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Core of the Object/Lucene mapper, query engine and index management

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/*
 * Hibernate Search, full-text search for your domain model
 *
 * 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.search.engine.impl;

import java.io.Serializable;
import java.util.HashSet;
import java.util.Properties;
import java.util.Set;

import org.apache.lucene.document.Document;
import org.hibernate.search.filter.FullTextFilterImplementor;
import org.hibernate.search.indexes.impl.IndexManagerHolder;
import org.hibernate.search.indexes.spi.IndexManager;
import org.hibernate.search.store.IndexShardingStrategy;
import org.hibernate.search.store.ShardIdentifierProvider;

/**
 * @author Hardy Ferentschik
 * @author Emmanuel Bernard
 */
class DynamicShardingStrategy implements IndexShardingStrategy {
	private final ShardIdentifierProvider shardIdentifierProvider;
	private final IndexManagerHolder indexManagerHolder;
	private final String rootIndexName;
	private final DynamicShardingEntityIndexBinding entityIndexBinding;

	DynamicShardingStrategy(ShardIdentifierProvider shardIdentifierProvider,
			IndexManagerHolder indexManagerHolder,
			DynamicShardingEntityIndexBinding entityIndexBinding,
			String rootIndexName) {
		this.shardIdentifierProvider = shardIdentifierProvider;
		this.indexManagerHolder = indexManagerHolder;
		this.entityIndexBinding = entityIndexBinding;
		this.rootIndexName = rootIndexName;
	}

	@Override
	public void initialize(Properties properties, IndexManager[] indexManagers) {
	}

	@Override
	public IndexManager[] getIndexManagersForAllShards() {
		Set allShardIdentifiers = shardIdentifierProvider.getAllShardIdentifiers();
		return getIndexManagersFromShards( allShardIdentifiers );
	}

	@Override
	public IndexManager getIndexManagerForAddition(Class entity, Serializable id, String idInString, Document document) {
		String shardIdentifier = shardIdentifierProvider.getShardIdentifier( entity, id, idInString, document );
		return indexManagerHolder.getOrCreateIndexManager(
				rootIndexName,
				shardIdentifier,
				entityIndexBinding
		);
	}

	@Override
	public IndexManager[] getIndexManagersForDeletion(Class entity, Serializable id, String idInString) {
		Set shardIdentifiers = shardIdentifierProvider.getShardIdentifiersForDeletion( entity, id, idInString );
		return getIndexManagersFromShards( shardIdentifiers );
	}

	@Override
	public IndexManager[] getIndexManagersForQuery(FullTextFilterImplementor[] fullTextFilters) {
		Set shards = shardIdentifierProvider.getShardIdentifiersForQuery( fullTextFilters );
		return getIndexManagersFromShards( shards );
	}

	ShardIdentifierProvider getShardIdentifierProvider() {
		return shardIdentifierProvider;
	}

	private IndexManager[] getIndexManagersFromShards(Set shardIdentifiers) {
		Set managers = new HashSet( shardIdentifiers.size() );
		for ( String shardIdentifier : shardIdentifiers ) {
			managers.add(
					indexManagerHolder.getOrCreateIndexManager(
							rootIndexName,
							shardIdentifier,
							entityIndexBinding
					)
			);
		}
		return managers.toArray( new IndexManager[shardIdentifiers.size()] );
	}
}