org.springframework.amqp.support.converter.ProjectingMessageConverter Maven / Gradle / Ivy
/*
* Copyright 2019 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.amqp.support.converter;
import java.io.ByteArrayInputStream;
import java.lang.reflect.Type;
import org.springframework.amqp.core.Message;
import org.springframework.core.ResolvableType;
import org.springframework.data.projection.MethodInterceptorFactory;
import org.springframework.data.projection.ProjectionFactory;
import org.springframework.data.projection.SpelAwareProxyProjectionFactory;
import org.springframework.data.web.JsonProjectingMethodInterceptorFactory;
import org.springframework.util.Assert;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.jayway.jsonpath.spi.mapper.JacksonMappingProvider;
/**
* Uses a Spring Data {@link ProjectionFactory} to bind incoming messages to projection
* interfaces.
*
* @author Gary Russell
* @since 2.2
*
*/
public class ProjectingMessageConverter {
private final ProjectionFactory projectionFactory;
public ProjectingMessageConverter(ObjectMapper mapper) {
Assert.notNull(mapper, "'mapper' cannot be null");
JacksonMappingProvider provider = new JacksonMappingProvider(mapper);
MethodInterceptorFactory interceptorFactory = new JsonProjectingMethodInterceptorFactory(provider);
SpelAwareProxyProjectionFactory factory = new SpelAwareProxyProjectionFactory();
factory.registerMethodInvokerFactory(interceptorFactory);
this.projectionFactory = factory;
}
public Object convert(Message message, Type type) {
return this.projectionFactory.createProjection(ResolvableType.forType(type).resolve(Object.class),
new ByteArrayInputStream(message.getBody()));
}
}