/*
 * 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.flink.api.common.typeutils.base.array;

import static java.lang.Math.min;

import org.apache.flink.annotation.Internal;
import org.apache.flink.api.common.typeutils.TypeComparator;
import org.apache.flink.api.common.typeutils.base.DoubleComparator;

@Internal
public class DoublePrimitiveArrayComparator extends PrimitiveArrayComparator<double[], DoubleComparator> {
	public DoublePrimitiveArrayComparator(boolean ascending) {
		super(ascending, new DoubleComparator(ascending));
	}

	@Override
	public int hash(double[] record) {
		int result = 0;
		for (double field : record) {
			long bits = Double.doubleToLongBits(field);
			result += (int) (bits ^ (bits >>> 32));
		}
		return result;
	}

	@Override
	public int compare(double[] first, double[] second) {
		for (int x = 0; x < min(first.length, second.length); x++) {
			int cmp = Double.compare(first[x], second[x]);
			if (cmp != 0) {
				return ascending ? cmp : -cmp;
			}
		}
		int cmp = first.length - second.length;
		return ascending ? cmp : -cmp;
	}

	@Override
	public TypeComparator<double[]> duplicate() {
		DoublePrimitiveArrayComparator dupe = new DoublePrimitiveArrayComparator(this.ascending);
		dupe.setReference(this.reference);
		return dupe;
	}
}