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////////////////////////////////////////////////////////////////////////////
//
// Copyright (c) 2010-2021 60East Technologies Inc., All Rights Reserved.
//
// This computer software is owned by 60East Technologies Inc. and is
// protected by U.S. copyright laws and other laws and by international
// treaties. This computer software is furnished by 60East Technologies
// Inc. pursuant to a written license agreement and may be used, copied,
// transmitted, and stored only in accordance with the terms of such
// license agreement and with the inclusion of the above copyright notice.
// This computer software or any other copies thereof may not be provided
// or otherwise made available to any other person.
//
// U.S. Government Restricted Rights. This computer software: (a) was
// developed at private expense and is in all respects the proprietary
// information of 60East Technologies Inc.; (b) was not developed with
// government funds; (c) is a trade secret of 60East Technologies Inc.
// for all purposes of the Freedom of Information Act; and (d) is a
// commercial item and thus, pursuant to Section 12.212 of the Federal
// Acquisition Regulations (FAR) and DFAR Supplement Section 227.7202,
// Government's use, duplication or disclosure of the computer software
// is subject to the restrictions set forth by 60East Technologies Inc..
//
////////////////////////////////////////////////////////////////////////////
package com.crankuptheamps.client;
import com.crankuptheamps.client.fields.Field;
import java.io.IOException;
import java.nio.ByteBuffer;
import com.crankuptheamps.client.BlockPublishStore.ByteSequence;
/**
* MemoryStoreBuffer is a wrapper for a java array that maintains position.
* In order to do this, MemoryStoreBuffer uses a ByteBuffer.
*/
public class MemoryStoreBuffer implements BlockPublishStore.Buffer
{
protected ByteBuffer _buffer = null;
protected Store _store = null;
/**
* Gets the size of the buffer.
* @return The size of the buffer.
* @throws IOException Not thrown from this implementation
*/
public long getSize() throws IOException
{
return _buffer==null?0:this._buffer.capacity();
}
/**
* Sets the size of the buffer.
* @param newSize The new size to be assigned to the buffer.
* @throws IOException Not thrown from this implementation
*/
public void setSize(long newSize) throws IOException
{
if(_buffer==null || newSize > this._buffer.capacity())
{
ByteBuffer b2 = ByteBuffer.allocate((int)newSize);
if(_buffer != null) b2.put(_buffer.array());
_buffer = b2;
}
}
/**
* Gets the current position in the buffer.
* @return The current position in the buffer.
* @throws IOException Not thrown from this implementation
*/
public long getPosition() throws IOException
{
return _buffer.position();
}
/**
* Sets the new current position in the buffer.
* @param position The new current position to be set in the buffer.
* @throws IOException Not thrown from this implementation
*/
public void setPosition(long position) throws IOException
{
_buffer.position((int)position);
}
/**
* Writes the byte in the buffer.
* @param b The byte to be written in the buffer.
* @throws IOException Not thrown from this implementation
*/
public void putByte(byte b) throws IOException
{
_buffer.put(b);
}
/**
* Gets the byte from the buffer.
* @return The byte from the buffer.
* @throws IOException Not thrown from this implementation
*/
public byte getByte() throws IOException
{
return _buffer.get();
}
/**
* Writes the integer into the buffer.
* @param i Integer to be placed in the buffer.
* @throws IOException Not thrown from this implementation
*/
public void putInt(int i) throws IOException
{
_buffer.putInt(i);
}
/**
* Writes the integer into the buffer.
* @param position The location where the integer is placed in the buffer.
* @param i Integer to be placed in the buffer.
* @throws IOException Not thrown from this implementation
*/
public void putInt(long position, int i) throws IOException
{
_buffer.putInt((int)position, i);
}
/**
* Gets the integer from the buffer.
* @return The integer from the buffer.
* @throws IOException Not thrown from this implementation
*/
public int getInt() throws IOException
{
return _buffer.getInt();
}
/**
* Gets the integer from the buffer.
* @param position The position in the buffer where the integer begins.
* @return The integer from the buffer.
* @throws IOException Not thrown from this implementation
*/
public int getInt(long position) throws IOException
{
return _buffer.getInt((int)position);
}
/**
* Writes the long to the buffer.
* @param l The long to write to the buffer.
* @throws IOException Not thrown from this implementation
*/
public void putLong(long l) throws IOException
{
_buffer.putLong(l);
}
/**
* Writes the long to the buffer.
* @param position The position in the buffer where the long should be placed.
* @param l The long to write in the buffer.
* @throws IOException Not thrown from this implementation
*/
public void putLong(long position, long l) throws IOException
{
_buffer.putLong((int)position, l);
}
/**
* Gets the long from the buffer.
* @return The long from the buffer.
* @throws IOException Not thrown from this implementation
*/
public long getLong() throws IOException
{
return _buffer.getLong();
}
/**
* Writes a series of bytes at the current positon, taken from the specified {@link BlockPublishStore.ByteSequence}.
* @param bytes The series of bytes to write at the current position.
* @throws IOException Not thrown from this implementation
*/
public void putBytes(ByteSequence bytes) throws IOException
{
_buffer.put(bytes.array, (int)bytes.offset, (int)bytes.len);
}
/**
* Gets the series of bytes at the current position by placing them into the provided
* {@link BlockPublishStore.ByteSequence} object.
* @param outBytes The ByteSequence object to be copied.
* @throws IOException Not thrown from this implementation
*/
public void getBytes(ByteSequence outBytes) throws IOException
{
if(_buffer.hasArray())
{
outBytes.array = _buffer.array();
outBytes.offset = _buffer.position();
_buffer.position((int)(outBytes.offset + outBytes.len));
}
else
{
outBytes.array = new byte[(int)outBytes.len];
outBytes.offset = 0;
_buffer.get(outBytes.array, 0, (int)outBytes.len);
}
}
/**
* Writes a series of bytes at the current position, taken from a byte array.
* @param buffer The buffer containing a series of bytes.
* @param position The position in the buffer where the series of bytes are located.
* @param length The length of the byte buffer.
* @throws IOException Not thrown from this implementation
*/
public void putBytes(byte[] buffer, long position, long length) throws IOException
{
if (buffer == null || length == 0) return;
_buffer.put(buffer, (int)position, (int)length);
}
/**
* Gets the series of bytes at the current position, this is done by copying them into a {@link Field}
* object.
* @param outField The Field object used to copy the byte sequence.
* @param length The length of the Field object.
* @throws IOException Not thrown from this implementation
*/
public void getBytes(Field outField, int length) throws IOException
{
outField.length = length;
if (outField.length == 0)
{
outField.buffer = null;
outField.position = 0;
}
else if(_buffer.hasArray())
{
outField.buffer = _buffer.array();
outField.position = _buffer.position();
_buffer.position((int)(outField.position + outField.length));
}
else
{
outField.buffer = new byte[outField.length];
outField.position = 0;
_buffer.get(outField.buffer, 0, (int)outField.length);
}
}
/**
* Sets the offset and length of the buffer to 0.
* @param offset The offset to set as 0.
* @param length The length to set as 0.
* @throws IOException Not thrown from this implementation
*/
public void zero(long offset, int length) throws IOException
{
for(long i = 0; i < length; i+=8)
{
_buffer.putLong((int)offset + (int)i, 0);
}
}
public void close() throws Exception
{
_buffer = null;
_store = null;
}
}
