com.npower.dm.hibernate.entity.ModelIdentifierGenerator.java Source code

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Here is the source code for com.npower.dm.hibernate.entity.ModelIdentifierGenerator.java

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/**
 * $Header: /home/master/nWave-DM-Common/src/com/npower/dm/hibernate/entity/ModelIdentifierGenerator.java,v 1.1 2008/05/08 06:54:26 zhao Exp $
 * $Revision: 1.1 $
 * $Date: 2008/05/08 06:54:26 $
 *
 * ===============================================================================================
 * License, Version 1.1
 *
 * Copyright (c) 1994-2008 NPower Network Software Ltd.  All rights reserved.
 *
 * This SOURCE CODE FILE, which has been provided by NPower as part
 * of a NPower product for use ONLY by licensed users of the product,
 * includes CONFIDENTIAL and PROPRIETARY information of NPower.
 *
 * USE OF THIS SOFTWARE IS GOVERNED BY THE TERMS AND CONDITIONS
 * OF THE LICENSE STATEMENT AND LIMITED WARRANTY FURNISHED WITH
 * THE PRODUCT.
 *
 * IN PARTICULAR, YOU WILL INDEMNIFY AND HOLD NPower, ITS RELATED
 * COMPANIES AND ITS SUPPLIERS, HARMLESS FROM AND AGAINST ANY CLAIMS
 * OR LIABILITIES ARISING OUT OF THE USE, REPRODUCTION, OR DISTRIBUTION
 * OF YOUR PROGRAMS, INCLUDING ANY CLAIMS OR LIABILITIES ARISING OUT OF
 * OR RESULTING FROM THE USE, MODIFICATION, OR DISTRIBUTION OF PROGRAMS
 * OR FILES CREATED FROM, BASED ON, AND/OR DERIVED FROM THIS SOURCE
 * CODE FILE.
 * ===============================================================================================
 */
package com.npower.dm.hibernate.entity;

import java.io.Serializable;
import java.util.Properties;

import org.apache.commons.lang.StringUtils;
import org.hibernate.HibernateException;
import org.hibernate.MappingException;
import org.hibernate.dialect.Dialect;
import org.hibernate.engine.SessionImplementor;
import org.hibernate.id.Configurable;
import org.hibernate.id.IdentifierGenerator;
import org.hibernate.type.Type;

import com.npower.dm.core.Model;

/**
 * @author Zhao DongLu
 * @version $Revision: 1.1 $ $Date: 2008/05/08 06:54:26 $
 */
public class ModelIdentifierGenerator implements IdentifierGenerator, Configurable {

    /**
     * 
     */
    public ModelIdentifierGenerator() {
        super();
    }

    /* (non-Javadoc)
     * @see org.hibernate.id.IdentifierGenerator#generate(org.hibernate.engine.SessionImplementor, java.lang.Object)
     */
    public Serializable generate(SessionImplementor session, Object entity) throws HibernateException {
        if (!(entity instanceof Model)) {
            throw new HibernateException("Entity not implements Model interface.");
        }
        Model model = (Model) entity;
        if (model.getManufacturer() == null || StringUtils.isEmpty(model.getManufacturer().getExternalId())) {
            throw new HibernateException("Could not generate a identifier, missing manufacturer.");
        }
        if (StringUtils.isEmpty(model.getManufacturerModelId())) {
            throw new HibernateException("Could not generate a identifier, missing model externalID.");
        }

        StringBuffer buf = new StringBuffer(model.getManufacturer().getExternalId().toLowerCase().trim());
        buf.append("_");
        buf.append(model.getManufacturerModelId().toLowerCase().trim());
        int id = (int) buf.toString().hashCode();
        // Keep > 0, unsigned number
        if (id < 0) {
            id = Integer.MAX_VALUE + id;
        }
        return new Long(id);
    }

    /* (non-Javadoc)
     * @see org.hibernate.id.Configurable#configure(org.hibernate.type.Type, java.util.Properties, org.hibernate.dialect.Dialect)
     */
    public void configure(Type arg0, Properties arg1, Dialect arg2) throws MappingException {
    }

}