org.apache.cassandra.utils.btree

Class Cursor<V>

java.lang.Object

org.apache.cassandra.utils.btree.Cursor<V>

Type Parameters:

V -

All Implemented Interfaces:

java.util.Iterator<V>

public final class Cursor<V>
extends java.lang.Object
implements java.util.Iterator<V>

An extension of Path which provides a public interface for iterating over or counting a subrange of the tree

Method Summary

Methods

Modifier and Type	Method and Description
int	count()
boolean	hasNext()
V	next()
void	remove()
void	reset(java.lang.Object[] btree, boolean forwards) Reset this cursor for the provided tree, to iterate over its entire range
void	reset(java.lang.Object[] btree, java.util.Comparator<V> comparator, V lowerBound, boolean inclusiveLowerBound, V upperBound, boolean inclusiveUpperBound, boolean forwards) Reset this cursor for the provided tree, to iterate between the provided start and end
void	reset(java.lang.Object[] btree, java.util.Comparator<V> comparator, V lowerBound, V upperBound, boolean forwards) Reset this cursor for the provided tree, to iterate between the provided start and end

Methods inherited from class java.lang.Object

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

Method Detail

reset

public void reset(java.lang.Object[] btree,
         boolean forwards)

Reset this cursor for the provided tree, to iterate over its entire range

Parameters:

btree - the tree to iterate over

forwards - if false, the cursor will start at the end and move backwards

reset

public void reset(java.lang.Object[] btree,
         java.util.Comparator<V> comparator,
         V lowerBound,
         V upperBound,
         boolean forwards)

Reset this cursor for the provided tree, to iterate between the provided start and end

Parameters:

btree - the tree to iterate over

comparator - the comparator that defines the ordering over the items in the tree

lowerBound - the first item to include, inclusive

upperBound - the last item to include, exclusive

forwards - if false, the cursor will start at the end and move backwards

reset

public void reset(java.lang.Object[] btree,
         java.util.Comparator<V> comparator,
         V lowerBound,
         boolean inclusiveLowerBound,
         V upperBound,
         boolean inclusiveUpperBound,
         boolean forwards)

Reset this cursor for the provided tree, to iterate between the provided start and end

Parameters:

btree - the tree to iterate over

comparator - the comparator that defines the ordering over the items in the tree

lowerBound - the first item to include

inclusiveLowerBound - should include start in the iterator, if present in the tree

upperBound - the last item to include

inclusiveUpperBound - should include end in the iterator, if present in the tree

forwards - if false, the cursor will start at the end and move backwards

hasNext

public boolean hasNext()

Specified by:

hasNext in interface java.util.Iterator<V>

next

public V next()

Specified by:

next in interface java.util.Iterator<V>

count

public int count()

remove

public void remove()

Specified by:

remove in interface java.util.Iterator<V>