org.datanucleus.store.rdbms.query
Class CollectionCandidates

java.lang.Object
  org.datanucleus.store.rdbms.query.CollectionCandidates

All Implemented Interfaces:

org.datanucleus.store.mapped.expression.Queryable

public class CollectionCandidates
extends java.lang.Object
implements org.datanucleus.store.mapped.expression.Queryable

Collection for candidates passed to the query by setCandidates(collection).

Field Summary

protected static org.datanucleus.util.Localiser

LOCALISER

Constructor Summary

CollectionCandidates(org.datanucleus.ObjectManager om, java.lang.Class candidateClass, java.util.Collection candidates)
Constructor.

Method Summary

org.datanucleus.FetchPlan	getFetchPlan() Accessor for the fetch plan
java.util.Collection	getUserCandidates()
boolean	isEmpty() Returns true if this collection contains no elements.
org.datanucleus.store.mapped.expression.QueryExpression	newQueryStatement() Accessor for a new Query statement.
org.datanucleus.store.mapped.expression.QueryExpression	newQueryStatement(java.lang.Class candidateClass, org.datanucleus.store.mapped.DatastoreIdentifier candidateAlias) Creates a QueryStatement.
org.datanucleus.store.query.ResultObjectFactory	newResultObjectFactory(org.datanucleus.store.mapped.expression.QueryExpression stmt, boolean ignoreCache, java.lang.Class resultClass, boolean useFetchPlan)

Methods inherited from class java.lang.Object

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

Field Detail

LOCALISER

protected static final org.datanucleus.util.Localiser LOCALISER

Constructor Detail

CollectionCandidates

public CollectionCandidates(org.datanucleus.ObjectManager om,
                            java.lang.Class candidateClass,
                            java.util.Collection candidates)

Constructor.

Parameters:

om - Object Manager

candidateClass - the Class candidate

candidates - The candidates

Method Detail

getUserCandidates

public java.util.Collection getUserCandidates()

Returns:

Returns the userCandidates.

getFetchPlan

public org.datanucleus.FetchPlan getFetchPlan()

Accessor for the fetch plan

Returns:

The fetch plan

newQueryStatement

public org.datanucleus.store.mapped.expression.QueryExpression newQueryStatement()

Accessor for a new Query statement.

Specified by:

newQueryStatement in interface org.datanucleus.store.mapped.expression.Queryable

Returns:

The Query Statement

newQueryStatement

public org.datanucleus.store.mapped.expression.QueryExpression newQueryStatement(java.lang.Class candidateClass,
                                                                                 org.datanucleus.store.mapped.DatastoreIdentifier candidateAlias)

Creates a QueryStatement. The elements that are ALLOWED to be returned after quering the database are the set of elements contained in the candidate collection.

Specified by:

newQueryStatement in interface org.datanucleus.store.mapped.expression.Queryable

Parameters:

candidateClass - Candidate class

candidateAlias - Alias to use for the candidate in the query (if the native query supports it)

Returns:

Query Statement

newResultObjectFactory

public org.datanucleus.store.query.ResultObjectFactory newResultObjectFactory(org.datanucleus.store.mapped.expression.QueryExpression stmt,
                                                                              boolean ignoreCache,
                                                                              java.lang.Class resultClass,
                                                                              boolean useFetchPlan)

Specified by:

newResultObjectFactory in interface org.datanucleus.store.mapped.expression.Queryable

isEmpty

public boolean isEmpty()

Returns true if this collection contains no elements.

Specified by:

isEmpty in interface org.datanucleus.store.mapped.expression.Queryable

Returns:

true if this collection contains no elements.