#156 ServiceProvider enabling Jackson ObjectMapper configuration

json-unit-core/src/main/java/net/javacrumbs/jsonunit/core/internal/Jackson2NodeFactory.java

@@ -19,32 +19,26 @@
 import com.fasterxml.jackson.databind.JsonNode;
 import com.fasterxml.jackson.databind.ObjectMapper;
 import com.fasterxml.jackson.databind.node.NullNode;
+import net.javacrumbs.jsonunit.core.jackson2.ObjectMapperProvider;
 
 import java.io.IOException;
 import java.io.Reader;
 import java.math.BigDecimal;
 import java.util.Iterator;
 import java.util.Map;
+import java.util.ServiceLoader;
 
 import static net.javacrumbs.jsonunit.core.internal.Utils.closeQuietly;
 
 /**
  * Deserializes node using Jackson 2
  */
 class Jackson2NodeFactory extends AbstractNodeFactory {
-    private static final ObjectMapper mapper = new ObjectMapper();
-    private static final ObjectMapper lenientMapper = new ObjectMapper();
-
-    static {
-        lenientMapper.configure(JsonParser.Feature.ALLOW_UNQUOTED_FIELD_NAMES, true);
-        lenientMapper.configure(JsonParser.Feature.ALLOW_COMMENTS, true);
-        lenientMapper.configure(JsonParser.Feature.ALLOW_SINGLE_QUOTES, true);
-    }
-
+    private final ServiceLoader<ObjectMapperProvider> serviceLoader = ServiceLoader.load(ObjectMapperProvider.class);
 
     @Override
     protected Node doConvertValue(Object source) {
-        return newNode(mapper.convertValue(source, JsonNode.class));
+        return newNode(getMapper(false).convertValue(source, JsonNode.class));
     }
 
     @Override
@@ -63,7 +57,16 @@ protected Node readValue(Reader value, String label, boolean lenient) {
     }
 
     private ObjectMapper getMapper(boolean lenient) {
-        return lenient ? lenientMapper : mapper;
+        return getMapperProvider().getObjectMapper(lenient);
+    }
+
+    private ObjectMapperProvider getMapperProvider() {
+        Iterator<ObjectMapperProvider> iterator = serviceLoader.iterator();
+        if (iterator.hasNext()) {
+            return iterator.next();
+        } else {
+            return DefaultObjectMapperProvider.INSTANCE;
+        }
     }
 
     private static Node newNode(JsonNode jsonNode) {
@@ -177,4 +180,21 @@ public String toString() {
             return jsonNode.toString();
         }
     }
+
+    private static class DefaultObjectMapperProvider implements ObjectMapperProvider {
+        static final ObjectMapperProvider INSTANCE = new DefaultObjectMapperProvider();
+
+        private static final ObjectMapper mapper = new ObjectMapper();
+        private static final ObjectMapper lenientMapper = new ObjectMapper();
+
+        static {
+            lenientMapper.configure(JsonParser.Feature.ALLOW_UNQUOTED_FIELD_NAMES, true);
+            lenientMapper.configure(JsonParser.Feature.ALLOW_COMMENTS, true);
+            lenientMapper.configure(JsonParser.Feature.ALLOW_SINGLE_QUOTES, true);
+        }
+        @Override
+        public ObjectMapper getObjectMapper(boolean lenient) {
+            return lenient ? lenientMapper : mapper;
+        }
+    }
 }

json-unit-core/src/main/java/net/javacrumbs/jsonunit/core/jackson2/ObjectMapperProvider.java

@@ -0,0 +1,25 @@
+/**
+ * Copyright 2009-2017 the original author or authors.
+ * <p>
+ * 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
+ * <p>
+ * http://www.apache.org/licenses/LICENSE-2.0
+ * <p>
+ * 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 net.javacrumbs.jsonunit.core.jackson2;
+
+import com.fasterxml.jackson.databind.ObjectMapper;
+
+/**
+ * Interface for customizing ObjectMapper. {@see https://docs.oracle.com/javase/tutorial/sound/SPI-intro.html}
+ */
+public interface ObjectMapperProvider {
+    ObjectMapper getObjectMapper(boolean lenient);
+}

tests/pom.xml

@@ -14,6 +14,7 @@
     <modules>
         <module>test-base</module>
         <module>test-jackson2</module>
+        <module>test-jackson2-config</module>
         <module>test-gson</module>
         <module>test-jsonorg</module>
         <module>test-moshi</module>