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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;

/**
 * Represents an attribute of a Java type.
 *
 * @param  The represented type that contains the attribute
 * @param  The type of the represented attribute
 * @since Java Persistence 2.0
 */
public interface Attribute {
	public static enum PersistentAttributeType {
		/**
		 * Many-to-one association
		 */
		MANY_TO_ONE,

		/**
		 * One-to-one association
		 */
		ONE_TO_ONE,

		/**
		 * Basic attribute
		 */
		BASIC,

		/**
		 * Embeddable class attribute
		 */
		EMBEDDED,

		/**
		 * Many-to-many association
		 */
		MANY_TO_MANY,

		/**
		 * One-to-many association
		 */
		ONE_TO_MANY,

		/**
		 * Element collection
		 */
		ELEMENT_COLLECTION
	}

	/**
	 * Return the name of the attribute.
	 *
	 * @return name
	 */
	String getName();

	/**
	 * Return the persistent attribute type for the attribute.
	 *
	 * @return persistent attribute type
	 */
	PersistentAttributeType getPersistentAttributeType();

	/**
	 * Return the managed type representing the type in which
	 * the attribute was declared.
	 *
	 * @return declaring type
	 */
	ManagedType getDeclaringType();

	/**
	 * Return the Java type of the represented attribute.
	 *
	 * @return Java type
	 */
	Class getJavaType();

	/**
	 * Return the java.lang.reflect.Member for the represented
	 * attribute.
	 *
	 * @return corresponding java.lang.reflect.Member
	 */
	java.lang.reflect.Member getJavaMember();

	/**
	 * Is the attribute an association.
	 *
	 * @return boolean indicating whether the attribute
	 *         corresponds to an association
	 */
	boolean isAssociation();

	/**
	 * Is the attribute collection-valued (represents a Collection,
	 * Set, List, or Map).
	 *
	 * @return boolean indicating whether the attribute is
	 *         collection-valued
	 */
	boolean isCollection();
}