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/*
 * Hibernate, Relational Persistence for Idiomatic Java
 *
 * Copyright (c) 2011, Red Hat Inc. or third-party contributors as
 * indicated by the @author tags or express copyright attribution
 * statements applied by the authors.  All third-party contributions are
 * distributed under license by Red Hat Inc.
 *
 * This copyrighted material is made available to anyone wishing to use, modify,
 * copy, or redistribute it subject to the terms and conditions of the GNU
 * Lesser General Public License, as published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
 * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public License
 * for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with this distribution; if not, write to:
 * Free Software Foundation, Inc.
 * 51 Franklin Street, Fifth Floor
 * Boston, MA  02110-1301  USA
 */
package org.hibernate.event.service.internal;

import java.lang.reflect.Array;
import java.util.Collections;
import java.util.HashMap;
import java.util.Map;

import org.hibernate.HibernateException;
import org.hibernate.event.internal.DefaultAutoFlushEventListener;
import org.hibernate.event.internal.DefaultDeleteEventListener;
import org.hibernate.event.internal.DefaultDirtyCheckEventListener;
import org.hibernate.event.internal.DefaultEvictEventListener;
import org.hibernate.event.internal.DefaultFlushEntityEventListener;
import org.hibernate.event.internal.DefaultFlushEventListener;
import org.hibernate.event.internal.DefaultInitializeCollectionEventListener;
import org.hibernate.event.internal.DefaultLoadEventListener;
import org.hibernate.event.internal.DefaultLockEventListener;
import org.hibernate.event.internal.DefaultMergeEventListener;
import org.hibernate.event.internal.DefaultPersistEventListener;
import org.hibernate.event.internal.DefaultPersistOnFlushEventListener;
import org.hibernate.event.internal.DefaultPostLoadEventListener;
import org.hibernate.event.internal.DefaultPreLoadEventListener;
import org.hibernate.event.internal.DefaultRefreshEventListener;
import org.hibernate.event.internal.DefaultReplicateEventListener;
import org.hibernate.event.internal.DefaultResolveNaturalIdEventListener;
import org.hibernate.event.internal.DefaultSaveEventListener;
import org.hibernate.event.internal.DefaultSaveOrUpdateEventListener;
import org.hibernate.event.internal.DefaultUpdateEventListener;
import org.hibernate.event.service.spi.DuplicationStrategy;
import org.hibernate.event.service.spi.EventListenerRegistrationException;
import org.hibernate.event.service.spi.EventListenerRegistry;
import org.hibernate.event.spi.EventType;

import static org.hibernate.event.spi.EventType.AUTO_FLUSH;
import static org.hibernate.event.spi.EventType.DELETE;
import static org.hibernate.event.spi.EventType.DIRTY_CHECK;
import static org.hibernate.event.spi.EventType.EVICT;
import static org.hibernate.event.spi.EventType.FLUSH;
import static org.hibernate.event.spi.EventType.FLUSH_ENTITY;
import static org.hibernate.event.spi.EventType.INIT_COLLECTION;
import static org.hibernate.event.spi.EventType.LOAD;
import static org.hibernate.event.spi.EventType.LOCK;
import static org.hibernate.event.spi.EventType.MERGE;
import static org.hibernate.event.spi.EventType.PERSIST;
import static org.hibernate.event.spi.EventType.PERSIST_ONFLUSH;
import static org.hibernate.event.spi.EventType.POST_COLLECTION_RECREATE;
import static org.hibernate.event.spi.EventType.POST_COLLECTION_REMOVE;
import static org.hibernate.event.spi.EventType.POST_COLLECTION_UPDATE;
import static org.hibernate.event.spi.EventType.POST_COMMIT_DELETE;
import static org.hibernate.event.spi.EventType.POST_COMMIT_INSERT;
import static org.hibernate.event.spi.EventType.POST_COMMIT_UPDATE;
import static org.hibernate.event.spi.EventType.POST_DELETE;
import static org.hibernate.event.spi.EventType.POST_INSERT;
import static org.hibernate.event.spi.EventType.POST_LOAD;
import static org.hibernate.event.spi.EventType.POST_UPDATE;
import static org.hibernate.event.spi.EventType.PRE_COLLECTION_RECREATE;
import static org.hibernate.event.spi.EventType.PRE_COLLECTION_REMOVE;
import static org.hibernate.event.spi.EventType.PRE_COLLECTION_UPDATE;
import static org.hibernate.event.spi.EventType.PRE_DELETE;
import static org.hibernate.event.spi.EventType.PRE_INSERT;
import static org.hibernate.event.spi.EventType.PRE_LOAD;
import static org.hibernate.event.spi.EventType.PRE_UPDATE;
import static org.hibernate.event.spi.EventType.REFRESH;
import static org.hibernate.event.spi.EventType.REPLICATE;
import static org.hibernate.event.spi.EventType.RESOLVE_NATURAL_ID;
import static org.hibernate.event.spi.EventType.SAVE;
import static org.hibernate.event.spi.EventType.SAVE_UPDATE;
import static org.hibernate.event.spi.EventType.UPDATE;

/**
 * @author Steve Ebersole
 */
public class EventListenerRegistryImpl implements EventListenerRegistry {
	private Map listenerClassToInstanceMap = new HashMap();

	private Map registeredEventListenersMap = prepareListenerMap();

	@SuppressWarnings({ "unchecked" })
	public  EventListenerGroupImpl getEventListenerGroup(EventType eventType) {
		EventListenerGroupImpl listeners = registeredEventListenersMap.get( eventType );
		if ( listeners == null ) {
			throw new HibernateException( "Unable to find listeners for type [" + eventType.eventName() + "]" );
		}
		return listeners;
	}

	@Override
	public void addDuplicationStrategy(DuplicationStrategy strategy) {
		for ( EventListenerGroupImpl group : registeredEventListenersMap.values() ) {
			group.addDuplicationStrategy( strategy );
		}
	}

	@Override
	public  void setListeners(EventType type, Class... listenerClasses) {
		setListeners( type, resolveListenerInstances( type, listenerClasses ) );
	}

	@SuppressWarnings( {"unchecked"})
	private  T[] resolveListenerInstances(EventType type, Class... listenerClasses) {
		T[] listeners = (T[]) Array.newInstance( type.baseListenerInterface(), listenerClasses.length );
		for ( int i = 0; i < listenerClasses.length; i++ ) {
			listeners[i] = resolveListenerInstance( listenerClasses[i] );
		}
		return listeners;
	}

	@SuppressWarnings( {"unchecked"})
	private  T resolveListenerInstance(Class listenerClass) {
		T listenerInstance = (T) listenerClassToInstanceMap.get( listenerClass );
		if ( listenerInstance == null ) {
			listenerInstance = instantiateListener( listenerClass );
			listenerClassToInstanceMap.put( listenerClass, listenerInstance );
		}
		return listenerInstance;
	}

	private  T instantiateListener(Class listenerClass) {
		try {
			return listenerClass.newInstance();
		}
		catch ( Exception e ) {
			throw new EventListenerRegistrationException(
					"Unable to instantiate specified event listener class: " + listenerClass.getName(),
					e
			);
		}
	}

	@Override
	public  void setListeners(EventType type, T... listeners) {
		EventListenerGroupImpl registeredListeners = getEventListenerGroup( type );
		registeredListeners.clear();
		if ( listeners != null ) {
			for ( int i = 0, max = listeners.length; i < max; i++ ) {
				registeredListeners.appendListener( listeners[i] );
			}
		}
	}

	@Override
	public  void appendListeners(EventType type, Class... listenerClasses) {
		appendListeners( type, resolveListenerInstances( type, listenerClasses ) );
	}

	@Override
	public  void appendListeners(EventType type, T... listeners) {
		getEventListenerGroup( type ).appendListeners( listeners );
	}

	@Override
	public  void prependListeners(EventType type, Class... listenerClasses) {
		prependListeners( type, resolveListenerInstances( type, listenerClasses ) );
	}

	@Override
	public  void prependListeners(EventType type, T... listeners) {
		getEventListenerGroup( type ).prependListeners( listeners );
	}

	private static Map prepareListenerMap() {
		final Map workMap = new HashMap();

		// auto-flush listeners
		prepareListeners(
				AUTO_FLUSH,
				new DefaultAutoFlushEventListener(),
				workMap
		);

		// create listeners
		prepareListeners(
				PERSIST,
				new DefaultPersistEventListener(),
				workMap
		);

		// create-onflush listeners
		prepareListeners(
				PERSIST_ONFLUSH,
				new DefaultPersistOnFlushEventListener(),
				workMap
		);

		// delete listeners
		prepareListeners(
				DELETE,
				new DefaultDeleteEventListener(),
				workMap
		);

		// dirty-check listeners
		prepareListeners(
				DIRTY_CHECK,
				new DefaultDirtyCheckEventListener(),
				workMap
		);

		// evict listeners
		prepareListeners(
				EVICT,
				new DefaultEvictEventListener(),
				workMap
		);

		// flush listeners
		prepareListeners(
				FLUSH,
				new DefaultFlushEventListener(),
				workMap
		);

		// flush-entity listeners
		prepareListeners(
				FLUSH_ENTITY,
				new DefaultFlushEntityEventListener(),
				workMap
		);

		// load listeners
		prepareListeners(
				LOAD,
				new DefaultLoadEventListener(),
				workMap
		);

		// resolve natural-id listeners
		prepareListeners( 
				RESOLVE_NATURAL_ID, 
				new DefaultResolveNaturalIdEventListener(), 
				workMap 
		);

		// load-collection listeners
		prepareListeners(
				INIT_COLLECTION,
				new DefaultInitializeCollectionEventListener(),
				workMap
		);

		// lock listeners
		prepareListeners(
				LOCK,
				new DefaultLockEventListener(),
				workMap
		);

		// merge listeners
		prepareListeners(
				MERGE,
				new DefaultMergeEventListener(),
				workMap
		);

		// pre-collection-recreate listeners
		prepareListeners(
				PRE_COLLECTION_RECREATE,
				workMap
		);

		// pre-collection-remove listeners
		prepareListeners(
				PRE_COLLECTION_REMOVE,
				workMap
		);

		// pre-collection-update listeners
		prepareListeners(
				PRE_COLLECTION_UPDATE,
				workMap
		);

		// pre-delete listeners
		prepareListeners(
				PRE_DELETE,
				workMap
		);

		// pre-insert listeners
		prepareListeners(
				PRE_INSERT,
				workMap
		);

		// pre-load listeners
		prepareListeners(
				PRE_LOAD,
				new DefaultPreLoadEventListener(),
				workMap
		);

		// pre-update listeners
		prepareListeners(
				PRE_UPDATE,
				workMap
		);

		// post-collection-recreate listeners
		prepareListeners(
				POST_COLLECTION_RECREATE,
				workMap
		);

		// post-collection-remove listeners
		prepareListeners(
				POST_COLLECTION_REMOVE,
				workMap
		);

		// post-collection-update listeners
		prepareListeners(
				POST_COLLECTION_UPDATE,
				workMap
		);

		// post-commit-delete listeners
		prepareListeners(
				POST_COMMIT_DELETE,
				workMap
		);

		// post-commit-insert listeners
		prepareListeners(
				POST_COMMIT_INSERT,
				workMap
		);

		// post-commit-update listeners
		prepareListeners(
				POST_COMMIT_UPDATE,
				workMap
		);

		// post-delete listeners
		prepareListeners(
				POST_DELETE,
				workMap
		);

		// post-insert listeners
		prepareListeners(
				POST_INSERT,
				workMap
		);

		// post-load listeners
		prepareListeners(
				POST_LOAD,
				new DefaultPostLoadEventListener(),
				workMap
		);

		// post-update listeners
		prepareListeners(
				POST_UPDATE,
				workMap
		);

		// update listeners
		prepareListeners(
				UPDATE,
				new DefaultUpdateEventListener(),
				workMap
		);

		// refresh listeners
		prepareListeners(
				REFRESH,
				new DefaultRefreshEventListener(),
				workMap
		);

		// replicate listeners
		prepareListeners(
				REPLICATE,
				new DefaultReplicateEventListener(),
				workMap
		);

		// save listeners
		prepareListeners(
				SAVE,
				new DefaultSaveEventListener(),
				workMap
		);

		// save-update listeners
		prepareListeners(
				SAVE_UPDATE,
				new DefaultSaveOrUpdateEventListener(),
				workMap
		);

		return Collections.unmodifiableMap( workMap );
	}

	private static  void prepareListeners(EventType type, Map map) {
		prepareListeners( type, null, map );
	}

	private static  void prepareListeners(EventType type, T defaultListener, Map map) {
		final EventListenerGroupImpl listeners = new EventListenerGroupImpl( type );
		if ( defaultListener != null ) {
			listeners.appendListener( defaultListener );
		}
		map.put( type, listeners  );
	}

}




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