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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.
*
* When distributing the software, include this License Header Notice in each
* file and include the License file at packager/legal/LICENSE.txt.
*
* GPL Classpath Exception:
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* exception as provided by Oracle in the GPL Version 2 section of the License
* file that accompanied this code.
*
* Modifications:
* If applicable, add the following below the License Header, with the fields
* enclosed by brackets [] replaced by your own identifying information:
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*/
package org.jvnet.hk2.internal;
import java.lang.reflect.AccessibleObject;
import java.lang.reflect.Constructor;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.RandomAccess;
import org.aopalliance.intercept.ConstructorInterceptor;
import org.aopalliance.intercept.ConstructorInvocation;
import org.glassfish.hk2.api.HK2Invocation;
import org.glassfish.hk2.utilities.reflection.ReflectionHelper;
/**
* @author jwells
*
*/
public class ConstructorInterceptorHandler {
private static final ConstructorAction DEFAULT_ACTION = new ConstructorAction() {
@Override
public Object makeMe(Constructor c, Object[] args, boolean neutralCCL) throws Throwable {
return ReflectionHelper.makeMe(c, args, neutralCCL);
}
};
/**
* Call this to construct objects taking constructor interceptors into consideration
*
* @param c The constructor to invoke
* @param args The arguments to give to the constructor (intially)
* @param neutralCCL Whether or not CCL should be neutral around calls to the constructor
* @param interceptors The set of interceptors (may be null or empty)
* @param action The action to perform to construct the object
* @return The constructed object (as massaged by the interceptors)
* @throws Throwable On error
*/
public static Object construct(Constructor c, Object args[], boolean neutralCCL, List interceptors, ConstructorAction action) throws Throwable {
if (interceptors == null || interceptors.isEmpty()) {
return action.makeMe(c, args, neutralCCL);
}
if (!(interceptors instanceof RandomAccess)) {
interceptors = new ArrayList(interceptors);
}
ConstructorInterceptor firstInterceptor = interceptors.get(0);
Object retVal = firstInterceptor.construct(new ConstructorInvocationImpl(c,
args,
neutralCCL,
action,
0,
interceptors,
null));
if (retVal == null) {
throw new AssertionError("ConstructorInterceptor construct method returned null for " + c);
}
return retVal;
}
/**
* Call this to construct objects taking constructor interceptors into consideration
*
* @param c The constructor to invoke
* @param args The arguments to give to the constructor (intially)
* @param neutralCCL Whether or not CCL should be neutral around calls to the constructor
* @param interceptors The set of interceptors (may be null or empty)
* @return The constructed object (as massaged by the interceptors)
* @throws Throwable On error
*/
public static Object construct(Constructor c, Object args[], boolean neutralCCL, List interceptors) throws Throwable {
return construct(c, args, neutralCCL, interceptors, DEFAULT_ACTION);
}
private static class ConstructorInvocationImpl implements ConstructorInvocation, HK2Invocation {
private final Constructor c;
private final Object[] args;
private final boolean neutralCCL;
private Object myThis = null;
private final int index;
private final ConstructorAction finalAction;
private final List interceptors;
private HashMap userData;
private ConstructorInvocationImpl(Constructor c,
Object args[],
boolean neutralCCL,
ConstructorAction finalAction,
int index,
List interceptors,
HashMap userData) {
this.c = c;
this.args = args;
this.neutralCCL = neutralCCL;
this.finalAction = finalAction;
this.index = index;
this.interceptors = interceptors;
this.userData = userData;
}
@Override
public Object[] getArguments() {
return args;
}
@Override
public AccessibleObject getStaticPart() {
return c;
}
@Override
public Object getThis() {
return myThis;
}
@Override
public Object proceed() throws Throwable {
int newIndex = index + 1;
if (newIndex >= interceptors.size()) {
myThis = finalAction.makeMe(c, args, neutralCCL);
return myThis;
}
// Invoke the next interceptor
ConstructorInterceptor nextInterceptor = interceptors.get(newIndex);
myThis = nextInterceptor.construct(new ConstructorInvocationImpl(c, args, neutralCCL,
finalAction, newIndex, interceptors, userData));
return myThis;
}
@SuppressWarnings("rawtypes")
@Override
public Constructor getConstructor() {
return c;
}
/* (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);
}
}
}
