Java String Double Quote doubleQuote(String s)

Description

Place double quotes arround input string, Escape single quotes that will cause problems.

License

Open Source License

Parameter

Parameter	Description
s	incomming string to quote

Return

quoted string

Declaration

public static String doubleQuote(String s) 

Method Source Code

//package com.java2s;
/*/* w w  w .jav  a 2s .c  o m*/
 * Copyright (C) 2009-2013 Patrick Farrell. All Rights reserved.
 * 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 {
    /**
     * Place double quotes arround input string,
     * Escape single quotes that will cause problems.
     * remove any CR, CRLF, newlines, etc.
     * 
     * @param s incomming string to quote
     * @return quoted string
     */
    public static String doubleQuote(String s) {
        if (s == null)
            return "NULL";
        StringBuilder sb = new StringBuilder();
        sb.append('"');
        for (int i = 0; i < s.length(); i++) {
            char ch = s.charAt(i);
            if (ch == '\'')
                sb.append("\\'"); //ugly code too many doubled backslashes
            else if (ch == '\\')
                sb.append("\\\\");
            else if (ch == '\n')
                sb.append(" ");
            else if (ch == '\r')
                sb.append(" ");
            else
                sb.append(ch);
        }
        sb.append('"');
        return sb.toString();
    }
}

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