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Viewing changes to contrib/NGit/NGit.Revwalk/RewriteGenerator.cs

  • Committer: Package Import Robot
  • Author(s): Jo Shields
  • Date: 2012-05-27 18:08:20 UTC
  • mfrom: (19.1.8 experimental)
  • Revision ID: package-import@ubuntu.com-20120527180820-fydl21qnbnfr8w2t
Tags: 3.0.2+dfsg-3
* [fcecfe7] Fix monodevelop-core-addins.pc.in to point to actual 
  installed location of assemblies.
* [26e1a07] DebSrc 3.0 does not support Quilt's -p parameter, so 
  manually adjust the path in the patch file.

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contrib/NGit/NGit.Revwalk/RewriteGenerator.cs
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/*
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This code is derived from jgit (http://eclipse.org/jgit).
3
 
Copyright owners are documented in jgit'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
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available at http://www.eclipse.org/org/documents/edl-v10.php
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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;
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LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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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
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ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
43
 
 
44
 
using NGit.Revwalk;
45
 
using Sharpen;
46
 
 
47
 
namespace NGit.Revwalk
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{
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        /// <summary>Replaces a RevCommit's parents until not colored with REWRITE.</summary>
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        /// <remarks>
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        /// Replaces a RevCommit's parents until not colored with REWRITE.
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        /// <p>
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        /// Before a RevCommit is returned to the caller its parents are updated to
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        /// create a dense DAG. Instead of reporting the actual parents as recorded when
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        /// the commit was created the returned commit will reflect the next closest
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        /// commit that matched the revision walker's filters.
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        /// <p>
58
 
        /// This generator is the second phase of a path limited revision walk and
59
 
        /// assumes it is receiving RevCommits from
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        /// <see cref="RewriteTreeFilter">RewriteTreeFilter</see>
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        /// ,
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        /// after they have been fully buffered by
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        /// <see cref="AbstractRevQueue">AbstractRevQueue</see>
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        /// . The full
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        /// buffering is necessary to allow the simple loop used within our own
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        /// <see cref="Rewrite(RevCommit)">Rewrite(RevCommit)</see>
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        /// to pull completely through a strand of
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        /// <see cref="RevWalk.REWRITE">RevWalk.REWRITE</see>
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        /// colored commits and come up with a simplification
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        /// that makes the DAG dense. Not fully buffering the commits first would cause
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        /// this loop to abort early, due to commits not being parsed and colored
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        /// correctly.
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        /// </remarks>
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        /// <seealso cref="RewriteTreeFilter">RewriteTreeFilter</seealso>
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        internal class RewriteGenerator : Generator
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        {
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                private const int REWRITE = RevWalk.REWRITE;
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                /// <summary>
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                /// For
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                /// <see cref="Cleanup(RevCommit[])">Cleanup(RevCommit[])</see>
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                /// to remove duplicate parents.
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                /// </summary>
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                private const int DUPLICATE = RevWalk.TEMP_MARK;
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                private readonly Generator source;
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88
 
                internal RewriteGenerator(Generator s)
89
 
                {
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                        source = s;
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                }
92
 
 
93
 
                internal override void ShareFreeList(BlockRevQueue q)
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                {
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                        source.ShareFreeList(q);
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                }
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                internal override int OutputType()
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                {
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                        return source.OutputType() & ~NEEDS_REWRITE;
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                }
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                /// <exception cref="NGit.Errors.MissingObjectException"></exception>
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                /// <exception cref="NGit.Errors.IncorrectObjectTypeException"></exception>
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                /// <exception cref="System.IO.IOException"></exception>
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                internal override RevCommit Next()
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                {
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                        for (; ; )
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                        {
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                                RevCommit c = source.Next();
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                                if (c == null)
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                                {
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                                        return null;
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                                }
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                                bool rewrote = false;
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                                RevCommit[] pList = c.parents;
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                                int nParents = pList.Length;
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                                for (int i = 0; i < nParents; i++)
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                                {
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                                        RevCommit oldp = pList[i];
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                                        RevCommit newp = Rewrite(oldp);
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                                        if (oldp != newp)
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                                        {
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                                                pList[i] = newp;
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                                                rewrote = true;
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                                        }
127
 
                                }
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                                if (rewrote)
129
 
                                {
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                                        c.parents = Cleanup(pList);
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                                }
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                                return c;
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                        }
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                }
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                private RevCommit Rewrite(RevCommit p)
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                {
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                        for (; ; )
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                        {
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                                RevCommit[] pList = p.parents;
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                                if (pList.Length > 1)
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                                {
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                                        // This parent is a merge, so keep it.
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                                        //
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                                        return p;
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                                }
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                                if ((p.flags & RevWalk.UNINTERESTING) != 0)
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                                {
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                                        // Retain uninteresting parents. They show where the
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                                        // DAG was cut off because it wasn't interesting.
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                                        //
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                                        return p;
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                                }
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                                if ((p.flags & REWRITE) == 0)
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                                {
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                                        // This parent was not eligible for rewriting. We
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                                        // need to keep it in the DAG.
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                                        //
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                                        return p;
160
 
                                }
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                                if (pList.Length == 0)
162
 
                                {
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                                        // We can't go back any further, other than to
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                                        // just delete the parent entirely.
165
 
                                        //
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                                        return null;
167
 
                                }
168
 
                                p = pList[0];
169
 
                        }
170
 
                }
171
 
 
172
 
                private RevCommit[] Cleanup(RevCommit[] oldList)
173
 
                {
174
 
                        // Remove any duplicate parents caused due to rewrites (e.g. a merge
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                        // with two sides that both simplified back into the merge base).
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                        // We also may have deleted a parent by marking it null.
177
 
                        //
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                        int newCnt = 0;
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                        for (int o = 0; o < oldList.Length; o++)
180
 
                        {
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                                RevCommit p = oldList[o];
182
 
                                if (p == null)
183
 
                                {
184
 
                                        continue;
185
 
                                }
186
 
                                if ((p.flags & DUPLICATE) != 0)
187
 
                                {
188
 
                                        oldList[o] = null;
189
 
                                        continue;
190
 
                                }
191
 
                                p.flags |= DUPLICATE;
192
 
                                newCnt++;
193
 
                        }
194
 
                        if (newCnt == oldList.Length)
195
 
                        {
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                                foreach (RevCommit p in oldList)
197
 
                                {
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                                        p.flags &= ~DUPLICATE;
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                                }
200
 
                                return oldList;
201
 
                        }
202
 
                        RevCommit[] newList = new RevCommit[newCnt];
203
 
                        newCnt = 0;
204
 
                        foreach (RevCommit p_1 in oldList)
205
 
                        {
206
 
                                if (p_1 != null)
207
 
                                {
208
 
                                        newList[newCnt++] = p_1;
209
 
                                        p_1.flags &= ~DUPLICATE;
210
 
                                }
211
 
                        }
212
 
                        return newList;
213
 
                }
214
 
        }
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}