io.vertx.sqlclient.data.Numeric.java Source code

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Here is the source code for io.vertx.sqlclient.data.Numeric.java

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/*
 * Copyright (C) 2018 Julien Viet
 *
 * 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 io.vertx.sqlclient.data;

import java.math.BigDecimal;
import java.math.BigInteger;

/**
 * The Postgres <i>NUMERIC</i> type.
 */
public final class Numeric extends Number {

    /**
     * Constant for the {@code NaN} value.
     */
    public static final Numeric NaN = new Numeric(Double.NaN);

    private final Number value;

    /**
     * Return a {@code Numeric} instance for the given {@code number}.
     * <p/>
     * Null values or infinite {@code Double} or {@code Float} are rejected.
     *
     * @param number the number
     * @return the {@code Numeric} value
     * @throws NumberFormatException when the number is infinite
     */
    public static Numeric create(Number number) {
        if (number == null) {
            throw new NullPointerException();
        }
        if (number instanceof Double && ((Double) number).isInfinite()
                || number instanceof Float && ((Float) number).isInfinite()) {
            throw new NumberFormatException("Infinite numbers are not valid numerics");
        }
        return new Numeric(number);
    }

    /**
     * Parse and return a {@code Numeric} instance for the given {@code s}.
     * <p/>
     * The string {@code "Nan"} will return the {@link #NaN} instance.
     *
     * @param s the string
     * @return the {@code Numeric} value
     */
    public static Numeric parse(String s) {
        switch (s) {
        case "NaN":
            return NaN;
        default:
            return new Numeric(new BigDecimal(s));
        }
    }

    private Numeric(Number value) {
        this.value = value;
    }

    @Override
    public short shortValue() {
        return value.shortValue();
    }

    @Override
    public int intValue() {
        return value.intValue();
    }

    @Override
    public long longValue() {
        return value.longValue();
    }

    @Override
    public float floatValue() {
        return value.floatValue();
    }

    @Override
    public double doubleValue() {
        return value.doubleValue();
    }

    /**
     * @return {@code true} when this number represents {@code NaN}
     */
    public boolean isNaN() {
        return value instanceof Double && ((Double) value).isNaN()
                || value instanceof Float && ((Float) value).isNaN();
    }

    /**
     * @return  the numeric value represented by this object after conversion
     *          to type {@code BigDecimal}. It can be {@code null} when this instance
     *          represents the {@code NaN} value.
     */
    public BigDecimal bigDecimalValue() {
        if (value instanceof BigDecimal) {
            return (BigDecimal) value;
        } else if (value instanceof BigInteger) {
            return new BigDecimal((BigInteger) value);
        } else if (isNaN()) {
            return null;
        } else {
            return new BigDecimal(value.toString());
        }
    }

    /**
     * @return  the numeric value represented by this object after conversion
     *          to type {@code BigInteger}. It can be {@code null} when this instance
     *          represents the {@code NaN} value.
     */
    public BigInteger bigIntegerValue() {
        if (value instanceof BigInteger) {
            return (BigInteger) value;
        } else if (value instanceof BigDecimal) {
            return ((BigDecimal) value).toBigInteger();
        } else if (isNaN()) {
            return null;
        } else {
            return new BigInteger(Long.toString(value.longValue()));
        }
    }

    @Override
    public boolean equals(Object obj) {
        if (obj instanceof Numeric) {
            Numeric that = (Numeric) obj;
            if (value.getClass() == that.value.getClass()) {
                return value.equals(that.value);
            } else {
                BigDecimal l = bigDecimalValue();
                BigDecimal r = that.bigDecimalValue();
                if (l == null) {
                    return r == null;
                } else if (r == null) {
                    return false;
                }
                return l.compareTo(r) == 0;
            }
        }
        return false;
    }

    @Override
    public int hashCode() {
        return intValue();
    }

    @Override
    public String toString() {
        return value.toString();
    }
}