org.apache.jena.graph.impl

Class CollectionGraph

java.lang.Object

org.apache.jena.graph.impl.GraphBase

org.apache.jena.graph.impl.CollectionGraph

All Implemented Interfaces:

Graph, GraphWithPerform

public class CollectionGraph
extends GraphBase

A simple graph implementation that wraps a collection of triples. This is intended to be used in places where a graph is required but iteration is the only expected operation. All graph operations are supported but many are not efficient and will be slow on large collections. In these cases a memory based graph will be more efficient.

This implementation:

• Does not support deleting triples from the iterator
• Does not handle literal typing

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 and Description
CollectionGraph() Construct an empty graph using an empty HashSet.
CollectionGraph(Collection<Triple> triples) Construct a graph from a collection.
CollectionGraph(Collection<Triple> triples, boolean iteratorDeleteAllowed) Construct a graph from a collection.

Method Summary

Modifier and Type	Method and Description
Capabilities	getCapabilities() Answer the capabilities of this graph; the default is an AllCapabilities object (the same one each time, not that it matters - Capabilities should be immutable).
void	performAdd(Triple t) Add a triple to the triple store.
void	performDelete(Triple t) Remove a triple from the triple store.

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

add, clear, close, contains, contains, delete, dependsOn, find, find, forTestingOnly_graphBaseFind, getEventManager, getPrefixMapping, getStatisticsHandler, getTransactionHandler, isClosed, isEmpty, isIsomorphicWith, notifyAdd, notifyDelete, 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

find

Constructor Detail

CollectionGraph

public CollectionGraph()

Construct an empty graph using an empty HashSet. Iterator deletion is supported.

CollectionGraph

public CollectionGraph(Collection<Triple> triples)

Construct a graph from a collection. Iterator deletion is not supported.

Parameters:

triples - The collection of triples.

CollectionGraph

public CollectionGraph(Collection<Triple> triples,
                       boolean iteratorDeleteAllowed)

Construct a graph from a collection.

Parameters:

triples - The collection of triples.

iteratorDeleteAllowed - if true iterator on triple supports deletion and we want to enable iterator deletion.

Method Detail

performAdd

public void performAdd(Triple t)

Description copied from class: GraphBase

Add a triple to the triple store. The default implementation throws an AddDeniedException; subclasses must override if they want to be able to add triples.

Specified by:

performAdd in interface GraphWithPerform

Overrides:

performAdd in class GraphBase

performDelete

public void performDelete(Triple t)

Description copied from class: GraphBase

Remove a triple from the triple store. The default implementation throws a DeleteDeniedException; subclasses must override if they want to be able to remove triples.

Specified by:

performDelete in interface GraphWithPerform

Overrides:

performDelete in class GraphBase

getCapabilities

public Capabilities getCapabilities()

Description copied from class: GraphBase

Answer the capabilities of this graph; the default is an AllCapabilities object (the same one each time, not that it matters - Capabilities should be immutable).

Specified by:

getCapabilities in interface Graph

Overrides:

getCapabilities in class GraphBase