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Viewing changes to contrib/NGit/NGit.Storage.File/ReflogReader.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/ReflogReader.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.
 
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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.
 
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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 System;
 
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using System.Collections.Generic;
 
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using System.IO;
 
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using NGit;
 
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using NGit.Storage.File;
 
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using NGit.Util;
 
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using Sharpen;
 
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namespace NGit.Storage.File
 
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{
 
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        /// <summary>Utility for reading reflog entries</summary>
 
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        public class ReflogReader
 
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        {
 
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                /// <summary>Parsed reflog entry</summary>
 
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                public class Entry
 
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                {
 
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                        private ObjectId oldId;
 
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                        private ObjectId newId;
 
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                        private PersonIdent who;
 
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                        private string comment;
 
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                        internal Entry(byte[] raw, int pos)
 
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                        {
 
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                                oldId = ObjectId.FromString(raw, pos);
 
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                                pos += Constants.OBJECT_ID_STRING_LENGTH;
 
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                                if (raw[pos++] != ' ')
 
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                                {
 
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                                        throw new ArgumentException(JGitText.Get().rawLogMessageDoesNotParseAsLogEntry);
 
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                                }
 
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                                newId = ObjectId.FromString(raw, pos);
 
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                                pos += Constants.OBJECT_ID_STRING_LENGTH;
 
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                                if (raw[pos++] != ' ')
 
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                                {
 
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                                        throw new ArgumentException(JGitText.Get().rawLogMessageDoesNotParseAsLogEntry);
 
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                                }
 
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                                who = RawParseUtils.ParsePersonIdentOnly(raw, pos);
 
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                                int p0 = RawParseUtils.Next(raw, pos, '\t');
 
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                                if (p0 >= raw.Length)
 
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                                {
 
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                                        comment = string.Empty;
 
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                                }
 
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                                else
 
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                                {
 
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                                        // personident has no \t, no comment present
 
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                                        int p1 = RawParseUtils.NextLF(raw, p0);
 
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                                        comment = p1 > p0 ? RawParseUtils.Decode(raw, p0, p1 - 1) : string.Empty;
 
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                                }
 
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                        }
 
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                        /// <returns>the commit id before the change</returns>
 
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                        public virtual ObjectId GetOldId()
 
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                        {
 
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                                return oldId;
 
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                        }
 
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                        /// <returns>the commit id after the change</returns>
 
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                        public virtual ObjectId GetNewId()
 
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                        {
 
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                                return newId;
 
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                        }
 
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                        /// <returns>user performin the change</returns>
 
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                        public virtual PersonIdent GetWho()
 
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                        {
 
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                                return who;
 
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                        }
 
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                        /// <returns>textual description of the change</returns>
 
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                        public virtual string GetComment()
 
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                        {
 
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                                return comment;
 
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                        }
 
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                        public override string ToString()
 
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                        {
 
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                                return "Entry[" + oldId.Name + ", " + newId.Name + ", " + GetWho() + ", " + GetComment
 
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                                        () + "]";
 
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                        }
 
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                }
 
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                private FilePath logName;
 
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                internal ReflogReader(Repository db, string refname)
 
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                {
 
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                        logName = new FilePath(db.Directory, "logs/" + refname);
 
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                }
 
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                /// <summary>Get the last entry in the reflog</summary>
 
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                /// <returns>the latest reflog entry, or null if no log</returns>
 
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                /// <exception cref="System.IO.IOException">System.IO.IOException</exception>
 
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                public virtual ReflogReader.Entry GetLastEntry()
 
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                {
 
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                        IList<ReflogReader.Entry> entries = GetReverseEntries(1);
 
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                        return entries.Count > 0 ? entries[0] : null;
 
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                }
 
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                /// <returns>all reflog entries in reverse order</returns>
 
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                /// <exception cref="System.IO.IOException">System.IO.IOException</exception>
 
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                public virtual IList<ReflogReader.Entry> GetReverseEntries()
 
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                {
 
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                        return GetReverseEntries(int.MaxValue);
 
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                }
 
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                /// <param name="max">max numer of entries to read</param>
 
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                /// <returns>all reflog entries in reverse order</returns>
 
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                /// <exception cref="System.IO.IOException">System.IO.IOException</exception>
 
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                public virtual IList<ReflogReader.Entry> GetReverseEntries(int max)
 
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                {
 
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                        byte[] log;
 
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                        try
 
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                        {
 
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                                log = IOUtil.ReadFully(logName);
 
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                        }
 
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                        catch (FileNotFoundException)
 
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                        {
 
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                                return Sharpen.Collections.EmptyList<ReflogReader.Entry>();
 
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                        }
 
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                        int rs = RawParseUtils.PrevLF(log, log.Length);
 
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                        IList<ReflogReader.Entry> ret = new AList<ReflogReader.Entry>();
 
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                        while (rs >= 0 && max-- > 0)
 
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                        {
 
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                                rs = RawParseUtils.PrevLF(log, rs);
 
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                                ReflogReader.Entry entry = new ReflogReader.Entry(log, rs < 0 ? 0 : rs + 2);
 
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                                ret.AddItem(entry);
 
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                        }
 
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                        return ret;
 
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                }
 
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        }
 
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}