/*******************************************************************************
 * Copyright (c) 2007, 2009 Oracle. All rights reserved.
 * This program and the accompanying materials are made available under the
 * terms of the Eclipse Public License v1.0, which accompanies this distribution
 * and is available at http://www.eclipse.org/legal/epl-v10.html.
 * 
 * Contributors:
 *     Oracle - initial API and implementation
 ******************************************************************************/
package org.eclipse.jpt.core.context.persistence;

import org.eclipse.jpt.core.JpaStructureNode;
import org.eclipse.jpt.core.context.PersistentType;
import org.eclipse.jpt.core.context.XmlContextNode;
import org.eclipse.jpt.core.context.java.JavaPersistentType;
import org.eclipse.jpt.core.resource.persistence.XmlJavaClassRef;

/**
 * Context model corresponding to the XML resource model
 * {@link XmlJavaClassRef}, which corresponds to the <code>class<code> element
 * in the <code>persistence.xml</code> file.
 * This is also used for "implied" class refs; i.e. class refs that are not
 * explicitly listed in the <code>persistence.xml</code> file.
 * <p>
 * Provisional API: This interface is part of an interim API that is still
 * under development and expected to change significantly before reaching
 * stability. It is available at this early stage to solicit feedback from
 * pioneering adopters on the understanding that any code that uses this API
 * will almost certainly be broken (repeatedly) as the API evolves.
 */
public interface ClassRef
	extends XmlContextNode, JpaStructureNode, PersistentType.Owner
{
	/**
	 * Return whether the class ref is a reference to the specified type.
	 */
	boolean isFor(String typeName);
	
	/**
	 * Return true if the mapping file ref is "virtual";
	 * return false if the mapping file ref is represented by an entry in the
	 * persistence.xml file.
	 */
	boolean isVirtual();
	
	XmlJavaClassRef getResourceClassRef();
	
	// **************** class name *********************************************
	
	/**
	 * String constant associated with changes to the class name
	 */
	final static String CLASS_NAME_PROPERTY = "className"; //$NON-NLS-1$
	
	/**
	 * Return the class name of the class ref.
	 */
	String getClassName();
	
	/**
	 * Set the class name of the class ref.
	 */
	void setClassName(String className);
	
	
	// **************** java persistent type ***********************************
	
	/**
	 * String constant associated with changes to the java persistent type
	 */
	final static String JAVA_PERSISTENT_TYPE_PROPERTY = "javaPersistentType"; //$NON-NLS-1$
	
	/**
	 * Return the JavaPersistentType that corresponds to this IClassRef.
	 * This can be null.
	 * This is not settable by users of this API.
	 */
	JavaPersistentType getJavaPersistentType();
	
	
	// **************** update **************************************
	
	/**
	 * Update the ClassRef context model object to match the XmlJavaClassRef 
	 * resource model object. see {@link org.eclipse.jpt.core.JpaProject#update()}
	 */
	void update();
	
	/**
	 * Update the ClassRef context model object to match the className. This is used
	 * for impliedClassRefs in the PersistenceUnit.
	 * see {@link org.eclipse.jpt.core.JpaProject#update()}
	 */
	void update(String className);
	
	
	// *************************************************************************
	
	/**
	 * Return whether the text representation of this persistence unit contains
	 * the given text offset
	 */
	boolean containsOffset(int textOffset);
	
}