Removed containsSameNullity() due to poor usability.

\-> Inputs cannot use List.of() because it forbids nulls.
\-> Name cannot contain spaces.
\-> Output does not treat each element as a separate context value.

docs/Changelog.md

@@ -21,6 +21,7 @@ See https://github.com/cowwoc/requirements.java/commits/master for a full list.
     * Replaced `Validator.elseGetException()` with `Validator.getFailures().getException()`.
     * Renamed `Validator.isSameReferenceAs()` to `isReferenceEqualTo()`, `Validator.isNotSameReferenceAs()` to
       `isReferenceNotEqualTo()`.
+    * Removed `CollectionValidator.containsSameNullity()` yet again due to poor usability.
 * New features:
     * Added `GenericTypeValidator.isPrimitive()`.
     * Added `validationFailed()` and `getValueOrDefault()` to all validators.

java/src/main/java/com/github/cowwoc/requirements10/java/internal/message/CollectionMessages.java

@@ -415,17 +415,4 @@ public static MessageBuilder isSortedFailed(AbstractObjectValidator<?, ?> valida
 			messageBuilder.withContext(sorted, "expected");
 		return messageBuilder;
 	}
-
-	/**
-	 * @param validator the validator
-	 * @return a message for the validation failure
-	 */
-	public static MessageBuilder containsSameNullityFailed(AbstractObjectValidator<?, ?> validator)
-	{
-		String name = validator.getName();
-		MessageBuilder messageBuilder = new MessageBuilder(validator,
-			quoteName(name) + " must contain all nulls, or no nulls.");
-		validator.value.nullToInvalid().ifValid(v -> messageBuilder.withContext(v, name));
-		return messageBuilder;
-	}
 }

java/src/main/java/com/github/cowwoc/requirements10/java/internal/validator/AbstractCollectionValidator.java

@@ -399,35 +399,6 @@ public S doesNotContainDuplicates()
 		return self();
 	}
 
-	@Override
-	public S containsSameNullity()
-	{
-		if (containsSameNullityValidationFailed())
-		{
-			failOnNull();
-			addIllegalArgumentException(
-				CollectionMessages.containsSameNullityFailed(this).toString());
-		}
-		return self();
-	}
-
-	/**
-	 * @return {@code true} if the elements in the value are all {@code null} or all not {@code null}, or
-	 * {@code false} if the value is undefined, {@code null}, or contains a mix of {@code null} and not
-	 * {@code null} elements
-	 */
-	private boolean containsSameNullityValidationFailed()
-	{
-		T invalidToNull = getValueOrDefault(null);
-		if (invalidToNull == null)
-			return true;
-		int numberOfNulls = 0;
-		for (E element : invalidToNull)
-			if (element == null)
-				++numberOfNulls;
-		return numberOfNulls != invalidToNull.size();
-	}
-
 	@Override
 	public PrimitiveUnsignedIntegerValidator size()
 	{

java/src/main/java/com/github/cowwoc/requirements10/java/internal/validator/ObjectArrayValidatorImpl.java

@@ -6,7 +6,6 @@
 
 import com.github.cowwoc.requirements10.java.ValidationFailure;
 import com.github.cowwoc.requirements10.java.internal.Configuration;
-import com.github.cowwoc.requirements10.java.internal.message.CollectionMessages;
 import com.github.cowwoc.requirements10.java.internal.scope.ApplicationScope;
 import com.github.cowwoc.requirements10.java.internal.util.Arrays;
 import com.github.cowwoc.requirements10.java.internal.util.ValidationTarget;
@@ -70,22 +69,4 @@ protected Set<E> getDuplicates(E[] value)
 		}
 		return duplicates;
 	}
-
-	@Override
-	public ObjectArrayValidator<E[], E> containsSameNullity()
-	{
-		if (value.validationFailed(v ->
-		{
-			int numberOfNulls = 0;
-			for (E element : v)
-				if (element == null)
-					++numberOfNulls;
-			return numberOfNulls == getLength(v);
-		}))
-		{
-			addIllegalArgumentException(
-				CollectionMessages.containsSameNullityFailed(this).toString());
-		}
-		return this;
-	}
 }

java/src/main/java/com/github/cowwoc/requirements10/java/validator/ObjectArrayValidator.java

@@ -19,12 +19,4 @@ public interface ObjectArrayValidator<T, E> extends
 	ObjectComponent<ObjectArrayValidator<T, E>, T>,
 	ArrayComponent<ObjectArrayValidator<T, E>, T, E>
 {
-	/**
-	 * Ensures that the array contains only null values or only non-null values.
-	 *
-	 * @return this
-	 * @throws NullPointerException     if the value is null
-	 * @throws IllegalArgumentException if the array contains a mix of null and non-null values
-	 */
-	ObjectArrayValidator<T, E> containsSameNullity();
 }

java/src/main/java/com/github/cowwoc/requirements10/java/validator/component/CollectionComponent.java

@@ -493,16 +493,6 @@ public interface CollectionComponent<S, E>
 	 */
 	S doesNotContainAll(Collection<E> unwanted, String name);
 
-	/**
-	 * Ensures that the collection contains only null values, or only non-null values.
-	 *
-	 * @return this
-	 * @throws NullPointerException     if the value is {@code null}
-	 * @throws IllegalArgumentException if the collection contains a mix of {@code null} and non-{@code null}
-	 *                                  values
-	 */
-	S containsSameNullity();
-
 	/**
 	 * Ensures that the collection does not contain any duplicate elements.
 	 *

pom.xml

@@ -145,7 +145,7 @@
 			<dependency>
 				<groupId>com.github.cowwoc.pouch</groupId>
 				<artifactId>core</artifactId>
-				<version>4.4</version>
+				<version>4.6-SNAPSHOT</version>
 			</dependency>
 			<dependency>
 				<groupId>org.twdata.maven</groupId>

test/src/test/java/com/github/cowwoc/requirements10/test/java/CollectionTest.java

@@ -1180,40 +1180,4 @@ public void collectionToString()
 			new TestValidatorsImpl(scope).requireThat(actualMessages, "actualMessages").isEqualTo(expectedMessages);
 		}
 	}
-
-	public void doesNotContainMixedNullity_IsNull()
-	{
-		try (ApplicationScope scope = new TestApplicationScope(NONE))
-		{
-			TestValidators validators = new TestValidatorsImpl(scope);
-			Map<String, Object> nameToValue = new HashMap<>();
-			nameToValue.put("first", null);
-			nameToValue.put("second", null);
-			validators.requireThat(nameToValue, "nameToValue").values().containsSameNullity();
-		}
-	}
-
-	public void doesNotContainMixedNullity_IsNotNull()
-	{
-		try (ApplicationScope scope = new TestApplicationScope(NONE))
-		{
-			TestValidators validators = new TestValidatorsImpl(scope);
-			Map<String, Object> nameToValue = Map.of("first", 1,
-				"second", 10);
-			validators.requireThat(nameToValue, "nameToValue").values().containsSameNullity();
-		}
-	}
-
-	@Test(expectedExceptions = IllegalArgumentException.class)
-	public void doesNotContainMixedNullity_False()
-	{
-		try (ApplicationScope scope = new TestApplicationScope(NONE))
-		{
-			TestValidators validators = new TestValidatorsImpl(scope);
-			Map<String, Object> nameToValue = new HashMap<>();
-			nameToValue.put("first", 1);
-			nameToValue.put("second", null);
-			validators.requireThat(nameToValue, "nameToValue").values().containsSameNullity();
-		}
-	}
 }