Module org.apache.jena.core

Package org.apache.jena.graph.compose

Class CompositionBase

java.lang.Object

org.apache.jena.graph.impl.GraphBase

org.apache.jena.graph.compose.CompositionBase

All Implemented Interfaces:

Graph, GraphWithPerform

Direct Known Subclasses:

Delta, Dyadic, Polyadic

public abstract class CompositionBase
extends 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.

Field Summary

Fields inherited from class org.apache.jena.graph.impl.GraphBase

TOSTRING_TRIPLE_BASE, TOSTRING_TRIPLE_LIMIT

Fields inherited from interface org.apache.jena.graph.Graph

emptyGraph

Constructor Summary

Constructors

Constructor	Description
CompositionBase()

Method Summary

Modifier and Type	Method	Description
static <T> ClosableIterator<T>	butNot(ClosableIterator<T> a, ClosableIterator<? extends T> b)	Answer an iterator over the elements of iterator a that are not members of iterator b.
static Predicate<Triple>	ifIn(Graph g)	Answer a Predicate that will accept any triple that is an edge of graph g.
static <T> Predicate<T>	ifIn(ClosableIterator<T> i)	Answer a Predicate that will accept any object that is an element of iterator i.
static <T> ExtendedIterator<T>	recording(ClosableIterator<T> i, Set<T> seen)	Answer an iterator that will record every element delived by next() in the set seen.
static <T> Predicate<T>	reject(ClosableIterator<? extends T> i)	Answer a Predicate that will reject any element that is a member of iterator i.
static ExtendedIterator<Triple>	rejecting(ExtendedIterator<Triple> i, Set<Triple> seen)	Answer an iterator over the elements of iterator i that are not in the set seen.
static ExtendedIterator<Triple>	rejecting(ExtendedIterator<Triple> i, Graph seen)	Answer an iterator over the elements of i that are not in the graph seen.

Methods inherited from class org.apache.jena.graph.impl.GraphBase

add, clear, close, contains, contains, delete, dependsOn, find, find, forTestingOnly_graphBaseFind, getEventManager, getPrefixMapping, getTransactionHandler, isClosed, isEmpty, isIsomorphicWith, notifyAdd, notifyDelete, performAdd, performDelete, remove, size, toString, toString

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.apache.jena.graph.Graph

add, delete, find, getCapabilities, sizeLong, stream, stream

Constructor Details

CompositionBase

public CompositionBase()

Method Details

reject

public static <T> Predicate<T> reject(ClosableIterator<? extends T> i)

Answer a Predicate 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 Predicate that will accept any object not a member of i.

butNot

public static <T> ClosableIterator<T> butNot(ClosableIterator<T> a,
 ClosableIterator<? extends T> 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 <T> ExtendedIterator<T> recording(ClosableIterator<T> i,
 Set<T> 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<Triple> rejecting(ExtendedIterator<Triple> i,
 Set<Triple> 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.

rejecting

public static ExtendedIterator<Triple> rejecting(ExtendedIterator<Triple> i,
 Graph seen)

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

ifIn

public static <T> Predicate<T> ifIn(ClosableIterator<T> i)

Answer a Predicate 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 Predicate that will accept any object in iterator i.

ifIn

public static Predicate<Triple> ifIn(Graph g)

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

Parameters:

g - A graph

Returns:

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