org.hibernate.loader.plan.exec.internal

Class RootHelper

java.lang.Object

org.hibernate.loader.plan.exec.internal.RootHelper

public class RootHelper
extends Object

Field Summary

Fields

Modifier and Type	Field and Description
static RootHelper	INSTANCE Singleton access

Method Summary

Modifier and Type	Method and Description
<T extends QuerySpace> T	extractRootQuerySpace(QuerySpaces querySpaces, Class<EntityQuerySpace> returnType) Extract the root QuerySpace of the LoadPlan, assuming there is just one.
<T extends Return> T	extractRootReturn(LoadPlan loadPlan, Class<T> returnType) Extract the root return of the LoadPlan, assuming there is just one.

Methods inherited from class java.lang.Object

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

Field Detail

INSTANCE

public static final RootHelper INSTANCE

Singleton access

Method Detail

extractRootReturn

public <T extends Return> T extractRootReturn(LoadPlan loadPlan,
                                              Class<T> returnType)

Extract the root return of the LoadPlan, assuming there is just one.

Type Parameters:

T - The parameterized type of the specific Return type expected

Parameters:

loadPlan - The LoadPlan from which to extract the root return

returnType - The Return type expected, passed as an argument

Returns:

The root Return

Throws:

IllegalStateException - If there is no root, more than one root or the single root is not of the expected type.

extractRootQuerySpace

public <T extends QuerySpace> T extractRootQuerySpace(QuerySpaces querySpaces,
                                                      Class<EntityQuerySpace> returnType)

Extract the root QuerySpace of the LoadPlan, assuming there is just one.

Parameters:

querySpaces - The QuerySpaces from which to extract the root.

returnType - The QuerySpace type expected, passed as an argument

Returns:

The root QuerySpace

Throws:

IllegalStateException - If there is no root, more than one root or the single root is not of the expected type.