Package org.ehrbase.openehr.aqlengine.pathanalysis

Class PathCohesionAnalysis

java.lang.Object

org.ehrbase.openehr.aqlengine.pathanalysis.PathCohesionAnalysis

public final class PathCohesionAnalysis
extends Object

Cohesion of attribute paths

Given an object type that has several attributes and a query that selects those attributes, the result list must not contain a combination of values from different ("not same") objects.

Constrained ATTRIBUTEs

In Archetypes and Templates the content of attributes of type ATTRIBUTE can be constrained. Effectively each constraint, identified by its node_id, constitutes a sub-attribute of the base attribute. ARCHETYPE_SLOT or ARCHETYPE_ROOT constraints also possess a node_id, but in the object representation the archetype_node_id features the archetype id, instead. Since multiple ARCHETYPE_SLOT and ARCHETYPE_ROOT constraints may allow the same archetype_id, it may not be sufficient to identify a specific sub-attribute. In this case, name/value can be used as additional identification criterion. Other predicates are merely acting as filters.

If multiple paths target the same base attribute, it must be determined at which resolution attributes are indicated:

1. attribute without identifying predicates: If present, a base attribute is indicated: Identifying predicates in other paths at as filters
2. name/value: if all paths (only) have name/value predicates, they induce sub-attributes. Otherwise, a base attribute is indicated.
3. node_id: name/value acts as filter
4. archetype_id: if a path with a certain archetype_id has no name/value predicate, name/value of other paths with the same archetype_id act as filter
5. archetype_id + name/value: identifies a sub-attribute

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static class	PathCohesionAnalysis.PathCohesionTreeNode

Method Summary

Modifier and Type	Method	Description
static Map<org.ehrbase.openehr.sdk.aql.dto.containment.AbstractContainmentExpression,PathCohesionAnalysis.PathCohesionTreeNode>	analyzePathCohesion(org.ehrbase.openehr.sdk.aql.dto.AqlQuery query)	For each containment expression that is referenced in the query, the paths are analyzed and a tree of its attributes is returned.

Methods inherited from class java.lang.Object

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

Method Details

analyzePathCohesion

public static Map<org.ehrbase.openehr.sdk.aql.dto.containment.AbstractContainmentExpression,PathCohesionAnalysis.PathCohesionTreeNode> analyzePathCohesion(org.ehrbase.openehr.sdk.aql.dto.AqlQuery query)

For each containment expression that is referenced in the query, the paths are analyzed and a tree of its attributes is returned.

Parameters:

query -

Returns: