https://github.com/javaee/jpa-spec: Java(TM) Persistence API 
Copyright (c) 2008 - 2013 Oracle Corporation. All rights reserved.
This program and the accompanying materials are made available under the
terms of the Eclipse Public License v1.0 and Eclipse Distribution License v. 1.0
which accompanies this distribution.
The Eclipse Public License is available at http://www.eclipse.org/legal/epl-v10.html
and the Eclipse Distribution License is available at
http://www.eclipse.org/org/documents/edl-v10.php.
Contributors:
    Linda DeMichiel - Java Persistence 2.1
    Linda DeMichiel - Java Persistence 2.0

/*******************************************************************************
 * Copyright (c) 2008 - 2013 Oracle Corporation. All rights reserved.
 *
 * This program and the accompanying materials are made available under the
 * terms of the Eclipse Public License v1.0 and Eclipse Distribution License v. 1.0
 * which accompanies this distribution.
 * The Eclipse Public License is available at http://www.eclipse.org/legal/epl-v10.html
 * and the Eclipse Distribution License is available at
 * http://www.eclipse.org/org/documents/edl-v10.php.
 *
 * Contributors:
 *     Linda DeMichiel - Java Persistence 2.1
 *     Linda DeMichiel - Java Persistence 2.0
 *
 ******************************************************************************/ 
package javax.persistence.metamodel;


Instances of the type Type represent persistent object 
or attribute types.

Type parameters:
  • <X> –  The type of the represented object or attribute
Since:Java Persistence 2.0
/**
 * Instances of the type <code>Type</code> represent persistent object 
 * or attribute types.
 *
 * @param <X>  The type of the represented object or attribute
 *
 * @since Java Persistence 2.0
 */
public interface Type<X> {

       public static enum PersistenceType {

	   
Entity 
/** Entity */
           ENTITY, 

	   
Embeddable class 
/** Embeddable class */
	   EMBEDDABLE, 

	   
Mapped superclass 
/** Mapped superclass */
	   MAPPED_SUPERCLASS, 

	   
Basic type 
/** Basic type */
	   BASIC
       }

    
 Return the persistence type.
 @return persistence type

/**
     *  Return the persistence type.
     *  @return persistence type
     */	
    PersistenceType getPersistenceType();

    
 Return the represented Java type.
 @return Java type

/**
     *  Return the represented Java type.
     *  @return Java type
     */
    Class<X> getJavaType();
}