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 Bindable represent object or attribute types that can be bound into a Path. 
Type parameters:
  • <T> –  The type of the represented object or attribute
Since:Java Persistence 2.0
/**
 * Instances of the type <code>Bindable</code> represent object or attribute types 
 * that can be bound into a {@link javax.persistence.criteria.Path Path}.
 *
 * @param <T>  The type of the represented object or attribute
 *
 * @since Java Persistence 2.0
 *
 */
public interface Bindable<T> {
	
	public static enum BindableType { 

	    
Single-valued attribute type 
/** Single-valued attribute type */
	    SINGULAR_ATTRIBUTE, 

	    
Multi-valued attribute type 
/** Multi-valued attribute type */
	    PLURAL_ATTRIBUTE, 

	    
Entity type 
/** Entity type */
	    ENTITY_TYPE
	}

    
 Return the bindable type of the represented object.
 @return bindable type

/**
     *  Return the bindable type of the represented object.
     *  @return bindable type
     */	
    BindableType getBindableType();
	
    
Return the Java type of the represented object.
If the bindable type of the object is PLURAL_ATTRIBUTE,
the Java element type is returned. If the bindable type is
SINGULAR_ATTRIBUTE or ENTITY_TYPE, 
the Java type of the
represented entity or attribute is returned.

Returns:Java type
/**
     * Return the Java type of the represented object.
     * If the bindable type of the object is <code>PLURAL_ATTRIBUTE</code>,
     * the Java element type is returned. If the bindable type is
     * <code>SINGULAR_ATTRIBUTE</code> or <code>ENTITY_TYPE</code>, 
     * the Java type of the
     * represented entity or attribute is returned.
     * @return Java type
     */
    Class<T> getBindableJavaType();
}