/*******************************************************************************
 * Copyright (c) 2004-2008 Andras Schmidt, Andras Balogh, Istvan Rath and Daniel Varro
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors:
 *    Andras Schmidt, Andras Balogh, Istvan Rath - initial API and implementation
 *******************************************************************************/

package org.eclipse.viatra2.natives;

import org.eclipse.viatra2.core.IModelSpace;
import org.eclipse.viatra2.errors.VPMRuntimeException;
import org.eclipse.viatra2.natives.NativeFunctionParameter.ParameterType;

/**
 * Native function to retrieve the current system time.
 * 
 * @author istvan
 * 
 */
@VIATRANativeFunction(name = "systime", remark = "Returns a truncated systime to fit into a 32-bit integer. First 4 digits are dropped.", params = {}, returns = { ParameterType.STRING })
public class SysTimeFunction implements ASMNativeFunction {

	public Object evaluate(IModelSpace msp, Object[] params)
			throws VPMRuntimeException {
		return new Integer(Long.toString(System.currentTimeMillis()).substring(
				4));
	}

	public String getDescription() {
		return "The current system time in milliseconds (with first 4 digits dropped).";
	}

	public String getID() {
		return this.getClass().getCanonicalName();
	}

	public String getName() {
		return "systime"; // ez megy a VTCLbe
	}

}