Rounding.java

/*
 * Copyright 2016 The Simple File Server Authors
 *
 * 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 org.sfs.math;


import com.google.common.math.LongMath;

public class Rounding {

    public static long up(long num, int factor) {
        if (num <= factor) {
            return factor;
        } else if (num % factor == 0) {
            return num;
        } else {
            return LongMath.checkedAdd(num / factor * factor, factor);
        }
    }

    public static long down(long num, int factor) {
        if (num < factor) {
            return 0;
        } else if (num % factor == 0) {
            return num;
        } else {
            return num / factor * factor;
        }
    }

}