jdbm.recman

Class BlockIo

java.lang.Object

jdbm.recman.BlockIo

All Implemented Interfaces:

Externalizable, Serializable

public final class BlockIo
extends Object
implements Externalizable

This class wraps a page-sized byte array and provides methods to read and write data to and from it. The readers and writers are just the ones that the rest of the toolkit needs, nothing else. Values written are compatible with java.io routines. This block is never accessed directly, so it does not have to be thread-safe.

See Also:

DataInput, DataOutput, Serialized Form

Field Summary

Fields

Modifier and Type	Field and Description
static long	serialVersionUID

Constructor Summary

Constructors

Constructor and Description
BlockIo() Default constructor for serialization

Method Summary

Methods

Modifier and Type	Method and Description
BlockView	getView()
byte	readByte(int pos) Reads a byte from the indicated position
void	readExternal(ObjectInput in) implement externalizable interface
int	readInt(int pos) Reads an int from the indicated position
long	readLong(int pos) Reads a long from the indicated position
short	readShort(int pos) Reads a short from the indicated position
void	setView(BlockView view) Sets the current view of the block.
String	toString()
void	writeByte(int pos, byte value) Writes a byte to the indicated position
void	writeExternal(ObjectOutput out) implement externalizable interface
void	writeInt(int pos, int value) Writes an int to the indicated position
void	writeLong(int pos, long value) Writes a long to the indicated position
void	writeShort(int pos, short value) Writes a short to the indicated position

Methods inherited from class java.lang.Object

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

Field Detail

serialVersionUID

public static final long serialVersionUID

See Also:

Constant Field Values

Constructor Detail

BlockIo

public BlockIo()

Default constructor for serialization

Method Detail

getView

public BlockView getView()

Returns:

the current view of the block.

setView

public void setView(BlockView view)

Sets the current view of the block.

Parameters:

view - the current view

readByte

public byte readByte(int pos)

Reads a byte from the indicated position

Parameters:

pos - the position at which we will read the byte

Returns:

the read byte

writeByte

public void writeByte(int pos,
             byte value)

Writes a byte to the indicated position

Parameters:

pos - The position where we want to write the value to

value - the byte value we want to write into the BlockIo

readShort

public short readShort(int pos)

Reads a short from the indicated position

Parameters:

pos - the position at which we will read the short

Returns:

the read short

writeShort

public void writeShort(int pos,
              short value)

Writes a short to the indicated position

Parameters:

pos - The position where we want to write the value to

value - the short value we want to write into the BlockIo

readInt

public int readInt(int pos)

Reads an int from the indicated position

Parameters:

pos - the position at which we will read the int

Returns:

the read int

writeInt

public void writeInt(int pos,
            int value)

Writes an int to the indicated position

Parameters:

pos - The position where we want to write the value to

value - the int value we want to write into the BlockIo

readLong

public long readLong(int pos)

Reads a long from the indicated position

Parameters:

pos - the position at which we will read the long

Returns:

the read long

writeLong

public void writeLong(int pos,
             long value)

Writes a long to the indicated position

Parameters:

pos - The position where we want to write the value to

value - the long value we want to write into the BlockIo

toString

public String toString()

Overrides:

toString in class Object

readExternal

public void readExternal(ObjectInput in)
                  throws IOException,
                         ClassNotFoundException

implement externalizable interface

Specified by:

readExternal in interface Externalizable

Throws:

IOException

ClassNotFoundException

writeExternal

public void writeExternal(ObjectOutput out)
                   throws IOException

implement externalizable interface

Specified by:

writeExternal in interface Externalizable

Throws:

IOException