/*
* Copyright 2004 The Apache Software Foundation
*
* Licensed 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{
/// <summary> A memory-resident {@link IndexInput} implementation.
///
/// </summary>
/// <version> $Id: RAMInputStream.java 150537 2004-09-28 20:45:26Z cutting $
/// </version>
class RAMInputStream : BufferedIndexInput, System.ICloneable
{
private RAMFile file;
private int 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;
int start = pointer;
while (remainder != 0)
{
int bufferNumber = start / BUFFER_SIZE;
int bufferOffset = 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 = (int) 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;
}
*/
}
}
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