Add support for module bundles (#2432)

Add support for module bundles (#2432)

Author: marcospassos

src/main/java/com/fasterxml/jackson/databind/Module.java

@@ -15,6 +15,7 @@
 import com.fasterxml.jackson.databind.ser.Serializers;
 import com.fasterxml.jackson.databind.type.TypeFactory;
 import com.fasterxml.jackson.databind.type.TypeModifier;
+import java.util.Collections;
 
 /**
  * Simple interface for extensions that can be registered with {@link ObjectMapper}
@@ -73,6 +74,17 @@ public Object getTypeId() {
      * using callback methods passed-in context object exposes.
      */
     public abstract void setupModule(SetupContext context);
+
+    /**
+     * Returns the list of dependent modules.
+     *
+     * It is called to let modules register other modules as dependencies.
+     *
+     * @since 2.10
+     */
+    public Iterable<? extends Module> getDependencies() {
+        return Collections.emptyList();
+    }
 
     /*
     /**********************************************************

src/main/java/com/fasterxml/jackson/databind/ObjectMapper.java

@@ -796,6 +796,8 @@ public ObjectMapper registerModule(Module module)
             throw new IllegalArgumentException("Module without defined version");
         }
 
+        registerModules(module.getDependencies());
+
         // And then call registration
         module.setupModule(new Module.SetupContext()
         {
@@ -961,6 +963,7 @@ public void setNamingStrategy(PropertyNamingStrategy naming) {
                 setPropertyNamingStrategy(naming);
             }
         });
+
         return this;
     }
 

src/test/java/com/fasterxml/jackson/databind/ObjectMapperTest.java

@@ -1,5 +1,6 @@
 package com.fasterxml.jackson.databind;
 
+import com.fasterxml.jackson.databind.module.SimpleModule;
 import java.io.*;
 import java.util.*;
 
@@ -410,4 +411,41 @@ public void testDataInputViaMapper() throws Exception
                 .readTree(input);
         assertNotNull(n);
     }
+
+    public void testRegisterDependentModules() {
+        ObjectMapper objectMapper = new ObjectMapper();
+
+        final SimpleModule secondModule = new SimpleModule() {
+            @Override
+            public Object getTypeId() {
+                return "second";
+            }
+        };
+
+        final SimpleModule thirdModule = new SimpleModule() {
+            @Override
+            public Object getTypeId() {
+                return "third";
+            }
+        };
+
+        final SimpleModule firstModule = new SimpleModule() {
+            @Override
+            public Iterable<? extends Module> getDependencies() {
+                return Arrays.asList(secondModule, thirdModule);
+            }
+
+            @Override
+            public Object getTypeId() {
+                return "first";
+            }
+        };
+
+        objectMapper.registerModule(firstModule);
+
+        assertEquals(
+            new HashSet<>(Arrays.asList("first", "second", "third")),
+            objectMapper.getRegisteredModuleIds()
+        );
+    }
 }