/*

 * Copyright (c) 2001, Oracle and/or its affiliates. All rights reserved.

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

 * This code is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 only, as

 * published by the Free Software Foundation.

 *

 * This code is distributed in the hope that it will be useful, but WITHOUT

 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

 * version 2 for more details (a copy is included in the LICENSE file that

 * accompanied this code).

 *

 * You should have received a copy of the GNU General Public License version

 * 2 along with this work; if not, write to the Free Software Foundation,

 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

 *

 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

 * or visit www.oracle.com if you need additional information or have any

 * questions.

 */

/*

 * @test

 * @bug 4428772

 * @summary Testing recognition of "NaN" and "Infinity" strings

 * @author Joseph D. Darcy

 */

public class NaNInfinityParsing {

    /*

     * Regression tests for:

     * 4428772 -- Establish invariant for Float & Double classes and

     * their string representations

     *

     * Added capability for parse{Float, Double} and related methods

     * to recognize "NaN" and "Infinity" strings so that

     * parseDouble(toString(d)) will always return the original

     * floating-point value.

     */

    static String NaNStrings[] = {

        "NaN",

        "+NaN",

        "-NaN"

    };

    static String infinityStrings[] = {

        "Infinity",

        "+Infinity",

        "-Infinity",

    };

    static String invalidStrings[] = {

        "+",

        "-",

        "@",

        "N",

        "Na",

        "Nan",

        "NaNf",

        "NaNd",

        "NaNF",

        "NaND",

        "+N",

        "+Na",

        "+Nan",

        "+NaNf",

        "+NaNd",

        "+NaNF",

        "+NaND",

        "-N",

        "-Na",

        "-Nan",

        "-NaNf",

        "-NaNd",

        "-NaNF",

        "-NaND",

        "I",

        "In",

        "Inf",

        "Infi",

        "Infin",

        "Infini",

        "Infinit",

        "InfinitY",

        "Infinityf",

        "InfinityF",

        "Infinityd",

        "InfinityD",

        "+I",

        "+In",

        "+Inf",

        "+Infi",

        "+Infin",

        "+Infini",

        "+Infinit",

        "+InfinitY",

        "+Infinityf",

        "+InfinityF",

        "+Infinityd",

        "+InfinityD",

        "-I",

        "-In",

        "-Inf",

        "-Infi",

        "-Infin",

        "-Infini",

        "-Infinit",

        "-InfinitY",

        "-Infinityf",

        "-InfinityF",

        "-Infinityd",

        "-InfinityD",

        "NaNInfinity",

        "InfinityNaN",

        "nan",

        "infinity"

    };

    public static void main(String [] argv) throws Exception {

        int i;

        double d;

        // Test valid NaN strings

        for(i = 0; i < NaNStrings.length; i++) {

            if(!Double.isNaN(d=Double.parseDouble(NaNStrings[i]))) {

                throw new RuntimeException("NaN string ``" + NaNStrings[i]

                                           + "'' did not parse as a NaN; returned " +

                                           d + " instead.");

            }

        }

        // Test valid Infinity strings

        for(i = 0; i < infinityStrings.length; i++) {

            if(!Double.isInfinite(d=Double.parseDouble(infinityStrings[i]))) {

                throw new RuntimeException("Infinity string ``" +

                                           infinityStrings[i] +

                                           "'' did not parse as infinity; returned " +

                                           d + "instead.");

            }

            // check sign of result

            boolean negative = (infinityStrings[i].charAt(0) == '-');

            if(d != (negative?Double.NEGATIVE_INFINITY:

                          Double.POSITIVE_INFINITY))

                throw new RuntimeException("Infinity has wrong sign;" +

                                           (negative?"positive instead of negative.":

                                            "negative instead of positive."));

        }

        // Test almost valid strings

        for(i = 0; i < invalidStrings.length; i++) {

            try {

                double result;

                d = Double.parseDouble(invalidStrings[i]);

                throw new RuntimeException("Invalid string ``" +

                                           invalidStrings[i]

                                           +"'' parsed as " + d + ".");

            }

            catch(NumberFormatException e) {

                // expected

            }

        }

    }

}