com.erinors.hpb.server.serviceimpl.PersistentObjectManagerImpl.java Source code

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Here is the source code for com.erinors.hpb.server.serviceimpl.PersistentObjectManagerImpl.java

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/*
 * Copyright 2009 Norbert Sndor
 *
 * Licensed 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 com.erinors.hpb.server.serviceimpl;

import java.util.ArrayList;
import java.util.Collection;
import java.util.Collections;
import java.util.Comparator;
import java.util.List;

import javax.persistence.EntityManager;
import javax.persistence.PersistenceContext;

import org.springframework.beans.BeansException;
import org.springframework.beans.factory.BeanFactory;
import org.springframework.beans.factory.BeanFactoryAware;
import org.springframework.beans.factory.ListableBeanFactory;
import org.springframework.context.ApplicationListener;
import org.springframework.context.event.ContextRefreshedEvent;
import org.springframework.core.OrderComparator;
import org.springframework.stereotype.Service;

import com.erinors.hpb.server.handler.PersistentObjectHandler;
import com.erinors.hpb.server.service.PersistentObjectManager;

/**
 * @author Norbert Sndor
 */
@Service
public class PersistentObjectManagerImpl
        implements PersistentObjectManager, BeanFactoryAware, ApplicationListener<ContextRefreshedEvent> {
    private ListableBeanFactory beanFactory;

    private List<? extends PersistentObjectHandler> handlers;

    @PersistenceContext
    private EntityManager entityManager;

    @Override
    public void setBeanFactory(BeanFactory beanFactory) throws BeansException {
        if (!(beanFactory instanceof ListableBeanFactory)) {
            throw new RuntimeException("ListableBeanFactory expected but got " + beanFactory);
        }

        this.beanFactory = (ListableBeanFactory) beanFactory;
    }

    @Override
    public void onApplicationEvent(ContextRefreshedEvent event) {
        handlers = new ArrayList<PersistentObjectHandler>(
                (Collection<? extends PersistentObjectHandler>) beanFactory
                        .getBeansOfType(PersistentObjectHandler.class).values());

        Collections.sort(handlers, new Comparator<PersistentObjectHandler>() {
            private OrderComparator orderComparator = new OrderComparator();

            @Override
            public int compare(PersistentObjectHandler o1, PersistentObjectHandler o2) {
                return orderComparator.compare(o1, o2);
            }
        });
    }

    @SuppressWarnings("unchecked")
    @Override
    public <T> T clone(T object) {
        return (T) new CloningContextImpl(handlers).clone(object);
    }

    @SuppressWarnings("unchecked")
    @Override
    public <T> T merge(T object) {
        return (T) new MergingContextImpl(handlers, entityManager).merge(object);
    }
}
// TODO support other persistent collection types