Fixed #358

Author: cowtowncoder

pom.xml

@@ -74,7 +74,7 @@ javax.xml.datatype, javax.xml.namespace, javax.xml.parsers
     <dependency>
       <groupId>com.fasterxml.jackson.core</groupId>
       <artifactId>jackson-core</artifactId>
-      <version>2.3.0</version>
+      <version>2.3.1-SNAPSHOT</version>
     </dependency>
 
     <!-- and for testing, JUnit is needed, as well as quite a few

release-notes/CREDITS

@@ -94,3 +94,7 @@ David Phillips:
 Seth Pellegrino (jivesoft):
   * Contributed #317: Fix `JsonNode` support for nulls bound to	`ObjectNode`, `ArrayNode`
    (2.3.0)
+
+Florian Schoppmann (fschopp@github)
+  * Reported #358: `IterableSerializer` ignoring	annotated content serializer
+   (2.3.1)

release-notes/VERSION

@@ -4,6 +4,8 @@ Version: 2.3.1 (xx-Dec-2013)
 #346: Fix problem deserializing `ObjectNode`, with @JsonCreator, empty
   JSON Object
  (reported by gaff78@github)
+#358: `IterableSerializer` ignoring annotated content serializer
+ (reported by Florian S)
 
 ------------------------------------------------------------------------
 === History: ===

src/main/java/com/fasterxml/jackson/databind/ser/std/IterableSerializer.java

@@ -48,7 +48,16 @@ public boolean isEmpty(Iterable<?> value) {
 
     @Override
     public boolean hasSingleElement(Iterable<?> value) {
-        // no really good way to determine (without consuming iterator), so:
+        // we can do it actually (fixed in 2.3.1)
+        if (value != null) {
+            Iterator<?> it = value.iterator();
+            if (it.hasNext()) {
+                it.next();
+                if (!it.hasNext()) {
+                    return true;
+                }
+            }
+        }
         return false;
     }
 
@@ -66,22 +75,24 @@ public void serializeContents(Iterable<?> value, JsonGenerator jgen, SerializerP
                 Object elem = it.next();
                 if (elem == null) {
                     provider.defaultSerializeNull(jgen);
-                } else {
+                    continue;
+                }
+                JsonSerializer<Object> currSerializer = _elementSerializer;
+                if (currSerializer == null) {
                     // Minor optimization to avoid most lookups:
                     Class<?> cc = elem.getClass();
-                    JsonSerializer<Object> currSerializer;
                     if (cc == prevClass) {
                         currSerializer = prevSerializer;
                     } else {
                         currSerializer = provider.findValueSerializer(cc, _property);
                         prevSerializer = currSerializer;
                         prevClass = cc;
                     }
-                    if (typeSer == null) {
-                        currSerializer.serialize(elem, jgen, provider);
-                    } else {
-                        currSerializer.serializeWithType(elem, jgen, provider, typeSer);
-                    }
+                }
+                if (typeSer == null) {
+                    currSerializer.serialize(elem, jgen, provider);
+                } else {
+                    currSerializer.serializeWithType(elem, jgen, provider, typeSer);
                 }
             } while (it.hasNext());
         }

src/test/java/com/fasterxml/jackson/databind/ser/TestCollectionSerialization.java

@@ -127,7 +127,25 @@ public void remove() { }
 
         public int getX() { return 13; }
     }
-    
+
+    // [Issue#358]
+    static class A {
+        public String unexpected = "Bye.";
+    }
+
+    static class B {
+        @JsonSerialize(as = Iterable.class, contentUsing = ASerializer.class)
+        public List<A> list = Arrays.asList(new A());
+    }
+    static class ASerializer extends JsonSerializer<A> {
+        @Override
+        public void serialize(A a, JsonGenerator jsonGenerator, SerializerProvider provider) throws IOException {
+            jsonGenerator.writeStartArray();
+            jsonGenerator.writeString("Hello world.");
+            jsonGenerator.writeEndArray();
+        }
+    }
+
     /*
     /**********************************************************
     /* Test methods
@@ -349,4 +367,10 @@ public void testWithIterable() throws IOException
         assertEquals("[1,2,3]",
                 MAPPER.writeValueAsString(new IntIterable()));
     }
+    
+    // [Issue#358]
+    public void testIterable358() throws Exception {
+        String json = MAPPER.writeValueAsString(new B());
+        assertEquals("{\"list\":[[\"Hello world.\"]]}", json);
+    }
 }

src/test/java/com/fasterxml/jackson/failing/TestIterable358.java

@@ -0,0 +1,38 @@
+package com.fasterxml.jackson.failing;
+
+import java.io.IOException;
+import java.util.*;
+
+import com.fasterxml.jackson.core.JsonGenerator;
+
+import com.fasterxml.jackson.databind.*;
+import com.fasterxml.jackson.databind.annotation.JsonSerialize;
+
+public class TestIterable358 extends BaseMapTest
+{
+    // [Issue#358]
+    static class A {
+        public String unexpected = "Bye.";
+    }
+
+    static class B {
+        @JsonSerialize(as = Iterable.class, contentUsing = ASerializer.class)
+        public List<A> list = Arrays.asList(new A());
+    }
+    static class ASerializer extends JsonSerializer<A> {
+        @Override
+        public void serialize(A a, JsonGenerator jsonGenerator, SerializerProvider provider) throws IOException {
+            jsonGenerator.writeStartArray();
+            jsonGenerator.writeString("Hello world.");
+            jsonGenerator.writeEndArray();
+        }
+    }
+
+    final ObjectMapper MAPPER = new ObjectMapper();
+    
+    public void testIterable358() throws Exception {
+        String json = MAPPER.writeValueAsString(new B());
+        assertEquals("{\"list\":[[\"Hello world.\"]]}", json);
+    }
+
+}