EntityCollectionBase.java

/*
 * Copyright 2010-2011 Ning, Inc.
 *
 * Ning 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 com.ning.billing.account.api;

import com.ning.billing.account.dao.IEntityCollectionDao;

import java.util.*;

public abstract class EntityCollectionBase<T extends IEntity> {
    protected Map<String, T> entities = new HashMap<String, T>();
    protected final UUID objectId;
    protected final String objectType;

    public EntityCollectionBase(UUID objectId, String objectType) {
        this.objectId = objectId;
        this.objectType = objectType;
    }

    public List<T> getNewEntities() {
        List<T> newEntities = new ArrayList<T>();
        for (T entity : entities.values()) {
            if (entity.isNew()) {
                newEntities.add(entity);
            }
        }

        return newEntities;
    }

    public List<T> getUpdatedEntities() {
        List<T> updatedEntities = new ArrayList<T>();
        for (T entity : entities.values()) {
            if (!entity.isNew()) {
                updatedEntities.add(entity);
            }
        }

        return updatedEntities;
    }

    public void save() {
        IEntityCollectionDao<T> dao = getCollectionDao();

        dao.create(objectId.toString(), objectType, getNewEntities());
        dao.update(objectId.toString(), objectType, getUpdatedEntities());
        setEntitiesAsSaved();
    }

    private void setEntitiesAsSaved() {
        for (T entity : entities.values()) {
            entity.setAsSaved();
        }
    }

    public void load() {
        IEntityCollectionDao<T> dao = getCollectionDao();

        List<T> entities = dao.load(objectId.toString(), objectType);
        this.entities.clear();
        if (entities != null) {
            for (T entity : entities) {
                this.entities.put(getEntityKey(entity), entity);
            }
        }
    }

    protected abstract String getEntityKey(T entity);
    protected abstract IEntityCollectionDao<T> getCollectionDao();
}