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/*
 * Hibernate, Relational Persistence for Idiomatic Java
 *
 * License: GNU Lesser General Public License (LGPL), version 2.1 or later.
 * See the lgpl.txt file in the root directory or .
 */
package org.hibernate.collection.internal;

import java.io.Serializable;
import java.lang.reflect.Array;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Collections;
import java.util.Iterator;

import org.hibernate.HibernateException;
import org.hibernate.engine.spi.SessionImplementor;
import org.hibernate.engine.spi.SharedSessionContractImplementor;
import org.hibernate.internal.CoreMessageLogger;
import org.hibernate.loader.CollectionAliases;
import org.hibernate.persister.collection.CollectionPersister;
import org.hibernate.type.Type;

import org.jboss.logging.Logger;

/**
 * A persistent wrapper for an array. Lazy initialization
 * is NOT supported. Use of Hibernate arrays is not really
 * recommended.
 *
 * @author Gavin King
 */
public class PersistentArrayHolder extends AbstractPersistentCollection {
	private static final CoreMessageLogger LOG = Logger.getMessageLogger(
			CoreMessageLogger.class,
			PersistentArrayHolder.class.getName()
	);

	protected Object array;

	//just to help out during the load (ugly, i know)
	private transient Class elementClass;
	private transient java.util.List tempList;

	/**
	 * Constructs a PersistentCollection instance for holding an array.
	 *
	 * @param session The session
	 * @param array The array (the persistent "collection").
	 */
	public PersistentArrayHolder(SharedSessionContractImplementor session, Object array) {
		super( session );
		this.array = array;
		setInitialized();
	}

	/**
	 * Constructs a PersistentCollection instance for holding an array.
	 *
	 * @param session The session
	 * @param array The array (the persistent "collection").
	 *
	 * @deprecated {@link #PersistentArrayHolder(SharedSessionContractImplementor, Object)}
	 *             should be used instead.
	 */
	@Deprecated
	public PersistentArrayHolder(SessionImplementor session, Object array) {
		this( (SharedSessionContractImplementor) session, array );
	}

	/**
	 * Constructs a PersistentCollection instance for holding an array.
	 *
	 * @param session The session
	 * @param persister The persister for the array
	 */
	public PersistentArrayHolder(SharedSessionContractImplementor session, CollectionPersister persister) {
		super( session );
		elementClass = persister.getElementClass();
	}

	/**
	 * Constructs a PersistentCollection instance for holding an array.
	 *
	 * @param session The session
	 * @param persister The persister for the array
	 *
	 * @deprecated {@link #PersistentArrayHolder(SharedSessionContractImplementor, CollectionPersister)}
	 *             should be used instead.
	 */
	@Deprecated
	public PersistentArrayHolder(SessionImplementor session, CollectionPersister persister) {
		this( (SharedSessionContractImplementor) session, persister );
	}

	@Override
	public Serializable getSnapshot(CollectionPersister persister) throws HibernateException {
//		final int length = (array==null) ? tempList.size() : Array.getLength( array );
		final int length = Array.getLength( array );
		final Serializable result = (Serializable) Array.newInstance( persister.getElementClass(), length );
		for ( int i=0; i deletes = new ArrayList<>();
		final Serializable sn = getSnapshot();
		final int snSize = Array.getLength( sn );
		final int arraySize = Array.getLength( array );
		int end;
		if ( snSize > arraySize ) {
			for ( int i=arraySize; i= Array.getLength( sn ) || Array.get( sn, i ) == null );
	}

	@Override
	public boolean needsUpdating(Object entry, int i, Type elemType) throws HibernateException {
		final Serializable sn = getSnapshot();
		return i < Array.getLength( sn )
				&& Array.get( sn, i ) != null
				&& Array.get( array, i ) != null
				&& elemType.isDirty( Array.get( array, i ), Array.get( sn, i ), getSession() );
	}

	@Override
	public Object getIndex(Object entry, int i, CollectionPersister persister) {
		return i;
	}

	@Override
	public Object getElement(Object entry) {
		return entry;
	}

	@Override
	public Object getSnapshotElement(Object entry, int i) {
		final Serializable sn = getSnapshot();
		return Array.get( sn, i );
	}

	@Override
	public boolean entryExists(Object entry, int i) {
		return entry != null;
	}
}