fiftyone.mobile.detection.readers

Class TrieReader

java.lang.Object

fiftyone.mobile.detection.readers.TrieReader

public class TrieReader
extends Object

Due to the size of the Trie tree structure, the data cannot fit into a single ByteBuffer. Therefore, this class is used to wrap the file channel and and become logically one channel.

Constructor Summary

Constructors

Constructor and Description
TrieReader(FileChannel reader) Creates the class by creating multiple ByteBuffers that can be read from.

Method Summary

Modifier and Type	Method and Description
void	close() Clears the ByteBuffers and closes the File Channel.
long	getPos() Returns the current logical position value.
byte	readByte()
byte[]	readBytes(int length)
int	readInt() Read an signed integer from the file at the current location.
long	readLong() Read an signed long from the file at the current location.
long	readLong(long position) Read an signed long from the file at a specified location.
short	readUByte() Read an Unsigned byte from the file at the current location.
short	readUByte(long position) Read an Unsigned byte from the file at a specified location.
long	readUInt() Read an Unsigned integer from the file at the current location.
int	readUShort() Read an Unsigned short from the file at the current location.
int	readUShort(long position) Read an Unsigned short from the file at a specified location.
void	setPos(long position) Sets the logical position in the file.

Methods inherited from class java.lang.Object

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

Constructor Detail

TrieReader

public TrieReader(FileChannel reader)
           throws IOException

Creates the class by creating multiple ByteBuffers that can be read from.

Parameters:

reader - File channel to read from.

Throws:

IOException - indicates an I/O exception occurred

Method Detail

getPos

public long getPos()

Returns the current logical position value.

Returns:

the current logical position in the file.

setPos

public void setPos(long position)

Sets the logical position in the file.

Parameters:

position - position value.

readUByte

public short readUByte()

Read an Unsigned byte from the file at the current location.

Returns:

The value read.

readUByte

public short readUByte(long position)

Read an Unsigned byte from the file at a specified location.

Parameters:

position - Position to read from.

Returns:

The value read.

readUShort

public int readUShort()

Read an Unsigned short from the file at the current location.

Returns:

The value read.

readUShort

public int readUShort(long position)

Read an Unsigned short from the file at a specified location.

Parameters:

position - Position to read from.

Returns:

The value read.

readUInt

public long readUInt()
              throws IOException

Read an Unsigned integer from the file at the current location.

Returns:

The Value read.

Throws:

IOException - indicates an I/O exception occurred

readInt

public int readInt()
            throws IOException

Read an signed integer from the file at the current location.

Returns:

The Value read.

Throws:

IOException - indicates an I/O exception occurred

readLong

public long readLong()

Read an signed long from the file at the current location.

Returns:

The Value read.

readLong

public long readLong(long position)
              throws IOException

Read an signed long from the file at a specified location.

Parameters:

position - Position to read from.

Returns:

The value read.

Throws:

IOException - indicates an I/O exception occurred

readByte

public byte readByte()

readBytes

public byte[] readBytes(int length)

close

public void close()
           throws IOException

Clears the ByteBuffers and closes the File Channel.

Throws:

IOException - indicates an I/O exception occurred