encode Base37 - Java java.lang

Java examples for java.lang:long

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Description

encode Base37

Demo Code

/**// w  w  w.j  a va2s . c o m
 * Copyright (c) 2014 Virtue Studios
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 * 
 * The above copyright notice and this permission notice shall be included in all
 * copies or substantial portions of the Software.
 * 
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */
//package com.java2s;

public class Main {
    public static void main(String[] argv) throws Exception {
        String str = "java2s.com";
        System.out.println(encodeBase37(str));
    }

    public static long encodeBase37(String str) {
        int len = str.length();
        if (len > 12)
            throw new IllegalArgumentException("String too long.");

        long value = 0;
        for (int pos = 0; pos < len; pos++) {
            char c = str.charAt(pos);
            value *= 37;

            if (c >= 'A' && c <= 'Z')
                value += c - 'A' + 1;
            else if (c >= 'a' && c <= 'z')
                value += c - 'a' + 1;
            else if (c >= '0' && c <= '9')
                value += c - '0' + 27;
            else if (c != ' ' && c != '_')
                throw new IllegalArgumentException(
                        "Illegal character in string: " + c + ".");
        }

        while (value != 0 && (value % 37) == 0)
            value /= 37;

        return value;
    }
}

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