/*
* Copyright 2017 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.integration.support.converter;
import java.util.Collection;
import java.util.LinkedList;
import java.util.List;
import java.util.stream.Collectors;
import java.util.stream.Stream;
import org.springframework.integration.support.json.JacksonPresent;
import org.springframework.messaging.converter.ByteArrayMessageConverter;
import org.springframework.messaging.converter.CompositeMessageConverter;
import org.springframework.messaging.converter.GenericMessageConverter;
import org.springframework.messaging.converter.MappingJackson2MessageConverter;
import org.springframework.messaging.converter.MessageConverter;
/**
* A {@link CompositeMessageConverter} extension with some default {@link MessageConverter}s
* which can be overridden with the given converters
* or added in the end of target {@code converters} collection.
* <p>
* The default converts are (declared exactly in this order):
* <ul>
* <li> {@link MappingJackson2MessageConverter} if Jackson processor is present in classpath;
* <li> {@link ByteArrayMessageConverter}
* <li> {@link ObjectStringMessageConverter}
* <li> {@link GenericMessageConverter}
* </ul>
*
* @author Artem Bilan
*
* @since 5.0
*/
public class ConfigurableCompositeMessageConverter extends CompositeMessageConverter {
/**
* Create an instance with the default converters.
*/
public ConfigurableCompositeMessageConverter() {
super(initDefaults());
}
/**
* Create an instance with the given converters and without defaults.
* @param converters the converters to use
*/
public ConfigurableCompositeMessageConverter(Collection<MessageConverter> converters) {
this(converters, false);
}
/**
* Create an instance with the given converters and with defaults in the end.
* @param converters the converters to use
* @param registerDefaults register or not default converts
*/
public ConfigurableCompositeMessageConverter(Collection<MessageConverter> converters, boolean registerDefaults) {
super(registerDefaults ?
Stream.concat(converters.stream(), initDefaults().stream()).collect(Collectors.toList())
: converters);
}
private static Collection<MessageConverter> initDefaults() {
List<MessageConverter> converters = new LinkedList<>();
if (JacksonPresent.isJackson2Present()) {
converters.add(new MappingJackson2MessageConverter());
}
converters.add(new ByteArrayMessageConverter());
converters.add(new ObjectStringMessageConverter());
// TODO do we port it together with MessageConverterUtils ?
// converters.add(new JavaSerializationMessageConverter());
converters.add(new GenericMessageConverter());
return converters;
}
}