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/*
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
*
* Copyright (c) 2013 Oracle and/or its affiliates. All rights reserved.
*
* The contents of this file are subject to the terms of either the GNU
* General Public License Version 2 only ("GPL") or the Common Development
* and Distribution License("CDDL") (collectively, the "License"). You
* may not use this file except in compliance with the License. You can
* obtain a copy of the License at
* https://glassfish.dev.java.net/public/CDDL+GPL_1_1.html
* or packager/legal/LICENSE.txt. See the License for the specific
* language governing permissions and limitations under the License.
*
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* file and include the License file at packager/legal/LICENSE.txt.
*
* GPL Classpath Exception:
* Oracle designates this particular file as subject to the "Classpath"
* exception as provided by Oracle in the GPL Version 2 section of the License
* file that accompanied this code.
*
* Modifications:
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package org.jvnet.hk2.internal;
import java.lang.reflect.AccessibleObject;
import java.lang.reflect.Method;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.RandomAccess;
import org.aopalliance.intercept.MethodInterceptor;
import org.aopalliance.intercept.MethodInvocation;
import org.glassfish.hk2.api.AOPProxyCtl;
import org.glassfish.hk2.api.ActiveDescriptor;
import org.glassfish.hk2.api.HK2Invocation;
import org.glassfish.hk2.utilities.reflection.ReflectionHelper;
import javassist.util.proxy.MethodHandler;
/**
* This is the handler that runs the aopalliance method interception
*
* @author jwells
*
*/
public class MethodInterceptorHandler implements MethodHandler {
private final ServiceLocatorImpl locator;
private final Map> interceptorLists;
private final ActiveDescriptor underlyingDescriptor;
/* package */ MethodInterceptorHandler(ServiceLocatorImpl locator,
ActiveDescriptor underlyingDescriptor,
Map> interceptorLists) {
this.locator = locator;
this.interceptorLists = interceptorLists;
this.underlyingDescriptor = underlyingDescriptor;
}
/* (non-Javadoc)
* @see javassist.util.proxy.MethodHandler#invoke(java.lang.Object, java.lang.reflect.Method, java.lang.reflect.Method, java.lang.Object[])
*/
@Override
public Object invoke(Object self, Method thisMethod, Method proceed, Object[] args)
throws Throwable {
if (thisMethod.getName().equals(AOPProxyCtl.UNDERLYING_METHOD_NAME)) {
return underlyingDescriptor;
}
List interceptors = interceptorLists.get(thisMethod);
if (interceptors == null || interceptors.isEmpty()) {
return ReflectionHelper.invoke(self, proceed, args, locator.getNeutralContextClassLoader());
}
if (!(interceptors instanceof RandomAccess)) {
// Make sure we are indexable
interceptors = new ArrayList(interceptors);
}
MethodInterceptor nextInterceptor = interceptors.get(0);
return nextInterceptor.invoke(new MethodInvocationImpl(args,
thisMethod, self, interceptors, 0, proceed, null));
}
private class MethodInvocationImpl implements MethodInvocation, HK2Invocation {
private final Object[] arguments; // Live!
private final Method method;
private final Object myself;
private final List interceptors;
private final int index;
private final Method proceed;
private HashMap userData;
private MethodInvocationImpl(Object[] arguments,
Method method,
Object myself,
List interceptors,
int index,
Method proceed,
HashMap userData) {
this.arguments = arguments;
this.method = method;
this.myself = myself;
this.interceptors = interceptors;
this.index = index;
this.proceed = proceed;
this.userData = userData;
}
@Override
public Object[] getArguments() {
return arguments;
}
@Override
public AccessibleObject getStaticPart() {
return method;
}
@Override
public Object getThis() {
return myself;
}
@Override
public Method getMethod() {
return method;
}
@Override
public Object proceed() throws Throwable {
int newIndex = index + 1;
if (newIndex >= interceptors.size()) {
// Call the actual method
return ReflectionHelper.invoke(myself, proceed, arguments, locator.getNeutralContextClassLoader());
}
// Invoke the next interceptor
MethodInterceptor nextInterceptor = interceptors.get(newIndex);
return nextInterceptor.invoke(new MethodInvocationImpl(arguments,
method, myself, interceptors, newIndex, proceed, userData));
}
/* (non-Javadoc)
* @see org.glassfish.hk2.api.HK2Invocation#setUserData(java.lang.String, java.lang.Object)
*/
@Override
public void setUserData(String key, Object data) {
if (key == null) throw new IllegalArgumentException();
if (userData == null) userData = new HashMap();
if (data == null) {
userData.remove(key);
}
else {
userData.put(key, data);
}
}
/* (non-Javadoc)
* @see org.glassfish.hk2.api.HK2Invocation#getUserData(java.lang.String)
*/
@Override
public Object getUserData(String key) {
if (key == null) throw new IllegalArgumentException();
if (userData == null) return null;
return userData.get(key);
}
}
}
