LeadingAsteriskMatcher.java

  1. /*
  2.  * Copyright (C) 2014, Andrey Loskutov <loskutov@gmx.de>
  3.  * and other copyright owners as documented in the project's IP log.
  4.  *
  5.  * This program and the accompanying materials are made available
  6.  * under the terms of the Eclipse Distribution License v1.0 which
  7.  * accompanies this distribution, is reproduced below, and is
  8.  * available at http://www.eclipse.org/org/documents/edl-v10.php
  9.  *
  10.  * All rights reserved.
  11.  *
  12.  * Redistribution and use in source and binary forms, with or
  13.  * without modification, are permitted provided that the following
  14.  * conditions are met:
  15.  *
  16.  * - Redistributions of source code must retain the above copyright
  17.  *   notice, this list of conditions and the following disclaimer.
  18.  *
  19.  * - Redistributions in binary form must reproduce the above
  20.  *   copyright notice, this list of conditions and the following
  21.  *   disclaimer in the documentation and/or other materials provided
  22.  *   with the distribution.
  23.  *
  24.  * - Neither the name of the Eclipse Foundation, Inc. nor the
  25.  *   names of its contributors may be used to endorse or promote
  26.  *   products derived from this software without specific prior
  27.  *   written permission.
  28.  *
  29.  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
  30.  * CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
  31.  * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  32.  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  33.  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
  34.  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  35.  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  36.  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  37.  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
  38.  * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  39.  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  40.  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
  41.  * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  42.  */
  43. package org.eclipse.jgit.ignore.internal;

  44. /**
  45.  * Matcher for simple regex patterns starting with an asterisk, e.g. "*.tmp"
  46.  */
  47. public class LeadingAsteriskMatcher extends NameMatcher {

  48.     LeadingAsteriskMatcher(String pattern, Character pathSeparator, boolean dirOnly) {
  49.         super(pattern, pathSeparator, dirOnly, true);

  50.         if (subPattern.charAt(0) != '*')
  51.             throw new IllegalArgumentException(
  52.                     "Pattern must have leading asterisk: " + pattern); //$NON-NLS-1$
  53.     }

  54.     /** {@inheritDoc} */
  55.     @Override
  56.     public boolean matches(String segment, int startIncl, int endExcl) {
  57.         // faster local access, same as in string.indexOf()
  58.         String s = subPattern;

  59.         // we don't need to count '*' character itself
  60.         int subLength = s.length() - 1;
  61.         // simple /*/ pattern
  62.         if (subLength == 0)
  63.             return true;

  64.         if (subLength > (endExcl - startIncl))
  65.             return false;

  66.         for (int i = subLength, j = endExcl - 1; i > 0; i--, j--) {
  67.             char c1 = s.charAt(i);
  68.             char c2 = segment.charAt(j);
  69.             if (c1 != c2)
  70.                 return false;
  71.         }
  72.         return true;
  73.     }

  74. }