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package prerna.engine.impl.owl;

import java.util.concurrent.Semaphore;

import prerna.engine.api.IDatabaseEngine;
import prerna.engine.impl.rdf.RDFFileSesameEngine;

public class OWLEngineFactory {
	
    private final Semaphore writeSemaphore = new Semaphore(1);
	
	private RDFFileSesameEngine baseDataEngine = null;
	private IDatabaseEngine.DATABASE_TYPE dbType = IDatabaseEngine.DATABASE_TYPE.RDBMS;
	private String engineId = null;
	private String engineName = null;
	
	private ReadOnlyOWLEngine reader = null;
	private WriteOWLEngine writer = null;
	
	public OWLEngineFactory(RDFFileSesameEngine baseDataEngine, 
			IDatabaseEngine.DATABASE_TYPE dbType, 
			String engineId, 
			String engineName) {
		this.baseDataEngine = baseDataEngine;
		this.dbType = dbType;
		this.engineId = engineId;
		this.engineName = engineName;
		
		this.reader = new ReadOnlyOWLEngine(this.baseDataEngine, 
				this.engineId, 
				this.engineName);
		this.writer = new WriteOWLEngine(this.writeSemaphore, 
				this.baseDataEngine, 
				this.dbType, 
				this.engineId, 
				this.engineName);
	}
	
	/**
	 * 
	 * @return
	 */
	public ReadOnlyOWLEngine getReadOWL() {
		return this.reader;
	}

	/**
	 * Provides a construct to allow writes to the OWL
	 * Must close the WriteOWLEngine to release the lock
	 * @return
	 * @throws InterruptedException
	 */
	public WriteOWLEngine getWriteOWL() throws InterruptedException {
		this.writeSemaphore.acquire();
		return this.writer;
	}

}