org.spearce.jgit/src/org/spearce/jgit/revwalk/LIFORevQueue.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.revwalk;
  39
  40 import java.io.IOException;
  41
  42 import org.spearce.jgit.errors.IncorrectObjectTypeException;
  43 import org.spearce.jgit.errors.MissingObjectException;
  44
  45 /** A queue of commits in LIFO order. */
  46 public class LIFORevQueue extends BlockRevQueue {
  47         private Block head;
  48
  49         /** Create an empty LIFO queue. */
  50         public LIFORevQueue() {
  51                 super();
  52         }
  53
  54         LIFORevQueue(final Generator s) throws MissingObjectException,
  55                         IncorrectObjectTypeException, IOException {
  56                 super(s);
  57         }
  58
  59         public void add(final RevCommit c) {
  60                 Block b = head;
  61                 if (b == null || !b.canUnpop()) {
  62                         b = free.newBlock();
  63                         b.resetToEnd();
  64                         b.next = head;
  65                         head = b;
  66                 }
  67                 b.unpop(c);
  68         }
  69
  70         public RevCommit next() {
  71                 final Block b = head;
  72                 if (b == null)
  73                         return null;
  74
  75                 final RevCommit c = b.pop();
  76                 if (b.isEmpty()) {
  77                         head = b.next;
  78                         free.freeBlock(b);
  79                 }
  80                 return c;
  81         }
  82
  83         public void clear() {
  84                 head = null;
  85                 free.clear();
  86         }
  87
  88         boolean everbodyHasFlag(final int f) {
  89                 for (Block b = head; b != null; b = b.next) {
  90                         for (int i = b.headIndex; i < b.tailIndex; i++)
  91                                 if ((b.commits[i].flags & f) == 0)
  92                                         return false;
  93                 }
  94                 return true;
  95         }
  96
  97         boolean anybodyHasFlag(final int f) {
  98                 for (Block b = head; b != null; b = b.next) {
  99                         for (int i = b.headIndex; i < b.tailIndex; i++)
 100                                 if ((b.commits[i].flags & f) != 0)
 101                                         return true;
 102                 }
 103                 return false;
 104         }
 105
 106         public String toString() {
 107                 final StringBuffer s = new StringBuffer();
 108                 for (Block q = head; q != null; q = q.next) {
 109                         for (int i = q.headIndex; i < q.tailIndex; i++) {
 110                                 s.append(q.commits[i]);
 111                                 s.append(' ');
 112                                 s.append(q.commits[i].commitTime);
 113                                 s.append('\n');
 114                         }
 115                 }
 116                 return s.toString();
 117         }
 118 }