Java Double Number From toDoubleQuotes(String str)

Description

Takes a string, surrounds it with double-quotes and escapes all double-quotes already in the string according to Unix rules.

License

Open Source License

Parameter

Parameter	Description
str	the string

Return

the string in double quotes

Declaration

public static String toDoubleQuotes(String str) 

Method Source Code

//package com.java2s;
/**//from  ww w.  ja va  2  s. c om
   * Tentackle - a framework for java desktop applications
   * Copyright (C) 2001-2008 Harald Krake, harald@krake.de, +49 7722 9508-0
   *
   * This library is free software; you can redistribute it and/or
   * modify it under the terms of the GNU Lesser General Public
   * License as published by the Free Software Foundation; either
   * version 2.1 of the License, or (at your option) any later version.
   *
   * This library is distributed in the hope that it will be useful,
   * but WITHOUT ANY WARRANTY; without even the implied warranty of
   * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   * Lesser General Public License for more details.
   *
   * You should have received a copy of the GNU Lesser General Public
   * License along with this library; if not, write to the Free Software
   * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
   */

public class Main {
    /** the empty string **/
    public static final String emptyString = "";

    /**
       * Takes a string, surrounds it with double-quotes and escapes all double-quotes
       * already in the string according to Unix rules.
       * Example:
       * <pre>
       * Length 5" --> "Length 5\""
       * </pre>
       * 
       * @param str the string
       * @return the string in double quotes
       */
    public static String toDoubleQuotes(String str) {
        StringBuilder buf = new StringBuilder();
        buf.append('"');
        if (str != null) {
            int len = str.length();
            for (int i = 0; i < len; i++) {
                char c = str.charAt(i);
                if (c == '"') {
                    buf.append('\\');
                } else if (Character.isISOControl(c)) {
                    c = ' '; // transform any controls to spaces
                }
                buf.append(c);
            }
        }
        buf.append('"');
        return buf.toString();
    }

    /**
       * Maps null to the empty string.
       * Simple but essential ;)
       * @param str the string to test against null
       * @return str or the emptystring if str is null
       */
    public static String toString(String str) {
        return str == null ? emptyString : str;
    }
}

Related

1. toDoubleObject(Object obj)
2. toDoublePow10(long m, int n)
3. toDoublePow2(long m, int n)
4. toDoublePrecision(long fixedPrecisionOrdinate)
5. toDoublePrimitiveArray(final Double[] wrappedArray)
6. toDoubles(byte[] bytes)
7. toDoubles(byte[] value, int offset, int num)
8. toDoubles(Double[] values)
9. toDoubles(int[][] intPts)