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JSR 354 provides an API for representing, transporting, and performing comprehensive calculations with Money and Currency. This module implements JSR 354.
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/*
 * Copyright (c) 2012, 2014, Credit Suisse (Anatole Tresch), Werner Keil and others by the @author tag.
 *
 * 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.javamoney.moneta.spi;

import java.math.BigDecimal;
import java.math.BigInteger;
import java.util.Arrays;
import java.util.List;
import java.util.Objects;
import java.util.concurrent.atomic.AtomicInteger;
import java.util.concurrent.atomic.AtomicLong;

import javax.money.NumberValue;

/**
 * This enumeration provides general utility functions supporting conversion of number types to BigDecimal.
 */
public enum ConvertBigDecimal {
    /** Conversion from integral numeric types, short, int, long. */
	INTEGER {
		@Override
		BigDecimal getDecimal(Number num) {
			return BigDecimal.valueOf(num.longValue());
		}
	},
    /** Conversion for floating point numbers. */
    FLUCTUAGE {
		@Override
		BigDecimal getDecimal(Number num) {
            double d = num.doubleValue();
            if (Double.isNaN(d)|| Double.isInfinite(d)) {
                throw new ArithmeticException("NaN, POSITIVE_INFINITY and NEGATIVE_INFINITY cannot be used as " +
                        "parameters for monetary operations.");
            }
            return new BigDecimal(num.toString());
        }
	},
    /** Conversion from BigInteger. */
    BIGINTEGER {
		@Override
		BigDecimal getDecimal(Number num) {
			return new BigDecimal((BigInteger) num);
		}
	},
    /** Conversion from NumberValue. */
    NUMBERVALUE {
		@Override
		BigDecimal getDecimal(Number num) {
			BigDecimal result = ((NumberValue)num).numberValue(BigDecimal.class);
			return isScaleZero(result);
		}
	},
    /** Conversion from BigDecimal. */
    BIGDECIMAL {
		@Override
		BigDecimal getDecimal(Number num) {
			BigDecimal result = ((BigDecimal)num);
			return isScaleZero(result);
		}
	},
    /** COnversion from BigDecimal, extended. */
    BIGDECIMAL_EXTENDS {
		@Override
		BigDecimal getDecimal(Number num) {
			BigDecimal result = ((BigDecimal)num).stripTrailingZeros();
			return isScaleZero(result);
		}
	},
    /** Default conversion based on String, if everything else failed. */
	DEFAULT {
		@Override
		BigDecimal getDecimal(Number num) {
			BigDecimal result = null;
			try {
				result = new BigDecimal(num.toString());
			} catch (NumberFormatException ignored) {
			}
			if(result==null){
                result = BigDecimal.valueOf(num.doubleValue());
            }
			return isScaleZero(result);
		}
	};
	
	
	abstract BigDecimal getDecimal(Number num);
	
	static BigDecimal of(Number num) {
		Objects.requireNonNull(num, "Number is required.");
		return factory(num).getDecimal(num);
	}

	private static ConvertBigDecimal factory(Number num) {
		if (INSTEGERS.contains(num.getClass())) {
			return INTEGER;
		}
		if (FLOATINGS.contains(num.getClass())) {
			return FLUCTUAGE;
		}
		if (num instanceof NumberValue) {
			return NUMBERVALUE;
		}
		if (BigDecimal.class.equals(num.getClass())) {
			return BIGDECIMAL;
		}
        if (num instanceof BigInteger) {
            return BIGINTEGER;
        }
		if (num instanceof BigDecimal) {
			return BIGDECIMAL_EXTENDS;
		}
		return DEFAULT;
	}

    private static final List FLOATINGS = Arrays.asList(
            (Class)Float.class, Double.class);

	private static final List INSTEGERS = Arrays.asList(
            (Class)Long.class, Integer.class, Short.class, Byte.class,
			AtomicLong.class, AtomicInteger.class);

	private static BigDecimal isScaleZero(BigDecimal result) {
		if (result.signum() == 0) {
			return BigDecimal.ZERO;
		}
		if (result.scale() > 0) {
			return result.stripTrailingZeros();
		}
		return result;
	}
}