org.cumulus4j.store.query
Class QueryHelper

java.lang.Object
  org.cumulus4j.store.query.QueryHelper

public class QueryHelper
extends Object

Helper methods for querying.

Constructor Summary

QueryHelper()

Method Summary

static Set<Long>	getAllDataEntryIdsForCandidate(PersistenceManager pmData, ExecutionContext ec, Class candidateCls, boolean subclasses) Access the data entry ids for a candidate.
static List<Object>	getAllPersistentObjectsForCandidateClasses(PersistenceManager pmData, ExecutionContext ec, Set<ClassMeta> candidateClassMetas) Convenience method to return the persistent objects for the classes with the provided ClassMetas.
static Set<ClassMeta>	getCandidateClassMetas(Cumulus4jStoreManager storeMgr, ExecutionContext ec, Class<?> candidateClass, boolean withSubclasses) Convenience method to return the ClassMeta objects for the specified class (and subclasses if required).

Methods inherited from class java.lang.Object

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

Constructor Detail

QueryHelper

public QueryHelper()

Method Detail

getAllDataEntryIdsForCandidate

public static Set<Long> getAllDataEntryIdsForCandidate(PersistenceManager pmData,
                                                       ExecutionContext ec,
                                                       Class candidateCls,
                                                       boolean subclasses)

Access the data entry ids for a candidate.

Parameters:

pmData - PersistenceManager for the backend data

ec - ExecutionContext

candidateCls - Candidate class

subclasses - Whether to include subclasses

Returns:

The data entry ids

getAllPersistentObjectsForCandidateClasses

public static List<Object> getAllPersistentObjectsForCandidateClasses(PersistenceManager pmData,
                                                                      ExecutionContext ec,
                                                                      Set<ClassMeta> candidateClassMetas)

Convenience method to return the persistent objects for the classes with the provided ClassMetas.

Parameters:

pmData - PersistenceManager for the backend data

ec - ExecutionContext

candidateClassMetas - The class metas defining the required classes

Returns:

The persistent objects

getCandidateClassMetas

public static Set<ClassMeta> getCandidateClassMetas(Cumulus4jStoreManager storeMgr,
                                                    ExecutionContext ec,
                                                    Class<?> candidateClass,
                                                    boolean withSubclasses)

Convenience method to return the ClassMeta objects for the specified class (and subclasses if required).

Parameters:

storeMgr - Cumulus4J StoreManager

ec - ExecutionContext

candidateClass - The class required

withSubclasses - Whether to return subclasses too

Returns:

The ClassMeta objects