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Viewing changes to contrib/NGit/NGit.Revwalk/RevObjectList.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.Revwalk/RevObjectList.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 NGit;
 
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using NGit.Revwalk;
 
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using Sharpen;
 
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namespace NGit.Revwalk
 
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{
 
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        /// <summary>
 
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        /// An ordered list of
 
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        /// <see cref="RevObject">RevObject</see>
 
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        /// subclasses.
 
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        /// </summary>
 
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        /// <?></?>
 
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        public class RevObjectList<E> : AbstractList<E> where E:RevObject
 
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        {
 
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                internal const int BLOCK_SHIFT = 8;
 
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                internal const int BLOCK_SIZE = 1 << BLOCK_SHIFT;
 
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                /// <summary>Items stored in this list.</summary>
 
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                /// <remarks>
 
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                /// Items stored in this list.
 
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                /// <p>
 
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                /// If
 
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                /// <see cref="RevObjectListBlock.shift">RevObjectListBlock.shift</see>
 
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                /// = 0 this block holds the list elements; otherwise
 
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                /// it holds pointers to other
 
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                /// <see cref="RevObjectListBlock">RevObjectListBlock</see>
 
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                /// instances which use a shift that
 
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                /// is
 
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                /// <see cref="RevObjectList{E}.BLOCK_SHIFT">RevObjectList&lt;E&gt;.BLOCK_SHIFT</see>
 
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                /// smaller.
 
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                /// </remarks>
 
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                internal RevObjectListBlock contents = new RevObjectListBlock(0);
 
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                /// <summary>Current number of elements in the list.</summary>
 
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                /// <remarks>Current number of elements in the list.</remarks>
 
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                protected internal int size = 0;
 
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                /// <summary>Create an empty object list.</summary>
 
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                /// <remarks>Create an empty object list.</remarks>
 
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                public RevObjectList()
 
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                {
 
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                }
 
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                // Initialized above.
 
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                public override void Add(int index, E element)
 
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                {
 
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                        if (index != size)
 
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                        {
 
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                                throw new NotSupportedException(MessageFormat.Format(JGitText.Get().unsupportedOperationNotAddAtEnd
 
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                                        , index));
 
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                        }
 
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                        Set(index, element);
 
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                        size++;
 
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                }
 
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                public override E Set(int index, E element)
 
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                {
 
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                        RevObjectListBlock s = contents;
 
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                        while (index >> s.shift >= BLOCK_SIZE)
 
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                        {
 
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                                s = new RevObjectListBlock(s.shift + BLOCK_SHIFT);
 
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                                s.contents[0] = contents;
 
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                                contents = s;
 
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                        }
 
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                        while (s.shift > 0)
 
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                        {
 
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                                int i = index >> s.shift;
 
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                                index -= i << s.shift;
 
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                                if (s.contents[i] == null)
 
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                                {
 
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                                        s.contents[i] = new RevObjectListBlock(s.shift - BLOCK_SHIFT);
 
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                                }
 
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                                s = (RevObjectListBlock)s.contents[i];
 
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                        }
 
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                        object old = s.contents[index];
 
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                        s.contents[index] = element;
 
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                        return (E)old;
 
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                }
 
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                public override E Get(int index)
 
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                {
 
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                        RevObjectListBlock s = contents;
 
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                        if (index >> s.shift >= 1024)
 
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                        {
 
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                                return null;
 
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                        }
 
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                        while (s != null && s.shift > 0)
 
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                        {
 
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                                int i = index >> s.shift;
 
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                                index -= i << s.shift;
 
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                                s = (RevObjectListBlock)s.contents[i];
 
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                        }
 
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                        return s != null ? (E)s.contents[index] : null;
 
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                }
 
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                public override int Count
 
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                {
 
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                        get
 
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                        {
 
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                                return size;
 
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                        }
 
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                }
 
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                public override void Clear()
 
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                {
 
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                        contents = new RevObjectListBlock(0);
 
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                        size = 0;
 
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                }
 
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        }
 
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        /// <summary>One level of contents, either an intermediate level or a leaf level.</summary>
 
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        /// <remarks>One level of contents, either an intermediate level or a leaf level.</remarks>
 
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        internal class RevObjectListBlock
 
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        {
 
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                internal readonly object[] contents = new object[RevObjectList<RevObject>.BLOCK_SIZE];
 
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                internal readonly int shift;
 
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                internal RevObjectListBlock(int s)
 
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                {
 
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                        shift = s;
 
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                }
 
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        }
 
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}