org.basex.query.iter
Class NodIter

java.lang.Object
  org.basex.query.iter.Iter
      org.basex.query.iter.NodeIter
          org.basex.query.iter.NodIter

public final class NodIter
extends NodeIter

Simple node Iterator, ignoring duplicates.

Author:

Workgroup DBIS, University of Konstanz 2005-10, ISC License, Christian Gruen

Field Summary

Nod[]	item Items.
int	size Size.

Fields inherited from class org.basex.query.iter.Iter

EMPTY

Constructor Summary

NodIter()
Constructor.

NodIter(boolean d)
Constructor.

NodIter(Nod[] it, int s)
Constructor.

Method Summary

void	add(Nod n) Adds a node.
boolean	contains(DBNode node) Checks if the iterator contains a database node with the specified pre value.
boolean	dbnodes() Checks if binary search can be applied to this iterator, i.e.
void	delete(int p) Deletes a value at the specified position.
Item	finish() Returns a sequence from all iterator values.
Nod	get(int i) Returns the specified node.
Nod	get(long i) Returns the specified item.
Nod	next() Returns the next item or null if no other items are found.
boolean	reset() Resets the iterator and returns true.
int	size() Returns the number of entries.
void	sort(boolean force) Sorts the nodes.
String	toString()

Methods inherited from class org.basex.query.iter.Iter

reverse

Methods inherited from class java.lang.Object

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

Field Detail

item

public Nod[] item

Items.

size

public int size

Size.

Constructor Detail

NodIter

public NodIter()

Constructor.

NodIter

public NodIter(boolean d)

Constructor.

Parameters:

d - returns if the iterator might return duplicates

NodIter

public NodIter(Nod[] it,
               int s)

Constructor.

Parameters:

it - item array

s - size

Method Detail

get

public Nod get(int i)

Returns the specified node.

Parameters:

i - node offset

Returns:

node

delete

public void delete(int p)

Deletes a value at the specified position.

Parameters:

p - deletion position

add

public void add(Nod n)

Adds a node.

Parameters:

n - node to be added

reset

public boolean reset()

Description copied from class: Iter

Resets the iterator and returns true. Note: false is returned if the iterator cannot be reset, so the returned value has to be checked.

Overrides:

reset in class Iter

Returns:

true if operator could be reset

next

public Nod next()

Description copied from class: Iter

Returns the next item or null if no other items are found.

Specified by:

next in class NodeIter

Returns:

resulting item

get

public Nod get(long i)

Description copied from class: Iter

Returns the specified item. Note: null is returned if the item cannot be retrieved, so the returned value has to be checked.

Overrides:

get in class Iter

Parameters:

i - value offset

Returns:

specified item

size

public int size()

Description copied from class: Iter

Returns the number of entries. Note: -1 is returned if the number cannot be retrieved, so the returned value has to be checked. If this method is implemented, Iter.get(long) has to be implemented as well.

Overrides:

size in class Iter

Returns:

number of entries

finish

public Item finish()

Description copied from class: Iter

Returns a sequence from all iterator values. Should be called before Iter.next().

Overrides:

finish in class Iter

Returns:

sequence

dbnodes

public boolean dbnodes()

Checks if binary search can be applied to this iterator, i.e. if all nodes are DBNode references and refer to the same database.

Returns:

result of check

contains

public boolean contains(DBNode node)

Checks if the iterator contains a database node with the specified pre value. All nodes are assumed to be DBNode references and sorted.

Parameters:

node - node to be found

Returns:

result of check

sort

public void sort(boolean force)

Sorts the nodes.

Parameters:

force - force sort

toString

public String toString()

Overrides:

toString in class Object