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/*
 *    GeoTools - The Open Source Java GIS Toolkit
 *    http://geotools.org
 *
 *    (C) 2011, Open Source Geospatial Foundation (OSGeo)
 *    (C) 2003-2005, Open Geospatial Consortium Inc.
 *
 *    All Rights Reserved. http://www.opengis.org/legal/
 */
package org.opengis.util;

import static org.opengis.annotation.Obligation.*;
import static org.opengis.annotation.Specification.*;

import org.opengis.annotation.UML;

/**
 * An {@linkplain Integer integer} with associated infinite flag. This implementation uses {@link
 * Integer#MAX_VALUE} as a sentinel value for positive infinity. This approach is consistent with
 * J2SE {@link java.util.Collection#size()} contract. For consistency, {@link Integer#MIN_VALUE} is
 * a sentinal value for negative infinity.
 *
 * @author Jody Garnett (Refractions Research)
 * @author Martin Desruisseaux (IRD)
 * @since GeoAPI 2.1
 */
@UML(identifier = "UnlimitedInteger", specification = ISO_19103)
public final class UnlimitedInteger extends Number implements Comparable {
    /** For compatibility with different versions. */
    private static final long serialVersionUID = 4748246369364771836L;

    /** A constant holding the negative infinity. */
    public static final UnlimitedInteger NEGATIVE_INFINITY =
            new UnlimitedInteger(Integer.MIN_VALUE);

    /** A constant holding the positive infinity. */
    public static final UnlimitedInteger POSITIVE_INFINITY =
            new UnlimitedInteger(Integer.MAX_VALUE);

    /** A constant holding the minimum finite value a {@code UnlimitedInteger} can have. */
    public static final int MIN_VALUE = Integer.MIN_VALUE + 1;

    /** A constant holding the maximum finite value a {@code UnlimitedInteger} can have. */
    public static final int MAX_VALUE = Integer.MAX_VALUE - 1;

    /** The integer value. */
    private final int value;

    /**
     * Constructs a newly allocated {@code UnlimitedInteger} object that represents the specified
     * {@code int} value. {@link Integer#MAX_VALUE} and {@link Integer#MIN_VALUE MIN_VALUE} maps to
     * positive and negative infinities respectively.
     */
    public UnlimitedInteger(final int value) {
        this.value = value;
    }

    /** Returns {@code true} if this integer represents a positive or negative infinity. */
    public boolean isInfinite() {
        return (value == Integer.MAX_VALUE) || (value == Integer.MIN_VALUE);
    }

    /**
     * Returns the value of this {@code UnlimitedInteger} as an {@code int}. Positive and negative
     * infinities map to {@link Integer#MAX_VALUE} and {@link Integer#MIN_VALUE MIN_VALUE}
     * respectively.
     */
    @Override
    public int intValue() {
        return value;
    }

    /**
     * Returns the value of this {@code UnlimitedInteger} as a {@code long}. Positive and negative
     * infinities map to {@link Long#MAX_VALUE} and {@link Long#MIN_VALUE MIN_VALUE} respectively.
     */
    @Override
    public long longValue() {
        return value;
    }

    /**
     * Returns the value of this {@code UnlimitedInteger} as a {@code float}. Positive and negative
     * infinities map to {@link Float#POSITIVE_INFINITY} and {@link Float#NEGATIVE_INFINITY
     * NEGATIVE_INFINITY} respectively.
     */
    @Override
    public float floatValue() {
        switch (value) {
            case Integer.MAX_VALUE:
                return Float.POSITIVE_INFINITY;
            case Integer.MIN_VALUE:
                return Float.NEGATIVE_INFINITY;
            default:
                return value;
        }
    }

    /**
     * Returns the value of this {@code UnlimitedInteger} as a {@code double}. Positive and negative
     * infinities map to {@link Double#POSITIVE_INFINITY} and {@link Double#NEGATIVE_INFINITY
     * NEGATIVE_INFINITY} respectively.
     */
    @Override
    public double doubleValue() {
        switch (value) {
            case Integer.MAX_VALUE:
                return Double.POSITIVE_INFINITY;
            case Integer.MIN_VALUE:
                return Double.NEGATIVE_INFINITY;
            default:
                return value;
        }
    }

    /** Returns a string representation of this number. */
    @Override
    public String toString() {
        switch (value) {
            case Integer.MAX_VALUE:
                return "\u221E"; // Infinity symbol.
            case Integer.MIN_VALUE:
                return "-\u221E";
            default:
                return Integer.toString(value);
        }
    }

    /** Returns a hash code for this integer. */
    @Override
    public int hashCode() {
        return value;
    }

    /** Compares this number with the specified object for equality. */
    @Override
    public boolean equals(final Object object) {
        return (object instanceof UnlimitedInteger) && ((UnlimitedInteger) object).value == value;
    }

    /**
     * Compares two {@code UnlimitedInteger} objects numerically.
     *
     * @param other the unlimited integer to be compared.
     * @return {@code 0} if this {@code UnlimitedInteger} is equal to the given value, {@code -1} if
     *     this {@code UnlimitedInteger} is numerically less than the given value, and {@code +1} if
     *     this {@code UnlimitedInteger} is numerically greater than the given value,
     */
    public int compareTo(final UnlimitedInteger other) {
        if (value < other.value) return -1;
        if (value > other.value) return +1;
        return 0;
    }
}