Java Hex Convert To fromHex(final CharSequence s)

Description

from Hex

License

Open Source License

Declaration

public final static int fromHex(final CharSequence s) 

Method Source Code

//package com.java2s;
/**//www  .  ja v  a2s.co  m
 * The contents of this file are subject to the Regenstrief Public License
 * Version 1.0 (the "License"); you may not use this file except in compliance with the License.
 * Please contact Regenstrief Institute if you would like to obtain a copy of the license.
 *
 * Software distributed under the License is distributed on an "AS IS"
 * basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See the
 * License for the specific language governing rights and limitations
 * under the License.
 *
 * Copyright (C) Regenstrief Institute.  All Rights Reserved.
 */

public class Main {
    public final static int fromHex(final char c) {
        if ((c >= '0') && (c <= '9')) {
            return c - '0';
        } else if (c >= 'a' && c <= 'f') {
            return c - 'a' + 10;
        } else if (c >= 'A' && c <= 'F') {
            return c - 'A' + 10;
        }
        throw new IllegalArgumentException("Invalid hex character " + c);
    }

    public final static int fromHex(final char c1, final char c2) {
        return fromHex(c1) * 16 + fromHex(c2);
    }

    public final static int fromHex(final CharSequence s) {
        return fromHex(s, 0, length(s));
    }

    public final static int fromHex(final CharSequence s, final int off, final int len) {
        int r = 0;
        for (int i = off; i < len; i++) {
            r = (r * 16) + fromHex(s.charAt(i));
        }
        return r;
    }

    /**
     * Returns the length of the given array
     * 
     * @param array the array for which to return the length
     * @return the length
     **/
    public final static int length(final Object array) {
        if (array == null) {
            return 0;
        } else if (array instanceof byte[]) {
            return ((byte[]) array).length;
        } else if (array instanceof short[]) {
            return ((short[]) array).length;
        } else if (array instanceof int[]) {
            return ((int[]) array).length;
        } else if (array instanceof long[]) {
            return ((long[]) array).length;
        } else if (array instanceof float[]) {
            return ((float[]) array).length;
        } else if (array instanceof double[]) {
            return ((double[]) array).length;
        } else if (array instanceof boolean[]) {
            return ((boolean[]) array).length;
        } else if (array instanceof char[]) {
            return ((char[]) array).length;
        }
        return ((Object[]) array).length;
    }

    /**
     * Returns the length of the given array
     * 
     * @param array the array for which to return the length
     * @return the length
     **/
    public final static int length(final Object[] array) {
        return array == null ? 0 : array.length;
    }

    /**
     * Returns the length of the given array
     * 
     * @param array the array for which to return the length
     * @return the length
     **/
    public final static int length(final byte[] array) {
        return array == null ? 0 : array.length;
    }

    /**
     * Returns the length of the given array
     * 
     * @param array the array for which to return the length
     * @return the length
     **/
    public final static int length(final int[] array) {
        return array == null ? 0 : array.length;
    }

    /**
     * Retrieves the length of the CharSequence
     * 
     * @param s the CharSequence
     * @return the length
     **/
    public final static int length(final CharSequence s) {
        return s == null ? 0 : s.length();
    }
}

Related

1. fromHex(byte[] hex)
2. fromHex(char c)
3. fromHex(char c)
4. fromHex(char hi, char lo)
5. fromHex(CharSequence cs)
6. fromHex(final String hex)
7. fromHex(final String hex)
8. fromHex(final String hexValue)
9. fromHex(final String s)