src/javax/persistence/metamodel/SingularAttribute.java

/*******************************************************************************
 * Copyright (c) 1998, 2009 Oracle. 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:
 *     dclarke - Java Persistence 2.0 - Proposed Final Draft (March 13, 2009)
 *               Specification available from http://jcp.org/en/jsr/detail?id=317
*     gyorke  - Post PFD updates
 *
 * Java(TM) Persistence API, Version 2.0 - EARLY ACCESS
 * This is an implementation of an early-draft specification developed under the 
 * Java Community Process (JCP).  The code is untested and presumed not to be a  
 * compatible implementation of JSR 317: Java(TM) Persistence API, Version 2.0.   
 * We encourage you to migrate to an implementation of the Java(TM) Persistence 
 * API, Version 2.0 Specification that has been tested and verified to be compatible 
 * as soon as such an implementation is available, and we encourage you to retain 
 * this notice in any implementation of Java(TM) Persistence API, Version 2.0 
 * Specification that you distribute.
 ******************************************************************************/
package javax.persistence.metamodel;

/**
 * Instances of the type SingularAttribute represents persistent 
 * single-valued properties or fields.
 *
 * @param <X> The type containing the represented attribute
 * @param <T> The type of the represented attribute
 */
public interface SingularAttribute<X, T> 
		extends Attribute<X, T>, Bindable<T> {
	
    /**
     *  Is the attribute an id attribute.
     *  @return boolean indicating whether or not an id
     */
    boolean isId();

    /**
     *  Is the attribute a version attribute.
     *  @return boolean indicating whether or not a version attribute
     */
    boolean isVersion();

    /** 
     *  Can the attribute be null.
     *  @return boolean indicating whether or not the attribute can
     * 				be null
     */
    boolean isOptional();

    /**
     * Return the type that represents the type of the attribute.
     * @return type of attribute
     */
    Type<T> getType();
}