Java Java String Unescape unescapeJava(String value)

Description

unescape Java

License

Open Source License

Declaration

public static String unescapeJava(String value) 

Method Source Code

//package com.java2s;
/**/*from  w ww  .  j  a  v  a 2s .  com*/
 * jetbrick-template
 * http://subchen.github.io/jetbrick-template/
 *
 * Copyright 2010-2014 Guoqiang Chen. All rights reserved.
 * Email: subchen@gmail.com
 *
 * 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.
 */

public class Main {
    public static String unescapeJava(String value) {
        if (value == null || value.length() == 0) {
            return value;
        }
        StringBuilder buf = null;
        int len = value.length();
        int len1 = len - 1;
        for (int i = 0; i < len; i++) {
            char ch = value.charAt(i);
            if (ch == '\\' && i < len1) {
                int j = i;
                i++;
                ch = value.charAt(i);
                switch (ch) {
                case '\\':
                    ch = '\\';
                    break;
                case '\"':
                    ch = '\"';
                    break;
                case '\'':
                    ch = '\'';
                    break;
                case 't':
                    ch = '\t';
                    break;
                case 'n':
                    ch = '\n';
                    break;
                case 'r':
                    ch = '\r';
                    break;
                case 'b':
                    ch = '\b';
                    break;
                case 'f':
                    ch = '\f';
                    break;
                default:
                    j--;
                }
                if (buf == null) {
                    buf = new StringBuilder(len);
                    if (j > 0) {
                        buf.append(value.substring(0, j));
                    }
                }
                buf.append(ch);
            } else if (buf != null) {
                buf.append(ch);
            }
        }
        if (buf != null) {
            return buf.toString();
        }
        return value;
    }
}

Related

1. unescapeJava(final String str)
2. unescapeJava(final String str)
3. unescapeJava(String escaped)
4. unescapeJava(String s)
5. unescapeJava(String str)