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Declarative Machine Learning

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/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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 org.apache.sysml.udf.lib;

//import org.apache.sysml.packagesupport.Scalar;
//import org.apache.sysml.packagesupport.FIO;

import org.apache.sysml.udf.FunctionParameter;
import org.apache.sysml.udf.PackageFunction;
import org.apache.sysml.udf.PackageRuntimeException;
import org.apache.sysml.udf.Scalar;
import org.apache.sysml.udf.Scalar.ScalarValueType;

/**
 * Wrapper class for time invocation
 * 
 * time = externalFunction(Integer i) return (Double B) implemented in
 * (classname="org.apache.sysml.udf.lib.TimeWrapper",exectype="mem");
 * 
 * t = time (1);
 * 
 * print( "Time in millsecs= " + t);
 * 
 */
public class TimeWrapper extends PackageFunction 
{
	
	private static final long serialVersionUID = 1L;

	private Scalar _ret;

	@Override
	public int getNumFunctionOutputs() {
		return 1;
	}

	@Override
	public FunctionParameter getFunctionOutput(int pos) {
		if (pos == 0)
			return _ret;

		throw new PackageRuntimeException(
				"Invalid function output being requested");
	}

	@Override
	public void execute() {
		try {
			// int past = Integer.parseInt(((Scalar) getFunctionInput(0))
			// .getValue());
			long present = System.currentTimeMillis();
			_ret = new Scalar(ScalarValueType.Double, String.valueOf(present));
		} catch (Exception e) {
			throw new PackageRuntimeException(
					"Error executing external time function", e);
		}
	}

}