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BeanFactory for configuring a Jackson ObjectMapper 

The BeanFactory makes it easier to configure a customized Jackson
ObjectMapper (for example enable/disable certain features).
This bean factory is usually used with
MappingJacksonHttpMessageConverter or MappingJacksonJsonView.
See JavaDoc for examples.

Issue: SPR-9125
This commit is contained in:
Dmitry Katsubo 2012-02-15 16:31:30 +01:00 committed by Rossen Stoyanchev
parent 5959de5d9e
commit aa415d7c0c
3 changed files with 422 additions and 0 deletions
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250
spring-web/src/main/java/org/springframework/web/context/support/JacksonObjectMapperFactoryBean.java Normal file
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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.web.context.support;
import java.text.DateFormat;
import java.text.SimpleDateFormat;
import java.util.HashMap;
import java.util.Map;
import org.codehaus.jackson.JsonGenerator;
import org.codehaus.jackson.JsonParser;
import org.codehaus.jackson.map.AnnotationIntrospector;
import org.codehaus.jackson.map.DeserializationConfig;
import org.codehaus.jackson.map.ObjectMapper;
import org.codehaus.jackson.map.SerializationConfig;
import org.springframework.beans.FatalBeanException;
import org.springframework.beans.factory.FactoryBean;
import org.springframework.beans.factory.InitializingBean;
/**
* A FactoryBean for creating a Jackson {@link ObjectMapper} with setters to
* enable or disable Jackson features from within XML configuration.
*
* <p>Example usage with MappingJacksonHttpMessageConverter:</p>
* <pre>
* &lt;bean class="org.springframework.http.converter.json.MappingJacksonHttpMessageConverter">
* &lt;property name="objectMapper">
* &lt;bean class="org.springframework.web.context.support.JacksonObjectMapperFactoryBean"
* p:autoDetectFields="false"
* p:autoDetectGettersSetters="false"
* p:annotationIntrospector-ref="jaxbAnnotationIntrospector" />
* &lt;/property>
* &lt;/bean>
* </pre>
*
* <p>Example usage with MappingJacksonJsonView:</p>
* <pre>
* &lt;bean class="org.springframework.web.servlet.view.json.MappingJacksonJsonView">
* &lt;property name="objectMapper">
* &lt;bean class="org.springframework.web.context.support.JacksonObjectMapperFactoryBean"
* p:autoDetectFields="false"
* p:autoDetectGettersSetters="false"
* p:annotationIntrospector-ref="jaxbAnnotationIntrospector" />
* &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.JacksonObjectMapperFactoryBean">
* &lt;property name="featuresToEnable">
* &lt;array>
* &lt;util:constant static-field="org.codehaus.jackson.map.SerializationConfig$Feature.WRAP_ROOT_VALUE"/>
* &lt;util:constant static-field="org.codehaus.jackson.map.SerializationConfig$Feature.CLOSE_CLOSEABLE"/>
* &lt;/array>
* &lt;/property>
* &lt;property name="featuresToDisable">
* &lt;array>
* &lt;util:constant static-field="org.codehaus.jackson.map.DeserializationConfig$Feature.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 JacksonObjectMapperFactoryBean implements FactoryBean<ObjectMapper>, InitializingBean {
private ObjectMapper objectMapper;
private Map<Object, Boolean> features = new HashMap<Object, Boolean>();
private AnnotationIntrospector annotationIntrospector;
private DateFormat dateFormat;
/**
* Set the ObjectMapper instance to use.
* If not set an instance will be created using the default constructor.
*/
public void setObjectMapper(ObjectMapper objectMapper) {
this.objectMapper = objectMapper;
}
/**
* Define annotationIntrospector for
* {@link SerializationConfig#setAnnotationIntrospector(AnnotationIntrospector)}.
*/
public void setAnnotationIntrospector(AnnotationIntrospector annotationIntrospector) {
this.annotationIntrospector = annotationIntrospector;
}
/**
* Define the date/time format with the given string, which is in turn used
* to create a {@link SimpleDateFormat}.
* @see #setDateFormat(DateFormat)
*/
public void setSimpleDateFormat(String format) {
this.dateFormat = new SimpleDateFormat(format);
}
/**
* Define the format for date/time with the given {@link DateFormat} instance.
* @see #setSimpleDateFormat(String)
*/
public void setDateFormat(DateFormat dateFormat) {
this.dateFormat = dateFormat;
}
/**
* Shortcut for {@link SerializationConfig.Feature#AUTO_DETECT_FIELDS} and
* {@link DeserializationConfig.Feature#AUTO_DETECT_FIELDS}.
*/
public void setAutoDetectFields(boolean autoDetectFields) {
this.features.put(DeserializationConfig.Feature.AUTO_DETECT_FIELDS, Boolean.valueOf(autoDetectFields));
this.features.put(SerializationConfig.Feature.AUTO_DETECT_FIELDS, Boolean.valueOf(autoDetectFields));
}
/**
* Shortcut for {@link SerializationConfig.Feature#AUTO_DETECT_GETTERS} and
* {@link DeserializationConfig.Feature#AUTO_DETECT_SETTERS}.
*/
public void setAutoDetectGettersSetters(boolean autoDetectGettersSetters) {
this.features.put(SerializationConfig.Feature.AUTO_DETECT_GETTERS, Boolean.valueOf(autoDetectGettersSetters));
this.features.put(DeserializationConfig.Feature.AUTO_DETECT_SETTERS, Boolean.valueOf(autoDetectGettersSetters));
}
/**
* Shortcut for {@link SerializationConfig.Feature#FAIL_ON_EMPTY_BEANS}.
*/
public void setFailOnEmptyBeans(boolean failOnEmptyBeans) {
this.features.put(SerializationConfig.Feature.FAIL_ON_EMPTY_BEANS, Boolean.valueOf(failOnEmptyBeans));
}
/**
* Shortcut for {@link SerializationConfig.Feature#INDENT_OUTPUT}.
*/
public void setIndentOutput(boolean indentOutput) {
this.features.put(SerializationConfig.Feature.INDENT_OUTPUT, Boolean.valueOf(indentOutput));
}
/**
* Specify features to enable.
* @see SerializationConfig.Feature
* @see DeserializationConfig.Feature
* @see JsonParser.Feature
* @see JsonGenerator.Feature
*/
public void setFeaturesToEnable(Object[] featuresToEnable) {
if (featuresToEnable == null) {
throw new FatalBeanException("featuresToEnable property should not be null");
}
for (Object feature : featuresToEnable) {
this.features.put(feature, Boolean.TRUE);
}
}
/**
* Specify features to disable.
* @see SerializationConfig.Feature
* @see DeserializationConfig.Feature
* @see JsonParser.Feature
* @see JsonGenerator.Feature
*/
public void setFeaturesToDisable(Object[] featuresToDisable) {
if (featuresToDisable == null) {
throw new FatalBeanException("featuresToDisable property should not be null");
}
for (Object feature : featuresToDisable) {
this.features.put(feature, Boolean.FALSE);
}
}
public ObjectMapper getObject() {
return this.objectMapper;
}
public Class<?> getObjectType() {
return ObjectMapper.class;
}
public boolean isSingleton() {
return true;
}
/**
* @see org.springframework.beans.factory.InitializingBean#afterPropertiesSet()
*/
public void afterPropertiesSet() throws FatalBeanException {
if (this.objectMapper == null) {
this.objectMapper = new ObjectMapper();
}
if (this.annotationIntrospector != null) {
this.objectMapper.getSerializationConfig().setAnnotationIntrospector(annotationIntrospector);
this.objectMapper.getDeserializationConfig().setAnnotationIntrospector(annotationIntrospector);
}
if (this.dateFormat != null) {
// Deprecated for 1.8+, use
// objectMapper.setDateFormat(dateFormat);
this.objectMapper.getSerializationConfig().setDateFormat(this.dateFormat);
}
for (Map.Entry<Object, Boolean> entry : features.entrySet()) {
setFeatureEnabled(entry.getKey(), entry.getValue().booleanValue());
}
}
private void setFeatureEnabled(Object feature, boolean enabled) {
if (feature instanceof DeserializationConfig.Feature) {
this.objectMapper.configure((DeserializationConfig.Feature) feature, enabled);
}
else if (feature instanceof SerializationConfig.Feature) {
this.objectMapper.configure((SerializationConfig.Feature) 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());
}
}
}

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spring-web/src/test/java/org/springframework/web/context/support/JacksonObjectMapperFactoryBeanTests.java Normal file
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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.web.context.support;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertFalse;
import static org.junit.Assert.assertNotNull;
import static org.junit.Assert.assertTrue;
import java.text.SimpleDateFormat;
import org.codehaus.jackson.JsonFactory;
import org.codehaus.jackson.JsonGenerator;
import org.codehaus.jackson.JsonParser;
import org.codehaus.jackson.map.DeserializationConfig;
import org.codehaus.jackson.map.ObjectMapper;
import org.codehaus.jackson.map.SerializationConfig;
import org.codehaus.jackson.map.introspect.NopAnnotationIntrospector;
import org.junit.Before;
import org.junit.Test;
import org.springframework.beans.FatalBeanException;
/**
* Test cases for {@link JacksonObjectMapperFactoryBean} class.
*
* @author <a href="mailto:dmitry.katsubo@gmail.com">Dmitry Katsubo</a>
*/
public class JacksonObjectMapperFactoryBeanTests {
private static final String DATE_FORMAT = "yyyy-MM-dd";
private JacksonObjectMapperFactoryBean factory;
@Before
public void setUp() {
factory = new JacksonObjectMapperFactoryBean();
}
@Test(expected=FatalBeanException.class)
public void testSetFeaturesToEnableNull() throws Exception {
factory.setFeaturesToEnable(null);
factory.setFeaturesToEnable(new Object[0]);
}
@Test(expected=FatalBeanException.class)
public void testSetFeaturesToDisableNull() {
factory.setFeaturesToDisable(null);
}
@Test
public void testSetFeaturesToEnableEmpty() {
factory.setFeaturesToEnable(new Object[0]);
factory.setFeaturesToDisable(new Object[0]);
}
@Test(expected = FatalBeanException.class)
public void testUnknownFeature() {
factory.setFeaturesToEnable(new Object[] { Boolean.TRUE });
factory.afterPropertiesSet();
}
@Test
public void testBooleanSetters() {
factory.setAutoDetectFields(false);
factory.setAutoDetectGettersSetters(false);
factory.setFailOnEmptyBeans(false);
factory.setIndentOutput(true);
factory.afterPropertiesSet();
ObjectMapper objectMapper = factory.getObject();
SerializationConfig serializeConfig = objectMapper.getSerializationConfig();
DeserializationConfig deserializeConfig = objectMapper.getDeserializationConfig();
assertFalse(serializeConfig.isEnabled(SerializationConfig.Feature.AUTO_DETECT_FIELDS));
assertFalse(deserializeConfig.isEnabled(DeserializationConfig.Feature.AUTO_DETECT_FIELDS));
assertFalse(serializeConfig.isEnabled(SerializationConfig.Feature.AUTO_DETECT_GETTERS));
assertFalse(deserializeConfig.isEnabled(DeserializationConfig.Feature.AUTO_DETECT_SETTERS));
assertFalse(serializeConfig.isEnabled(SerializationConfig.Feature.FAIL_ON_EMPTY_BEANS));
assertTrue(serializeConfig.isEnabled(SerializationConfig.Feature.INDENT_OUTPUT));
}
@Test
public void testDateTimeFormatSetter() {
SimpleDateFormat dateFormat = new SimpleDateFormat(DATE_FORMAT);
factory.setDateFormat(dateFormat);
factory.afterPropertiesSet();
assertEquals(dateFormat, factory.getObject().getSerializationConfig().getDateFormat());
}
@Test
public void testSimpleDateFormatStringSetter() {
SimpleDateFormat dateFormat = new SimpleDateFormat(DATE_FORMAT);
factory.setSimpleDateFormat(DATE_FORMAT);
factory.afterPropertiesSet();
assertEquals(dateFormat, factory.getObject().getSerializationConfig().getDateFormat());
}
@Test
public void testSimpleSetup() {
factory.afterPropertiesSet();
assertNotNull(factory.getObject());
assertTrue(factory.isSingleton());
assertEquals(ObjectMapper.class, factory.getObjectType());
}
@Test
public void testCompleteSetup() {
NopAnnotationIntrospector annotationIntrospector = new NopAnnotationIntrospector();
ObjectMapper objectMapper = new ObjectMapper();
assertTrue(factory.isSingleton());
assertEquals(ObjectMapper.class, factory.getObjectType());
factory.setObjectMapper(objectMapper);
factory.setAnnotationIntrospector(annotationIntrospector);
factory.setFeaturesToEnable(new Object[] {
SerializationConfig.Feature.FAIL_ON_EMPTY_BEANS,
DeserializationConfig.Feature.USE_ANNOTATIONS,
JsonParser.Feature.ALLOW_SINGLE_QUOTES,
JsonGenerator.Feature.WRITE_NUMBERS_AS_STRINGS
});
factory.setFeaturesToDisable(new Object[] {
SerializationConfig.Feature.AUTO_DETECT_GETTERS,
DeserializationConfig.Feature.AUTO_DETECT_FIELDS,
JsonParser.Feature.AUTO_CLOSE_SOURCE,
JsonGenerator.Feature.QUOTE_FIELD_NAMES
});
factory.afterPropertiesSet();
assertTrue(objectMapper == factory.getObject());
SerializationConfig serializeConfig = objectMapper.getSerializationConfig();
DeserializationConfig deserializeConfig = objectMapper.getDeserializationConfig();
JsonFactory jsonFactory = objectMapper.getJsonFactory();
assertTrue(annotationIntrospector == serializeConfig.getAnnotationIntrospector());
assertTrue(annotationIntrospector == deserializeConfig.getAnnotationIntrospector());
assertTrue(serializeConfig.isEnabled(SerializationConfig.Feature.FAIL_ON_EMPTY_BEANS));
assertTrue(deserializeConfig.isEnabled(DeserializationConfig.Feature.USE_ANNOTATIONS));
assertTrue(jsonFactory.isEnabled(JsonParser.Feature.ALLOW_SINGLE_QUOTES));
assertTrue(jsonFactory.isEnabled(JsonGenerator.Feature.WRITE_NUMBERS_AS_STRINGS));
assertFalse(serializeConfig.isEnabled(SerializationConfig.Feature.AUTO_DETECT_GETTERS));
assertFalse(deserializeConfig.isEnabled(DeserializationConfig.Feature.AUTO_DETECT_FIELDS));
assertFalse(jsonFactory.isEnabled(JsonParser.Feature.AUTO_CLOSE_SOURCE));
assertFalse(jsonFactory.isEnabled(JsonGenerator.Feature.QUOTE_FIELD_NAMES));
}
}

1
src/dist/changelog.txt vendored
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@ -8,6 +8,7 @@ Changes in version 3.2 M2
* spring-test module now depends on junit:junit-dep * spring-test module now depends on junit:junit-dep
* raise RestClientException instead of IllegalArgumentException for unknown status codes * raise RestClientException instead of IllegalArgumentException for unknown status codes
* add JacksonObjectMapperFactoryBean for configuring a Jackson ObjectMapper in XML
Changes in version 3.2 M1 (2012-05-28) Changes in version 3.2 M1 (2012-05-28)
-------------------------------------- --------------------------------------