DATAKV-129 - Allow usage of @AliasFor with @KeySpace.

We now allow using Spring's meta-annotation programming model. Own meta-annotations can be composed using @KeySpace and @AliasFor annotation.
Example for a custom meta-annotation corresponding to @KeySpace("sessions") when it's used with @SessionsKeyspace class MyEntity {…}:

@Persistent
@Retention(RetentionPolicy.RUNTIME)
@Target({ ElementType.TYPE })
@KeySpace
public @interface SessionsKeyspace {

	@AliasFor(annotation = KeySpace.class, attribute = "value")
	String name() default "sessions";
}

Original pull request: #19.

src/test/java/org/springframework/data/keyvalue/CustomKeySpaceAnnotationWithAliasFor.java

@@ -0,0 +1,40 @@
+/*
+ * Copyright 2016 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.springframework.data.keyvalue;
+
+import java.lang.annotation.ElementType;
+import java.lang.annotation.Retention;
+import java.lang.annotation.RetentionPolicy;
+import java.lang.annotation.Target;
+
+import org.springframework.core.annotation.AliasFor;
+import org.springframework.data.annotation.Persistent;
+import org.springframework.data.keyvalue.annotation.KeySpace;
+
+/**
+ * Custom composed {@link Persistent} annotation using {@link AliasFor} on name attribute.
+ * 
+ * @author Christoph Strobl
+ */
+@Persistent
+@Retention(RetentionPolicy.RUNTIME)
+@Target({ ElementType.TYPE })
+@KeySpace
+public @interface CustomKeySpaceAnnotationWithAliasFor {
+
+	@AliasFor(annotation = KeySpace.class, attribute = "value")
+	String name() default "";
+}

src/test/java/org/springframework/data/keyvalue/TypeWithCustomComposedKeySpaceAnnotationUsingAliasFor.java

@@ -0,0 +1,83 @@
+/*
+ * Copyright 2016 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.springframework.data.keyvalue;
+
+import org.springframework.data.annotation.Id;
+import org.springframework.data.annotation.Persistent;
+import org.springframework.util.ObjectUtils;
+
+/**
+ * A {@link Persistent} type with {@link CustomKeySpaceAnnotationWithAliasFor}.
+ * 
+ * @author Christoph Strobl
+ */
+@CustomKeySpaceAnnotationWithAliasFor(name = "aliased")
+public class TypeWithCustomComposedKeySpaceAnnotationUsingAliasFor {
+
+	@Id String id;
+	String name;
+
+	public TypeWithCustomComposedKeySpaceAnnotationUsingAliasFor(String name) {
+		this.name = name;
+	}
+
+	public String getId() {
+		return id;
+	}
+
+	public void setId(String id) {
+		this.id = id;
+	}
+
+	public String getName() {
+		return name;
+	}
+
+	public void setName(String name) {
+		this.name = name;
+	}
+
+	@Override
+	public int hashCode() {
+		final int prime = 31;
+		int result = 1;
+		result = prime * result + ObjectUtils.nullSafeHashCode(this.id);
+		result = prime * result + ObjectUtils.nullSafeHashCode(this.name);
+		return result;
+	}
+
+	@Override
+	public boolean equals(Object obj) {
+		if (this == obj) {
+			return true;
+		}
+		if (obj == null) {
+			return false;
+		}
+		if (!(obj instanceof TypeWithCustomComposedKeySpaceAnnotationUsingAliasFor)) {
+			return false;
+		}
+		TypeWithCustomComposedKeySpaceAnnotationUsingAliasFor other = (TypeWithCustomComposedKeySpaceAnnotationUsingAliasFor) obj;
+		if (!ObjectUtils.nullSafeEquals(this.id, other.id)) {
+			return false;
+		}
+		if (!ObjectUtils.nullSafeEquals(this.name, other.name)) {
+			return false;
+		}
+		return true;
+	}
+
+}

src/test/java/org/springframework/data/keyvalue/core/KeyValueTemplateUnitTests.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2014-2015 the original author or authors.
+ * Copyright 2014-2016 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -42,6 +42,7 @@ import org.springframework.dao.InvalidDataAccessApiUsageException;
 import org.springframework.data.annotation.Id;
 import org.springframework.data.keyvalue.SubclassOfTypeWithCustomComposedKeySpaceAnnotation;
 import org.springframework.data.keyvalue.TypeWithCustomComposedKeySpaceAnnotation;
+import org.springframework.data.keyvalue.TypeWithCustomComposedKeySpaceAnnotationUsingAliasFor;
 import org.springframework.data.keyvalue.core.event.KeyValueEvent;
 import org.springframework.data.keyvalue.core.event.KeyValueEvent.AfterDeleteEvent;
 import org.springframework.data.keyvalue.core.event.KeyValueEvent.AfterDropKeySpaceEvent;
@@ -69,6 +70,8 @@ public class KeyValueTemplateUnitTests {
 	private static final Foo FOO_TWO = new Foo("two");
 	private static final TypeWithCustomComposedKeySpaceAnnotation ALIASED = new TypeWithCustomComposedKeySpaceAnnotation(
 			"super");
+	private static final TypeWithCustomComposedKeySpaceAnnotationUsingAliasFor ALIASED_USING_ALIAS_FOR = new TypeWithCustomComposedKeySpaceAnnotationUsingAliasFor(
+			"super");
 	private static final SubclassOfTypeWithCustomComposedKeySpaceAnnotation SUBCLASS_OF_ALIASED = new SubclassOfTypeWithCustomComposedKeySpaceAnnotation(
 			"sub");
 	private static final KeyValueQuery<String> STRING_QUERY = new KeyValueQuery<String>("foo == 'two'");
@@ -697,6 +700,17 @@ public class KeyValueTemplateUnitTests {
 		assertThat(captor.getValue().getKeyspace(), is(Foo.class.getName()));
 	}
 
+	/**
+	 * @see DATAKV-129
+	 */
+	@Test
+	public void insertShouldRespectTypeAliasUsingAliasFor() {
+
+		template.insert("1", ALIASED_USING_ALIAS_FOR);
+
+		verify(adapterMock, times(1)).put("1", ALIASED_USING_ALIAS_FOR, "aliased");
+	}
+
 	@SuppressWarnings("rawtypes")
 	private void setEventsToPublish(Class<? extends KeyValueEvent>... events) {
 		template.setEventTypesToPublish(new HashSet<Class<? extends KeyValueEvent>>(Arrays.asList(events)));

src/test/java/org/springframework/data/keyvalue/core/mapping/AnnotationBasedKeySpaceResolverUnitTests.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2014 the original author or authors.
+ * Copyright 2014-2016 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -25,6 +25,7 @@ import java.lang.annotation.Target;
 
 import org.junit.Before;
 import org.junit.Test;
+import org.springframework.core.annotation.AliasFor;
 import org.springframework.data.annotation.Persistent;
 import org.springframework.data.keyvalue.TypeWithDirectKeySpaceAnnotation;
 import org.springframework.data.keyvalue.TypeWithInhteritedPersistentAnnotationNotHavingKeySpace;
@@ -102,6 +103,22 @@ public class AnnotationBasedKeySpaceResolverUnitTests {
 		assertThat(resolver.resolveKeySpace(TypeWithDirectKeySpaceAnnotation.class), is("rhaegar"));
 	}
 
+	/**
+	 * @see DATAKV-129
+	 */
+	@Test
+	public void shouldResolveKeySpaceUsingAliasForCorrectly() {
+		assertThat(resolver.resolveKeySpace(EntityWithSetKeySpaceUsingAliasFor.class), is("viserys"));
+	}
+
+	/**
+	 * @see DATAKV-129
+	 */
+	@Test
+	public void shouldResolveKeySpaceUsingAliasForCorrectlyOnSubClass() {
+		assertThat(resolver.resolveKeySpace(EntityWithInheritedKeySpaceUsingAliasFor.class), is("viserys"));
+	}
+
 	@PersistentAnnotationWithExplicitKeySpace
 	static class EntityWithDefaultKeySpace {
 
@@ -116,6 +133,15 @@ public class AnnotationBasedKeySpaceResolverUnitTests {
 
 	}
 
+	@PersistentAnnotationWithExplicitKeySpace(firstname = "viserys")
+	static class EntityWithSetKeySpaceUsingAliasFor {
+
+	}
+
+	static class EntityWithInheritedKeySpaceUsingAliasFor extends EntityWithSetKeySpaceUsingAliasFor {
+
+	}
+
 	@Persistent
 	@Retention(RetentionPolicy.RUNTIME)
 	@Target({ ElementType.TYPE })
@@ -127,6 +153,19 @@ public class AnnotationBasedKeySpaceResolverUnitTests {
 		String lastnamne() default "targaryen";
 	}
 
+	@Persistent
+	@Retention(RetentionPolicy.RUNTIME)
+	@Target({ ElementType.TYPE })
+	@KeySpace
+	static @interface PersistentAnnotationWithExplicitKeySpaceUsingAliasFor {
+
+		@AliasFor(annotation = KeySpace.class, attribute = "value")
+		String firstname() default "daenerys";
+
+		String lastnamne() default "targaryen";
+
+	}
+
 	static class TypeWithoutKeySpace {
 
 		String foo;