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Viewing changes to contrib/NGit/NGit.Storage.File/RefDirectoryUpdate.cs

  • Committer: Bazaar Package Importer
  • Author(s): Jo Shields
  • Date: 2011-06-27 17:03:13 UTC
  • mto: (1.8.1 upstream)
  • mto: This revision was merged to the branch mainline in revision 54.
  • Revision ID: james.westby@ubuntu.com-20110627170313-6cvz3s19x6e9hqe9
Import upstream version 2.5.92+dfsg

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contrib/NGit/NGit.Storage.File/RefDirectoryUpdate.cs
 
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/*
 
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This code is derived from jgit (http://eclipse.org/jgit).
 
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Copyright owners are documented in jgit's IP log.
 
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This program and the accompanying materials are made available
 
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under the terms of the Eclipse Distribution License v1.0 which
 
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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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All rights reserved.
 
11
 
 
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Redistribution and use in source and binary forms, with or
 
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without modification, are permitted provided that the following
 
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conditions are met:
 
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- Redistributions of source code must retain the above copyright
 
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  notice, this list of conditions and the following disclaimer.
 
18
 
 
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- Redistributions in binary form must reproduce the above
 
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  copyright notice, this list of conditions and the following
 
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  disclaimer in the documentation and/or other materials provided
 
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  with the distribution.
 
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- Neither the name of the Eclipse Foundation, Inc. nor the
 
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  names of its contributors may be used to endorse or promote
 
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  products derived from this software without specific prior
 
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  written permission.
 
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
 
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CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
 
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INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 
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OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 
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ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
 
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CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 
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SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 
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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,
 
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STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 
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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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*/
 
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using NGit;
 
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using NGit.Storage.File;
 
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using Sharpen;
 
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namespace NGit.Storage.File
 
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{
 
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        /// <summary>
 
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        /// Updates any reference stored by
 
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        /// <see cref="RefDirectory">RefDirectory</see>
 
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        /// .
 
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        /// </summary>
 
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        internal class RefDirectoryUpdate : RefUpdate
 
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        {
 
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                private readonly RefDirectory database;
 
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                private LockFile Lock;
 
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                internal RefDirectoryUpdate(RefDirectory r, Ref @ref) : base(@ref)
 
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                {
 
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                        database = r;
 
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                }
 
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                protected internal override RefDatabase GetRefDatabase()
 
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                {
 
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                        return database;
 
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                }
 
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                protected internal override Repository GetRepository()
 
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                {
 
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                        return database.GetRepository();
 
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                }
 
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                /// <exception cref="System.IO.IOException"></exception>
 
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                protected internal override bool TryLock(bool deref)
 
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                {
 
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                        Ref dst = GetRef();
 
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                        if (deref)
 
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                        {
 
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                                dst = dst.GetLeaf();
 
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                        }
 
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                        string name = dst.GetName();
 
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                        Lock = new LockFile(database.FileFor(name), GetRepository().FileSystem);
 
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                        if (Lock.Lock())
 
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                        {
 
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                                dst = database.GetRef(name);
 
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                                SetOldObjectId(dst != null ? dst.GetObjectId() : null);
 
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                                return true;
 
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                        }
 
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                        else
 
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                        {
 
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                                return false;
 
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                        }
 
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                }
 
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                protected internal override void Unlock()
 
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                {
 
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                        if (Lock != null)
 
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                        {
 
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                                Lock.Unlock();
 
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                                Lock = null;
 
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                        }
 
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                }
 
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                /// <exception cref="System.IO.IOException"></exception>
 
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                protected internal override RefUpdate.Result DoUpdate(RefUpdate.Result status)
 
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                {
 
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                        WriteConfig wc = database.GetRepository().GetConfig().Get(WriteConfig.KEY);
 
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                        Lock.SetFSync(wc.GetFSyncRefFiles());
 
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                        Lock.SetNeedStatInformation(true);
 
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                        Lock.Write(GetNewObjectId());
 
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                        string msg = GetRefLogMessage();
 
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                        if (msg != null)
 
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                        {
 
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                                if (IsRefLogIncludingResult())
 
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                                {
 
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                                        string strResult = ToResultString(status);
 
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                                        if (strResult != null)
 
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                                        {
 
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                                                if (msg.Length > 0)
 
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                                                {
 
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                                                        msg = msg + ": " + strResult;
 
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                                                }
 
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                                                else
 
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                                                {
 
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                                                        msg = strResult;
 
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                                                }
 
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                                        }
 
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                                }
 
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                                database.Log(this, msg, true);
 
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                        }
 
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                        if (!Lock.Commit())
 
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                        {
 
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                                return RefUpdate.Result.LOCK_FAILURE;
 
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                        }
 
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                        database.Stored(this, Lock.GetCommitLastModified());
 
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                        return status;
 
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                }
 
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                private string ToResultString(RefUpdate.Result status)
 
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                {
 
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                        switch (status)
 
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                        {
 
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                                case RefUpdate.Result.FORCED:
 
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                                {
 
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                                        return "forced-update";
 
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                                }
 
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                                case RefUpdate.Result.FAST_FORWARD:
 
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                                {
 
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                                        return "fast forward";
 
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                                }
 
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                                case RefUpdate.Result.NEW:
 
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                                {
 
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                                        return "created";
 
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                                }
 
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                                default:
 
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                                {
 
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                                        return null;
 
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                                        break;
 
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                                }
 
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                        }
 
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                }
 
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                /// <exception cref="System.IO.IOException"></exception>
 
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                protected internal override RefUpdate.Result DoDelete(RefUpdate.Result status)
 
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                {
 
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                        if (GetRef().GetLeaf().GetStorage() != RefStorage.NEW)
 
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                        {
 
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                                database.Delete(this);
 
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                        }
 
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                        return status;
 
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                }
 
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                /// <exception cref="System.IO.IOException"></exception>
 
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                protected internal override RefUpdate.Result DoLink(string target)
 
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                {
 
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                        WriteConfig wc = database.GetRepository().GetConfig().Get(WriteConfig.KEY);
 
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                        Lock.SetFSync(wc.GetFSyncRefFiles());
 
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                        Lock.SetNeedStatInformation(true);
 
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                        Lock.Write(Constants.Encode(RefDirectory.SYMREF + target + '\n'));
 
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                        string msg = GetRefLogMessage();
 
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                        if (msg != null)
 
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                        {
 
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                                database.Log(this, msg, false);
 
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                        }
 
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                        if (!Lock.Commit())
 
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                        {
 
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                                return RefUpdate.Result.LOCK_FAILURE;
 
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                        }
 
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                        database.StoredSymbolicRef(this, Lock.GetCommitLastModified(), target);
 
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                        if (GetRef().GetStorage() == RefStorage.NEW)
 
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                        {
 
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                                return RefUpdate.Result.NEW;
 
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                        }
 
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                        return RefUpdate.Result.FORCED;
 
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                }
 
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        }
 
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}