LiteralManager.java

/*
 * Copyright Aduna (http://www.aduna-software.com/) (c) 2008.
 *
 * Licensed under the Aduna BSD-style license.
 */
package org.openrdf.sail.rdbms.managers;

import java.sql.SQLException;
import java.util.Locale;
import java.util.TimeZone;

import javax.xml.datatype.XMLGregorianCalendar;

import org.openrdf.model.Literal;
import org.openrdf.model.URI;
import org.openrdf.model.datatypes.XMLDatatypeUtil;
import org.openrdf.sail.rdbms.managers.base.ValueManagerBase;
import org.openrdf.sail.rdbms.model.RdbmsLiteral;
import org.openrdf.sail.rdbms.model.RdbmsURI;
import org.openrdf.sail.rdbms.schema.LiteralTable;

/**
 * Manages RDBMS Literals. Including creation, id lookup, and inserting them
 * into the database.
 * 
 * @author James Leigh
 * 
 */
public class LiteralManager extends ValueManagerBase<RdbmsLiteral> {

	private static TimeZone Z = TimeZone.getTimeZone("GMT");

	public static long getCalendarValue(XMLGregorianCalendar xcal) {
		return xcal.toGregorianCalendar(Z, Locale.US, null).getTimeInMillis();
	}

	public static LiteralManager instance;

	private LiteralTable table;

	public LiteralManager() {
		instance = this;
	}

	public void setTable(LiteralTable table) {
		this.table = table;
	}

	@Override
	public void close()
		throws SQLException
	{
		super.close();
		table.close();
	}

	@Override
	protected boolean expunge(String condition)
		throws SQLException
	{
		return table.expunge(condition);
	}

	@Override
	protected void optimize()
		throws SQLException
	{
		super.optimize();
		table.optimize();
	}

	@Override
	protected Literal key(RdbmsLiteral value) {
		return value;
	}

	@Override
	protected void insert(Number id, RdbmsLiteral literal)
		throws SQLException, InterruptedException
	{
		String label = literal.getLabel();
		String language = literal.getLanguage();
		URI datatype = literal.getDatatype();
		if (literal.getPredicate() != null 
				&& literal.getPredicate().stringValue().equals("http://www.georss.org/georss/point")) {
			/*
			 * Insert point using reverse parameter order:
			 * GeoRss uses latitude<space>longitude format, whereas POINT datatype
			 * expects x<space>y format, which equals to longitude<space>latitude
			 */
			String[] point = literal.stringValue().split(" ");
			table.insertPoint(id, label, point[1] + " " + point[0]);
		}			
		else if (datatype == null && language == null) {
			table.insertSimple(id, label);
		}
		else if (datatype == null) {
			table.insertLanguage(id, label, language);
		}
		else {
			String dt = datatype.stringValue();
			try {
				if (XMLDatatypeUtil.isNumericDatatype(datatype)) {
					table.insertNumeric(id, label, dt, literal.doubleValue());
				}
				else if (XMLDatatypeUtil.isCalendarDatatype(datatype)) {
					long value = getCalendarValue(literal.calendarValue());
					table.insertDateTime(id, label, dt, value);
				}
				else {
					table.insertDatatype(id, label, dt);
				}
			}
			catch (NumberFormatException e) {
				table.insertDatatype(id, label, dt);
			}
			catch (IllegalArgumentException e) {
				table.insertDatatype(id, label, dt);
			}
		}
	}

	@Override
	protected int getBatchSize() {
		return table.getBatchSize();
	}
}