/*******************************************************************************
 * Copyright (c) 2006, 2008 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;

import org.eclipse.core.resources.IFile;
import org.eclipse.jpt.core.context.java.JavaAttributeMapping;
import org.eclipse.jpt.core.context.java.JavaPersistentAttribute;
import org.eclipse.jpt.core.context.java.JavaPersistentType;
import org.eclipse.jpt.core.context.java.JavaTypeMapping;
import org.eclipse.jpt.core.context.orm.OrmAttributeMapping;
import org.eclipse.jpt.core.context.orm.OrmPersistentAttribute;
import org.eclipse.jpt.core.context.orm.OrmTypeMapping;
import org.eclipse.jpt.core.resource.orm.XmlAttributeMapping;
import org.eclipse.jpt.db.ConnectionProfileFactory;
import org.eclipse.jpt.db.DatabaseFinder;

/**
 * This interface is to be implemented by a JPA vendor to provide extensions to 
 * the core JPA model.  The core JPA model will provide functionality for JPA
 * spec annotations in java, persistence.xml and mapping (orm.xml) files.
 * The org.eclipse.jpt.core.genericPlatform extension supplies 
 * resource models for those file types.  As another vendor option you 
 * will have to supply those resource models as well or different ones 
 * as necessary.
 * 
 * See the org.eclipse.jpt.core.jpaPlatform extension point
 * 
 * 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 JpaPlatform
{
	/**
	 * Get the ID for this platform
	 */
	String getId();

	/**
	 * Set the ID for this platform.  This is an extension
	 * so you can't use a non-default constructor.
	 * 
	 * *************
	 * * IMPORTANT *  For INTERNAL use only!!
	 * *************
	 */
	void setId(String theId);


	// ********** factory **********

	/**
	 * Return a factory responsible for creating core (e.g. JpaProject), resource
	 * (e.g. PersistenceResource), and context (e.g. PersistenceUnit) model
	 * objects
	 */
	JpaFactory getJpaFactory();


	// ********** JPA files **********

	/**
	 * Return a JPA file corresponding to the specified Eclipse file.
	 * Return null if the file's content is unsupported.
	 */
	JpaFile buildJpaFile(JpaProject jpaProject, IFile file);


	// ********** Java annotations **********

	/**
	 * Return an annotation provider responsible for determining what annotations
	 * are supported and constructing java resource model objects
	 */
	JpaAnnotationProvider getAnnotationProvider();


	// ********** Java type mappings **********

	/**
	 * Build a Java type mapping for the specified key and persistent type.
	 * Use identity when comparing keys; so clients must use the same key
	 * constants as the providers.
	 * Throw an IllegalArgumentException if the key is not supported by the
	 * platform.
	 */
	JavaTypeMapping buildJavaTypeMappingFromMappingKey(String key, JavaPersistentType type);

	/**
	 * Build a Java type mapping for the specified annotation and persistent
	 * type. Use identity when comparing annotation names; so clients must
	 * use the same name constants as the providers.
	 * Throw an IllegalArgumentException if the mapping annotation is not
	 * supported by the platform.
	 */
	JavaTypeMapping buildJavaTypeMappingFromAnnotation(String annotationName, JavaPersistentType type);


	// ********** Java attribute mappings **********

	/**
	 * Build a Java attribute mapping for the specified key and persistent attribute.
	 * Use identity when comparing keys; so clients must use the same key
	 * constants as the providers.
	 * Throw an IllegalArgumentException if the key is not supported by the
	 * platform.
	 */
	JavaAttributeMapping buildJavaAttributeMappingFromMappingKey(String key, JavaPersistentAttribute attribute);

	/**
	 * Build a Java attribute mapping for the specified annotation and persistent
	 * attribute. Use identity when comparing annotation names; so clients must
	 * use the same name constants as the providers.
	 * Throw an IllegalArgumentException if the mapping annotation is not
	 * supported by the platform.
	 */
	JavaAttributeMapping buildJavaAttributeMappingFromAnnotation(String annotationName, JavaPersistentAttribute attribute);

	/**
	 * Build a default Java attribute mapping for the specified persistent attribute.
	 */
	JavaAttributeMapping buildDefaultJavaAttributeMapping(JavaPersistentAttribute attribute);

	/**
	 * Return the Java attribute mapping key for the default mapping for the
	 * specified attribute.
	 * @see org.eclipse.jpt.core.context.java.DefaultJavaAttributeMappingProvider#defaultApplies(JavaPersistentAttribute)
	 */
	String getDefaultJavaAttributeMappingKey(JavaPersistentAttribute attribute);

	
	// ********** ORM attribute mappings **********

	/**
	 * Build an ORM attribute mapping for the specified key and persistent attribute.
	 * Use identity when comparing keys; so clients must use the same key
	 * constants as the providers.
	 */
	OrmAttributeMapping buildOrmAttributeMappingFromMappingKey(String key, OrmPersistentAttribute attribute);

	/**
	 * Build a virtual resource attribute mapping to be used when the mapping is not specified in the orm.xml
	 * file.  There is no XmlAttributeMapping in this case, so we build one that delegates to the 
	 * JavaAttributeMapping as necessary
	 */
	XmlAttributeMapping buildVirtualOrmResourceMappingFromMappingKey(String key, OrmTypeMapping ormTypeMapping, JavaAttributeMapping javaAttributeMapping);
	
	// ********** database **********

	/**
	 * Return a connection repository that can be used to query the database
	 * about database metadata.
	 */
	ConnectionProfileFactory getConnectionProfileFactory();

	/**
	 * Return an entity generator database annotation name builder, which is
	 * used by Entity Generation to determine whether and how the entity generator
	 * prints the names of various database objects.
	 */
	EntityGeneratorDatabaseAnnotationNameBuilder getEntityGeneratorDatabaseAnnotationNameBuilder();

	/**
	 * Return a finder that can be used to look up various objects (schemata,
	 * tables, columns, etc.) on the database, respecting the platform's and
	 * database's case-sensitivity.
	 */
	DatabaseFinder getDatabaseFinder();

}