com.franz.util

Class Util

java.lang.Object

com.franz.util.Util

public final class Util
extends Object

Various static utility functions.

Method Summary

Modifier and Type	Method and Description
static int	compare(int[] a, int[] b) Compares two array lexicographically.
static String	getCatalogFromSpec(String repoAndCatalog) Parses a store spec of the form [CATALOG:]REPO and returns the CATALOG.
static String	getRepoFromSpec(String repoAndCatalog) Parses a store spec of the form [CATALOG:]REPO and returns the REPO part.
static <T> Iterable<T>	iter(Iteration<T,? extends RuntimeException> i) Converts an RDF4J iteration object into a Java iterable.
static int	mismatch(int[] a, int[] b) Computes the first index where two arrays differ.

Methods inherited from class java.lang.Object

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

Method Detail

iter

public static <T> Iterable<T> iter(Iteration<T,? extends RuntimeException> i)

Converts an RDF4J iteration object into a Java iterable.

Note that the 'iterable' can be iterated over only once. The purpose of this method is to enable RDF4J iterable objects to be used in for-each loops:

try (TupleQueryResult result = ...) { for (BindingSet set : Util.iter(result)) { ... } }

Type Parameters:

T - Type of objects returned from the iteration.

Parameters:

i - RDF4J iterable object.

Returns:

An iterable to be used in a for-each loop.

getCatalogFromSpec

public static String getCatalogFromSpec(String repoAndCatalog)

Parses a store spec of the form [CATALOG:]REPO and returns the CATALOG. Returns null if there is no CATALOG.

Parameters:

repoAndCatalog - Store specification ([CATALOG:]REPO).

Returns:

Catalog name or null.

getRepoFromSpec

public static String getRepoFromSpec(String repoAndCatalog)

Parses a store spec of the form [CATALOG:]REPO and returns the REPO part.

Parameters:

repoAndCatalog - Store specification ([CATALOG:]REPO).

Returns:

Repository name.

mismatch

public static int mismatch(int[] a,
                           int[] b)

Computes the first index where two arrays differ. If the arrays are identical -1 is returned. If one array is a prefix of the other then the length of the shorter array is returned.

Parameters:

a - First array.

b - Second array.

Returns:

First differing index or -1.

Throws:

NullPointerException - If either array is null.

compare

public static int compare(int[] a,
                          int[] b)

Compares two array lexicographically.

Parameters:

a - First array.

b - Second array.

Returns:

Comparison result as specified by Comparable.compareTo(Object).

Throws:

NullPointerException - If either array is null.