Android Open Source - spring-sync Json Patch Http Message Converter

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License

The source code is released under:

Apache License

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Java Source Code

/*
 * Copyright 2014 the original author or authors.
 *//  ww  w . ja  va  2s.  c o m
 * 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.sync.diffsync.web;

import java.io.IOException;
import java.util.Arrays;

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.HttpMessageConverter;
import org.springframework.http.converter.HttpMessageNotReadableException;
import org.springframework.http.converter.HttpMessageNotWritableException;
import org.springframework.sync.Patch;
import org.springframework.sync.json.JsonPatchPatchConverter;

import com.fasterxml.jackson.databind.ObjectMapper;

/**
 * {@link HttpMessageConverter} that converts "application/json-patch+json" payloads to/from {@link Patch} objects.
 * @author Craig Walls
 */
public class JsonPatchHttpMessageConverter extends AbstractHttpMessageConverter<Patch> {

  private static final MediaType JSON_PATCH = new MediaType("application", "json-patch+json");

  private static final ObjectMapper MAPPER = new ObjectMapper();

  private JsonPatchPatchConverter jsonPatchMaker;

  public JsonPatchHttpMessageConverter() {
    setSupportedMediaTypes(Arrays.asList(JSON_PATCH));
    this.jsonPatchMaker = new JsonPatchPatchConverter();
  }
  
  @Override
  protected boolean supports(Class<?> clazz) {
    return Patch.class.isAssignableFrom(clazz);
  }

  @Override
  protected Patch readInternal(Class<? extends Patch> clazz, HttpInputMessage inputMessage) throws IOException, HttpMessageNotReadableException {
    return jsonPatchMaker.convert(MAPPER.readTree(inputMessage.getBody()));
  }

  @Override
  protected void writeInternal(Patch patch, HttpOutputMessage outputMessage) throws IOException, HttpMessageNotWritableException {
    outputMessage.getHeaders().setContentType(JSON_PATCH);
    MAPPER.writer().writeValue(outputMessage.getBody(), jsonPatchMaker.convert(patch));
  }

}

Java Source Code List