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The Java Persistence API (JPA) : a standard interface-based Java model abstraction of persistence, developed by the JCP.

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/*
 * Copyright (c) 2008, 2009, 2011 Oracle, Inc. 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.
 */
package javax.persistence.metamodel;

/**
 * Instances of the type Bindable represent object or attribute types
 * that can be bound into a {@link javax.persistence.criteria.Path Path}.
 *
 * @param   The type of the represented object or attribute
 * @since Java Persistence 2.0
 */
public interface Bindable {
	public static enum BindableType {
		/**
		 * Single-valued attribute type
		 */
		SINGULAR_ATTRIBUTE,

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

		/**
		 * Entity type
		 */
		ENTITY_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.
	 *
	 * @return Java type
	 */
	Class getBindableJavaType();
}