Java String Escape escapeJavaString(String str)

Description

escape Java String

License

Apache License

Declaration

public static String escapeJavaString(String str) 

Method Source Code

//package com.java2s;
/*// w  w  w  .  java  2s .com
Copyright 2016 Goldman Sachs.
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.util.*;

public class Main {
    public static String escapeJavaString(String str) {
        StringBuilder builder = new StringBuilder(str.length());
        for (int i = 0; i < str.length(); i++) {
            char ch = str.charAt(i);

            // handle unicode
            if (ch > 0xfff) {
                builder.append("\\u" + Integer.toHexString(ch).toUpperCase(Locale.ENGLISH));
            } else if (ch > 0xff) {
                builder.append("\\u0" + Integer.toHexString(ch).toUpperCase(Locale.ENGLISH));
            } else if (ch > 0x7f) {
                builder.append("\\u00" + Integer.toHexString(ch).toUpperCase(Locale.ENGLISH));
            } else if (ch < 32) {
                switch (ch) {
                case '\b':
                    builder.append('\\');
                    builder.append('b');
                    break;
                case '\n':
                    builder.append('\\');
                    builder.append('n');
                    break;
                case '\t':
                    builder.append('\\');
                    builder.append('t');
                    break;
                case '\f':
                    builder.append('\\');
                    builder.append('f');
                    break;
                case '\r':
                    builder.append('\\');
                    builder.append('r');
                    break;
                default:
                    if (ch > 0xf) {
                        builder.append("\\u00" + Integer.toHexString(ch).toUpperCase(Locale.ENGLISH));
                    } else {
                        builder.append("\\u000" + Integer.toHexString(ch).toUpperCase(Locale.ENGLISH));
                    }
                    break;
                }
            } else {
                switch (ch) {
                case '"':
                    builder.append('\\');
                    builder.append('"');
                    break;
                case '\\':
                    builder.append('\\');
                    builder.append('\\');
                    break;
                default:
                    builder.append(ch);
                    break;
                }
            }
        }
        return builder.toString();
    }
}

Related

1. escapeCharacters(String string)
2. escapeHTML(String s)
3. escapeHTML(String source)
4. escapeHTMLTags(String in)
5. escapeInstanceIdentifier(String instanceIdentifier)
6. escapeJavaStyleString(StringBuilder out, String str, boolean escapeSingleQuote, boolean escapeForwardSlash)
7. escapeQuotes(String string)
8. escapeRegex(String regex)
9. escapeRegexChars(String str, char... ignores)