org.apache.directory.server.core.partition.impl.btree
Class NoDupsEnumeration

java.lang.Object
  org.apache.directory.server.core.partition.impl.btree.NoDupsEnumeration

All Implemented Interfaces:

java.util.Enumeration<Tuple>, javax.naming.NamingEnumeration<Tuple>

public class NoDupsEnumeration
extends java.lang.Object
implements javax.naming.NamingEnumeration<Tuple>

A simple NamingEnumeration over a TupleBrowser on a table that does not allow duplicates.

WARNING: The Tuple returned by this listing is always the same instance object returned every time. It is reused to for the sake of efficency rather than creating a new tuple for each hasMore() call.

Version:

$Rev: 567224 $

Author:

Apache Directory Project

Constructor Summary

NoDupsEnumeration(TupleBrowser browser, boolean doAscendingScan)
Creates a cursor over a TupleBrowser where duplicates are not expected.

Method Summary

void	close() Sets hasNext to false.
boolean	doAscendingScan() Gets the direction of this NamingEnumeration.
boolean	hasMore()
boolean	hasMoreElements() Calls hasMore.
Tuple	next() Returns the same Tuple every time but with different key/value pairs.
Tuple	nextElement() Returns the same Tuple every time but with different key/value pairs.

Methods inherited from class java.lang.Object

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

Constructor Detail

NoDupsEnumeration

public NoDupsEnumeration(TupleBrowser browser,
                         boolean doAscendingScan)
                  throws javax.naming.NamingException

Creates a cursor over a TupleBrowser where duplicates are not expected.

Throws:

javax.naming.NamingException

Method Detail

next

public Tuple next()
           throws javax.naming.NamingException

Returns the same Tuple every time but with different key/value pairs.

Specified by:

next in interface javax.naming.NamingEnumeration<Tuple>

Throws:

javax.naming.NamingException

See Also:

NamingEnumeration.next()

nextElement

public Tuple nextElement()

Returns the same Tuple every time but with different key/value pairs.

Specified by:

nextElement in interface java.util.Enumeration<Tuple>

See Also:

Enumeration.nextElement()

hasMore

public boolean hasMore()

Specified by:

hasMore in interface javax.naming.NamingEnumeration<Tuple>

See Also:

NamingEnumeration.hasMore()

hasMoreElements

public boolean hasMoreElements()

Calls hasMore.

Specified by:

hasMoreElements in interface java.util.Enumeration<Tuple>

See Also:

Enumeration.hasMoreElements()

close

public void close()

Sets hasNext to false.

Specified by:

close in interface javax.naming.NamingEnumeration<Tuple>

See Also:

NamingEnumeration.close()

doAscendingScan

public boolean doAscendingScan()

Gets the direction of this NamingEnumeration.

Returns:

true if this NamingEnumeration is ascending on keys, false otherwise.