASE64Decoder;
import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectStreamClass;
import java.lang.annotation.Annotation;
import java.util.Collection;
import java.util.Collections;
/**
* Partial implementation of {@link Inhabitant} that defines methods whose
* semantics is fixed by {@link Habitat}.
*
* @author Kohsuke Kawaguchi
*/
@SuppressWarnings("unchecked")
public abstract class AbstractInhabitantImpl implements Inhabitant {
private Collection companions;
@Override
public String toString() {
return getClass().getSimpleName() + "-" + System.identityHashCode(this) +
"(" + typeName() + ")";
}
public final T get() {
try {
if (TracingUtilities.isEnabled())
TracingThreadLocal.get().push(this);
return get(this);
} finally {
if (TracingUtilities.isEnabled())
TracingThreadLocal.get().pop();
}
}
public T getSerializedMetadata(final Class type, String key) {
String v = metadata().getOne(key);
if(v==null) return null;
try {
ObjectInputStream is = new ObjectInputStream(new ByteArrayInputStream(new BASE64Decoder().decodeBuffer(v))) {
final ClassLoader cl = type.getClassLoader();
/**
* Use ClassLoader of the given type. Otherwise by default we end up using the classloader
* that loaded HK2, which won't be able to see most of the user classes.
*/
protected Class resolveClass(ObjectStreamClass desc) throws IOException, ClassNotFoundException {
String name = desc.getName();
try {
return Class.forName(name,false,cl);
} catch (ClassNotFoundException ex) {
return super.resolveClass(desc);
}
}
};
return type.cast(is.readObject());
} catch (ClassNotFoundException e) {
throw new Error(e);
} catch (IOException e) {
throw new Error(e);
}
}
public final T getSerializedMetadata(Class type) {
return getSerializedMetadata(type,type.getName());
}
public Inhabitant lead() {
return null;
}
public final Collection companions() {
if(companions==null) return Collections.emptyList();
else return companions;
}
public final void setCompanions(Collection companions) {
this.companions = companions;
}
public V getAnnotation(Class annotation) {
return getAnnotation(type(), annotation, false);
}
/**
* FOR INTERNAL USE TO HK2
*/
public static V getAnnotation(Class annotated,
Class annotation,
boolean walkParentChain) {
V v = annotated.getAnnotation(annotation);
if (null != v) {
return v;
}
for (Annotation a : annotated.getAnnotations()) {
v = a.annotationType().getAnnotation(annotation);
if (null != v) {
return v;
}
}
if (walkParentChain) {
annotated = annotated.getSuperclass();
if (null != annotated) {
return getAnnotation(annotated, annotation, true);
}
}
return null;
}
}