コード例 #1
0
ファイル: ListReader.cs プロジェクト: vlung/Citicenter
        /// <summary>
        /// Reads a list of items from persistent storage. The list is written as a chain of pages,
        /// where the current page stores a pointer to the page storing the next range of items.
        /// The items can be any "serializable" C# type.
        /// </summary>
        /// <param name="stream">data file to read from</param>
        /// <param name="pageIdx">index of the page storing the head of the list</param>
        /// <param name="list">list of items read</param>
        /// <param name="pages">list of physical pages we read from</param>
        public void ReadList(FileStreamWrapper stream, int pageIdx, out List <T> list, out List <int> pages)
        {
            // read pages one by one
            while (ListHdr.EOLPageIndex != pageIdx)
            {
                // read the page data
                StoragePage page     = new StoragePage();
                int         readPage = page.ReadPageData(stream, pageIdx);
                if (readPage != pageIdx)
                {
                    throw new InvalidListException();
                }

                // read the header
                ListHdr header = (ListHdr)page.ReadRecord(ListHdr.HeaderRecordIdx);
                if (null == header)
                {
                    throw new InvalidListException();
                }

                // process the page
                this.ReadCurrentPage(page, header.PageEntriesCount);

                // update the page index
                this.pageList.Add(pageIdx);
                pageIdx = header.NextPageIndex;
            }

            // set the output variables
            list  = this.itemList;
            pages = this.pageList;
        }
コード例 #2
0
ファイル: ListReader.cs プロジェクト: vlung/Citicenter
        private void ReadCurrentPage(StoragePage page, int itemCount)
        {
            for (int idx = 0; idx < (itemCount + 1); idx++)
            {
                if (ListHdr.HeaderRecordIdx == idx)
                {
                    // skip over the header record
                    continue;
                }

                T item = (T)page.ReadRecord(idx);
                this.itemList.Add(item);
            }
        }
コード例 #3
0
ファイル: StoragePageTests.cs プロジェクト: vlung/Citicenter
 private void ReadRecords(StoragePage page, TestData[] data)
 {
     foreach (TestData test in data)
     {
         try
         {
             string result = (string)page.ReadRecord(test.recordIdx);
             Assert.AreEqual(test.data, result,
                             "Read record did not match. Test Data = [{0}]", test.ToString());
         }
         catch (Exception e)
         {
             Assert.AreEqual(test.exception, e.GetType().Name,
                             "Unexpected exception. Test Data = [{0}]", test.ToString());
         }
     }
 }