CtxModelObjectDAO.java

/**
 * Copyright (c) 2011, SOCIETIES Consortium (WATERFORD INSTITUTE OF TECHNOLOGY (TSSG), HERIOT-WATT UNIVERSITY (HWU), SOLUTA.NET 
 * (SN), GERMAN AEROSPACE CENTRE (Deutsches Zentrum fuer Luft- und Raumfahrt e.V.) (DLR), Zavod za varnostne tehnologije
 * informacijske družbe in elektronsko poslovanje (SETCCE), INSTITUTE OF COMMUNICATION AND COMPUTER SYSTEMS (ICCS), LAKE
 * COMMUNICATIONS (LAKE), INTEL PERFORMANCE LEARNING SOLUTIONS LTD (INTEL), PORTUGAL TELECOM INOVAÇÃO, SA (PTIN), IBM Corp., 
 * INSTITUT TELECOM (ITSUD), AMITEC DIACHYTI EFYIA PLIROFORIKI KAI EPIKINONIES ETERIA PERIORISMENIS EFTHINIS (AMITEC), TELECOM 
 * ITALIA S.p.a.(TI),  TRIALOG (TRIALOG), Stiftelsen SINTEF (SINTEF), NEC EUROPE LTD (NEC))
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following
 * conditions are met:
 *
 * 1. Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following
 *    disclaimer in the documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING,
 * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT 
 * SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */
package org.societies.context.community.db.impl.model;

import java.io.Serializable;
import java.util.Date;

import javax.persistence.Column;
import javax.persistence.Id;
import javax.persistence.MappedSuperclass;
import javax.persistence.Version;

import org.societies.api.context.model.CtxIdentifier;
import org.societies.api.context.model.CtxModelObject;

/**
 * Describe your class here...
 *
 * @author <a href="mailto:nicolas.liampotis@cn.ntua.gr">Nicolas Liampotis</a> (ICCS)
 * @since 0.5
 */
@MappedSuperclass
public abstract class CtxModelObjectDAO implements Serializable {

	private static final long serialVersionUID = 1333930158344350231L;

	/* The primary key used by Hibernate. */
	@Id
	@Column(name = "id")
	private String id;
	
	@Column(name = "last_modified")
	@Version
	private Date lastModified;
	
	CtxModelObjectDAO(String id) {
		
		this.id = id;
	}
	
	public abstract CtxIdentifier getId();

	public Date getLastModified() {
		
		return this.lastModified;
	}
	
	public void setLastModified(Date lastModified) {
		
		this.lastModified = lastModified;
	}
	
	/**
	 * @see java.lang.Object#hashCode()
	 */
	@Override
    public int hashCode() {
		
        final int prime = 31;
        int result = 1;
        
        result = prime * result
                + ((this.getId() == null) ? 0 : this.getId().hashCode());
        
        return result;
    }

    /**
     * @see java.lang.Object#equals(java.lang.Object)
     */
    @Override
    public boolean equals(Object that) {
    	
        if (this == that)
            return true;
        if (that == null)
            return false;
        if (this.getClass() != that.getClass())
            return false;
        
        CtxModelObject other = (CtxModelObject) that;
        if (this.getId() == null) {
            if (other.getId() != null)
                return false;
        } else if (!this.getId().equals(other.getId()))
            return false;
        
        return true;
    }
}