iterator
Class SpoofIbuf

java.lang.Object
  iterator.SpoofIbuf

All Implemented Interfaces:

GlobalConst

public class SpoofIbuf

extends java.lang.Object

implements GlobalConst

Field Summary

Fields inherited from interface global.GlobalConst

INVALID_PAGE, MAX_NAME, MAX_SPACE, MAXATTRNAME, MAXFILENAME, MAXINDEXNAME, MINIBASE_BUFFER_POOL_SIZE, MINIBASE_DB_SIZE, MINIBASE_DEFAULT_SHAREDMEM_SIZE, MINIBASE_MAX_TRANSACTIONS, MINIBASE_MAXARRSIZE, MINIBASE_PAGESIZE, NUMBUF

Constructor Summary

SpoofIbuf()

Method Summary

boolean	empty()
Tuple	Get(Tuple buf) get a tuple from current buffer,pass reference buf to this method usage:temp_tuple = tuple.Get(buf);
void	init(Heapfile fd, byte[][] bufs, int n_pages, int tSize, int Ntuples) Initialize some necessary inormation, call Iobuf to create the object, and call init to finish intantiation
void	SpoofIbuf() constructor, use the init to initialize

Methods inherited from class java.lang.Object

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

Constructor Detail

SpoofIbuf

public SpoofIbuf()

Method Detail

SpoofIbuf

public void SpoofIbuf()

constructor, use the init to initialize

init

public void init(Heapfile fd,
                 byte[][] bufs,
                 int n_pages,
                 int tSize,
                 int Ntuples)
          throws java.io.IOException,
                 java.lang.Exception

Initialize some necessary inormation, call Iobuf to create the object, and call init to finish intantiation

Parameters:

n_pages - the numbers of page of this buffer

tSize - the tuple size

fd - the reference to an Heapfile

Ntuples - the tuple numbers of the page

Throws:

java.io.IOException - some I/O fault

java.lang.Exception - other exceptions

Get

public Tuple Get(Tuple buf)
          throws java.io.IOException,
                 java.lang.Exception

get a tuple from current buffer,pass reference buf to this method usage:temp_tuple = tuple.Get(buf);

Parameters:

buf - write the result to buf

Returns:

the result tuple

Throws:

java.io.IOException - some I/O fault

java.lang.Exception - other exceptions

empty

public boolean empty()

Returns:

if the buffer is empty,return true. otherwise false