org.eclipse.viatra2.core2/src/org/eclipse/viatra2/natives/RandomDoubleFunction.java

/*******************************************************************************
 * 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:
 *    Gabor Bergmann, Istvan Rath - initial API and implementation
 *******************************************************************************/

package org.eclipse.viatra2.natives;

import java.util.Random;

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

/**
 * Native function to generate a fresh random number.
 * 
 * @author Gabor Bergmann
 * 
 */
@VIATRANativeFunction(name = "randomDouble", remark = "Returns a fresh random number between 0.0 and 1.0.", params = {}, returns = { ParameterType.DOUBLE })
public class RandomDoubleFunction implements ASMNativeFunction {

	Random random = new Random();
	
	public Object evaluate(IModelSpace msp, Object[] params)
			throws VPMRuntimeException {
		return random.nextDouble();
	}

	public String getDescription() {
		return "Returns a fresh random number between 0.0 and 1.0.";
	}

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

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

}