Returns the quoted version of the string using the quotechar argument. : Escape Sequences « Data Type « Java Tutorial






import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.StringWriter;

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 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * Redistributions of source code must retain the above copyright notice, this
 * list of conditions and the following disclaimer.
 *
 * Redistributions in binary form must reproduce the above copyright notice,
 * this list of conditions and the following disclaimer in the documentation
 * and/or other materials provided with the distribution.
 *
 * Neither the name of the Hypersonic SQL Group nor the names of its
 * contributors may be used to endorse or promote products derived from this
 * software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE HYPERSONIC SQL GROUP,
 * OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 * This software consists of voluntary contributions made by many individuals
 * on behalf of the Hypersonic SQL Group.
 *
 *
 * For work added by the HSQL Development Group:
 *
 * Copyright (c) 2001-2009, The HSQL Development Group
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * Redistributions of source code must retain the above copyright notice, this
 * list of conditions and the following disclaimer.
 *
 * Redistributions in binary form must reproduce the above copyright notice,
 * this list of conditions and the following disclaimer in the documentation
 * and/or other materials provided with the distribution.
 *
 * Neither the name of the HSQL Development Group nor the names of its
 * contributors may be used to endorse or promote products derived from this
 * software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL HSQL DEVELOPMENT GROUP, HSQLDB.ORG,
 * OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

/**
 * Collection of static methods for converting strings between different formats
 * and to and from byte arrays.
 * 
 * 
 * Includes some methods based on Hypersonic code as indicated.
 * 
 * @author Thomas Mueller (Hypersonic SQL Group)
 * @author Fred Toussi (fredt@users dot sourceforge.net)
 * @version 1.9.0
 * @since 1.7.2
 */
public class Main {

  /**
   * Returns the quoted version of the string using the quotechar argument.
   * doublequote argument indicates whether each instance of quotechar inside
   * the string is doubled.
   *
   * null string argument returns null. If the caller needs the literal
   * "NULL" it should created it itself
   *
   * @param s Java string
   * @param quoteChar character used for quoting
   * @param extraQuote true if quoteChar itself should be repeated
   * @return String
   */
  public static String toQuotedString(String s, char quoteChar,
                                      boolean extraQuote) {

      if (s == null) {
          return null;
      }

      int    count = extraQuote ? count(s, quoteChar)
                                : 0;
      int    len   = s.length();
      char[] b     = new char[2 + count + len];
      int    i     = 0;
      int    j     = 0;

      b[j++] = quoteChar;

      for (; i < len; i++) {
          char c = s.charAt(i);

          b[j++] = c;

          if (extraQuote && c == quoteChar) {
              b[j++] = c;
          }
      }

      b[j] = quoteChar;

      return new String(b);
  }

  /**
   * Counts Character c in String s
   *
   * @param s Java string
   * @param c character to count
   * @return int count
   */
  static int count(final String s, final char c) {

      int pos   = 0;
      int count = 0;

      if (s != null) {
          while ((pos = s.indexOf(c, pos)) > -1) {
              count++;
              pos++;
          }
      }

      return count;
  }
}








2.35.Escape Sequences
2.35.1.Table for escape sequence character
2.35.2.Character Escape Sequences
2.35.3.\\: to specify a backslash character as a character literal or in a text string
2.35.4.Convert lines into the canonical format, that is, terminate lines with the CRLF sequence.
2.35.5.Returns the quoted version of the string using the quotechar argument.
2.35.6.Determines if this is a quoted argumented - either single or double quoted.