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Add Jackson2ObjectMapperBeanFactory

Issue: SPR-9739
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dmak authored and rstoyanchev committed Aug 29, 2012
1 parent 76e28cb commit 950786a8cc1a83dde6e590f59958f9ada8699288
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/*
* Copyright 2002-2012 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.HashMap;
import java.util.LinkedHashMap;
import java.util.Map;
import org.springframework.beans.FatalBeanException;
import org.springframework.beans.factory.FactoryBean;
import org.springframework.beans.factory.InitializingBean;
import org.springframework.util.Assert;
import com.fasterxml.jackson.core.JsonGenerator;
import com.fasterxml.jackson.core.JsonParser;
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.ObjectMapper;
import com.fasterxml.jackson.databind.SerializationFeature;
import com.fasterxml.jackson.databind.module.SimpleModule;
/**
* A FactoryBean for creating a Jackson {@link ObjectMapper} with setters to
* enable or disable Jackson features from within XML configuration.
*
* <p>Example usage with
* {@link org.springframework.http.converter.json.MappingJackson2HttpMessageConverter}:
*
* <pre>
* &lt;bean class="org.springframework.http.converter.json.MappingJackson2HttpMessageConverter">
* &lt;property name="objectMapper">
* &lt;bean class="org.springframework.web.context.support.Jackson2ObjectMapperFactoryBean"
* p:autoDetectFields="false"
* p:autoDetectGettersSetters="false"
* p:annotationIntrospector-ref="jaxbAnnotationIntrospector" />
* &lt;/property>
* &lt;/bean>
* </pre>
*
* <p>Example usage with {@link org.springframework.web.servlet.view.json.MappingJackson2JsonView}:
*
* <pre>
* &lt;bean class="org.springframework.web.servlet.view.json.MappingJackson2JsonView">
* &lt;property name="objectMapper">
* &lt;bean class="org.springframework.web.context.support.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(Object[])} and {@link #setFeaturesToDisable(Object[])}.
*
* <pre>
* &lt;bean class="org.springframework.web.context.support.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>Note: This BeanFctory is singleton, so if you need more than one you'll need
* to configure multiple instances.
*
* @author <a href="mailto:dmitry.katsubo@gmail.com">Dmitry Katsubo</a>
* @author Rossen Stoyanchev
*
* @since 3.2
*/
public class Jackson2ObjectMapperFactoryBean implements FactoryBean<ObjectMapper>, InitializingBean {
private ObjectMapper objectMapper;
private Map<Object, Boolean> features = new HashMap<Object, Boolean>();
private DateFormat dateFormat;
private AnnotationIntrospector annotationIntrospector;
private final Map<Class<?>, JsonSerializer<?>> serializers = new LinkedHashMap<Class<?>, JsonSerializer<?>>();
private final Map<Class<?>, JsonDeserializer<?>> deserializers = new LinkedHashMap<Class<?>, JsonDeserializer<?>>();
/**
* Set the ObjectMapper instance to use. If not set, the ObjectMapper will
* be created using its default constructor.
*/
public void setObjectMapper(ObjectMapper objectMapper) {
this.objectMapper = objectMapper;
}
/**
* Define the format for date/time with the given {@link DateFormat}.
* @see #setSimpleDateFormat(String)
*/
public void setDateFormat(DateFormat dateFormat) {
this.dateFormat = dateFormat;
}
/**
* Define the date/time format with a {@link SimpleDateFormat}.
* @see #setDateFormat(DateFormat)
*/
public void setSimpleDateFormat(String format) {
this.dateFormat = new SimpleDateFormat(format);
}
/**
* Set the {@link AnnotationIntrospector} for both serialization and
* deserialization.
*/
public void setAnnotationIntrospector(AnnotationIntrospector annotationIntrospector) {
this.annotationIntrospector = annotationIntrospector;
}
/**
* 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) {
if (serializers != null) {
for (JsonSerializer<?> serializer : serializers) {
Class<?> handledType = serializer.handledType();
Assert.isTrue(handledType != null && handledType != Object.class,
"Unknown handled type in " + serializer.getClass().getName());
this.serializers.put(serializer.handledType(), serializer);
}
}
}
/**
* Configure custom serializers for the given types.
* @see #setSerializers(JsonSerializer...)
*/
public void setSerializersByType(Map<Class<?>, JsonSerializer<?>> serializers) {
if (serializers != null) {
this.serializers.putAll(serializers);
}
}
/**
* Configure custom deserializers for the given types.
*/
public void setDeserializersByType(Map<Class<?>, JsonDeserializer<?>> deserializers) {
if (deserializers != null) {
this.deserializers.putAll(deserializers);
}
}
/**
* Shortcut for {@link MapperFeature#AUTO_DETECT_FIELDS} option.
*/
public void setAutoDetectFields(boolean autoDetectFields) {
this.features.put(MapperFeature.AUTO_DETECT_FIELDS, autoDetectFields);
}
/**
* Shortcut for {@link MapperFeature#AUTO_DETECT_SETTERS}/
* {@link MapperFeature#AUTO_DETECT_GETTERS} option.
*/
public void setAutoDetectGettersSetters(boolean autoDetectGettersSetters) {
this.features.put(MapperFeature.AUTO_DETECT_SETTERS, autoDetectGettersSetters);
this.features.put(MapperFeature.AUTO_DETECT_GETTERS, autoDetectGettersSetters);
}
/**
* Shortcut for {@link SerializationFeature#FAIL_ON_EMPTY_BEANS} option.
*/
public void setFailOnEmptyBeans(boolean failOnEmptyBeans) {
this.features.put(SerializationFeature.FAIL_ON_EMPTY_BEANS, failOnEmptyBeans);
}
/**
* Shortcut for {@link SerializationFeature#INDENT_OUTPUT} option.
*/
public void setIndentOutput(boolean indentOutput) {
this.features.put(SerializationFeature.INDENT_OUTPUT, indentOutput);
}
/**
* Specify features to enable.
*
* @see MapperFeature
* @see SerializationFeature
* @see DeserializationFeature
* @see JsonParser.Feature
* @see JsonGenerator.Feature
*/
public void setFeaturesToEnable(Object... featuresToEnable) {
if (featuresToEnable != null) {
for (Object feature : featuresToEnable) {
this.features.put(feature, Boolean.TRUE);
}
}
}
/**
* Specify features to disable.
*
* @see MapperFeature
* @see SerializationFeature
* @see DeserializationFeature
* @see JsonParser.Feature
* @see JsonGenerator.Feature
*/
public void setFeaturesToDisable(Object... featuresToDisable) {
if (featuresToDisable != null) {
for (Object feature : featuresToDisable) {
this.features.put(feature, Boolean.FALSE);
}
}
}
public void afterPropertiesSet() throws FatalBeanException {
if (this.objectMapper == null) {
this.objectMapper = new ObjectMapper();
}
if (this.dateFormat != null) {
this.objectMapper.setDateFormat(this.dateFormat);
}
if (this.serializers != null || this.deserializers != null) {
SimpleModule module = new SimpleModule();
addSerializers(module);
addDeserializers(module);
this.objectMapper.registerModule(module);
}
if (this.annotationIntrospector != null) {
this.objectMapper.setAnnotationIntrospector(this.annotationIntrospector);
}
for (Object feature : this.features.keySet()) {
configureFeature(feature, this.features.get(feature));
}
}
@SuppressWarnings("unchecked")
private <T> void addSerializers(SimpleModule module) {
for (Class<?> type : this.serializers.keySet()) {
module.addSerializer((Class<? extends T>) type, (JsonSerializer<T>) this.serializers.get(type));
}
}
@SuppressWarnings("unchecked")
private <T> void addDeserializers(SimpleModule module) {
for (Class<?> type : this.deserializers.keySet()) {
module.addDeserializer((Class<T>) type, (JsonDeserializer<? extends T>) this.deserializers.get(type));
}
}
private void configureFeature(Object feature, boolean enabled) {
if (feature instanceof MapperFeature) {
this.objectMapper.configure((MapperFeature) feature, enabled);
}
else if (feature instanceof DeserializationFeature) {
this.objectMapper.configure((DeserializationFeature) feature, enabled);
}
else if (feature instanceof SerializationFeature) {
this.objectMapper.configure((SerializationFeature) feature, enabled);
}
else if (feature instanceof JsonParser.Feature) {
this.objectMapper.configure((JsonParser.Feature) feature, enabled);
}
else if (feature instanceof JsonGenerator.Feature) {
this.objectMapper.configure((JsonGenerator.Feature) feature, enabled);
}
else {
throw new FatalBeanException("Unknown feature class " + feature.getClass().getName());
}
}
/**
* Return the singleton ObjectMapper.
*/
public ObjectMapper getObject() {
return this.objectMapper;
}
public Class<?> getObjectType() {
return ObjectMapper.class;
}
public boolean isSingleton() {
return true;
}
}
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