DATAKV-101 - Favor Iterable over Collection types for KeyValueOperations.

Change return types for Adapter and Operations from Collection types to Iterable. Added count(keyspace) to KeyValueAdapter.

Original pull request: #8.

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

@@ -0,0 +1,92 @@
+/*
+ * Copyright 2015 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.core;
+
+import static org.hamcrest.collection.IsEmptyCollection.*;
+import static org.hamcrest.collection.IsIterableContainingInOrder.*;
+import static org.hamcrest.core.IsInstanceOf.*;
+import static org.hamcrest.core.IsNull.*;
+import static org.hamcrest.core.IsSame.*;
+import static org.junit.Assert.*;
+import static org.springframework.data.keyvalue.core.IterableConverter.*;
+
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.HashSet;
+import java.util.LinkedHashSet;
+import java.util.List;
+import java.util.Set;
+
+import org.junit.Test;
+
+/**
+ * @author Christoph Strobl
+ */
+public class IterableConverterUnitTests {
+
+	/**
+	 * @see DATAKV-101
+	 */
+	@Test
+	public void toListShouldReturnEmptyListWhenSourceIsNull() {
+		assertThat(toList(null), notNullValue());
+	}
+
+	/**
+	 * @see DATAKV-101
+	 */
+	@Test
+	public void toListShouldReturnEmptyListWhenSourceEmpty() {
+		assertThat(toList(Collections.emptySet()), empty());
+	}
+
+	/**
+	 * @see DATAKV-101
+	 */
+	@Test
+	public void toListShouldReturnSameObjectWhenSourceIsAlreadyListType() {
+
+		List<String> source = new ArrayList<String>();
+
+		assertThat(toList(source), sameInstance(source));
+	}
+
+	/**
+	 * @see DATAKV-101
+	 */
+	@Test
+	public void toListShouldReturnListWhenSourceIsNonListType() {
+
+		Set<String> source = new HashSet<String>();
+		source.add("tyrion");
+
+		assertThat(toList(source), instanceOf(List.class));
+	}
+
+	/**
+	 * @see DATAKV-101
+	 */
+	@Test
+	public void toListShouldHoldValuesInOrderOfSource() {
+
+		Set<String> source = new LinkedHashSet<String>();
+		source.add("tyrion");
+		source.add("jaime");
+
+		assertThat(toList(source), contains(source.toArray(new String[2])));
+	}
+
+}

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

@@ -362,11 +362,9 @@ public class KeyValueTemplateUnitTests {
 	 * @see DATACMNS-525
 	 */
 	@Test
-	@SuppressWarnings({ "rawtypes", "unchecked" })
 	public void countShouldReturnCollectionSize() {
 
-		Collection foo = Arrays.asList(FOO_ONE, FOO_ONE);
-		when(adapterMock.getAllOf(Foo.class.getName())).thenReturn(foo);
+		when(adapterMock.count(Foo.class.getName())).thenReturn(2L);
 
 		assertThat(template.count(Foo.class), is(2L));
 	}