ucar.unidata.io

Class InMemoryRandomAccessFile

java.lang.Object

ucar.unidata.io.RandomAccessFile

ucar.unidata.io.InMemoryRandomAccessFile

All Implemented Interfaces:

DataInput, DataOutput, FileCacheable

public class InMemoryRandomAccessFile
extends RandomAccessFile

A RandomAccessFile stored entirely in memory as a byte array.

Author:

john

Field Summary

Fields inherited from class ucar.unidata.io.RandomAccessFile

allFiles, BIG_ENDIAN, bigEndian, buffer, bufferStart, dataEnd, dataSize, debugAccess, debugLeaks, defaultBufferSize, endOfFile, file, fileCache, fileChannel, filePosition, LITTLE_ENDIAN, location, openFiles, readonly, showOpen, showRead

Constructor Summary

Constructors

Constructor and Description
InMemoryRandomAccessFile(String name, byte[] data) A RandomAccessFile stored entirely in memory as a byte array.

Method Summary

Methods

Modifier and Type	Method and Description
long	length() Get the length of the file.
protected int	read_(long pos, byte[] b, int offset, int len) Read directly from file, without going through the buffer.
long	readToByteChannel(WritableByteChannel dest, long offset, long nbytes) Read nbytes bytes, at the specified file offset, send to a WritableByteChannel.
void	setBufferSize(int bufferSize) Set the buffer size.

Methods inherited from class ucar.unidata.io.RandomAccessFile

close, flush, getAllFiles, getBufferSize, getDebugLeaks, getDebugNbytes, getDebugNseeks, getFilePointer, getLastModified, getLocation, getOpenFiles, getRandomAccessFile, isAtEndOfFile, order, order, read, read, read, readBoolean, readBuffer, readByte, readBytes, readBytes, readChar, readDouble, readDouble, readFloat, readFloat, readFully, readFully, readInt, readInt, readIntUnbuffered, readLine, readLong, readLong, readShort, readShort, readString, readUnsignedByte, readUnsignedShort, readUTF, searchForward, seek, setDebugAccess, setDebugLeaks, setExtendMode, setFileCache, setMinLength, skipBytes, skipBytes, toString, unread, write, write, write, writeBoolean, writeBoolean, writeByte, writeBytes, writeBytes, writeBytes, writeChar, writeChar, writeChars, writeDouble, writeDouble, writeFloat, writeFloat, writeInt, writeInt, writeLong, writeLong, writeShort, writeShort, writeUTF

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Constructor Detail

InMemoryRandomAccessFile

public InMemoryRandomAccessFile(String name,
                        byte[] data)

A RandomAccessFile stored entirely in memory as a byte array.

Parameters:

name - used as the location

data - the complete data file

Method Detail

length

public long length()

Description copied from class: RandomAccessFile

Get the length of the file. The data in the buffer (which may not have been written the disk yet) is taken into account.

Overrides:

length in class RandomAccessFile

Returns:

the length of the file in bytes.

setBufferSize

public void setBufferSize(int bufferSize)

Description copied from class: RandomAccessFile

Set the buffer size. If writing, call flush() first.

Overrides:

setBufferSize in class RandomAccessFile

Parameters:

bufferSize - length in bytes

read_

protected int read_(long pos,
        byte[] b,
        int offset,
        int len)
             throws IOException

Description copied from class: RandomAccessFile

Read directly from file, without going through the buffer. All reading goes through here or readToByteChannel;

Overrides:

read_ in class RandomAccessFile

Parameters:

pos - start here in the file

b - put data into this buffer

offset - buffer offset

len - this number of bytes

Returns:

actual number of bytes read

Throws:

IOException - on io error

readToByteChannel

public long readToByteChannel(WritableByteChannel dest,
                     long offset,
                     long nbytes)
                       throws IOException

Description copied from class: RandomAccessFile

Read nbytes bytes, at the specified file offset, send to a WritableByteChannel. This will block until all bytes are read. This uses the underlying file channel directly, bypassing all user buffers.

Overrides:

readToByteChannel in class RandomAccessFile

Parameters:

dest - write to this WritableByteChannel.

offset - the offset in the file where copying will start.

nbytes - the number of bytes to read.

Returns:

the actual number of bytes read and transfered

Throws:

IOException - if an I/O error occurs.