#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.providers.Jackson2ObjectMapperProvider;
 
 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<Jackson2ObjectMapperProvider> serviceLoader = ServiceLoader.load(Jackson2ObjectMapperProvider.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 Jackson2ObjectMapperProvider getMapperProvider() {
+        Iterator<Jackson2ObjectMapperProvider> 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 Jackson2ObjectMapperProvider {
+        static final Jackson2ObjectMapperProvider 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/providers/Jackson2ObjectMapperProvider.java

@@ -0,0 +1,30 @@
+/**
+ * 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.providers;
+
+import com.fasterxml.jackson.databind.ObjectMapper;
+
+/**
+ * Interface for customizing Jackson 2 ObjectMapper. {@see https://docs.oracle.com/javase/tutorial/sound/SPI-intro.html}
+ */
+public interface Jackson2ObjectMapperProvider {
+    /**
+     * Provides ObjectMapper
+     * @param lenient Lenient parsing is used for parsing the expected JSON value
+     * @return customized ObjectMapper.
+     */
+    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>

tests/test-jackson2-config/pom.xml

@@ -0,0 +1,36 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <parent>
+        <artifactId>tests</artifactId>
+        <groupId>net.javacrumbs.json-unit</groupId>
+        <version>2.2.1-SNAPSHOT</version>
+    </parent>
+    <modelVersion>4.0.0</modelVersion>
+
+    <artifactId>test-jackson2-config</artifactId>
+    <version>2.2.1-SNAPSHOT</version>
+
+    <dependencies>
+        <dependency>
+            <groupId>net.javacrumbs.json-unit</groupId>
+            <artifactId>test-base</artifactId>
+            <version>${project.version}</version>
+        </dependency>
+        <dependency>
+            <groupId>com.fasterxml.jackson.core</groupId>
+            <artifactId>jackson-databind</artifactId>
+            <version>${jackson2.version}</version>
+            <scope>test</scope>
+        </dependency>
+        <dependency>
+            <groupId>com.fasterxml.jackson.datatype</groupId>
+            <artifactId>jackson-datatype-jsr310</artifactId>
+            <version>${jackson2.version}</version>
+            <scope>test</scope>
+        </dependency>
+        <dependency>
+            <groupId>org.slf4j</groupId>
+            <artifactId>slf4j-simple</artifactId>
+        </dependency>
+    </dependencies>
+</project>