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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.List;
import java.util.RandomAccess;
import org.aopalliance.intercept.ConstructorInterceptor;
import org.aopalliance.intercept.ConstructorInvocation;
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));
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 {
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 ConstructorInvocationImpl(Constructor c,
Object args[],
boolean neutralCCL,
ConstructorAction finalAction,
int index,
List interceptors) {
this.c = c;
this.args = args;
this.neutralCCL = neutralCCL;
this.finalAction = finalAction;
this.index = index;
this.interceptors = interceptors;
}
@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));
return myThis;
}
@SuppressWarnings("rawtypes")
@Override
public Constructor getConstructor() {
return c;
}
}
}