org.bitbucket.cowwoc.requirements

Interface Isolatable<T>

Type Parameters:

T - the type of requirements to isolate

All Known Subinterfaces:

BigDecimalPrecisionRequirements, BigDecimalRequirements, BigDecimalScaleRequirements, ClassRequirements<T>, CollectionRequirements<E>, CollectionSizeRequirements, ComparableRequirements<T>, DoubleRequirements, MapRequirements<K,V>, MapSizeRequirements, NumberRequirements<T>, ObjectRequirements<T>, OptionalRequirements, PathRequirements, StringLengthRequirements, StringRequirements, UriRequirements

All Known Implementing Classes:

DoubleRequirementsImpl

@Beta
public interface Isolatable<T>

Requirements that can be verified in isolation of other instances.

Interfaces that extend Isolatable are not meant to be extended, but may be implemented.

Author:

Gili Tzabari

Method Summary

Modifier and Type	Method and Description
T	isolate(Consumer<T> consumer) Verifies requirements without modifying the current instance.

Method Detail

isolate

T isolate(Consumer<T> consumer)

Verifies requirements without modifying the current instance. This can be used to combine requirements that operate on nested elements:

 Map<String, Integer> nameToId = ...;
 Requirements.requireThat(nameToId, "nameToId").keySet().contains("John Smith");
 Requirements.requireThat(nameToId, "nameToId").values().doesNotContain(0, "RESERVED_ID");

 // Can be rewritten as:
 Requirements.requireThat(nameToId, "nameToId").
   isolate(p -> p.keySet().contains("John Smith")).
   isolate(p -> p.values().doesNotContain(0, "RESERVED_ID"));
 

Parameters:

consumer - the code to execute in isolation

Returns:

this