org.springframework.amqp.support.converter.DefaultJackson2JavaTypeMapper.java Source code

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Here is the source code for org.springframework.amqp.support.converter.DefaultJackson2JavaTypeMapper.java

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/*
 * Copyright 2002-2013 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.amqp.support.converter;

import com.fasterxml.jackson.databind.JavaType;
import com.fasterxml.jackson.databind.type.CollectionType;
import com.fasterxml.jackson.databind.type.MapType;
import com.fasterxml.jackson.databind.type.TypeFactory;

import org.springframework.amqp.core.MessageProperties;
import org.springframework.util.ClassUtils;

/**
 * @author Mark Pollack
 * @author Sam Nelson
 * @author Andreas Asplund
 * @author Artem Bilan
 */
public class DefaultJackson2JavaTypeMapper extends AbstractJavaTypeMapper
        implements Jackson2JavaTypeMapper, ClassMapper {

    public JavaType toJavaType(MessageProperties properties) {
        JavaType classType = getClassIdType(retrieveHeader(properties, getClassIdFieldName()));
        if (!classType.isContainerType() || classType.isArrayType()) {
            return classType;
        }

        JavaType contentClassType = getClassIdType(retrieveHeader(properties, getContentClassIdFieldName()));
        if (classType.getKeyType() == null) {
            return CollectionType.construct(classType.getRawClass(), contentClassType);
        }

        JavaType keyClassType = getClassIdType(retrieveHeader(properties, getKeyClassIdFieldName()));
        return MapType.construct(classType.getRawClass(), keyClassType, contentClassType);

    }

    private JavaType getClassIdType(String classId) {
        if (getIdClassMapping().containsKey(classId)) {
            return TypeFactory.defaultInstance().constructType(getIdClassMapping().get(classId));
        }

        try {
            return TypeFactory.defaultInstance()
                    .constructType(ClassUtils.forName(classId, getClass().getClassLoader()));
        } catch (ClassNotFoundException e) {
            throw new MessageConversionException("failed to resolve class name. Class not found [" + classId + "]",
                    e);
        } catch (LinkageError e) {
            throw new MessageConversionException("failed to resolve class name. Linkage error [" + classId + "]",
                    e);
        }
    }

    public void fromJavaType(JavaType javaType, MessageProperties properties) {
        addHeader(properties, getClassIdFieldName(), javaType.getRawClass());

        if (javaType.isContainerType() && !javaType.isArrayType()) {
            addHeader(properties, getContentClassIdFieldName(), javaType.getContentType().getRawClass());
        }

        if (javaType.getKeyType() != null) {
            addHeader(properties, getKeyClassIdFieldName(), javaType.getKeyType().getRawClass());
        }
    }

    public void fromClass(Class<?> clazz, MessageProperties properties) {
        fromJavaType(TypeFactory.defaultInstance().constructType(clazz), properties);

    }

    public Class<?> toClass(MessageProperties properties) {
        return toJavaType(properties).getRawClass();
    }

}