RoundingHandler.java

/*
 * Copyright (C) 2016 Patrick Favre-Bulle
 *
 * Licensed 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 at.favre.tools.dconvert.arg;

/**
 * Defines how float numbers will be rounded
 */
public class RoundingHandler {
	public enum Strategy {
		ROUND_HALF_UP,
		CEIL,
		FLOOR
	}

	private final Strategy strategy;

	public RoundingHandler(Strategy strategy) {
		this.strategy = strategy;
	}

	public long round(double value) {
		switch (strategy) {
			default:
			case ROUND_HALF_UP:
				return Math.max(1, Math.round(value));
			case CEIL:
				return Math.max(1, (long) Math.ceil(value));
			case FLOOR:
				return Math.max(1, (long) Math.floor(value));
		}
	}
}