com.kixeye.chassis.transport.http.SerDeHttpMessageConverter.java Source code

Introduction

Here is the source code for com.kixeye.chassis.transport.http.SerDeHttpMessageConverter.java

Source

package com.kixeye.chassis.transport.http;

/*
 * #%L
 * Chassis Transport Core
 * %%
 * Copyright (C) 2014 KIXEYE, Inc
 * %%
 * 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.
 * #L%
 */

import java.io.IOException;
import java.io.InputStream;
import java.lang.reflect.ParameterizedType;
import java.lang.reflect.Type;
import java.nio.ByteBuffer;

import org.springframework.core.io.Resource;
import org.springframework.http.HttpInputMessage;
import org.springframework.http.HttpOutputMessage;
import org.springframework.http.MediaType;
import org.springframework.http.converter.AbstractHttpMessageConverter;
import org.springframework.http.converter.GenericHttpMessageConverter;
import org.springframework.http.converter.HttpMessageNotReadableException;
import org.springframework.http.converter.HttpMessageNotWritableException;

import com.kixeye.chassis.transport.serde.MessageSerDe;

/**
 * A SerDe based message converter.
 * 
 * @author ebahtijaragic
 */
public class SerDeHttpMessageConverter extends AbstractHttpMessageConverter<Object>
        implements GenericHttpMessageConverter<Object> {
    private final MessageSerDe serDe;

    /**
     * Construct a new {@code ProtostuffJsonHttpMessageConverter}.
     */
    public SerDeHttpMessageConverter(MessageSerDe serDe) {
        super(convertMediaTypes(serDe.getSupportedMediaTypes()));
        this.serDe = serDe;
    }

    /**
     * @see org.springframework.http.converter.GenericHttpMessageConverter#canRead(java.lang.reflect.Type, java.lang.Class, org.springframework.http.MediaType)
     */
    public boolean canRead(Type type, Class<?> contextClass, MediaType mediaType) {
        return canRead(mediaType);
    }

    /**
     * @see org.springframework.http.converter.GenericHttpMessageConverter#read(java.lang.reflect.Type, java.lang.Class, org.springframework.http.HttpInputMessage)
     */
    @SuppressWarnings({ "unchecked", "rawtypes" })
    public Object read(Type type, Class<?> contextClass, HttpInputMessage inputMessage)
            throws IOException, HttpMessageNotReadableException {
        if (type instanceof ParameterizedType) {
            type = ((ParameterizedType) type).getRawType();
        }
        return serDe.deserialize(inputMessage.getBody(), (Class) type);
    }

    /**
     * Whether we support this class.
     * 
     * @param clazz
     * @return
     */
    protected boolean supports(Class<?> clazz) {
        return !(clazz.isPrimitive() || byte[].class.equals(clazz) || ByteBuffer.class.equals(clazz)
                || String.class.equals(clazz) || InputStream.class.equals(clazz) || Resource.class.equals(clazz));
    }

    /**
     * @see org.springframework.http.converter.AbstractHttpMessageConverter#readInternal(java.lang.Class, org.springframework.http.HttpInputMessage)
     */
    protected Object readInternal(Class<? extends Object> clazz, HttpInputMessage inputMessage)
            throws IOException, HttpMessageNotReadableException {
        return serDe.deserialize(inputMessage.getBody(), clazz);
    }

    /**
     * @see org.springframework.http.converter.AbstractHttpMessageConverter#writeInternal(java.lang.Object, org.springframework.http.HttpOutputMessage)
     */
    protected void writeInternal(Object t, HttpOutputMessage outputMessage)
            throws IOException, HttpMessageNotWritableException {
        serDe.serialize(t, outputMessage.getBody());
    }

    /**
     * Converts guava media types to spring media types.
     * 
     * @param inputMediaTypes
     * @return
     */
    private static MediaType[] convertMediaTypes(com.google.common.net.MediaType[] inputMediaTypes) {
        if (inputMediaTypes == null) {
            return null;
        }

        MediaType[] mediaTypes = new MediaType[inputMediaTypes.length];

        for (int i = 0; i < inputMediaTypes.length; i++) {
            mediaTypes[i] = new MediaType(inputMediaTypes[i].type(), inputMediaTypes[i].subtype());
        }

        return mediaTypes;
    }
}