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Provides seamlessly integrated Java access to graph databases (Neo4J) at different levels of abstraction.
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/************************************************************************
 * Copyright (c) 2014-2016 IoT-Solutions e.U.
 * 
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * 
 *  http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 ************************************************************************/

package iot.jcypher.database.embedded;

import iot.jcypher.database.DBProperties;
import iot.jcypher.database.DBType;

import java.io.File;
import java.util.Properties;

import org.neo4j.graphdb.GraphDatabaseService;
import org.neo4j.graphdb.factory.GraphDatabaseBuilder;
import org.neo4j.graphdb.factory.GraphDatabaseFactory;
import org.neo4j.graphdb.factory.GraphDatabaseSettings;

public class EmbeddedDBAccess extends AbstractEmbeddedDBAccess {

	public EmbeddedDBAccess() {
		super();
	}
	
	public EmbeddedDBAccess(GraphDatabaseService gdbs) {
		super(gdbs);
	}

	@Override
	public void initialize(Properties properties) {
		this.properties = properties;
		if (this.properties.getProperty(DBProperties.DATABASE_DIR) == null)
			throw new RuntimeException("missing property: '"
					+ DBProperties.DATABASE_DIR + "' in database configuration");
	}

	@Override
	public DBType getDBType() {
		return DBType.EMBEDDED;
	}

	@Override
	protected GraphDatabaseService createGraphDB() {
		// TODO the following applies to version 2.3.0 and above
//		File dbDir = new File(this.properties
//						.getProperty(DBProperties.DATABASE_DIR));
//		GraphDatabaseBuilder builder = new GraphDatabaseFactory()
//				.newEmbeddedDatabaseBuilder(dbDir);
		
		GraphDatabaseBuilder builder = new GraphDatabaseFactory()
				.newEmbeddedDatabaseBuilder(new File(this.properties
						.getProperty(DBProperties.DATABASE_DIR)));
		if (this.properties
				.getProperty(DBProperties.PAGECACHE_MEMORY) != null)
			builder.setConfig(
					GraphDatabaseSettings.pagecache_memory,
					DBProperties.PAGECACHE_MEMORY);
		if (this.properties.getProperty(DBProperties.STRING_BLOCK_SIZE) != null)
			builder.setConfig(GraphDatabaseSettings.string_block_size,
					DBProperties.ARRAY_BLOCK_SIZE);
		if (this.properties.getProperty(DBProperties.STRING_BLOCK_SIZE) != null)
			builder.setConfig(GraphDatabaseSettings.array_block_size,
					DBProperties.ARRAY_BLOCK_SIZE);
		
//		builder.setConfig(GraphDatabaseSettings.cypher_planner, "RULE");
		
		return builder.newGraphDatabase();
	}
}