public override void  GetTermFreqVector(int docNumber, TermVectorMapper mapper)
		{
			EnsureOpen();

            System.Collections.IEnumerator i = new System.Collections.Hashtable(fieldToReader).GetEnumerator();
			while (i.MoveNext())
			{
				System.Collections.DictionaryEntry e = (System.Collections.DictionaryEntry) i.Current;
				System.String field = (System.String) e.Key;
				IndexReader reader = (IndexReader) e.Value;
				reader.GetTermFreqVector(docNumber, field, mapper);
			}
		}

 public override void GetTermFreqVector(int docNumber, TermVectorMapper mapper)
 {
     EnsureOpen();
     int i = ReaderIndex(docNumber); // find segment num
     subReaders[i].GetTermFreqVector(docNumber - starts[i], mapper);
 }

		public override void  GetTermFreqVector(int docNumber, TermVectorMapper mapper)
		{
			EnsureOpen();
			in_Renamed.GetTermFreqVector(docNumber, mapper);
		}

		public override void  GetTermFreqVector(int docNumber, TermVectorMapper mapper)
		{
			EnsureOpen();
			
			TermVectorsReader termVectorsReader = GetTermVectorsReader();
			if (termVectorsReader == null)
				return ;
			
			termVectorsReader.Get(docNumber, mapper);
		}

		public override void  GetTermFreqVector(int docNumber, TermVectorMapper mapper)
		{
			EnsureOpen();

            foreach(var e in fieldToReader)
			{
				System.String field = e.Key;
				IndexReader reader = e.Value;
				reader.GetTermFreqVector(docNumber, field, mapper);
			}
		}

		/// <summary> </summary>
		/// <param name="field">The field to read in
		/// </param>
		/// <param name="tvfPointer">The pointer within the tvf file where we should start reading
		/// </param>
		/// <param name="mapper">The mapper used to map the TermVector
		/// </param>
		/// <returns> The TermVector located at that position
		/// </returns>
		/// <throws>  IOException </throws>
		private void  ReadTermVector(System.String field, long tvfPointer, TermVectorMapper mapper)
		{
			
			// Now read the data from specified position
			//We don't need to offset by the FORMAT here since the pointer already includes the offset
			tvf.Seek(tvfPointer);
			
			int numTerms = tvf.ReadVInt();
			//System.out.println("Num Terms: " + numTerms);
			// If no terms - return a constant empty termvector. However, this should never occur!
			if (numTerms == 0)
				return ;
			
			bool storePositions;
			bool storeOffsets;
			
			if (tvfFormat == FORMAT_VERSION)
			{
				byte bits = tvf.ReadByte();
				storePositions = (bits & STORE_POSITIONS_WITH_TERMVECTOR) != 0;
				storeOffsets = (bits & STORE_OFFSET_WITH_TERMVECTOR) != 0;
			}
			else
			{
				tvf.ReadVInt();
				storePositions = false;
				storeOffsets = false;
			}
			mapper.SetExpectations(field, numTerms, storeOffsets, storePositions);
			int start = 0;
			int deltaLength = 0;
			int totalLength = 0;
			char[] buffer = new char[10]; // init the buffer with a length of 10 character
			char[] previousBuffer = new char[]{};
			
			for (int i = 0; i < numTerms; i++)
			{
				start = tvf.ReadVInt();
				deltaLength = tvf.ReadVInt();
				totalLength = start + deltaLength;
				if (buffer.Length < totalLength)
				{
					// increase buffer
					buffer = null; // give a hint to garbage collector
					buffer = new char[totalLength];
					
					if (start > 0)
					// just copy if necessary
						Array.Copy(previousBuffer, 0, buffer, 0, start);
				}
				
				tvf.ReadChars(buffer, start, deltaLength);
				System.String term = new System.String(buffer, 0, totalLength);
				previousBuffer = buffer;
				int freq = tvf.ReadVInt();
				int[] positions = null;
				if (storePositions)
				{
					//read in the positions
					//does the mapper even care about positions?
					if (mapper.IsIgnoringPositions() == false)
					{
						positions = new int[freq];
						int prevPosition = 0;
						for (int j = 0; j < freq; j++)
						{
							positions[j] = prevPosition + tvf.ReadVInt();
							prevPosition = positions[j];
						}
					}
					else
					{
						//we need to skip over the positions.  Since these are VInts, I don't believe there is anyway to know for sure how far to skip
						//
						for (int j = 0; j < freq; j++)
						{
							tvf.ReadVInt();
						}
					}
				}
				TermVectorOffsetInfo[] offsets = null;
				if (storeOffsets)
				{
					//does the mapper even care about offsets?
					if (mapper.IsIgnoringOffsets() == false)
					{
						offsets = new TermVectorOffsetInfo[freq];
						int prevOffset = 0;
						for (int j = 0; j < freq; j++)
						{
//.........这里部分代码省略.........

		private void  ReadTermVectors(System.String[] fields, long[] tvfPointers, TermVectorMapper mapper)
		{
			for (int i = 0; i < fields.Length; i++)
			{
				ReadTermVector(fields[i], tvfPointers[i], mapper);
			}
		}

		/// <summary> </summary>
		/// <param name="field">The field to read in
		/// </param>
		/// <param name="tvfPointer">The pointer within the tvf file where we should start reading
		/// </param>
		/// <param name="mapper">The mapper used to map the TermVector
		/// </param>
		/// <throws>  IOException </throws>
		private void  ReadTermVector(System.String field, long tvfPointer, TermVectorMapper mapper)
		{
			
			// Now read the data from specified position
			//We don't need to offset by the FORMAT here since the pointer already includes the offset
			tvf.Seek(tvfPointer);
			
			int numTerms = tvf.ReadVInt();
			//System.out.println("Num Terms: " + numTerms);
			// If no terms - return a constant empty termvector. However, this should never occur!
			if (numTerms == 0)
				return ;
			
			bool storePositions;
			bool storeOffsets;
			
			if (format >= FORMAT_VERSION)
			{
				byte bits = tvf.ReadByte();
				storePositions = (bits & STORE_POSITIONS_WITH_TERMVECTOR) != 0;
				storeOffsets = (bits & STORE_OFFSET_WITH_TERMVECTOR) != 0;
			}
			else
			{
				tvf.ReadVInt();
				storePositions = false;
				storeOffsets = false;
			}
			mapper.SetExpectations(field, numTerms, storeOffsets, storePositions);
			int start = 0;
			int deltaLength = 0;
			int totalLength = 0;
			byte[] byteBuffer;
			char[] charBuffer;
			bool preUTF8 = format < FORMAT_UTF8_LENGTH_IN_BYTES;
			
			// init the buffers
			if (preUTF8)
			{
				charBuffer = new char[10];
				byteBuffer = null;
			}
			else
			{
				charBuffer = null;
				byteBuffer = new byte[20];
			}
			
			for (int i = 0; i < numTerms; i++)
			{
				start = tvf.ReadVInt();
				deltaLength = tvf.ReadVInt();
				totalLength = start + deltaLength;
				
				System.String term;
				
				if (preUTF8)
				{
					// Term stored as java chars
					if (charBuffer.Length < totalLength)
					{
						char[] newCharBuffer = new char[(int) (1.5 * totalLength)];
						Array.Copy(charBuffer, 0, newCharBuffer, 0, start);
						charBuffer = newCharBuffer;
					}
					tvf.ReadChars(charBuffer, start, deltaLength);
					term = new System.String(charBuffer, 0, totalLength);
				}
				else
				{
					// Term stored as utf8 bytes
					if (byteBuffer.Length < totalLength)
					{
						byte[] newByteBuffer = new byte[(int) (1.5 * totalLength)];
						Array.Copy(byteBuffer, 0, newByteBuffer, 0, start);
						byteBuffer = newByteBuffer;
					}
					tvf.ReadBytes(byteBuffer, start, deltaLength);
                    term = System.Text.Encoding.UTF8.GetString(byteBuffer, 0, totalLength);
				}
				int freq = tvf.ReadVInt();
				int[] positions = null;
				if (storePositions)
				{
					//read in the positions
					//does the mapper even care about positions?
					if (mapper.IsIgnoringPositions() == false)
					{
						positions = new int[freq];
						int prevPosition = 0;
						for (int j = 0; j < freq; j++)
						{
//.........这里部分代码省略.........

		public virtual void  Get(int docNumber, TermVectorMapper mapper)
		{
			// Check if no term vectors are available for this segment at all
			if (tvx != null)
			{
				//We need to offset by
				
				SeekTvx(docNumber);
				long tvdPosition = tvx.ReadLong();
				
				tvd.Seek(tvdPosition);
				int fieldCount = tvd.ReadVInt();
				
				// No fields are vectorized for this document
				if (fieldCount != 0)
				{
					System.String[] fields = ReadFields(fieldCount);
					long[] tvfPointers = ReadTvfPointers(fieldCount);
					mapper.SetDocumentNumber(docNumber);
					ReadTermVectors(fields, tvfPointers, mapper);
				}
			}
			else
			{
				//System.out.println("No tvx file");
			}
		}

 /// <summary> Load the Term Vector into a user-defined data structure instead of relying on the parallel arrays of
 /// the {@link TermFreqVector}.
 /// </summary>
 /// <param name="docNumber">The number of the document to load the vector for
 /// </param>
 /// <param name="field">The name of the field to load
 /// </param>
 /// <param name="mapper">The {@link TermVectorMapper} to process the vector.  Must not be null
 /// </param>
 /// <throws>  IOException if term vectors cannot be accessed or if they do not exist on the field and doc. specified. </throws>
 /// <summary> 
 /// </summary>
 public abstract void GetTermFreqVector(int docNumber, string field, TermVectorMapper mapper);

		/// <summary> Load the Term Vector into a user-defined data structure instead of relying on the parallel arrays of
		/// the {@link TermFreqVector}.
		/// </summary>
		/// <param name="docNumber">The number of the document to load the vector for
		/// </param>
		/// <param name="field">The name of the field to load
		/// </param>
		/// <param name="mapper">The {@link TermVectorMapper} to process the vector.  Must not be null
		/// </param>
		/// <throws>  IOException if term vectors cannot be accessed or if they do not exist on the field and doc. specified. </throws>
		/// <summary> 
		/// </summary>
		abstract public void  GetTermFreqVector(int docNumber, System.String field, TermVectorMapper mapper);

		public virtual void  Get(int docNumber, TermVectorMapper mapper)
		{
			// Check if no term vectors are available for this segment at all
			if (tvx != null)
			{
				//We need to offset by
				tvx.Seek((docNumber * 8L) + FORMAT_SIZE);
				long position = tvx.ReadLong();
				
				tvd.Seek(position);
				int fieldCount = tvd.ReadVInt();
				
				// No fields are vectorized for this document
				if (fieldCount != 0)
				{
					int number = 0;
					System.String[] fields = new System.String[fieldCount];
					
					for (int i = 0; i < fieldCount; i++)
					{
						if (tvdFormat == FORMAT_VERSION)
							number = tvd.ReadVInt();
						else
							number += tvd.ReadVInt();
						
						fields[i] = fieldInfos.FieldName(number);
					}
					
					// Compute position in the tvf file
					position = 0;
					long[] tvfPointers = new long[fieldCount];
					for (int i = 0; i < fieldCount; i++)
					{
						position += tvd.ReadVLong();
						tvfPointers[i] = position;
					}
					
					mapper.SetDocumentNumber(docNumber);
					ReadTermVectors(fields, tvfPointers, mapper);
				}
			}
			else
			{
				//System.out.println("No tvx file");
			}
		}