BN089-BS开发框架MVC4版/source20131023/Zephyr.Net/Zephyr.Utils/Document/Excel/NPOI/POIFS/FileSystem/BlockStore.cs

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/* ====================================================================
   Licensed to the Apache Software Foundation (ASF) under one or more
   contributor license agreements.  See the NOTICE file distributed with
   this work for additional information regarding copyright ownership.
   The ASF licenses this file to You under the Apache License, Version 2.0
   (the "License"); you may not use this file except in compliance with
   the License.  You may obtain a copy of the License at

       http://www.apache.org/licenses/LICENSE-2.0

   Unless required by applicable law or agreed to in writing, software
   distributed under the License is distributed on an "AS IS" BASIS,
   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   See the License for the specific language governing permissions and
   limitations under the License.
==================================================================== */

namespace Zephyr.Utils.NPOI.POIFS.FileSystem
{
    using System;
    using Zephyr.Utils.NPOI.POIFS.Storage;
    using Zephyr.Utils.NPOI.POIFS.NIO;
    using Zephyr.Utils.NPOI.Util;

    /// <summary>
    /// This abstract class describes a way to read, store, chain
    /// and free a series of blocks (be they Big or Small ones)
    /// </summary>
    public abstract class BlockStore
    {
        /// <summary>
        /// Returns the size of the blocks managed through the block store.
        /// </summary>
        /// <returns></returns>
        public abstract int GetBlockStoreBlockSize();


        /// <summary>
        /// Load the block at the given offset.
        /// </summary>
        /// <param name="offset"></param>
        /// <returns></returns>
        public abstract ByteBuffer GetBlockAt(int offset);
        /// <summary>
        /// Extends the file if required to hold blocks up to
        /// the specified offset, and return the block from there.
        /// </summary>
        /// <param name="offset"></param>
        /// <returns></returns>
        public abstract ByteBuffer CreateBlockIfNeeded(int offset);
        /// <summary>
        /// Returns the BATBlock that handles the specified offset,
        /// and the relative index within it
        /// </summary>
        /// <param name="offset"></param>
        /// <returns></returns>
        public abstract BATBlockAndIndex GetBATBlockAndIndex(int offset);

        /// <summary>