SpacePadder xref

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    1   /**
    2    * Copyright (c) 2004-2011 QOS.ch
    3    * All rights reserved.
    4    *
    5    * Permission is hereby granted, free  of charge, to any person obtaining
    6    * a  copy  of this  software  and  associated  documentation files  (the
    7    * "Software"), to  deal in  the Software without  restriction, including
    8    * without limitation  the rights to  use, copy, modify,  merge, publish,
    9    * distribute,  sublicense, and/or sell  copies of  the Software,  and to
    10   * permit persons to whom the Software  is furnished to do so, subject to
    11   * the following conditions:
    12   *
    13   * The  above  copyright  notice  and  this permission  notice  shall  be
    14   * included in all copies or substantial portions of the Software.
    15   *
    16   * THE  SOFTWARE IS  PROVIDED  "AS  IS", WITHOUT  WARRANTY  OF ANY  KIND,
    17   * EXPRESS OR  IMPLIED, INCLUDING  BUT NOT LIMITED  TO THE  WARRANTIES OF
    18   * MERCHANTABILITY,    FITNESS    FOR    A   PARTICULAR    PURPOSE    AND
    19   * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
    20   * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
    21   * OF CONTRACT, TORT OR OTHERWISE,  ARISING FROM, OUT OF OR IN CONNECTION
    22   * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
    23   *
    24   */
    25  package org.slf4j.profiler;
    26
    27  public class SpacePadder {
    28    public static final String LINE_SEP = System.getProperty("line.separator");
    29
    30    final static String[] SPACES = { " ", "  ", "    ", "        ", // 1,2,4,8
    31        // spaces
    32        "                ", // 16 spaces
    33        "                                " }; // 32 spaces
    34
    35    final static public void leftPad(StringBuffer buf, String s, int desiredLength) {
    36      int actualLen = 0;
    37      if (s != null) {
    38        actualLen = s.length();
    39      }
    40      if (actualLen < desiredLength) {
    41        spacePad(buf, desiredLength - actualLen);
    42      }
    43      if (s != null) {
    44        buf.append(s);
    45      }
    46    }
    47
    48    final static public void rightPad(StringBuffer buf, String s, int desiredLength) {
    49      int actualLen = 0;
    50      if (s != null) {
    51        actualLen = s.length();
    52      }
    53      if (s != null) {
    54        buf.append(s);
    55      }
    56      if (actualLen < desiredLength) {
    57        spacePad(buf, desiredLength - actualLen);
    58      }
    59    }
    60
    61    /**
    62     * Fast space padding method.
    63     *
    64     * @param sbuf the buffer to pad
    65     * @param length the target size of the buffer after padding
    66     */
    67    final static public void spacePad(StringBuffer sbuf, int length) {
    68      while (length >= 32) {
    69        sbuf.append(SPACES[5]);
    70        length -= 32;
    71      }
    72
    73      for (int i = 4; i >= 0; i--) {
    74        if ((length & (1 << i)) != 0) {
    75          sbuf.append(SPACES[i]);
    76        }
    77      }
    78    }
    79  }