org.openrdf.repository.util
Class RepositoryUtil

java.lang.Object
  org.openrdf.repository.util.RepositoryUtil

public class RepositoryUtil
extends Object

Utility methods for comparing sets of statements (graphs) with each other. The supplied comparison operations map bnodes in the two supplied models on to each other and thus define a graph isomorphism.

Author:

jeen, Arjohn Kampman

Constructor Summary

RepositoryUtil()

Method Summary

static Collection<? extends Statement>	difference(Collection<? extends Statement> model1, Collection<? extends Statement> model2) Compares two models, defined by two statement collections, and returns the difference between the first and the second model (that is, all statements that are present in model1 but not in model2).
static Collection<? extends Statement>	difference(Repository rep1, Repository rep2) Compares two models defined by the default context of two repositories and returns the difference between the first and the second model (that is, all statements that are present in rep1 but not in rep2).
static boolean	equals(Repository rep1, Repository rep2) Compares the models in the default contexts of the two supplied repositories and returns true if they are equal.
static boolean	isSubset(Repository rep1, Repository rep2) Compares the models of the default context of two repositories and returns true if rep1 is a subset of rep2.

Methods inherited from class java.lang.Object

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

Constructor Detail

RepositoryUtil

public RepositoryUtil()

Method Detail

equals

public static boolean equals(Repository rep1,
                             Repository rep2)
                      throws RepositoryException

Compares the models in the default contexts of the two supplied repositories and returns true if they are equal. Models are equal if they contain the same set of statements. bNodes IDs are not relevant for model equality, they are mapped from one model to the other by using the attached properties. Note that the method pulls the entire default context of both repositories into main memory. Use with caution.

Throws:

RepositoryException

isSubset

public static boolean isSubset(Repository rep1,
                               Repository rep2)
                        throws RepositoryException

Compares the models of the default context of two repositories and returns true if rep1 is a subset of rep2. Note that the method pulls the entire default context of both repositories into main memory. Use with caution.

Throws:

RepositoryException

difference

public static Collection<? extends Statement> difference(Repository rep1,
                                                         Repository rep2)
                                                  throws RepositoryException

Compares two models defined by the default context of two repositories and returns the difference between the first and the second model (that is, all statements that are present in rep1 but not in rep2). Blank node IDs are not relevant for model equality, they are mapped from one model to the other by using the attached properties. Note that the method pulls the entire default context of both repositories into main memory. Use with caution.

NOTE: this algorithm is currently broken; it doesn't actually map blank nodes between the two models.

Returns:

The collection of statements that is the difference between rep1 and rep2.

Throws:

RepositoryException

difference

public static Collection<? extends Statement> difference(Collection<? extends Statement> model1,
                                                         Collection<? extends Statement> model2)

Compares two models, defined by two statement collections, and returns the difference between the first and the second model (that is, all statements that are present in model1 but not in model2). Blank node IDs are not relevant for model equality, they are mapped from one model to the other by using the attached properties. *

NOTE: this algorithm is currently broken; it doesn't actually map blank nodes between the two models.

Returns:

The collection of statements that is the difference between model1 and model2.