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    • com.github.tomakehurst.wiremock.extension.responsetemplating.helpers.MathsHelper Maven / Gradle / Ivy

    /*
 * Copyright (C) 2011 Thomas Akehurst
 *
 * 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 com.github.tomakehurst.wiremock.extension.responsetemplating.helpers;

import com.github.jknack.handlebars.Options;

import java.io.IOException;
import java.math.BigDecimal;
import java.math.RoundingMode;

public class MathsHelper extends HandlebarsHelper {

    @Override
    public Object apply(Object context, Options options) throws IOException {
        if (options.params.length != 2) {
            return handleError("All maths functions require two operands and an operator as parameters e.g. 3 '+' 2");
        }

        BigDecimal left = coerceToBigDecimal(context);
        String operator = options.params[0].toString();
        BigDecimal right = coerceToBigDecimal(options.params[1]);

        BigDecimal result = null;
        switch (operator) {
            case "+":
                result = left.add(right);
                break;
            case "-":
                result = left.subtract(right);
                break;
            case "*":
            case "x":
                result = left.multiply(right);
                break;
            case "/":
                result = left.divide(right, RoundingMode.HALF_UP);
                break;
            case "%":
                result = left.remainder(right);
                break;
            default:
                return handleError(operator + " is not a valid mathematical operator");
        }

        return reduceToPrimitiveNumber(result);
    }

    private static BigDecimal coerceToBigDecimal(Object value) {
        if (value instanceof Integer) {
            return new BigDecimal((int) value);
        }

        if (value instanceof Long) {
            return new BigDecimal((long) value);
        }

        if (value instanceof Double) {
            return BigDecimal.valueOf((double) value);
        }

        if (value instanceof Float) {
            return BigDecimal.valueOf((float) value);
        }

        if (value instanceof CharSequence) {
            return new BigDecimal(value.toString());
        }

        return new BigDecimal(0);
    }

    private static Object reduceToPrimitiveNumber(BigDecimal value) {
        if (value == null) {
            return null;
        }

        if (value.scale() == 0) {
            if (value.longValue() <= Integer.MAX_VALUE) {
                return value.intValue();
            }

            return value.longValue();
        }

        return value.doubleValue();
    }
}
    
    
    
    

    




    
    
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