de.lmu.ifi.dbs.elki.index.tree
Interface Node<E extends Entry>

Type Parameters:

E - the type of Entry used in the index

All Superinterfaces:

Externalizable, Page, Serializable

All Known Subinterfaces:

SpatialNode<N,E>

All Known Implementing Classes:

AbstractMTreeNode, AbstractNode, AbstractRStarTreeNode, DeLiCluNode, MkAppTreeNode, MkCoPTreeNode, MkMaxTreeNode, MkTabTreeNode, MTreeNode, RStarTreeNode

public interface Node<E extends Entry>
extends Page

This interface defines the common requirements of nodes in an index structure. A node has to extend the page interface for persistent storage and has to provide an enumeration over its children.

Method Summary

int	addDirectoryEntry(E entry) Adds a new directory entry to this node's children and returns the index of the entry in this node's children array.
int	addLeafEntry(E entry) Adds a new leaf entry to this node's children and returns the index of the entry in this node's children array.
Enumeration<IndexTreePath<E>>	children(IndexTreePath<E> parentPath) Returns an enumeration of the children paths of this node.
E	getEntry(int index) Returns the entry at the specified index.
int	getNumEntries() Returns the number of entries of this node.
boolean	isLeaf() Returns true if this node is a leaf node, false otherwise.

Methods inherited from interface de.lmu.ifi.dbs.elki.persistent.Page

getPageID, isDirty, setDirty, setPageID

Methods inherited from interface java.io.Externalizable

readExternal, writeExternal

Method Detail

children

Enumeration<IndexTreePath<E>> children(IndexTreePath<E> parentPath)

Returns an enumeration of the children paths of this node.

Parameters:

parentPath - the path to this node

Returns:

an enumeration of the children paths of this node

getNumEntries

int getNumEntries()

Returns the number of entries of this node.

Returns:

the number of entries of this node

isLeaf

boolean isLeaf()

Returns true if this node is a leaf node, false otherwise.

Returns:

true if this node is a leaf node, false otherwise

getEntry

E getEntry(int index)

Returns the entry at the specified index.

Parameters:

index - the index of the entry to be returned

Returns:

the entry at the specified index

addLeafEntry

int addLeafEntry(E entry)

Adds a new leaf entry to this node's children and returns the index of the entry in this node's children array. An UnsupportedOperationException will be thrown if the entry is not a leaf entry or this node is not a leaf node.

Parameters:

entry - the leaf entry to be added

Returns:

the index of the entry in this node's children array

Throws:

UnsupportedOperationException - if entry is not a leaf entry or this node is not a leaf node

addDirectoryEntry

int addDirectoryEntry(E entry)

Adds a new directory entry to this node's children and returns the index of the entry in this node's children array. An UnsupportedOperationException will be thrown if the entry is not a directory entry or this node is not a directory node.

Parameters:

entry - the directory entry to be added

Returns:

the index of the entry in this node's children array

Throws:

UnsupportedOperationException - if entry is not a directory entry or this node is not a directory node