Proposed patch to issue #24

src/main/java/com/fasterxml/jackson/module/jsonSchema/factories/MapVisitor.java

@@ -5,6 +5,7 @@
 import com.fasterxml.jackson.databind.SerializerProvider;
 import com.fasterxml.jackson.databind.jsonFormatVisitors.JsonFormatVisitable;
 import com.fasterxml.jackson.databind.jsonFormatVisitors.JsonMapFormatVisitor;
+import com.fasterxml.jackson.module.jsonSchema.JsonSchema;
 import com.fasterxml.jackson.module.jsonSchema.types.ObjectSchema;
 
 /**
@@ -19,6 +20,8 @@ public class MapVisitor extends JsonMapFormatVisitor.Base
 
     protected SerializerProvider provider;
 
+    private WrapperFactory wrapperFactory = new WrapperFactory();
+
     public MapVisitor(SerializerProvider provider, ObjectSchema schema)
     {
         this.provider = provider;
@@ -58,10 +61,21 @@ public void keyFormat(JsonFormatVisitable handler, JavaType keyType)
         // JSON Schema only allows String types so let's not bother too much
     }
 
-    @Override
+   @Override
     public void valueFormat(JsonFormatVisitable handler, JavaType valueType)
             throws JsonMappingException {
-        /* Also... not sure what to do with value type either.
-         */
+
+        // ISSUE #24: https://github.com/FasterXML/jackson-module-jsonSchema/issues/24
+
+        JsonSchema valueSchema = propertySchema(handler, valueType);
+        ObjectSchema.AdditionalProperties ap = new ObjectSchema.SchemaAdditionalProperties(valueSchema.asSimpleTypeSchema());
+        this.schema.setAdditionalProperties(ap);
+    }
+
+    protected JsonSchema propertySchema(JsonFormatVisitable handler, JavaType propertyTypeHint)
+            throws JsonMappingException {
+        SchemaFactoryWrapper visitor = wrapperFactory.getWrapper(getProvider());
+        handler.acceptJsonFormatVisitor(visitor, propertyTypeHint);
+        return visitor.finalSchema();
     }
 }

src/main/java/com/fasterxml/jackson/module/jsonSchema/types/AdditionalPropertiesDeserializer.java

@@ -0,0 +1,56 @@
+/*
+ * Copyright 2013 FasterXML.
+ *
+ * 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 com.fasterxml.jackson.module.jsonSchema.types;
+
+import com.fasterxml.jackson.core.JsonParser;
+import com.fasterxml.jackson.core.JsonProcessingException;
+import com.fasterxml.jackson.core.TreeNode;
+import com.fasterxml.jackson.databind.DeserializationContext;
+import com.fasterxml.jackson.databind.JsonDeserializer;
+import com.fasterxml.jackson.databind.JsonMappingException;
+import com.fasterxml.jackson.databind.ObjectMapper;
+import com.fasterxml.jackson.databind.node.BooleanNode;
+import com.fasterxml.jackson.databind.node.ObjectNode;
+import com.fasterxml.jackson.module.jsonSchema.JsonSchema;
+import java.io.IOException;
+
+/**
+ *
+ * @author Ignacio del Valle Alles
+ */
+public class AdditionalPropertiesDeserializer extends JsonDeserializer<ObjectSchema.AdditionalProperties> {
+
+    @Override
+    public ObjectSchema.AdditionalProperties deserialize(JsonParser jp, DeserializationContext ctxt) throws IOException, JsonProcessingException {
+        ObjectMapper mapper = (ObjectMapper) jp.getCodec();
+        TreeNode node = mapper.readTree(jp);
+        String nodeStr = mapper.writeValueAsString(node);
+        if (node instanceof ObjectNode) {
+            JsonSchema innerSchema = mapper.readValue(nodeStr, JsonSchema.class);
+            return new ObjectSchema.SchemaAdditionalProperties(innerSchema);
+        } else if (node instanceof BooleanNode) {
+            BooleanNode booleanNode = (BooleanNode) node;
+            if (booleanNode.booleanValue()) {
+                return null; // "additionalProperties":true is the default
+            } else {
+                return ObjectSchema.NoAdditionalProperties.instance;
+            }
+        } else {
+            throw new JsonMappingException("additionalProperties nodes can only be of "
+                    + "type boolean or object: " + nodeStr);
+        }
+    }
+}

src/main/java/com/fasterxml/jackson/module/jsonSchema/types/ObjectSchema.java

@@ -10,6 +10,7 @@
 import com.fasterxml.jackson.annotation.JsonValue;
 
 import com.fasterxml.jackson.databind.BeanProperty;
+import com.fasterxml.jackson.databind.annotation.JsonDeserialize;
 import com.fasterxml.jackson.databind.jsonFormatVisitors.JsonFormatTypes;
 
 import com.fasterxml.jackson.module.jsonSchema.JsonSchema;
@@ -184,6 +185,7 @@ public void setProperties(Map<String, JsonSchema> properties) {
 	    this.properties = properties;
 	}
 
+        @JsonDeserialize(using = AdditionalPropertiesDeserializer.class)
 	public static abstract class AdditionalProperties {
 		@JsonCreator
 		public AdditionalProperties jsonCreator() {
@@ -222,6 +224,7 @@ public Boolean value() {
 		public static final NoAdditionalProperties instance = new NoAdditionalProperties();
 	}
 
+
 	public static class SchemaAdditionalProperties extends AdditionalProperties {
 
 		@JsonProperty
@@ -237,6 +240,7 @@ public boolean equals(Object obj) {
 						getJsonSchema().equals(((SchemaAdditionalProperties)obj).getJsonSchema());
 		}
 
+		@JsonValue
 		public JsonSchema getJsonSchema() {
 		    return jsonSchema;
 		}
@@ -333,4 +337,4 @@ public String getDependsOn() {
 		}
 	}
 
-}
+}