Java UTF from toUtf8Code(char utf16)

Description

convert java character literal to utf8 code

License

Apache License

Parameter

Parameter	Description
utf16	java character literal

Return

utf8 code

Declaration

public static int toUtf8Code(char utf16) 

Method Source Code

//package com.java2s;
/*/*from   w w w.  ja  v a 2 s  .c o  m*/
 * Copyright (C) 2014-2015 Nagisa Sekiguchi
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

import java.nio.charset.Charset;

public class Main {
    public final static Charset DEFAULT_CHARSET = Charset.forName("UTF-8");

    /**
     * convert java character literal to utf8 code
     *
     * @param utf16 java character literal
     * @return utf8 code
     */
    public static int toUtf8Code(char utf16) {
        byte[] buf = Character.toString(utf16).getBytes(DEFAULT_CHARSET);
        return toUtf8Code(buf, 0, buf.length);
    }

    /**
     * convert unicode code point to utf8 code
     *
     * @param codePoint
     * @return utf8 code
     */
    public static int toUtf8Code(int codePoint) {
        byte[] buf = new String(Character.toChars(codePoint)).getBytes(DEFAULT_CHARSET);
        return toUtf8Code(buf, 0, buf.length);
    }

    /**
     * convert byte array to utf8 code
     *
     * @param buf
     * @param startIndex
     * @param charLength 1, 2, 3 or 4
     * @return utf8 code
     */
    public static int toUtf8Code(byte[] buf, int startIndex, int charLength) {
        switch (charLength) {
        case 1:
            return buf[startIndex];
        case 2:
            return (Byte.toUnsignedInt(buf[startIndex]) << 8) | Byte.toUnsignedInt(buf[++startIndex]);
        case 3:
            return (Byte.toUnsignedInt(buf[startIndex]) << 16) | (Byte.toUnsignedInt(buf[++startIndex]) << 8)
                    | Byte.toUnsignedInt(buf[++startIndex]);
        case 4:
            return (Byte.toUnsignedInt(buf[startIndex]) << 24) | (Byte.toUnsignedInt(buf[++startIndex]) << 16)
                    | (Byte.toUnsignedInt(buf[++startIndex]) << 8) | Byte.toUnsignedInt(buf[++startIndex]);
        default:
            throw new RuntimeException("broken string");
        }
    }
}

Related

1. toUTF8(String str)
2. toUTF8(String string)
3. toUtf8(String texto)
4. toUTF8ByteArray(String s)
5. toUtf8ByteArray(String source)
6. toUtf8Codes(String str)
7. toUTF8FromLatin1(byte[] outputBuffer, String string)
8. toUTF8k(String in)
9. toUtf8Path(String path)