DATAREDIS-492 - Handle serializing arrays and collections.

Original Pull Request: #189

Author: gregturn

src/main/java/org/springframework/data/redis/core/convert/MappingRedisConverter.java

@@ -16,6 +16,7 @@
 package org.springframework.data.redis.core.convert;
 
 import java.util.ArrayList;
+import java.util.Arrays;
 import java.util.Collection;
 import java.util.Collections;
 import java.util.Comparator;
@@ -100,6 +101,7 @@
  * </pre>
  * 
  * @author Christoph Strobl
+ * @author Greg Turnquist
  * @since 1.7
  */
 public class MappingRedisConverter implements RedisConverter, InitializingBean {
@@ -355,8 +357,8 @@ public void write(Object source, final RedisData sink) {
 			sink.setTimeToLive(ttl);
 		}
 
-		for (IndexedData indexeData : indexResolver.resolveIndexesFor(entity.getTypeInformation(), source)) {
-			sink.addIndexedData(indexeData);
+		for (IndexedData indexedData : indexResolver.resolveIndexesFor(entity.getTypeInformation(), source)) {
+			sink.addIndexedData(indexedData);
 		}
 
 	}
@@ -409,8 +411,22 @@ public void doWithPersistentProperty(KeyValuePersistentProperty persistentProper
 					writeMap(keyspace, propertyStringPath, persistentProperty.getMapValueType(),
 							(Map<?, ?>) accessor.getProperty(persistentProperty), sink);
 				} else if (persistentProperty.isCollectionLike()) {
-					writeCollection(keyspace, propertyStringPath, (Collection<?>) accessor.getProperty(persistentProperty),
+
+					final Object property = accessor.getProperty(persistentProperty);
+
+					if (property == null || Iterable.class.isAssignableFrom(property.getClass())) {
+
+						writeCollection(keyspace, propertyStringPath, (Iterable<?>) property,
 							persistentProperty.getTypeInformation().getComponentType(), sink);
+					} else if (property.getClass().isArray()) {
+
+						writeCollection(keyspace, propertyStringPath, Arrays.asList((Object[]) property),
+							persistentProperty.getTypeInformation().getComponentType(), sink);
+					} else {
+
+						throw new RuntimeException("Don't know how to handle " + property.getClass() + " type collection");
+					}
+
 				} else if (persistentProperty.isEntity()) {
 					writeInternal(keyspace, propertyStringPath, accessor.getProperty(persistentProperty),
 							persistentProperty.getTypeInformation().getActualType(), sink);
@@ -482,7 +498,7 @@ public void doWithAssociation(Association<KeyValuePersistentProperty> associatio
 	 * @param typeHint
 	 * @param sink
 	 */
-	private void writeCollection(String keyspace, String path, Collection<?> values, TypeInformation<?> typeHint,
+	private void writeCollection(String keyspace, String path, Iterable<?> values, TypeInformation<?> typeHint,
 			RedisData sink) {
 
 		if (values == null) {
@@ -492,6 +508,10 @@ private void writeCollection(String keyspace, String path, Collection<?> values,
 		int i = 0;
 		for (Object value : values) {
 
+			if (value == null) {
+				break;
+			}
+
 			String currentPath = path + ".[" + i + "]";
 
 			if (customConversions.hasCustomWriteTarget(value.getClass())) {

src/main/java/org/springframework/data/redis/core/convert/PathIndexResolver.java

@@ -15,8 +15,10 @@
  */
 package org.springframework.data.redis.core.convert;
 
+import java.util.Arrays;
 import java.util.Collections;
 import java.util.LinkedHashSet;
+import java.util.List;
 import java.util.Map;
 import java.util.Map.Entry;
 import java.util.Set;
@@ -43,6 +45,7 @@
  * {@link IndexConfiguration}.
  *
  * @author Christoph Strobl
+ * @author Greg Turnquist
  * @since 1.7
  */
 public class PathIndexResolver implements IndexResolver {
@@ -116,11 +119,23 @@ public void doWithPersistentProperty(KeyValuePersistentProperty persistentProper
 
 					} else if (persistentProperty.isCollectionLike()) {
 
-						for (Object listValue : (Iterable<?>) propertyValue) {
+						final Iterable<?> iterable;
 
-							TypeInformation<?> typeToUse = updateTypeHintForActualValue(typeHint, listValue);
-							indexes.addAll(
+						if (Iterable.class.isAssignableFrom(propertyValue.getClass())) {
+							iterable = (Iterable) propertyValue;
+						} else if (propertyValue.getClass().isArray()) {
+							iterable = Arrays.asList((Object[]) propertyValue);
+						} else {
+							throw new RuntimeException("Don't know how to handle " + propertyValue.getClass() + " type of collection");
+						}
+
+						for (Object listValue : iterable) {
+
+							if (listValue != null) {
+								TypeInformation<?> typeToUse = updateTypeHintForActualValue(typeHint, listValue);
+								indexes.addAll(
 									doResolveIndexesFor(keyspace, currentPath, typeToUse.getActualType(), persistentProperty, listValue));
+							}
 						}
 					}
 

src/test/java/org/springframework/data/redis/core/convert/MappingRedisConverterUnitTests.java

@@ -43,6 +43,7 @@
 import java.util.Date;
 import java.util.HashMap;
 import java.util.LinkedHashMap;
+import java.util.List;
 import java.util.Map;
 import java.util.UUID;
 
@@ -75,6 +76,7 @@
 
 /**
  * @author Christoph Strobl
+ * @author Greg Turnquist
  */
 @RunWith(MockitoJUnitRunner.class)
 public class MappingRedisConverterUnitTests {
@@ -146,7 +148,7 @@ public void writeDoesNotAppendPropertiesWithNullValues() {
 	 * @see DATAREDIS-425
 	 */
 	@Test
-	public void writeDoesNotAppendPropertiesWithEmtpyCollections() {
+	public void writeDoesNotAppendPropertiesWithEmptyCollections() {
 
 		rand.firstname = "rand";
 
@@ -435,6 +437,27 @@ public void writeAppendsMapWithSimpleKeyCorrectly() {
 				.containingUtf8String("physicalAttributes.[eye-color]", "grey"));
 	}
 
+	/**
+	 * @see DATAREDIS-492
+	 */
+	@Test
+	public void writeHandlesArraysProperly() {
+
+		this.converter = new MappingRedisConverter(null, null, resolverMock);
+		this.converter
+			.setCustomConversions(new CustomConversions(Collections.singletonList(new ListToByteConverter())));
+		this.converter.afterPropertiesSet();
+
+		Map<String, Object> innerMap = new LinkedHashMap<String, Object>();
+		innerMap.put("address", "tyrionl@netflix.com");
+		innerMap.put("when", new String[]{"pipeline.failed"});
+
+		Map<String, Object> map = new LinkedHashMap<String, Object>();
+		map.put("email", Collections.singletonList(innerMap));
+
+		RedisData target = write(map);
+	}
+
 	/**
 	 * @see DATAREDIS-425
 	 */
@@ -1375,6 +1398,35 @@ public Map<String, byte[]> convert(Species source) {
 		}
 	}
 
+	@WritingConverter
+	static class ListToByteConverter implements Converter<List, byte[]> {
+
+		private final ObjectMapper mapper;
+		private final Jackson2JsonRedisSerializer<List> serializer;
+
+		ListToByteConverter() {
+
+			mapper = new ObjectMapper();
+			mapper.setVisibility(mapper.getSerializationConfig().getDefaultVisibilityChecker()
+				.withFieldVisibility(Visibility.ANY).withGetterVisibility(Visibility.NONE)
+				.withSetterVisibility(Visibility.NONE).withCreatorVisibility(Visibility.NONE));
+
+			serializer = new Jackson2JsonRedisSerializer<List>(List.class);
+			serializer.setObjectMapper(mapper);
+		}
+
+		@Override
+		public byte[] convert(List source) {
+
+			if (source == null || source.isEmpty()) {
+				return null;
+			}
+
+			return serializer.serialize(source);
+		}
+	}
+
+
 	@ReadingConverter
 	static class MapToSpeciesConverter implements Converter<Map<String, byte[]>, Species> {