org.whaka.data

Class NullStrategy

java.lang.Object

org.whaka.data.NullStrategy

public class NullStrategy
extends java.lang.Object

Class provides functional methods to transform arrays or collections to append a null value to it.

Each instance provides two methods:

• apply(Object[])
• apply(Collection)

Each method applies functionality specific to a strategy. Currently there're these options:

• NO_STRATEGY
• NULLABLE_START
• NULLABLE_END

Also for manual use there're some static methods available:

• nullableStart(Collection)
• nullableEnd(Collection)

Field Summary

Fields

Modifier and Type	Field and Description
static NullStrategy	NO_STRATEGY No strategy is applied.
static NullStrategy	NULLABLE_END If specified set contains null as a last element - nothing happens.
static NullStrategy	NULLABLE_START If specified set contains null as a first element - nothing happens.

Method Summary

Modifier and Type	Method and Description
<T> java.util.List<T>	apply(java.util.Collection<T> col) Specified collection is copied into a list in any case.
<T> T[]	apply(T[] arr) Specified array is cloned in any case.
static <T> java.util.List<T>	nullableEnd(java.util.Collection<T> col) Equal to the NULLABLE_END strategy.
static <T> java.util.List<T>	nullableStart(java.util.Collection<T> col) Equal to the NULLABLE_START strategy.

Methods inherited from class java.lang.Object

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

Field Detail

NO_STRATEGY

public static NullStrategy NO_STRATEGY

No strategy is applied.

• apply(Object[]) specified array will be cloned without any changes.
  
  
• apply(Collection) specified collection will be transformed into a list without any other changes.

NULLABLE_START

public static NullStrategy NULLABLE_START

If specified set contains null as a first element - nothing happens. Otherwise - null is appended at the beginning of a set.

See Also:

apply(Object[]), apply(Collection)

NULLABLE_END

public static NullStrategy NULLABLE_END

If specified set contains null as a last element - nothing happens. Otherwise - null is appended at the end of a set.

See Also:

apply(Object[]), apply(Collection)

Method Detail

apply

public <T> T[] apply(T[] arr)

Specified array is cloned in any case. Any other behavior is specific to a strategy.

apply

public <T> java.util.List<T> apply(java.util.Collection<T> col)

Specified collection is copied into a list in any case. Any other behavior is specific to a strategy.

nullableStart

public static <T> java.util.List<T> nullableStart(java.util.Collection<T> col)

Equal to the NULLABLE_START strategy.

Specified Collection is copied into a list in any case.

nullableEnd

public static <T> java.util.List<T> nullableEnd(java.util.Collection<T> col)

Equal to the NULLABLE_END strategy.

Specified Collection is copied into a list in any case.