/*
* 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 IndexOutput} implementation.
///
///
/// $Id: RAMOutputStream.java 488330 2006-12-18 16:45:29Z mikemccand $
///
public class RAMOutputStream : BufferedIndexOutput
{
private RAMFile file;
private long pointer = 0;
/// Construct an empty output buffer.
public RAMOutputStream() : this(new RAMFile())
{
}
public /*internal*/ RAMOutputStream(RAMFile f)
{
file = f;
}
/// Copy the current contents of this buffer to the named output.
public virtual void WriteTo(IndexOutput out_Renamed)
{
Flush();
long end = file.length;
long pos = 0;
int buffer = 0;
while (pos < end)
{
int length = BUFFER_SIZE;
long nextPos = pos + length;
if (nextPos > end)
{
// at the last buffer
length = (int) (end - pos);
}
out_Renamed.WriteBytes((byte[]) file.buffers[buffer++], length);
pos = nextPos;
}
}
/// Resets this to an empty buffer.
public virtual void Reset()
{
try
{
Seek(0);
}
catch (System.IO.IOException e)
{
// should never happen
throw new System.SystemException(e.ToString());
}
file.SetLength(0);
}
public override void FlushBuffer(byte[] src, int len)
{
byte[] buffer;
int bufferPos = 0;
while (bufferPos != len)
{
int bufferNumber = (int) (pointer / BUFFER_SIZE);
int bufferOffset = (int) (pointer % BUFFER_SIZE);
int bytesInBuffer = BUFFER_SIZE - bufferOffset;
int remainInSrcBuffer = len - bufferPos;
int bytesToCopy = bytesInBuffer >= remainInSrcBuffer ? remainInSrcBuffer : bytesInBuffer;
if (bufferNumber == file.buffers.Count)
buffer = file.AddBuffer(BUFFER_SIZE);
else
buffer = (byte[]) file.buffers[bufferNumber];
Array.Copy(src, bufferPos, buffer, bufferOffset, bytesToCopy);
bufferPos += bytesToCopy;
pointer += bytesToCopy;
}
if (pointer > file.length)
file.SetLength(pointer);
file.SetLastModified(System.DateTime.Now.Ticks);
}
public override void Close()
{
base.Close();
}
public override void Seek(long pos)
{
base.Seek(pos);
pointer = pos;
}
public override long Length()
{
return file.length;
}
}
}