/*
 * 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.sysds.runtime.matrix.data.sketch;

import org.apache.commons.lang3.NotImplementedException;
import org.apache.sysds.runtime.matrix.data.sketch.countdistinct.CountDistinctFunctionSketch;
import org.apache.sysds.runtime.matrix.data.sketch.countdistinctapprox.KMVSketch;
import org.apache.sysds.runtime.matrix.operators.CountDistinctOperator;
import org.apache.sysds.runtime.matrix.operators.CountDistinctOperatorTypes;
import org.apache.sysds.runtime.matrix.operators.Operator;

public class MatrixSketchFactory {
	public static MatrixSketch get(Operator op) {
		if (op instanceof CountDistinctOperator) {
			CountDistinctOperator cdop = (CountDistinctOperator) op;
			if (cdop.getOperatorType() == CountDistinctOperatorTypes.COUNT) {
				return new CountDistinctFunctionSketch(op);
			} else if (cdop.getOperatorType() == CountDistinctOperatorTypes.KMV) {
				return new KMVSketch(op);
			} else {
				throw new NotImplementedException("Only COUNT and KMV count distinct sketches are supported for now");
			}
		} else {
			throw new IllegalArgumentException("Only sketches for count distinct operators are supported for now");
		}
	}
}
