org.springframework.boot.jackson.JsonMixinModule Maven / Gradle / Ivy
/*
* Copyright 2012-2022 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
*
* https://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.boot.jackson;
import java.util.Collection;
import com.fasterxml.jackson.databind.Module;
import com.fasterxml.jackson.databind.module.SimpleModule;
import org.springframework.beans.factory.InitializingBean;
import org.springframework.beans.factory.annotation.AnnotatedBeanDefinition;
import org.springframework.beans.factory.config.BeanDefinition;
import org.springframework.context.ApplicationContext;
import org.springframework.context.annotation.ClassPathScanningCandidateComponentProvider;
import org.springframework.core.annotation.MergedAnnotation;
import org.springframework.core.annotation.MergedAnnotations;
import org.springframework.core.type.filter.AnnotationTypeFilter;
import org.springframework.util.Assert;
import org.springframework.util.ClassUtils;
import org.springframework.util.ObjectUtils;
import org.springframework.util.StringUtils;
/**
* Spring Bean and Jackson {@link Module} to find and
* {@link SimpleModule#setMixInAnnotation(Class, Class) register}
* {@link JsonMixin @JsonMixin}-annotated classes.
*
* @author Guirong Hu
* @since 2.7.0
* @see JsonMixin
*/
public class JsonMixinModule extends SimpleModule implements InitializingBean {
private final ApplicationContext context;
private final Collection basePackages;
/**
* Create a new {@link JsonMixinModule} instance.
* @param context the source application context
* @param basePackages the packages to check for annotated classes
*/
public JsonMixinModule(ApplicationContext context, Collection basePackages) {
Assert.notNull(context, "Context must not be null");
this.context = context;
this.basePackages = basePackages;
}
@Override
public void afterPropertiesSet() throws Exception {
if (ObjectUtils.isEmpty(this.basePackages)) {
return;
}
JsonMixinComponentScanner scanner = new JsonMixinComponentScanner();
scanner.setEnvironment(this.context.getEnvironment());
scanner.setResourceLoader(this.context);
for (String basePackage : this.basePackages) {
if (StringUtils.hasText(basePackage)) {
for (BeanDefinition candidate : scanner.findCandidateComponents(basePackage)) {
addJsonMixin(ClassUtils.forName(candidate.getBeanClassName(), this.context.getClassLoader()));
}
}
}
}
private void addJsonMixin(Class mixinClass) {
MergedAnnotation annotation = MergedAnnotations
.from(mixinClass, MergedAnnotations.SearchStrategy.TYPE_HIERARCHY).get(JsonMixin.class);
for (Class targetType : annotation.getClassArray("type")) {
setMixInAnnotation(targetType, mixinClass);
}
}
static class JsonMixinComponentScanner extends ClassPathScanningCandidateComponentProvider {
JsonMixinComponentScanner() {
addIncludeFilter(new AnnotationTypeFilter(JsonMixin.class));
}
@Override
protected boolean isCandidateComponent(AnnotatedBeanDefinition beanDefinition) {
return true;
}
}
}