org.apache.directory.server.core.partition.impl.btree
Class IndexCursorAdaptor<K,O,ID>

java.lang.Object
  org.apache.directory.server.core.partition.impl.btree.IndexCursorAdaptor<K,O,ID>

All Implemented Interfaces:

java.lang.Iterable<IndexEntry<K,O,ID>>, IndexCursor<K,O,ID>, org.apache.directory.shared.ldap.cursor.Cursor<IndexEntry<K,O,ID>>

public class IndexCursorAdaptor<K,O,ID>
extends java.lang.Object
implements IndexCursor<K,O,ID>

A Cursor which adapts an underlying Tuple based Cursor to one which returns IndexEntry objects rather than tuples.

Version:

$Rev$

Author:

Apache Directory Project

Constructor Summary

IndexCursorAdaptor(org.apache.directory.shared.ldap.cursor.Cursor<Tuple> wrappedCursor, boolean forwardIndex)
Creates an IndexCursorAdaptor which wraps and adapts a Cursor from a table to one which returns an IndexEntry.

Method Summary

void	after(IndexEntry<K,O,ID> element)
void	afterLast()
void	afterValue(ID id, K key) An alternative to calling after(IndexEntry) which often may require wrapping an id and value in a newly created IndexEntry object that may be an unnecessary object creation.
boolean	available()
void	before(IndexEntry<K,O,ID> element)
void	beforeFirst()
void	beforeValue(ID id, K key) An alternative to calling before(IndexEntry) which often may require wrapping an id and value in a newly created IndexEntry object that may be an unnecessary object creation.
void	close()
void	close(java.lang.Exception reason)
boolean	first()
IndexEntry<K,O,ID>	get()
boolean	isClosed()
boolean	isElementReused()
java.util.Iterator<IndexEntry<K,O,ID>>	iterator()
boolean	last()
boolean	next()
boolean	previous()
void	setClosureMonitor(org.apache.directory.shared.ldap.cursor.ClosureMonitor monitor)

Methods inherited from class java.lang.Object

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

Constructor Detail

IndexCursorAdaptor

public IndexCursorAdaptor(org.apache.directory.shared.ldap.cursor.Cursor<Tuple> wrappedCursor,
                          boolean forwardIndex)

Creates an IndexCursorAdaptor which wraps and adapts a Cursor from a table to one which returns an IndexEntry.

Parameters:

wrappedCursor - the Cursor being adapted

forwardIndex - true for a cursor over a forward index, false for one over a reverse index

Method Detail

available

public boolean available()

Specified by:

available in interface org.apache.directory.shared.ldap.cursor.Cursor<IndexEntry<K,O,ID>>

beforeValue

public void beforeValue(ID id,
                        K key)
                 throws java.lang.Exception

Description copied from interface: IndexCursor

An alternative to calling before(IndexEntry) which often may require wrapping an id and value in a newly created IndexEntry object that may be an unnecessary object creation. Some implementations may not support this operation and may throw an UnsupportedOperationEception.

Specified by:

beforeValue in interface IndexCursor<K,O,ID>

Parameters:

id - the id for the entry

key - the value to advance just before

Throws:

java.lang.Exception - if there are faults performing this operation

afterValue

public void afterValue(ID id,
                       K key)
                throws java.lang.Exception

Description copied from interface: IndexCursor

An alternative to calling after(IndexEntry) which often may require wrapping an id and value in a newly created IndexEntry object that may be an unnecessary object creation. Some implementations may not support this operation and may throw an UnsupportedOperationEception.

Specified by:

afterValue in interface IndexCursor<K,O,ID>

Parameters:

id - the id for the entry

key - the value to advance just after the last value

Throws:

java.lang.Exception - if there are faults performing this operation

before

public void before(IndexEntry<K,O,ID> element)
            throws java.lang.Exception

Specified by:

before in interface org.apache.directory.shared.ldap.cursor.Cursor<IndexEntry<K,O,ID>>

Throws:

java.lang.Exception

after

public void after(IndexEntry<K,O,ID> element)
           throws java.lang.Exception

Specified by:

after in interface org.apache.directory.shared.ldap.cursor.Cursor<IndexEntry<K,O,ID>>

Throws:

java.lang.Exception

beforeFirst

public void beforeFirst()
                 throws java.lang.Exception

Specified by:

beforeFirst in interface org.apache.directory.shared.ldap.cursor.Cursor<IndexEntry<K,O,ID>>

Throws:

java.lang.Exception

afterLast

public void afterLast()
               throws java.lang.Exception

Specified by:

afterLast in interface org.apache.directory.shared.ldap.cursor.Cursor<IndexEntry<K,O,ID>>

Throws:

java.lang.Exception

first

public boolean first()
              throws java.lang.Exception

Specified by:

first in interface org.apache.directory.shared.ldap.cursor.Cursor<IndexEntry<K,O,ID>>

Throws:

java.lang.Exception

last

public boolean last()
             throws java.lang.Exception

Specified by:

last in interface org.apache.directory.shared.ldap.cursor.Cursor<IndexEntry<K,O,ID>>

Throws:

java.lang.Exception

isClosed

public boolean isClosed()
                 throws java.lang.Exception

Specified by:

isClosed in interface org.apache.directory.shared.ldap.cursor.Cursor<IndexEntry<K,O,ID>>

Throws:

java.lang.Exception

previous

public boolean previous()
                 throws java.lang.Exception

Specified by:

previous in interface org.apache.directory.shared.ldap.cursor.Cursor<IndexEntry<K,O,ID>>

Throws:

java.lang.Exception

next

public boolean next()
             throws java.lang.Exception

Specified by:

next in interface org.apache.directory.shared.ldap.cursor.Cursor<IndexEntry<K,O,ID>>

Throws:

java.lang.Exception

get

public IndexEntry<K,O,ID> get()
                       throws java.lang.Exception

Specified by:

get in interface org.apache.directory.shared.ldap.cursor.Cursor<IndexEntry<K,O,ID>>

Throws:

java.lang.Exception

isElementReused

public boolean isElementReused()

Specified by:

isElementReused in interface org.apache.directory.shared.ldap.cursor.Cursor<IndexEntry<K,O,ID>>

setClosureMonitor

public final void setClosureMonitor(org.apache.directory.shared.ldap.cursor.ClosureMonitor monitor)

Specified by:

setClosureMonitor in interface org.apache.directory.shared.ldap.cursor.Cursor<IndexEntry<K,O,ID>>

close

public void close()
           throws java.lang.Exception

Specified by:

close in interface org.apache.directory.shared.ldap.cursor.Cursor<IndexEntry<K,O,ID>>

Throws:

java.lang.Exception

close

public void close(java.lang.Exception reason)
           throws java.lang.Exception

Specified by:

close in interface org.apache.directory.shared.ldap.cursor.Cursor<IndexEntry<K,O,ID>>

Throws:

java.lang.Exception

iterator

public java.util.Iterator<IndexEntry<K,O,ID>> iterator()

Specified by:

iterator in interface java.lang.Iterable<IndexEntry<K,O,ID>>