org.aksw.jena_sparql_api.concept_cache.op

Class OpUtils

java.lang.Object

org.aksw.jena_sparql_api.concept_cache.op.OpUtils

public class OpUtils
extends Object

Constructor Summary

Constructors

Constructor and Description
OpUtils()

Method Summary

Methods

Modifier and Type	Method and Description
static org.aksw.jena_sparql_api.concept_cache.op.OpSummary	createSummary(com.hp.hpl.jena.sparql.algebra.Op op)
static List<com.hp.hpl.jena.sparql.algebra.Op>	getSubOps(com.hp.hpl.jena.sparql.algebra.Op op)
static <K,V> void	increment(Map<K,V> map, K key)
static boolean	isEquivalent(com.hp.hpl.jena.sparql.algebra.Op a, com.hp.hpl.jena.sparql.algebra.Op b)
static boolean	isPatternFree(com.hp.hpl.jena.sparql.algebra.Op op) Traverses an op structure in order to determine whether it contains any concrete triple or quad patterns.
static Map<com.hp.hpl.jena.sparql.algebra.Op,com.hp.hpl.jena.sparql.algebra.Op>	parentMap(com.hp.hpl.jena.sparql.algebra.Op rootOp) Traverse an op structure and create a map from each subOp to its immediate parent NOTE It must be ensured that common sub expressions are different objects, since we are using an identity hash map for mapping children to parents
static void	parentMap(com.hp.hpl.jena.sparql.algebra.Op op, Map<com.hp.hpl.jena.sparql.algebra.Op,com.hp.hpl.jena.sparql.algebra.Op> result)
static Map<String,Object>	summarize(com.hp.hpl.jena.sparql.algebra.Op op)
static void	summarize(com.hp.hpl.jena.sparql.algebra.Op op, Map<String,Object> result)

Methods inherited from class java.lang.Object

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

Constructor Detail

OpUtils

public OpUtils()

Method Detail

createSummary

public static org.aksw.jena_sparql_api.concept_cache.op.OpSummary createSummary(com.hp.hpl.jena.sparql.algebra.Op op)

summarize

public static Map<String,Object> summarize(com.hp.hpl.jena.sparql.algebra.Op op)

increment

public static <K,V> void increment(Map<K,V> map,
                   K key)

summarize

public static void summarize(com.hp.hpl.jena.sparql.algebra.Op op,
             Map<String,Object> result)

isEquivalent

public static boolean isEquivalent(com.hp.hpl.jena.sparql.algebra.Op a,
                   com.hp.hpl.jena.sparql.algebra.Op b)

parentMap

public static Map<com.hp.hpl.jena.sparql.algebra.Op,com.hp.hpl.jena.sparql.algebra.Op> parentMap(com.hp.hpl.jena.sparql.algebra.Op rootOp)

Traverse an op structure and create a map from each subOp to its immediate parent NOTE It must be ensured that common sub expressions are different objects, since we are using an identity hash map for mapping children to parents

Parameters:

op -

Returns:

parentMap

public static void parentMap(com.hp.hpl.jena.sparql.algebra.Op op,
             Map<com.hp.hpl.jena.sparql.algebra.Op,com.hp.hpl.jena.sparql.algebra.Op> result)

getSubOps

public static List<com.hp.hpl.jena.sparql.algebra.Op> getSubOps(com.hp.hpl.jena.sparql.algebra.Op op)

isPatternFree

public static boolean isPatternFree(com.hp.hpl.jena.sparql.algebra.Op op)

Traverses an op structure in order to determine whether it contains any concrete triple or quad patterns. If no such pattern is found, the query is independent of a dataset and hence it can be evaluated e.g. against an empty in-memory model.

Parameters:

op -

Returns: