org.spearce.jgit/src/org/spearce/jgit/treewalk/filter/NotTreeFilter.java

   1 /*
   2  * Copyright (C) 2008, Shawn O. Pearce <spearce@spearce.org>
   3  *
   4  * All rights reserved.
   5  *
   6  * Redistribution and use in source and binary forms, with or
   7  * without modification, are permitted provided that the following
   8  * conditions are met:
   9  *
  10  * - Redistributions of source code must retain the above copyright
  11  *   notice, this list of conditions and the following disclaimer.
  12  *
  13  * - Redistributions in binary form must reproduce the above
  14  *   copyright notice, this list of conditions and the following
  15  *   disclaimer in the documentation and/or other materials provided
  16  *   with the distribution.
  17  *
  18  * - Neither the name of the Git Development Community nor the
  19  *   names of its contributors may be used to endorse or promote
  20  *   products derived from this software without specific prior
  21  *   written permission.
  22  *
  23  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
  24  * CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
  25  * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  26  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  27  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
  28  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  29  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  30  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  31  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
  32  * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  33  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  34  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
  35  * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  36  */
  37
  38 package org.spearce.jgit.treewalk.filter;
  39
  40 import java.io.IOException;
  41
  42 import org.spearce.jgit.errors.IncorrectObjectTypeException;
  43 import org.spearce.jgit.errors.MissingObjectException;
  44 import org.spearce.jgit.treewalk.TreeWalk;
  45
  46 /** Includes an entry only if the subfilter does not include the entry. */
  47 public class NotTreeFilter extends TreeFilter {
  48         /**
  49          * Create a filter that negates the result of another filter.
  50          *
  51          * @param a
  52          *            filter to negate.
  53          * @return a filter that does the reverse of <code>a</code>.
  54          */
  55         public static TreeFilter create(final TreeFilter a) {
  56                 return new NotTreeFilter(a);
  57         }
  58
  59         private final TreeFilter a;
  60
  61         private NotTreeFilter(final TreeFilter one) {
  62                 a = one;
  63         }
  64
  65         @Override
  66         public TreeFilter negate() {
  67                 return a;
  68         }
  69
  70         @Override
  71         public boolean include(final TreeWalk walker)
  72                         throws MissingObjectException, IncorrectObjectTypeException,
  73                         IOException {
  74                 return !a.include(walker);
  75         }
  76
  77         @Override
  78         public boolean shouldBeRecursive() {
  79                 return a.shouldBeRecursive();
  80         }
  81
  82         @Override
  83         public TreeFilter clone() {
  84                 final TreeFilter n = a.clone();
  85                 return n == a ? this : new NotTreeFilter(n);
  86         }
  87
  88         @Override
  89         public String toString() {
  90                 return "NOT " + a.toString();
  91         }
  92 }