Java Unicode Escape unicodeEscaped(final Character ch)

Description

Converts the string to the Unicode format '\u0020'.

This format is the Java source code format.

If null is passed in, null will be returned.

 CharUtils.unicodeEscaped(null) = null CharUtils.unicodeEscaped(' ')  = "\u0020" CharUtils.unicodeEscaped('A')  = "\u0041" 

License

Apache License

Parameter

Parameter	Description
ch	the character to convert, may be null

Return

the escaped Unicode string, null if null input

Declaration

public static String unicodeEscaped(final Character ch) 

Method Source Code

//package com.java2s;
/*/*from   w  w w . ja  v  a  2  s.c  o m*/
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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.
 */

public class Main {
    private static final String[] CHAR_STRING_ARRAY = new String[128];
    private static final char[] HEX_DIGITS = new char[] { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'a',
            'b', 'c', 'd', 'e', 'f' };

    /**
     * <p>Converts the string to the Unicode format '\u0020'.</p>
     * 
     * <p>This format is the Java source code format.</p>
     *
     * <pre>
     *   CharUtils.unicodeEscaped(' ') = "\u0020"
     *   CharUtils.unicodeEscaped('A') = "\u0041"
     * </pre>
     * 
     * @param ch  the character to convert
     * @return the escaped Unicode string
     */
    public static String unicodeEscaped(final char ch) {
        StringBuilder sb = new StringBuilder(6);
        sb.append("\\u");
        sb.append(HEX_DIGITS[(ch >> 12) & 15]);
        sb.append(HEX_DIGITS[(ch >> 8) & 15]);
        sb.append(HEX_DIGITS[(ch >> 4) & 15]);
        sb.append(HEX_DIGITS[(ch) & 15]);
        return sb.toString();
    }

    /**
     * <p>Converts the string to the Unicode format '\u0020'.</p>
     * 
     * <p>This format is the Java source code format.</p>
     * 
     * <p>If {@code null} is passed in, {@code null} will be returned.</p>
     *
     * <pre>
     *   CharUtils.unicodeEscaped(null) = null
     *   CharUtils.unicodeEscaped(' ')  = "\u0020"
     *   CharUtils.unicodeEscaped('A')  = "\u0041"
     * </pre>
     * 
     * @param ch  the character to convert, may be null
     * @return the escaped Unicode string, null if null input
     */
    public static String unicodeEscaped(final Character ch) {
        if (ch == null) {
            return null;
        }
        return unicodeEscaped(ch.charValue());
    }

    /**
     * <p>Converts the character to a String that contains the one character.</p>
     * 
     * <p>For ASCII 7 bit characters, this uses a cache that will return the
     * same String object each time.</p>
     *
     * <pre>
     *   CharUtils.toString(' ')  = " "
     *   CharUtils.toString('A')  = "A"
     * </pre>
     *
     * @param ch  the character to convert
     * @return a String containing the one specified character
     */
    public static String toString(final char ch) {
        if (ch < 128) {
            return CHAR_STRING_ARRAY[ch];
        }
        return new String(new char[] { ch });
    }

    /**
     * <p>Converts the character to a String that contains the one character.</p>
     * 
     * <p>For ASCII 7 bit characters, this uses a cache that will return the
     * same String object each time.</p>
     * 
     * <p>If {@code null} is passed in, {@code null} will be returned.</p>
     *
     * <pre>
     *   CharUtils.toString(null) = null
     *   CharUtils.toString(' ')  = " "
     *   CharUtils.toString('A')  = "A"
     * </pre>
     *
     * @param ch  the character to convert
     * @return a String containing the one specified character
     */
    public static String toString(final Character ch) {
        if (ch == null) {
            return null;
        }
        return toString(ch.charValue());
    }
}

Related

1. unicodeEscape(String s)
2. unicodeEscape(StringBuilder result, int in, int index)
3. unicodeEscaped(char ch)
4. unicodeEscaped(Character ch)
5. unicodeEscaped(Character ch)
6. unicodeEscaped(final String str)
7. unicodeEscapeEncode(String unicode)
8. unicodeHexEscapeJava(char ch)
9. unicodeUnescape(String st)