ucar.unidata.io

Class InMemoryRandomAccessFile

java.lang.Object

ucar.unidata.io.RandomAccessFile

ucar.unidata.io.InMemoryRandomAccessFile

All Implemented Interfaces:

java.io.Closeable, java.io.DataInput, java.io.DataOutput, java.lang.AutoCloseable, ucar.nc2.util.cache.FileCacheable

public class InMemoryRandomAccessFile
extends RandomAccessFile

A RandomAccessFile stored entirely in memory as a byte array.

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	InMemoryRandomAccessFile.Provider Hook for service provider interface RandomAccessFileProvider

Field Summary

Fields inherited from class ucar.unidata.io.RandomAccessFile

BIG_ENDIAN, LITTLE_ENDIAN

Constructor Summary

Constructors

Constructor and Description
InMemoryRandomAccessFile(java.lang.String name, byte[] data) Constructor.

Method Summary

Modifier and Type	Method and Description
long	length() Get the length of the file.
long	readToByteChannel(java.nio.channels.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

acquire, acquire, close, eject, enableDefaultGlobalFileCache, flush, getBufferSize, getFilePointer, getGlobalFileCache, getLastModified, getLocation, getRandomAccessFile, isAtEndOfFile, isDirectory, order, order, read, read, read, readBoolean, readByte, readBytes, readBytes, readChar, readDouble, readDouble, readFloat, readFloat, readFully, readFully, readInt, readInt, readIntUnbuffered, readLine, readLine, readLong, readLong, readShort, readShort, readString, readString, readStringMax, readStringMax, readUnsignedByte, readUnsignedShort, readUTF, searchForward, seek, setExtendMode, setGlobalFileCache, setMinLength, shutdown, skipBytes, skipBytes, toString, unread, write, write, write, writeBoolean, writeBoolean, writeByte, writeBytes, writeBytes, writeBytes, writeChar, writeChar, writeChar, writeChar, writeChar, writeChar, writeChars, writeChars, writeChars, writeDouble, writeDouble, writeDouble, writeDouble, writeDouble, writeDouble, writeFloat, writeFloat, writeFloat, writeFloat, writeFloat, writeFloat, writeInt, writeInt, writeInt, writeInt, writeInt, writeInt, writeLong, writeLong, writeLong, writeLong, writeLong, writeLong, writeShort, writeShort, writeShort, writeShort, writeShort, writeShort, writeUTF

Methods inherited from class java.lang.Object

equals, getClass, hashCode, notify, notifyAll, wait, wait, wait

Methods inherited from interface ucar.nc2.util.cache.FileCacheable

reacquire, release, setFileCache

Constructor Detail

InMemoryRandomAccessFile

public InMemoryRandomAccessFile(java.lang.String name,
                                byte[] data)

Constructor.

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.

readToByteChannel

public long readToByteChannel(java.nio.channels.WritableByteChannel dest,
                              long offset,
                              long nbytes)
                       throws java.io.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:

java.io.IOException - if an I/O error occurs.

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