com.hp.hpl.jena.graph.compose
Class CompositionBase

java.lang.Object
  com.hp.hpl.jena.graph.impl.GraphBase
      com.hp.hpl.jena.graph.compose.CompositionBase

All Implemented Interfaces:

Graph

Direct Known Subclasses:

Dyadic, Polyadic

public abstract class CompositionBase

extends com.hp.hpl.jena.graph.impl.GraphBase

Base class for graphs that are composed of multiple sub-graphs. This is to provide a home for shared functionality that was previously in Dyadic before refactoring.

Version:

CVS $Id: CompositionBase.java,v 1.3 2003/07/11 10:16:10 chris-dollin Exp $

Author:

Ian Dickinson, moved kers' code from Dyadic to this class, added commentage, Chris Dollin (kers)

Field Summary

Fields inherited from interface com.hp.hpl.jena.graph.Graph

ADD, DELETE, ORDERED, SIZE

Constructor Summary

CompositionBase()

Method Summary

static ClosableIterator	butNot(ClosableIterator a, ClosableIterator b) Answer an iterator over the elements of iterator a that are not members of iterator b.
boolean	contains(Triple t) Answer true if the given triple occurs at least once in this graph.
static int	countIterator(ClosableIterator i) Answer the number of items in the closable iterator i.
static Filter	ifIn(ClosableIterator i) Answer a Filter that will accept any object that is an element of iterator i.
static Filter	ifIn(Graph g) Answer a Filter that will accept any triple that is an edge of graph g.
static ExtendedIterator	recording(ClosableIterator i, java.util.Set seen) Answer an iterator that will record every element delived by next() in the set seen.
static Filter	reject(ClosableIterator i) Answer a Filter that will reject any element that is a member of iterator i.
static ExtendedIterator	rejecting(ExtendedIterator i, java.util.Set seen) Answer an iterator over the elements of iterator i that are not in the set seen.
int	size() Answer the number of triples in this graph

Methods inherited from class com.hp.hpl.jena.graph.impl.GraphBase

add, capabilities, close, contains, delete, dependsOn, find, find, getBulkUpdateHandler, getCapabilities, getEventManager, getPrefixMapping, getReifier, getTransactionHandler, isIsomorphicWith, notifyAdd, notifyDelete, performAdd, performDelete, queryHandler, toString, withReification

Methods inherited from class java.lang.Object

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

Constructor Detail

CompositionBase

public CompositionBase()

Method Detail

size

public int size()

Answer the number of triples in this graph

Returns:

The integer triple count

See Also:

Graph.size()

contains

public boolean contains(Triple t)

Answer true if the given triple occurs at least once in this graph.

Parameters:

t - A triple to test

Returns:

True if t is an edge of this graph

See Also:

Graph.contains(Triple)

reject

public static Filter reject(ClosableIterator i)

Answer a Filter that will reject any element that is a member of iterator i. As a side-effect, i will be closed.

Parameters:

i - A closable iterator

Returns:

A Filter that will accept any object not a member of i.

butNot

public static ClosableIterator butNot(ClosableIterator a,
                                      ClosableIterator b)

Answer an iterator over the elements of iterator a that are not members of iterator b. As a side-effect, iterator b will be closed.

Parameters:

a - An iterator that will be filtered by rejecting the elements of b

b - A closable iterator

Returns:

The iteration of elements in a but not in b.

recording

public static ExtendedIterator recording(ClosableIterator i,
                                         java.util.Set seen)

Answer an iterator that will record every element delived by next() in the set seen.

Parameters:

i - A closable iterator

seen - A set that will record each element of i in turn

Returns:

An iterator that records the elements of i.

rejecting

public static ExtendedIterator rejecting(ExtendedIterator i,
                                         java.util.Set seen)

Answer an iterator over the elements of iterator i that are not in the set seen.

Parameters:

i - An extended iterator

seen - A set of objects

Returns:

An iterator over the elements of i that are not in the set seen.

countIterator

public static int countIterator(ClosableIterator i)

Answer the number of items in the closable iterator i. As a side effect, i is closed.

Parameters:

i - A closable iterator

Returns:

The number of elements of i

ifIn

public static Filter ifIn(ClosableIterator i)

Answer a Filter that will accept any object that is an element of iterator i. As a side-effect, i will be evaluated and closed.

Parameters:

i - A closable iterator

Returns:

A Filter that will accept any object in iterator i.

ifIn

public static Filter ifIn(Graph g)

Answer a Filter that will accept any triple that is an edge of graph g.

Parameters:

g - A graph

Returns:

A Filter that will accept any triple that is an edge in g.