Improvement for #523, wrt EnumMapDeserializer, but only for 2.5 (due to minor refactorings).

Author: cowtowncoder

src/main/java/com/fasterxml/jackson/databind/deser/std/ContainerDeserializerBase.java

@@ -1,7 +1,11 @@
 package com.fasterxml.jackson.databind.deser.std;
 
+import java.io.IOException;
+import java.lang.reflect.InvocationTargetException;
+
 import com.fasterxml.jackson.databind.JavaType;
 import com.fasterxml.jackson.databind.JsonDeserializer;
+import com.fasterxml.jackson.databind.JsonMappingException;
 import com.fasterxml.jackson.databind.deser.SettableBeanProperty;
 
 /**
@@ -57,4 +61,30 @@ public SettableBeanProperty findBackReference(String refName) {
      * Accesor for deserializer use for deserializing content values.
      */
     public abstract JsonDeserializer<Object> getContentDeserializer();
+
+    /*
+    /**********************************************************
+    /* Shared methods for sub-classes
+    /**********************************************************
+     */
+
+    /**
+     * Helper method called by various Map(-like) deserializers.
+     */
+    protected void wrapAndThrow(Throwable t, Object ref, String key) throws IOException
+    {
+        // to handle StackOverflow:
+        while (t instanceof InvocationTargetException && t.getCause() != null) {
+            t = t.getCause();
+        }
+        // Errors and "plain" IOExceptions to be passed as is
+        if (t instanceof Error) {
+            throw (Error) t;
+        }
+        // ... except for mapping exceptions
+        if (t instanceof IOException && !(t instanceof JsonMappingException)) {
+            throw (IOException) t;
+        }
+        throw JsonMappingException.wrapWithPath(t, ref, key);
+    }
 }

src/main/java/com/fasterxml/jackson/databind/deser/std/EnumMapDeserializer.java

@@ -4,23 +4,19 @@
 import java.util.*;
 
 import com.fasterxml.jackson.core.*;
-
 import com.fasterxml.jackson.databind.*;
 import com.fasterxml.jackson.databind.deser.ContextualDeserializer;
-import com.fasterxml.jackson.databind.deser.std.StdDeserializer;
 import com.fasterxml.jackson.databind.jsontype.TypeDeserializer;
 
 /**
  * Deserializer for {@link EnumMap} values.
  * <p>
  * Note: casting within this class is all messed up -- just could not figure out a way
  * to properly deal with recursive definition of "EnumMap<K extends Enum<K>, V>
- * 
- * @author tsaloranta
  */
 @SuppressWarnings({ "unchecked", "rawtypes" }) 
 public class EnumMapDeserializer
-    extends StdDeserializer<EnumMap<?,?>>
+    extends ContainerDeserializerBase<EnumMap<?,?>>
     implements ContextualDeserializer
 {
     private static final long serialVersionUID = 4564890642370311174L;
@@ -47,7 +43,7 @@ public class EnumMapDeserializer
 
     public EnumMapDeserializer(JavaType mapType, JsonDeserializer<?> keyDeserializer, JsonDeserializer<?> valueDeser, TypeDeserializer valueTypeDeser)
     {
-        super(EnumMap.class);
+        super(mapType);
         _mapType = mapType;
         _enumClass = mapType.getKeyType().getRawClass();
         _keyDeserializer = (JsonDeserializer<Enum<?>>) keyDeserializer;
@@ -96,7 +92,23 @@ public JsonDeserializer<?> createContextual(DeserializationContext ctxt, BeanPro
      */
     @Override
     public boolean isCachable() { return true; }
-    
+
+    /*
+    /**********************************************************
+    /* ContainerDeserializerBase API
+    /**********************************************************
+     */
+
+    @Override
+    public JavaType getContentType() {
+        return _mapType.getContentType();
+    }
+
+    @Override
+    public JsonDeserializer<Object> getContentDeserializer() {
+        return _valueDeserializer;
+    }
+
     /*
     /**********************************************************
     /* Actual deserialization
@@ -115,6 +127,8 @@ public EnumMap<?,?> deserialize(JsonParser jp, DeserializationContext ctxt) thro
         final TypeDeserializer typeDeser = _valueTypeDeserializer;
 
         while ((jp.nextToken()) != JsonToken.END_OBJECT) {
+            String keyName = jp.getCurrentName(); // just for error message
+            // but we need to let key deserializer handle it separately, nonetheless
             Enum<?> key = _keyDeserializer.deserialize(jp, ctxt);
             if (key == null) {
                 if (!ctxt.isEnabled(DeserializationFeature.READ_UNKNOWN_ENUM_VALUES_AS_NULL)) {
@@ -127,7 +141,7 @@ public EnumMap<?,?> deserialize(JsonParser jp, DeserializationContext ctxt) thro
                     throw ctxt.weirdStringException(value, _enumClass, "value not one of declared Enum instance names");
                 }
                 /* 24-Mar-2012, tatu: Null won't work as a key anyway, so let's
-                 *  just skip the entry then. But we must skip the value then.
+                 *  just skip the entry then. But we must skip the value as well, if so.
                  */
                 jp.nextToken();
                 jp.skipChildren();
@@ -139,13 +153,18 @@ public EnumMap<?,?> deserialize(JsonParser jp, DeserializationContext ctxt) thro
              * not handle them (and maybe fail or return bogus data)
              */
             Object value;
-            
-            if (t == JsonToken.VALUE_NULL) {
-                value = valueDes.getNullValue();
-            } else if (typeDeser == null) {
-                value =  valueDes.deserialize(jp, ctxt);
-            } else {
-                value = valueDes.deserializeWithType(jp, ctxt, typeDeser);
+
+            try {
+                if (t == JsonToken.VALUE_NULL) {
+                    value = valueDes.getNullValue();
+                } else if (typeDeser == null) {
+                    value =  valueDes.deserialize(jp, ctxt);
+                } else {
+                    value = valueDes.deserializeWithType(jp, ctxt, typeDeser);
+                }
+            } catch (Exception e) {
+                wrapAndThrow(e, result, keyName);
+                return null;
             }
             result.put(key, value);
         }

src/main/java/com/fasterxml/jackson/databind/deser/std/MapDeserializer.java

@@ -1,7 +1,6 @@
 package com.fasterxml.jackson.databind.deser.std;
 
 import java.io.IOException;
-import java.lang.reflect.InvocationTargetException;
 import java.util.*;
 
 import com.fasterxml.jackson.core.*;
@@ -259,7 +258,7 @@ public JsonDeserializer<?> createContextual(DeserializationContext ctxt,
         }
         return withResolved(kd, vtd, vd, ignored);
     }
-    
+
     /*
     /**********************************************************
     /* ContainerDeserializerBase API
@@ -538,24 +537,6 @@ public Map<Object,Object> _deserializeUsingCreator(JsonParser jp, Deserializatio
     protected void wrapAndThrow(Throwable t, Object ref) throws IOException {
         wrapAndThrow(t, ref, null);
     }
-    
-    // note: copied from BeanDeserializer; should try to share somehow...
-    protected void wrapAndThrow(Throwable t, Object ref, String key) throws IOException
-    {
-        // to handle StackOverflow:
-        while (t instanceof InvocationTargetException && t.getCause() != null) {
-            t = t.getCause();
-        }
-        // Errors and "plain" IOExceptions to be passed as is
-        if (t instanceof Error) {
-            throw (Error) t;
-        }
-        // ... except for mapping exceptions
-        if (t instanceof IOException && !(t instanceof JsonMappingException)) {
-            throw (IOException) t;
-        }
-        throw JsonMappingException.wrapWithPath(t, ref, key);
-    }
 
     private void handleUnresolvedReference(JsonParser jp, MapReferringAccumulator accumulator, Object key,
             UnresolvedForwardReference reference)