DATAREDIS-509 - Fix handling of primitive arrays in MappingRedisConverter.

We now correctly convert arrays of primitive values.

Original pull request: #196.

Author: christophstrobl

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

@@ -17,11 +17,11 @@
 
 import java.lang.reflect.Array;
 import java.util.ArrayList;
-import java.util.Arrays;
 import java.util.Collection;
 import java.util.Collections;
 import java.util.Comparator;
 import java.util.HashMap;
+import java.util.Iterator;
 import java.util.List;
 import java.util.Map;
 import java.util.Map.Entry;
@@ -418,7 +418,7 @@ public void doWithPersistentProperty(KeyValuePersistentProperty persistentProper
 								persistentProperty.getTypeInformation().getComponentType(), sink);
 					} else if (property.getClass().isArray()) {
 
-						writeCollection(keyspace, propertyStringPath, Arrays.asList((Object[]) property),
+						writeCollection(keyspace, propertyStringPath, CollectionUtils.arrayToList(property),
 								persistentProperty.getTypeInformation().getComponentType(), sink);
 					} else {
 
@@ -584,7 +584,7 @@ private Object readCollectionOrArray(String path, Class<?> collectionType, Class
 			}
 		}
 
-		return isArray ? target.toArray((Object[]) Array.newInstance(valueType, target.size())) : target;
+		return isArray ? toArray(target, collectionType, valueType) : target;
 	}
 
 	/**
@@ -741,6 +741,30 @@ public <T> T fromBytes(byte[] source, Class<T> type) {
 		return conversionService.convert(source, type);
 	}
 
+	/**
+	 * Converts a given {@link Collection} into an array considering primitive types.
+	 *
+	 * @param source {@link Collection} of values to be added to the array.
+	 * @param arrayType {@link Class} of array.
+	 * @param valueType to be used for conversion before setting the actual value.
+	 * @return
+	 */
+	private Object toArray(Collection<Object> source, Class<?> arrayType, Class<?> valueType) {
+
+		if (!ClassUtils.isPrimitiveArray(arrayType)) {
+			return source.toArray((Object[]) Array.newInstance(valueType, source.size()));
+		}
+
+		Object targetArray = Array.newInstance(valueType, source.size());
+		Iterator<Object> iterator = source.iterator();
+		int i = 0;
+		while (iterator.hasNext()) {
+			Array.set(targetArray, i, conversionService.convert(iterator.next(), valueType));
+			i++;
+		}
+		return targetArray;
+	}
+
 	/**
 	 * Set {@link CustomConversions} to be applied.
 	 * 

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

@@ -15,10 +15,8 @@
  */
 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;
@@ -39,6 +37,7 @@
 import org.springframework.data.util.ClassTypeInformation;
 import org.springframework.data.util.TypeInformation;
 import org.springframework.util.Assert;
+import org.springframework.util.CollectionUtils;
 
 /**
  * {@link IndexResolver} implementation considering properties annotated with {@link Indexed} or paths set up in
@@ -124,17 +123,18 @@ public void doWithPersistentProperty(KeyValuePersistentProperty persistentProper
 						if (Iterable.class.isAssignableFrom(propertyValue.getClass())) {
 							iterable = (Iterable) propertyValue;
 						} else if (propertyValue.getClass().isArray()) {
-							iterable = Arrays.asList((Object[]) propertyValue);
+							iterable = CollectionUtils.arrayToList(propertyValue);
 						} else {
-							throw new RuntimeException("Don't know how to handle " + propertyValue.getClass() + " type of collection");
+							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));
+								indexes.addAll(doResolveIndexesFor(keyspace, currentPath, typeToUse.getActualType(), persistentProperty,
+										listValue));
 							}
 						}
 					}

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

@@ -167,6 +167,7 @@ public static class WithArrays {
 		Object[] arrayOfObject;
 		String[] arrayOfSimpleTypes;
 		Species[] arrayOfCompexTypes;
+		int[] arrayOfPrimitives;
 	}
 
 	static class TypeWithObjectValueTypes {

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

@@ -1581,6 +1581,36 @@ public void shouldWriteReadObjectListValueTypeCorrectly() {
 		assertThat(result.list.get(2), instanceOf(Date.class));
 	}
 
+	/**
+	 * @see DATAREDIS-509
+	 */
+	@Test
+	public void writeHandlesArraysOfPrimitivesProperly() {
+
+		Map<String, String> source = new LinkedHashMap<String, String>();
+		source.put("arrayOfPrimitives.[0]", "1");
+		source.put("arrayOfPrimitives.[1]", "2");
+		source.put("arrayOfPrimitives.[2]", "3");
+
+		WithArrays target = read(WithArrays.class, source);
+
+		assertThat(target.arrayOfPrimitives[0], is(1));
+		assertThat(target.arrayOfPrimitives[1], is(2));
+		assertThat(target.arrayOfPrimitives[2], is(3));
+	}
+
+	/**
+	 * @see DATAREDIS-509
+	 */
+	@Test
+	public void readHandlesArraysOfPrimitivesProperly() {
+
+		WithArrays source = new WithArrays();
+		source.arrayOfPrimitives = new int[] { 1, 2, 3 };
+		assertThat(write(source).getBucket(), isBucket().containingUtf8String("arrayOfPrimitives.[0]", "1")
+				.containingUtf8String("arrayOfPrimitives.[1]", "2").containingUtf8String("arrayOfPrimitives.[2]", "3"));
+	}
+
 	private RedisData write(Object source) {
 
 		RedisData rdo = new RedisData();