prefuse.data.tuple
Class TupleManager

java.lang.Object
  prefuse.data.tuple.TupleManager

public class TupleManager
extends java.lang.Object

Manager class for Tuples. There is a unique Tuple for each row of a table. All data structures and Tuples are created lazily, on an as-needed basis. When a row is deleted from the table, it's corresponding Tuple (if created) is invalidated before being removed from this data structure, ensuring that any other live references to the Tuple can't be used to corrupt the table.

Author:

jeffrey heer

Nested Class Summary

class

TupleManager.TupleManagerIterator Iterator instance for iterating over tuples managed in a TupleManager.

Field Summary

protected Graph	m_graph
protected Table	m_table
protected java.lang.Class	m_tupleType

Constructor Summary

TupleManager(Table t, Graph g, java.lang.Class tupleType)
Create a new TupleManager for the given Table.

Method Summary

Tuple	getTuple(int row) Get a Tuple corresponding to the given row index.
java.lang.Class	getTupleType() Get the type of Tuple instances to generate.
void	init(Table t, Graph g, java.lang.Class tupleType) Initialize this TupleManager for use with a given Table.
void	invalidate(int row) Invalidate the tuple at the given row.
void	invalidateAll() Invalidate all tuples managed by this TupleManager
java.util.Iterator	iterator(IntIterator rows) Return an iterator over the tuples in this manager.
protected TableTuple	newTuple(int row) Instantiate a new Tuple instance for the given row index.

Methods inherited from class java.lang.Object

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

Field Detail

m_graph

protected Graph m_graph

m_table

protected Table m_table

m_tupleType

protected java.lang.Class m_tupleType

Constructor Detail

TupleManager

public TupleManager(Table t,
                    Graph g,
                    java.lang.Class tupleType)

Create a new TupleManager for the given Table.

Parameters:

t - the data Table to generate Tuples for

Method Detail

init

public void init(Table t,
                 Graph g,
                 java.lang.Class tupleType)

Initialize this TupleManager for use with a given Table.

Parameters:

t - the data Table to generate Tuples for

getTupleType

public java.lang.Class getTupleType()

Get the type of Tuple instances to generate.

Returns:

the tuple type, as a Class instance

getTuple

public Tuple getTuple(int row)

Get a Tuple corresponding to the given row index.

Parameters:

row - the row index

Returns:

the Tuple corresponding to the given row

newTuple

protected TableTuple newTuple(int row)

Instantiate a new Tuple instance for the given row index.

Parameters:

row - the row index of the tuple

Returns:

the newly created Tuple

invalidate

public void invalidate(int row)

Invalidate the tuple at the given row.

Parameters:

row - the row index to invalidate

invalidateAll

public void invalidateAll()

Invalidate all tuples managed by this TupleManager

iterator

public java.util.Iterator iterator(IntIterator rows)

Return an iterator over the tuples in this manager.

Parameters:

rows - an iterator over table rows

Returns:

an iterator over the tuples indicated by the input row iterator