Java BigDecimal to convertRating(BigDecimal rating)

Description

convert Rating

License

Apache License

Parameter

Parameter	Description
rating	a parameter

Return

converted value

Declaration

public static BigDecimal convertRating(BigDecimal rating) 

Method Source Code

//package com.java2s;
/*******************************************************************************
 * Copyright 2015 MobileMan GmbH//from ww  w  . ja  v  a2s  . c  o m
 * www.mobileman.com
 * 
 * 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.
 ******************************************************************************/

import java.math.BigDecimal;

public class Main {
    /**
     * @param rating
     * @return converted value
     */
    public static BigDecimal convertRating(BigDecimal rating) {
        if (rating == null) {
            return null;
        }

        //0 -> 5
        //0.25 -> 4
        //0.5 -> 3
        //0.75 -> 2
        //1 -> 1
        int decimalPlaces = 2;
        int r = 1;
        for (int i = 0; i < decimalPlaces; i++) {
            r *= 10;
        }

        return BigDecimal.valueOf(Math.round((5 + rating.doubleValue()
                * (-4))
                * r)
                / r);
    }
}

Related

1. convertDoubleToBigDecimal(final Double score, final int decimalPlaces)
2. convertFeetToInches(BigDecimal feet)
3. convertHoursToMillis(BigDecimal hours)
4. convertNullToBigDecimal(Object orgStr)
5. convertRadiansToDegrees(BigDecimal radians)
6. convertSecondsToMillis(BigDecimal seconds)
7. convertStringToBigDecimal(String strValue)
8. convertToBigDecimal(final Object o)
9. convertToBigDecimal(Object sourceValue)