/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*/
package org.apache.isis.runtimes.dflt.bytecode.dflt.objectfactory.internal;
import java.lang.reflect.Method;
import java.util.HashMap;
import java.util.Map;
import net.sf.cglib.proxy.Callback;
import net.sf.cglib.proxy.Enhancer;
import net.sf.cglib.proxy.MethodInterceptor;
import net.sf.cglib.proxy.MethodProxy;
import org.apache.isis.core.commons.lang.ArrayUtils;
import org.apache.isis.core.metamodel.facets.ImperativeFacetUtils;
import org.apache.isis.core.metamodel.facets.ImperativeFacetUtils.ImperativeFacetFlags;
import org.apache.isis.core.metamodel.spec.SpecificationLoader;
import org.apache.isis.core.metamodel.spec.feature.ObjectMember;
import org.apache.isis.core.metamodel.specloader.specimpl.dflt.ObjectSpecificationDefault;
import org.apache.isis.runtimes.dflt.runtime.bytecode.ObjectResolveAndObjectChangedEnhancerAbstract;
import org.apache.isis.runtimes.dflt.runtime.persistence.objectfactory.ObjectChanger;
import org.apache.isis.runtimes.dflt.runtime.persistence.objectfactory.ObjectResolver;
public class ObjectResolveAndObjectChangedEnhancer extends ObjectResolveAndObjectChangedEnhancerAbstract {
private Callback callback;
/**
* Cache of Enhancers, lazy populated.
*/
private final Map<Class<?>, Enhancer> enhancerByClass = new HashMap<Class<?>, Enhancer>();
public ObjectResolveAndObjectChangedEnhancer(final ObjectResolver objectResolver,
final ObjectChanger objectChanger, final SpecificationLoader specificationLoader) {
super(objectResolver, objectChanger, specificationLoader);
createCallback();
}
@Override
protected void createCallback() {
this.callback = new MethodInterceptor() {
@Override
public Object intercept(final Object proxied, final Method proxiedMethod, final Object[] args,
final MethodProxy proxyMethod) throws Throwable {
final boolean ignore = proxiedMethod.getDeclaringClass().equals(Object.class);
ImperativeFacetFlags flags = null;
if (!ignore) {
final ObjectSpecificationDefault targetObjSpec = getJavaSpecificationOfOwningClass(proxiedMethod);
final ObjectMember member = targetObjSpec.getMember(proxiedMethod);
flags = ImperativeFacetUtils.getImperativeFacetFlags(member, proxiedMethod);
if (flags.impliesResolve()) {
objectResolver.resolve(proxied, member.getName());
}
}
final Object proxiedReturn = proxyMethod.invokeSuper(proxied, args);
if (!ignore && flags.impliesObjectChanged()) {
objectChanger.objectChanged(proxied);
}
return proxiedReturn;
}
};
}
@SuppressWarnings("unchecked")
public <T> T newInstance(final Class<T> cls) {
final Enhancer enhancer = lookupOrCreateEnhancerFor(cls);
return (T) enhancer.create();
}
private Enhancer lookupOrCreateEnhancerFor(final Class<?> cls) {
Enhancer enhancer = enhancerByClass.get(cls);
if (enhancer == null) {
enhancer = new Enhancer();
enhancer.setSuperclass(cls);
enhancer.setInterfaces(ArrayUtils.combine(cls.getInterfaces(), new Class<?>[] { CglibEnhanced.class }));
enhancer.setCallback(callback);
enhancerByClass.put(cls, enhancer);
}
return enhancer;
}
}