org.hibernate.envers.internal.entities.mapper.relation.lazy.initializor.AbstractCollectionInitializor Maven / Gradle / Ivy

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Hibernate's core ORM functionality

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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.envers.internal.entities.mapper.relation.lazy.initializor;

import java.util.List;

import org.hibernate.engine.spi.SharedSessionContractImplementor;
import org.hibernate.envers.internal.entities.EntityInstantiatorImpl;
import org.hibernate.envers.internal.entities.mapper.relation.query.RelationQueryGenerator;
import org.hibernate.envers.internal.reader.AuditReaderImplementor;
import org.hibernate.envers.metamodel.spi.EntityInstantiator;

/**
 * Initializes a persistent collection.
 *
 * @author Adam Warski (adam at warski dot org)
 * @author Chris Cranford
 */
public abstract class AbstractCollectionInitializor implements Initializor {
	private final AuditReaderImplementor versionsReader;
	private final RelationQueryGenerator queryGenerator;
	private final Object primaryKey;
	protected final Number revision;
	protected final boolean removed;
	protected final EntityInstantiator entityInstantiator;

	public AbstractCollectionInitializor(
			AuditReaderImplementor versionsReader,
			RelationQueryGenerator queryGenerator,
			Object primaryKey, Number revision, boolean removed) {
		this.versionsReader = versionsReader;
		this.queryGenerator = queryGenerator;
		this.primaryKey = primaryKey;
		this.revision = revision;
		this.removed = removed;

		entityInstantiator = new EntityInstantiatorImpl( versionsReader );
	}

	protected abstract T initializeCollection(int size);

	protected abstract void addToCollection(T collection, Object collectionRow);

	@Override
	public T initialize() {
		final SharedSessionContractImplementor session = versionsReader.getSessionImplementor();
		final List collectionContent = queryGenerator.getQuery( session, primaryKey, revision, removed ).list();

		final T collection = initializeCollection( collectionContent.size() );

		for ( Object collectionRow : collectionContent ) {
			addToCollection( collection, collectionRow );
		}

		return collection;
	}
}