/*
* 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.javassist.objectfactory.internal;
import java.lang.reflect.Method;
import javassist.util.proxy.MethodFilter;
import javassist.util.proxy.MethodHandler;
import javassist.util.proxy.ProxyFactory;
import javassist.util.proxy.ProxyObject;
import org.apache.isis.core.commons.exceptions.IsisException;
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 MethodHandler methodHandler;
public ObjectResolveAndObjectChangedEnhancer(final ObjectResolver objectResolver, final ObjectChanger objectChanger, final SpecificationLoader specificationLoader) {
super(objectResolver, objectChanger, specificationLoader);
createCallback();
}
@Override
protected void createCallback() {
this.methodHandler = new MethodHandler() {
@Override
public Object invoke(final Object proxied, final Method proxyMethod, final Method proxiedMethod, final Object[] args) throws Throwable {
final boolean ignore = proxyMethod.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 = proxiedMethod.invoke(proxied, args); // execute
// the
// original
// method.
if (!ignore && flags.impliesObjectChanged()) {
objectChanger.objectChanged(proxied);
}
return proxiedReturn;
}
};
}
@SuppressWarnings("unchecked")
public <T> T newInstance(final Class<T> cls) {
final ProxyFactory proxyFactory = new ProxyFactory();
proxyFactory.setSuperclass(cls);
proxyFactory.setInterfaces(ArrayUtils.combine(cls.getInterfaces(), new Class<?>[] { JavassistEnhanced.class }));
proxyFactory.setFilter(new MethodFilter() {
@Override
public boolean isHandled(final Method m) {
// ignore finalize()
return !m.getName().equals("finalize");
}
});
final Class<T> proxySubclass = proxyFactory.createClass();
try {
final T newInstance = proxySubclass.newInstance();
final ProxyObject proxyObject = (ProxyObject) newInstance;
proxyObject.setHandler(methodHandler);
return newInstance;
} catch (final InstantiationException e) {
throw new IsisException(e);
} catch (final IllegalAccessException e) {
throw new IsisException(e);
}
}
}