/*

 * Copyright (c) 2010, 2012, 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.  Oracle designates this

 * particular file as subject to the "Classpath" exception as provided

 * by Oracle in the LICENSE file that accompanied this code.

 *

 * 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.

 */

/*

 *******************************************************************************

 * Copyright (C) 2009, International Business Machines Corporation and         *

 * others. All Rights Reserved.                                                *

 *******************************************************************************

 */

package sun.util.locale;

import java.util.List;

import java.util.Map;

import java.util.Set;

/**

 * Collection of static utility methods for Locale support. The

 * methods which manipulate characters or strings support ASCII only.

 */

public final class LocaleUtils {

    private LocaleUtils() {

    }

    /**

     * Compares two ASCII Strings s1 and s2, ignoring case.

     */

    public static boolean caseIgnoreMatch(String s1, String s2) {

        if (s1 == s2) {

            return true;

        }

        int len = s1.length();

        if (len != s2.length()) {

            return false;

        }

        for (int i = 0; i < len; i++) {

            char c1 = s1.charAt(i);

            char c2 = s2.charAt(i);

            if (c1 != c2 && toLower(c1) != toLower(c2)) {

                return false;

            }

        }

        return true;

    }

    static int caseIgnoreCompare(String s1, String s2) {

        if (s1 == s2) {

            return 0;

        }

        return toLowerString(s1).compareTo(toLowerString(s2));

    }

    static char toUpper(char c) {

        return isLower(c) ? (char)(c - 0x20) : c;

    }

    static char toLower(char c) {

        return isUpper(c) ? (char)(c + 0x20) : c;

    }

    /**

     * Converts the given ASCII String to lower-case.

     */

    public static String toLowerString(String s) {

        int len = s.length();

        int idx = 0;

        for (; idx < len; idx++) {

            if (isUpper(s.charAt(idx))) {

                break;

            }

        }

        if (idx == len) {

            return s;

        }

        char[] buf = new char[len];

        for (int i = 0; i < len; i++) {

            char c = s.charAt(i);

            buf[i] = (i < idx) ? c : toLower(c);

        }

        return new String(buf);

    }

    static String toUpperString(String s) {

        int len = s.length();

        int idx = 0;

        for (; idx < len; idx++) {

            if (isLower(s.charAt(idx))) {

                break;

            }

        }

        if (idx == len) {

            return s;

        }

        char[] buf = new char[len];

        for (int i = 0; i < len; i++) {

            char c = s.charAt(i);

            buf[i] = (i < idx) ? c : toUpper(c);

        }

        return new String(buf);

    }

    static String toTitleString(String s) {

        int len;

        if ((len = s.length()) == 0) {

            return s;

        }

        int idx = 0;

        if (!isLower(s.charAt(idx))) {

            for (idx = 1; idx < len; idx++) {

                if (isUpper(s.charAt(idx))) {

                    break;

                }

            }

        }

        if (idx == len) {

            return s;

        }

        char[] buf = new char[len];

        for (int i = 0; i < len; i++) {

            char c = s.charAt(i);

            if (i == 0 && idx == 0) {

                buf[i] = toUpper(c);

            } else if (i < idx) {

                buf[i] = c;

            } else {

                buf[i] = toLower(c);

            }

        }

        return new String(buf);

    }

    private static boolean isUpper(char c) {

        return c >= 'A' && c <= 'Z';

    }

    private static boolean isLower(char c) {

        return c >= 'a' && c <= 'z';

    }

    static boolean isAlpha(char c) {

        return (c >= 'A' && c <= 'Z') || (c >= 'a' && c <= 'z');

    }

    static boolean isAlphaString(String s) {

        int len = s.length();

        for (int i = 0; i < len; i++) {

            if (!isAlpha(s.charAt(i))) {

                return false;

            }

        }

        return true;

    }

    static boolean isNumeric(char c) {

        return (c >= '0' && c <= '9');

    }

    static boolean isNumericString(String s) {

        int len = s.length();

        for (int i = 0; i < len; i++) {

            if (!isNumeric(s.charAt(i))) {

                return false;

            }

        }

        return true;

    }

    static boolean isAlphaNumeric(char c) {

        return isAlpha(c) || isNumeric(c);

    }

    public static boolean isAlphaNumericString(String s) {

        int len = s.length();

        for (int i = 0; i < len; i++) {

            if (!isAlphaNumeric(s.charAt(i))) {

                return false;

            }

        }

        return true;

    }

    public static boolean isEmpty(String str) {

        return str == null || str.isEmpty();

    }

    public static boolean isEmpty(Set<?> set) {

        return set == null || set.isEmpty();

    }

    public static boolean isEmpty(Map<?, ?> map) {

        return map == null || map.isEmpty();

    }

    public static boolean isEmpty(List<?> list) {

        return list == null || list.isEmpty();

    }

}