package com.tesora.dve.distribution;

/*
 * #%L
 * Tesora Inc.
 * Database Virtualization Engine
 * %%
 * Copyright (C) 2011 - 2014 Tesora Inc.
 * %%
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License, version 3,
 * as published by the Free Software Foundation.
 * 
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU Affero General Public License for more details.
 * 
 * You should have received a copy of the GNU Affero General Public License
 * along with this program. If not, see <http://www.gnu.org/licenses/>.
 * #L%
 */


import javax.persistence.DiscriminatorValue;
import javax.persistence.Entity;

import com.tesora.dve.common.catalog.CatalogDAO;
import com.tesora.dve.common.catalog.DistributionModel;
import com.tesora.dve.common.catalog.StorageGroup;
import com.tesora.dve.exceptions.PEException;
import com.tesora.dve.sql.schema.SchemaContext.DistKeyOpType;
import com.tesora.dve.worker.WorkerGroup.MappingSolution;

@Entity
@DiscriminatorValue(ContainerDistributionModel.MODEL_NAME)
public class ContainerDistributionModel extends DistributionModel {

	private static final long serialVersionUID = 1L;
	public final static String MODEL_NAME = "Container";

	public final static ContainerDistributionModel SINGLETON = new ContainerDistributionModel(); 

	public ContainerDistributionModel() {
		super(MODEL_NAME);
	}

	@Override
	public MappingSolution mapKeyForInsert(CatalogDAO c, StorageGroup sg, IKeyValue key) throws PEException {
		return getRealDistributionModel(key).mapKeyForInsert(c, sg, key);
	}
	
	@Override
	public MappingSolution mapKeyForUpdate(CatalogDAO c, StorageGroup sg, IKeyValue key) throws PEException {
		return getRealDistributionModel(key).mapKeyForUpdate(c, sg, key);
	}

	@Override
	public MappingSolution mapKeyForQuery(CatalogDAO c, StorageGroup sg, IKeyValue key, DistKeyOpType type) throws PEException {
		return getRealDistributionModel(key).mapKeyForQuery(c, sg, key, type);
	}

	private DistributionModel getRealDistributionModel(IKeyValue kv) throws PEException {
		DistributionModel delegate = kv.getContainerDistributionModel();
		if (delegate == null)
			throw new PEException("Invalid key value.  " + kv.getQualifiedTableName() + " is container distributed but has no backing distribution.");
		return delegate;
	}

	@Override
	public void onUpdate() {
	}

	@Override
	public void onDrop() {
	}
	
}