org.aksw.sparqlify.database

Class PrefixMapStoreAccessor

java.lang.Object

org.aksw.sparqlify.database.PrefixMapStoreAccessor

public class PrefixMapStoreAccessor
extends Object

Accessor for a NavigableMap, Object> We separate the accessor from the store, in order to avoid duplicating (referenences to) the index metadata at each node of the index tree - this way there is just one accessor with the metadata, which can work on any corresponding store at some level in an hierarchical index.

Author:

Claus Stadler

Field Summary

Fields

Modifier and Type	Field and Description
static Set<Class<?>>	supportedConstraintClasses

Constructor Summary

Constructors

Constructor and Description
PrefixMapStoreAccessor(int[] indexColumns, org.apache.commons.collections15.Transformer<Object,Set<String>> prefixExtractor)

Method Summary

Methods

Modifier and Type	Method and Description
Object	createStore() Create a new store that can be used with this accessor
Object	get(NavigableMap<String,Object> map, List<Object> row)
Object	get(Object store, List<Object> row)
Set<Class<?>>	getSupportedConstraintClasses()
Collection<Object>	list(Object store)
Collection<Object>	lookup(NavigableMap<String,Object> map, EqualsConstraint constraint)
Collection<Object>	lookup(NavigableMap<String,Object> map, IsPrefixOfConstraint constraint)
Collection<Object>	lookup(NavigableMap<String,Object> map, StartsWithConstraint constraint)
Collection<Object>	lookup(Object store, Constraint constraint) The constraints given as arguments are interpreted as conjunctions.
void	put(NavigableMap<String,Object> map, List<?> row, Object value)
void	put(Object store, List<?> row, Object value) We assume that .

Methods inherited from class java.lang.Object

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

Field Detail

supportedConstraintClasses

public static Set<Class<?>> supportedConstraintClasses

Constructor Detail

PrefixMapStoreAccessor

public PrefixMapStoreAccessor(int[] indexColumns,
                      org.apache.commons.collections15.Transformer<Object,Set<String>> prefixExtractor)

Method Detail

getSupportedConstraintClasses

public Set<Class<?>> getSupportedConstraintClasses()

put

public void put(Object store,
       List<?> row,
       Object value)

We assume that . only classes that are in supportedConstraintClasses are passed to this method. . only constraints for which the index has the right columns are passed This method should only be used by the engine

Parameters:

constraints -

put

public void put(NavigableMap<String,Object> map,
       List<?> row,
       Object value)

lookup

public Collection<Object> lookup(Object store,
                        Constraint constraint)

The constraints given as arguments are interpreted as conjunctions. The set of prefixes within a constraint is interpreted as a disjunction.

Parameters:

constraints -

lookup

public Collection<Object> lookup(NavigableMap<String,Object> map,
                        EqualsConstraint constraint)

lookup

public Collection<Object> lookup(NavigableMap<String,Object> map,
                        StartsWithConstraint constraint)

lookup

public Collection<Object> lookup(NavigableMap<String,Object> map,
                        IsPrefixOfConstraint constraint)

get

public Object get(Object store,
         List<Object> row)

get

public Object get(NavigableMap<String,Object> map,
         List<Object> row)

list

public Collection<Object> list(Object store)

createStore

public Object createStore()

Create a new store that can be used with this accessor

Returns: