/*
* 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.
*/
using System;
namespace Lucene.Net.Store
{
/// A memory-resident {@link IndexInput} implementation.
///
///
/// $Id: RAMInputStream.java 150537 2004-09-28 20:45:26Z cutting $
///
class RAMInputStream : BufferedIndexInput, System.ICloneable
{
private RAMFile file;
private long pointer = 0;
private long length;
public RAMInputStream(RAMFile f)
{
file = f;
length = file.length;
}
public override void ReadInternal(byte[] dest, int destOffset, int len)
{
int remainder = len;
long start = pointer;
while (remainder != 0)
{
int bufferNumber = (int) (start / BUFFER_SIZE);
int bufferOffset = (int) (start % BUFFER_SIZE);
int bytesInBuffer = BUFFER_SIZE - bufferOffset;
int bytesToCopy = bytesInBuffer >= remainder?remainder:bytesInBuffer;
byte[] buffer = (byte[]) file.buffers[bufferNumber];
Array.Copy(buffer, bufferOffset, dest, destOffset, bytesToCopy);
destOffset += bytesToCopy;
start += bytesToCopy;
remainder -= bytesToCopy;
}
pointer += len;
}
public override void Close()
{
}
public override void SeekInternal(long pos)
{
pointer = pos;
}
public override long Length()
{
return length;
}
/*
// {{Aroush-1.9}} Do we need this Clone()?!
public override System.Object Clone()
{
SegmentTermEnum clone = null;
try
{
clone = (SegmentTermEnum) base.MemberwiseClone();
}
catch (System.Exception)
{
}
return clone;
}
*/
}
}