/spring-web/src/main/java/org/springframework/http/converter/json/Jackson2ObjectMapperFactoryBean.java

/*
 * Copyright 2002-2014 the original author or authors.
 *
 * 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 org.springframework.http.converter.json;

import java.text.DateFormat;
import java.text.SimpleDateFormat;
import java.util.List;
import java.util.Map;

import com.fasterxml.jackson.annotation.JsonInclude;
import com.fasterxml.jackson.databind.AnnotationIntrospector;
import com.fasterxml.jackson.databind.DeserializationFeature;
import com.fasterxml.jackson.databind.JsonDeserializer;
import com.fasterxml.jackson.databind.JsonSerializer;
import com.fasterxml.jackson.databind.MapperFeature;
import com.fasterxml.jackson.databind.Module;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.databind.PropertyNamingStrategy;
import com.fasterxml.jackson.databind.SerializationFeature;
import com.fasterxml.jackson.dataformat.xml.XmlMapper;

import org.springframework.beans.factory.BeanClassLoaderAware;
import org.springframework.beans.factory.FactoryBean;
import org.springframework.beans.factory.InitializingBean;

/**
 * A {@link FactoryBean} for creating a Jackson 2.x {@link ObjectMapper} (default) or
 * {@link XmlMapper} ({@code createXmlMapper} property set to true) with setters
 * to enable or disable Jackson features from within XML configuration.
 *
 * <p>It customizes Jackson defaults properties with the following ones:
 * <ul>
 * <li>{@link MapperFeature#DEFAULT_VIEW_INCLUSION} is disabled</li>
 * <li>{@link DeserializationFeature#FAIL_ON_UNKNOWN_PROPERTIES} is disabled</li>
 * </ul>
 *
 * <p>Example usage with
 * {@link MappingJackson2HttpMessageConverter}:
 *
 * <pre class="code">
 * &lt;bean class="org.springframework.http.converter.json.MappingJackson2HttpMessageConverter">
 *   &lt;property name="objectMapper">
 *     &lt;bean class="org.springframework.http.converter.json.Jackson2ObjectMapperFactoryBean"
 *       p:autoDetectFields="false"
 *       p:autoDetectGettersSetters="false"
 *       p:annotationIntrospector-ref="jaxbAnnotationIntrospector" />
 *   &lt;/property>
 * &lt;/bean>
 * </pre>
 *
 * <p>Example usage with MappingJackson2JsonView:
 *
 * <pre class="code">
 * &lt;bean class="org.springframework.web.servlet.view.json.MappingJackson2JsonView">
 *   &lt;property name="objectMapper">
 *     &lt;bean class="org.springframework.http.converter.json.Jackson2ObjectMapperFactoryBean"
 *       p:failOnEmptyBeans="false"
 *       p:indentOutput="true">
 *       &lt;property name="serializers">
 *         &lt;array>
 *           &lt;bean class="org.mycompany.MyCustomSerializer" />
 *         &lt;/array>
 *       &lt;/property>
 *     &lt;/bean>
 *   &lt;/property>
 * &lt;/bean>
 * </pre>
 *
 * <p>In case there are no specific setters provided (for some rarely used options),
 * you can still use the more general methods  {@link #setFeaturesToEnable} and
 * {@link #setFeaturesToDisable}.
 *
 * <pre class="code">
 * &lt;bean class="org.springframework.http.converter.json.Jackson2ObjectMapperFactoryBean">
 *   &lt;property name="featuresToEnable">
 *     &lt;array>
 *       &lt;util:constant static-field="com.fasterxml.jackson.databind.SerializationFeature$WRAP_ROOT_VALUE"/>
 *       &lt;util:constant static-field="com.fasterxml.jackson.databind.SerializationFeature$CLOSE_CLOSEABLE"/>
 *     &lt;/array>
 *   &lt;/property>
 *   &lt;property name="featuresToDisable">
 *     &lt;array>
 *       &lt;util:constant static-field="com.fasterxml.jackson.databind.MapperFeature$USE_ANNOTATIONS"/>
 *     &lt;/array>
 *   &lt;/property>
 * &lt;/bean>
 * </pre>
 *
 * <p>In case you want to configure Jackson's {@link ObjectMapper} with a custom {@link Module},
 * you can register one or more such Modules by class name via {@link #setModulesToInstall}:
 *
 * <pre class="code">
 * &lt;bean class="org.springframework.http.converter.json.Jackson2ObjectMapperFactoryBean">
 *   &lt;property name="modulesToInstall" value="myapp.jackson.MySampleModule,myapp.jackson.MyOtherModule"/>
 * &lt;/bean
 * </pre>
 *
 * Note that Jackson's JSR-310 and Joda-Time support modules will be registered automatically
 * when available (and when Java 8 and Joda-Time themselves are available, respectively).
 *
 * <p>Tested against Jackson 2.2, 2.3 and 2.4; compatible with Jackson 2.0 and higher.
 *
 * @author <a href="mailto:dmitry.katsubo@gmail.com">Dmitry Katsubo</a>
 * @author Rossen Stoyanchev
 * @author Brian Clozel
 * @author Juergen Hoeller
 * @author Tadaya Tsuyukubo
 * @since 3.2
 */
public class Jackson2ObjectMapperFactoryBean implements FactoryBean<ObjectMapper>, BeanClassLoaderAware, InitializingBean {

	private final Jackson2ObjectMapperBuilder builder = new Jackson2ObjectMapperBuilder();

	private ObjectMapper objectMapper;


	/**
	 * Set the {@link ObjectMapper} instance to use. If not set, the {@link ObjectMapper}
	 * will be created using its default constructor.
	 */
	public void setObjectMapper(ObjectMapper objectMapper) {
		this.objectMapper = objectMapper;
	}

	/**
	 * If set to true and no custom {@link ObjectMapper} has been set, a {@link XmlMapper}
	 * will be created using its default constructor.
	 * @since 4.1
	 */
	public void setCreateXmlMapper(boolean createXmlMapper) {
		this.builder.createXmlMapper(createXmlMapper);
	}

	/**
	 * Define the format for date/time with the given {@link DateFormat}.
	 * <p>Note: Setting this property makes the exposed {@link ObjectMapper}
	 * non-thread-safe, according to Jackson's thread safety rules.
	 * @see #setSimpleDateFormat(String)
	 */
	public void setDateFormat(DateFormat dateFormat) {
		this.builder.dateFormat(dateFormat);
	}

	/**
	 * Define the date/time format with a {@link SimpleDateFormat}.
	 * <p>Note: Setting this property makes the exposed {@link ObjectMapper}
	 * non-thread-safe, according to Jackson's thread safety rules.
	 * @see #setDateFormat(DateFormat)
	 */
	public void setSimpleDateFormat(String format) {
		this.builder.simpleDateFormat(format);
	}

	/**
	 * Set an {@link AnnotationIntrospector} for both serialization and deserialization.
	 */
	public void setAnnotationIntrospector(AnnotationIntrospector annotationIntrospector) {
		this.builder.annotationIntrospector(annotationIntrospector);
	}

	/**
	 * Specify a {@link com.fasterxml.jackson.databind.PropertyNamingStrategy} to
	 * configure the {@link ObjectMapper} with.
	 * @since 4.0.2
	 */
	public void setPropertyNamingStrategy(PropertyNamingStrategy propertyNamingStrategy) {
		this.builder.propertyNamingStrategy(propertyNamingStrategy);
	}

	/**
	 * Set a custom inclusion strategy for serialization.
	 * @see com.fasterxml.jackson.annotation.JsonInclude.Include
	 */
	public void setSerializationInclusion(JsonInclude.Include serializationInclusion) {
		this.builder.serializationInclusion(serializationInclusion);
	}

	/**
	 * Configure custom serializers. Each serializer is registered for the type
	 * returned by {@link JsonSerializer#handledType()}, which must not be
	 * {@code null}.
	 * @see #setSerializersByType(Map)
	 */
	public void setSerializers(JsonSerializer<?>... serializers) {
		this.builder.serializers(serializers);
	}

	/**
	 * Configure custom serializers for the given types.
	 * @see #setSerializers(JsonSerializer...)
	 */
	public void setSerializersByType(Map<Class<?>, JsonSerializer<?>> serializers) {
		this.builder.serializersByType(serializers);
	}

	/**
	 * Configure custom deserializers for the given types.
	 */
	public void setDeserializersByType(Map<Class<?>, JsonDeserializer<?>> deserializers) {
		this.builder.deserializersByType(deserializers);
	}

	/**
	 * Add mix-in annotations to use for augmenting specified class or interface.
	 * @param mixIns Map of entries with target classes (or interface) whose annotations
	 * to effectively override as key and mix-in classes (or interface) whose
	 * annotations are to be "added" to target's annotations as value.
	 * @since 4.1.2
	 * @see com.fasterxml.jackson.databind.ObjectMapper#addMixInAnnotations(Class, Class)
	 */
	public void setMixIns(Map<Class<?>, Class<?>> mixIns) {
		this.builder.mixIns(mixIns);
	}

	/**
	 * Shortcut for {@link MapperFeature#AUTO_DETECT_FIELDS} option.
	 */
	public void setAutoDetectFields(boolean autoDetectFields) {
		this.builder.autoDetectFields(autoDetectFields);
	}

	/**
	 * Shortcut for {@link MapperFeature#AUTO_DETECT_SETTERS}/
	 * {@link MapperFeature#AUTO_DETECT_GETTERS} option.
	 */
	public void setAutoDetectGettersSetters(boolean autoDetectGettersSetters) {
		this.builder.autoDetectGettersSetters(autoDetectGettersSetters);
	}

	/**
	 * Shortcut for {@link MapperFeature#DEFAULT_VIEW_INCLUSION} option.
	 * @since 4.1
	 */
	public void setDefaultViewInclusion(boolean defaultViewInclusion) {
		this.builder.defaultViewInclusion(defaultViewInclusion);
	}

	/**
	 * Shortcut for {@link DeserializationFeature#FAIL_ON_UNKNOWN_PROPERTIES} option.
	 * @since 4.1.1
	 */
	public void setFailOnUnknownProperties(boolean failOnUnknownProperties) {
		this.builder.failOnUnknownProperties(failOnUnknownProperties);
	}

	/**
	 * Shortcut for {@link SerializationFeature#FAIL_ON_EMPTY_BEANS} option.
	 */
	public void setFailOnEmptyBeans(boolean failOnEmptyBeans) {
		this.builder.failOnEmptyBeans(failOnEmptyBeans);
	}

	/**
	 * Shortcut for {@link SerializationFeature#INDENT_OUTPUT} option.
	 */
	public void setIndentOutput(boolean indentOutput) {
		this.builder.indentOutput(indentOutput);
	}

	/**
	 * Specify features to enable.
	 * @see com.fasterxml.jackson.core.JsonParser.Feature
	 * @see com.fasterxml.jackson.core.JsonGenerator.Feature
	 * @see com.fasterxml.jackson.databind.SerializationFeature
	 * @see com.fasterxml.jackson.databind.DeserializationFeature
	 * @see com.fasterxml.jackson.databind.MapperFeature
	 */
	public void setFeaturesToEnable(Object... featuresToEnable) {
		this.builder.featuresToEnable(featuresToEnable);
	}

	/**
	 * Specify features to disable.
	 * @see com.fasterxml.jackson.core.JsonParser.Feature
	 * @see com.fasterxml.jackson.core.JsonGenerator.Feature
	 * @see com.fasterxml.jackson.databind.SerializationFeature
	 * @see com.fasterxml.jackson.databind.DeserializationFeature
	 * @see com.fasterxml.jackson.databind.MapperFeature
	 */
	public void setFeaturesToDisable(Object... featuresToDisable) {
		this.builder.featuresToDisable(featuresToDisable);
	}

	/**
	 * Set a complete list of modules to be registered with the {@link ObjectMapper}.
	 * <p>Note: If this is set, no finding of modules is going to happen - not by
	 * Jackson, and not by Spring either (see {@link #setFindModulesViaServiceLoader}).
	 * As a consequence, specifying an empty list here will suppress any kind of
	 * module detection.
	 * <p>Specify either this or {@link #setModulesToInstall}, not both.
	 * @since 4.0
	 * @see com.fasterxml.jackson.databind.Module
	 */
	public void setModules(List<Module> modules) {
		this.builder.modules(modules);
	}

	/**
	 * Specify one or more modules by class (or class name in XML),
	 * to be registered with the {@link ObjectMapper}.
	 * <p>Modules specified here will be registered in combination with
	 * Spring's autodetection of JSR-310 and Joda-Time, or Jackson's
	 * finding of modules (see {@link #setFindModulesViaServiceLoader}).
	 * <p>Specify either this or {@link #setModules}, not both.
	 * @since 4.0.1
	 * @see com.fasterxml.jackson.databind.Module
	 */
	public void setModulesToInstall(Class<? extends Module>... modules) {
		this.builder.modulesToInstall(modules);
	}

	/**
	 * Set whether to let Jackson find available modules via the JDK ServiceLoader,
	 * based on META-INF metadata in the classpath. Requires Jackson 2.2 or higher.
	 * <p>If this mode is not set, Spring's Jackson2ObjectMapperFactoryBean itself
	 * will try to find the JSR-310 and Joda-Time support modules on the classpath -
	 * provided that Java 8 and Joda-Time themselves are available, respectively.
	 * @since 4.0.1
	 * @see com.fasterxml.jackson.databind.ObjectMapper#findModules()
	 */
	public void setFindModulesViaServiceLoader(boolean findModules) {
		this.builder.findModulesViaServiceLoader(findModules);
	}

	@Override
	public void setBeanClassLoader(ClassLoader beanClassLoader) {
		this.builder.moduleClassLoader(beanClassLoader);
	}


	@Override
	@SuppressWarnings("unchecked")
	public void afterPropertiesSet() {
		if (this.objectMapper != null) {
			this.builder.configure(this.objectMapper);
		}
		else {
			this.objectMapper = this.builder.build();
		}
	}


	/**
	 * Return the singleton ObjectMapper.
	 */
	@Override
	public ObjectMapper getObject() {
		return this.objectMapper;
	}

	@Override
	public Class<?> getObjectType() {
		return (this.objectMapper != null ? this.objectMapper.getClass() : null);
	}

	@Override
	public boolean isSingleton() {
		return true;
	}

}