| using Lucene.Net.Store; |
| using System; |
| using System.IO; |
| |
| namespace Lucene.Net.Replicator |
| { |
| /* |
| * 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. |
| */ |
| |
| /// <summary> |
| /// A <see cref="Stream"/> which wraps an <see cref="IndexInput"/>. |
| /// </summary> |
| /// <remarks> |
| /// @lucene.experimental |
| /// </remarks> |
| public class IndexInputStream : Stream |
| { |
| private readonly IndexInput input; |
| |
| public IndexInputStream(IndexInput input) |
| { |
| this.input = input; |
| } |
| |
| public override void Flush() |
| { |
| throw new InvalidOperationException("Cannot flush a readonly stream."); |
| } |
| |
| public override long Seek(long offset, SeekOrigin origin) |
| { |
| switch (origin) |
| { |
| case SeekOrigin.Begin: |
| Position = offset; |
| break; |
| case SeekOrigin.Current: |
| Position += offset; |
| break; |
| case SeekOrigin.End: |
| Position = Length - offset; |
| break; |
| } |
| return Position; |
| } |
| |
| public override void SetLength(long value) |
| { |
| throw new InvalidOperationException("Cannot change length of a readonly stream."); |
| } |
| |
| public override int Read(byte[] buffer, int offset, int count) |
| { |
| int remaining = (int) (input.Length - input.GetFilePointer()); |
| int readCount = Math.Min(remaining, count); |
| input.ReadBytes(buffer, offset, readCount); |
| return readCount; |
| } |
| |
| public override void Write(byte[] buffer, int offset, int count) |
| { |
| throw new InvalidCastException("Cannot write to a readonly stream."); |
| } |
| |
| public override bool CanRead => true; |
| public override bool CanSeek => true; |
| public override bool CanWrite => false; |
| public override long Length => input.Length; |
| |
| public override long Position |
| { |
| get => input.GetFilePointer(); |
| set => input.Seek(value); |
| } |
| |
| protected override void Dispose(bool disposing) |
| { |
| if (disposing) |
| { |
| input.Dispose(); |
| } |
| base.Dispose(disposing); |
| } |
| } |
| } |