info.archinnov.achilles.entity.operations.EntityInitializer.java Source code

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Here is the source code for info.archinnov.achilles.entity.operations.EntityInitializer.java

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/**
 *
 * Copyright (C) 2012-2013 DuyHai DOAN
 *
 * 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 info.archinnov.achilles.entity.operations;

import static info.archinnov.achilles.entity.metadata.PropertyType.lazyType;
import info.archinnov.achilles.context.PersistenceContext;
import info.archinnov.achilles.entity.metadata.EntityMeta;
import info.archinnov.achilles.entity.metadata.PropertyMeta;
import info.archinnov.achilles.entity.metadata.util.AlreadyLoadedTransformer;
import info.archinnov.achilles.proxy.EntityInterceptor;
import info.archinnov.achilles.type.Counter;
import info.archinnov.achilles.type.CounterBuilder;

import java.lang.reflect.Method;
import java.util.Set;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import com.google.common.collect.FluentIterable;
import com.google.common.collect.Sets;

public class EntityInitializer {
    private static final Logger log = LoggerFactory.getLogger(EntityInitializer.class);

    private EntityProxifier<PersistenceContext> proxifier = new EntityProxifier<PersistenceContext>() {

        @Override
        public <T> EntityInterceptor<PersistenceContext, T> buildInterceptor(PersistenceContext context, T entity,
                Set<Method> alreadyLoaded) {
            return null;
        }
    };

    public <T, CONTEXT extends PersistenceContext> void initializeEntity(T entity, EntityMeta entityMeta,
            EntityInterceptor<CONTEXT, T> interceptor) {

        log.debug("Initializing lazy fields for entity {} of class {}", entity, entityMeta.getClassName());

        Set<PropertyMeta> alreadyLoadedMetas = FluentIterable.from(interceptor.getAlreadyLoaded())
                .transform(new AlreadyLoadedTransformer(entityMeta.getGetterMetas())).toImmutableSet();

        Set<PropertyMeta> allLazyMetas = FluentIterable.from(entityMeta.getPropertyMetas().values())
                .filter(lazyType).toImmutableSet();

        Set<PropertyMeta> toBeLoadedMetas = Sets.difference(allLazyMetas, alreadyLoadedMetas);

        for (PropertyMeta propertyMeta : toBeLoadedMetas) {
            Object value = propertyMeta.getValueFromField(entity);
            if (propertyMeta.isCounter()) {
                Counter counter = (Counter) value;
                Object realObject = proxifier.getRealObject(entity);
                propertyMeta.setValueToField(realObject, CounterBuilder.incr(counter.get()));
            }
        }

        for (PropertyMeta propertyMeta : alreadyLoadedMetas) {
            if (propertyMeta.isCounter()) {
                Object value = propertyMeta.getValueFromField(entity);
                Counter counter = (Counter) value;
                Object realObject = proxifier.getRealObject(entity);
                propertyMeta.setValueToField(realObject, CounterBuilder.incr(counter.get()));
            }
        }
    }
}