Package com.evolveum.midpoint.repo.sql.query

Class QueryInterpreter

java.lang.Object

com.evolveum.midpoint.repo.sql.query.QueryInterpreter

public class QueryInterpreter
extends Object

Interprets midPoint queries by translating them to hibernate (HQL) ones.

There are two parts: - filter translation, - paging translation.

As for filter translation, we traverse the filter depth-first, creating an isomorphic structure of Restrictions. While creating them, we continually build a set of entity references that are necessary to evaluate the query; these references are in the form of cartesian join of entities from which each one can have a set of entities connected to it via left outer join. An example:

from RUser u left join u.assignments a with ... left join u.organization o, RRole r left join r.assignments a2 with ...

This structure is maintained in InterpretationContext, namely in the HibernateQuery being prepared. (In order to produce HQL, we use ad-hoc "hibernate query model" in hqm package, rooted in HibernateQuery class.)

Paging translation is done after filters are translated. It may add some entity references as well, if they are not already present.

Author:

lazyman, mederly

Constructor Summary

Constructors

Constructor	Description
QueryInterpreter(SqlRepositoryConfiguration repoConfiguration, ExtItemDictionary extItemDictionary)

Method Summary

Modifier and Type	Method	Description
<T> Matcher<T>	findMatcher(Class<T> type)
<T> Matcher<T>	findMatcher(T value)
RootHibernateQuery	interpret(ObjectQuery query, @NotNull Class<? extends Containerable> type, Collection<SelectorOptions<GetOperationOptions>> options, @NotNull PrismContext prismContext, @NotNull RelationRegistry relationRegistry, boolean countingObjects, @NotNull org.hibernate.Session session)
Condition	interpretFilter(InterpretationContext context, ObjectFilter filter, Restriction parent)

Methods inherited from class java.lang.Object

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

Constructor Detail

QueryInterpreter

public QueryInterpreter(SqlRepositoryConfiguration repoConfiguration,
                        ExtItemDictionary extItemDictionary)

Method Detail

interpret

public RootHibernateQuery interpret(ObjectQuery query,
                                    @NotNull
                                    @NotNull Class<? extends Containerable> type,
                                    Collection<SelectorOptions<GetOperationOptions>> options,
                                    @NotNull
                                    @NotNull PrismContext prismContext,
                                    @NotNull
                                    @NotNull RelationRegistry relationRegistry,
                                    boolean countingObjects,
                                    @NotNull
                                    @NotNull org.hibernate.Session session)
                             throws QueryException

Throws:

QueryException

interpretFilter

public Condition interpretFilter(InterpretationContext context,
                                 ObjectFilter filter,
                                 Restriction parent)
                          throws QueryException

Throws:

QueryException

findMatcher

public <T> Matcher<T> findMatcher(T value)

findMatcher

public <T> Matcher<T> findMatcher(Class<T> type)