package ejava.examples.ejbwar.inventory.bo;
   
   import java.io.Serializable;
   
   import javax.persistence.Column;
   import javax.persistence.MappedSuperclass;
   import javax.persistence.Version;
   import javax.xml.bind.annotation.XmlAttribute;
   
  /**
   * This class provides base definition and helper methods for representations
   * within the inventory domain.
   */
  @SuppressWarnings("serial")
  @MappedSuperclass
  public abstract class InventoryRepresentation implements Serializable {
  	public static final String NAMESPACE = "http://webejb.ejava.info/inventory";
  	
  	@Version
  	@Column(name="VERSION")
  	private int version;
  	
  	/**
  	 * This property is added to each entity so that we can have better 
  	 * control over concurrent updates
  	 * @return
  	 */
  	@XmlAttribute(required=true)
  	public int getVersion() { return version; }
  	public void setVersion(int version) {
  		this.version = version;
  	}
  }