UniqueWithDuplicateNullsExternalSortFactory (Apache Derby V10.14 Internals)

java.lang.Object
- org.apache.derby.impl.store.access.sort.ExternalSortFactory
- - org.apache.derby.impl.store.access.sort.UniqueWithDuplicateNullsExternalSortFactory

All Implemented Interfaces:

ModuleControl, ModuleSupportable, MethodFactory, SortFactory, SortCostController
```
public class UniqueWithDuplicateNullsExternalSortFactory
extends ExternalSortFactory
```
Method factory to support sorting of Almost unique index. This class overrides getMergeSort of ExternalSortFactory to return UniqueWithDuplicateNullsMergeSort.

Field Summary

Fields
Modifier and Type Field Description

private static java.lang.String IMPLEMENTATIONID
- Fields inherited from class org.apache.derby.impl.store.access.sort.ExternalSortFactory
  DEFAULT_MAX_MERGE_RUN, DEFAULT_MEM_USE
- Fields inherited from interface org.apache.derby.iapi.store.access.conglomerate.SortFactory
  MODULE

Fields
Modifier and Type	Field	Description
`private static java.lang.String`	`IMPLEMENTATIONID`

Constructor Summary

Constructors
Constructor Description

UniqueWithDuplicateNullsExternalSortFactory()

Constructors
Constructor	Description
`UniqueWithDuplicateNullsExternalSortFactory()`

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`protected MergeSort`	`getMergeSort()`	Returns merge sort implementation.
`java.lang.String`	`primaryImplementationType()`	Return the primary implementation type for this access method.
`boolean`	`supportsImplementation(java.lang.String implementationId)`	Return whether this access method implements the implementation type given in the argument string.

Methods inherited from class org.apache.derby.impl.store.access.sort.ExternalSortFactory
boot, canSupport, close, createSort, defaultProperties, getSortCost, openSortCostController, primaryFormat, stop, supportsFormat

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Field Detail
  - IMPLEMENTATIONID
```
private static final java.lang.String IMPLEMENTATIONID
```
    See Also:
    
    Constant Field Values
- Constructor Detail
  - UniqueWithDuplicateNullsExternalSortFactory
```
public UniqueWithDuplicateNullsExternalSortFactory()
```
- Method Detail
  - getMergeSort
```
protected MergeSort getMergeSort()
```
    Description copied from class: ExternalSortFactory
    
    Returns merge sort implementation. Extending classes can overide this method to customize sorting.
    
    Overrides:
    
    getMergeSort in class ExternalSortFactory
    
    Returns:
    
    MergeSort implementation
  - primaryImplementationType
```
public java.lang.String primaryImplementationType()
```
    Description copied from interface: MethodFactory
    
    Return the primary implementation type for this access method. Although an access method may implement more than one implementation type, this is the expected one. The access manager will put the primary implementation type in a hash table for fast access.
    
    Specified by:
    
    primaryImplementationType in interface MethodFactory
    
    Overrides:
    
    primaryImplementationType in class ExternalSortFactory
    
    See Also:
    
    MethodFactory.primaryImplementationType()
  - supportsImplementation
```
public boolean supportsImplementation(java.lang.String implementationId)
```
    Description copied from interface: MethodFactory
    
    Return whether this access method implements the implementation type given in the argument string.
    
    Specified by:
    
    supportsImplementation in interface MethodFactory
    
    Overrides:
    
    supportsImplementation in class ExternalSortFactory
    
    See Also:
    
    MethodFactory.supportsImplementation(java.lang.String)

Class UniqueWithDuplicateNullsExternalSortFactory

Field Summary

Fields inherited from class org.apache.derby.impl.store.access.sort.ExternalSortFactory

Fields inherited from interface org.apache.derby.iapi.store.access.conglomerate.SortFactory

Constructor Summary

Method Summary

Methods inherited from class org.apache.derby.impl.store.access.sort.ExternalSortFactory

Methods inherited from class java.lang.Object

Field Detail

IMPLEMENTATIONID

Constructor Detail

UniqueWithDuplicateNullsExternalSortFactory

Method Detail

getMergeSort

primaryImplementationType

supportsImplementation