org.hypergraphdb.query.cond2qry

Class QEManip

java.lang.Object

org.hypergraphdb.query.cond2qry.QEManip

public class QEManip
extends Object

Constructor Summary

Constructors

Constructor and Description
QEManip()

Method Summary

Methods

Modifier and Type	Method and Description
static <T extends HGQueryCondition> T	collapse(HyperGraph graph, Set<HGQueryCondition> S)
static Map<Class<?>,Set<HGQueryCondition>>	find(Collection<HGQueryCondition> C, Class<?>... condType) Collect and group different types of conditions in map.
static HGHandle	findMostSpecific(HyperGraph graph, HGHandle left, HGHandle right)
static Pair<AtomTypeCondition,TypeConditionAggregate>	reduce(HyperGraph graph, Set<TypeCondition> bytype) Return the one true type condition out of a conjunction of multiple conditions that constrain by type in one way or another.

Methods inherited from class java.lang.Object

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

Constructor Detail

QEManip

public QEManip()

Method Detail

findMostSpecific

public static HGHandle findMostSpecific(HyperGraph graph,
                        HGHandle left,
                        HGHandle right)

collapse

public static <T extends HGQueryCondition> T collapse(HyperGraph graph,
                                      Set<HGQueryCondition> S)

reduce

public static Pair<AtomTypeCondition,TypeConditionAggregate> reduce(HyperGraph graph,
                                                    Set<TypeCondition> bytype)

Return the one true type condition out of a conjunction of multiple conditions that constrain by type in one way or another. The method returns null if no type is actually specified already (this means all type conditions in the passed in set are using variables). If there is an inconsistency b/w two type conditions so that the result set should be really empty, the method returns and AtomTypeCondition with a null reference (i.e. "no type possible").

Parameters:

graph -

bytype -

Returns:

find

public static Map<Class<?>,Set<HGQueryCondition>> find(Collection<HGQueryCondition> C,
                                       Class<?>... condType)

Collect and group different types of conditions in map. The method takes any number of condition Class-es and return a map Class->Set. The test is done using the Class.isAssignableFrom so a given condition could end in multiple map entries if some of the Class arguments inherit from each other. If no condition of a specified Class is found, the map won't contain an entry for that class at all.

Parameters:

C -

condType -

Returns: