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IND2UCE :: Webproject related contents like JSON, Autoconfiguration of Spring, etc.

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/*-
 * =================================LICENSE_START=================================
 * IND2UCE
 * %%
 * Copyright (C) 2016 Fraunhofer IESE (www.iese.fraunhofer.de)
 * %%
 * The Fraunhofer-Gesellschaft zur Foerderung der angewandten Forschung e.V., Hansastrasse 27c, 80686 Munich, Germany (further: Fraunhofer) is holder of all proprietary rights on this computer program.
 * You can only use this computer program if you have closed a license agreement with Fraunhofer or you get the right to use the computer program from someone who is authorized to grant you that right.
 * Any use of the computer program without a valid license is prohibited and liable to prosecution.
 *
 * Copyright (C) 2018 Fraunhofer-Gesellschaft zur Foerderung der angewandten Forschung e.V. acting on behalf of its Fraunhofer Institute for Experimental Software Engineering (IESE)
 *
 * All rights reserved.
 *
 * Contact: [email protected]
 * =================================LICENSE_END=================================
 */

package de.fraunhofer.iese.ind2uce.json;

import com.google.gson.Gson;

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.HttpMessageNotWritableException;

import java.io.IOException;
import java.lang.reflect.Type;
import java.nio.charset.Charset;
import java.util.Arrays;
import java.util.HashSet;
import java.util.Set;

// TODO: Auto-generated Javadoc
/**
 * Implementation of
 * {@link org.springframework.http.converter.HttpMessageConverter} that can read
 * and write JSON using the
 * Google Gson library's
 * {@link Gson} class.
 * 

 * This converter can be used to bind to typed beans or untyped {@code HashMap}
 * s. By default, it supports {@code application/json} and
 * {@code application/*+json}.
 * 

 * 

 * Tested against Gson 2.3; compatible with Gson 2.0 and higher.
 * 

 *
 * @author Roy Clarkson
 * @see #setSupportedMediaTypes
 * @since 4.1
 */
public class Ind2uceConverter extends AbstractHttpMessageConverter implements GenericHttpMessageConverter {

  /** The Constant DEFAULT_CHARSET. */
  public static final Charset DEFAULT_CHARSET = Charset.forName("UTF-8");

  /** The gson converter. */
  private final GsonConverter gsonConverter;

  /** The jackson converter. */
  private final JacksonConverter jacksonConverter;

  /** The jackson classes. */
  Set> jacksonClasses = new HashSet<>();

  /**
   * Instantiates a new ind 2 uce converter.
   *
   * @param jacksonClasses the jackson classes
   */
  public Ind2uceConverter(Class... jacksonClasses) {
    super(new MediaType("application", "json", DEFAULT_CHARSET), new MediaType("application", "*+json", DEFAULT_CHARSET), new MediaType("*", "*", DEFAULT_CHARSET));
    if (jacksonClasses != null && jacksonClasses.length > 0) {
      this.jacksonClasses.addAll(Arrays.asList(jacksonClasses));
    }
    this.gsonConverter = new GsonConverter();
    this.jacksonConverter = new JacksonConverter();
  }

  /*
   * (non-Javadoc)
   * @see
   * org.springframework.http.converter.AbstractHttpMessageConverter#canRead(
   * java.lang.Class, org.springframework.http.MediaType)
   */
  @Override
  public boolean canRead(Class clazz, MediaType mediaType) {
    return this.canRead(mediaType);
  }

  /*
   * (non-Javadoc)
   * @see
   * org.springframework.http.converter.GenericHttpMessageConverter#canRead(java
   * .lang.reflect.Type, java.lang.Class, org.springframework.http.MediaType)
   */
  @Override
  public boolean canRead(Type type, Class contextClass, MediaType mediaType) {
    return this.canRead(mediaType);
  }

  /*
   * (non-Javadoc)
   * @see
   * org.springframework.http.converter.AbstractHttpMessageConverter#canWrite(
   * java.lang.Class, org.springframework.http.MediaType)
   */
  @Override
  public boolean canWrite(Class clazz, MediaType mediaType) {
    return this.canWrite(mediaType);
  }

  /*
   * (non-Javadoc)
   * @see
   * org.springframework.http.converter.GenericHttpMessageConverter#canWrite(
   * java.lang.reflect.Type, java.lang.Class,
   * org.springframework.http.MediaType)
   */
  @Override
  public boolean canWrite(Type type, Class clazz, MediaType mediaType) {
    return this.canWrite(mediaType);
  }

  /*
   * (non-Javadoc)
   * @see
   * org.springframework.http.converter.AbstractHttpMessageConverter#supports(
   * java.lang.Class)
   */
  @Override
  protected boolean supports(Class clazz) {
    throw new UnsupportedOperationException();
  }

  /*
   * (non-Javadoc)
   * @see
   * org.springframework.http.converter.GenericHttpMessageConverter#read(java.
   * lang.reflect.Type, java.lang.Class,
   * org.springframework.http.HttpInputMessage)
   */
  @Override
  public Object read(Type type, Class contextClass, HttpInputMessage inputMessage) throws IOException {
    if (this.jacksonClasses.contains(contextClass)) {
      return this.jacksonConverter.read(type, contextClass, inputMessage);
    }
    return this.gsonConverter.read(type, contextClass, inputMessage);
  }

  /*
   * (non-Javadoc)
   * @see org.springframework.http.converter.AbstractHttpMessageConverter#
   * readInternal(java.lang.Class, org.springframework.http.HttpInputMessage)
   */
  @Override
  protected Object readInternal(Class clazz, HttpInputMessage inputMessage) throws IOException {
    if (this.jacksonClasses.contains(clazz)) {
      return this.jacksonConverter.readInternal(clazz, inputMessage);
    }
    return this.gsonConverter.readInternal(clazz, inputMessage);
  }

  /*
   * (non-Javadoc)
   * @see org.springframework.http.converter.AbstractHttpMessageConverter#
   * writeInternal(java.lang.Object, org.springframework.http.HttpOutputMessage)
   */
  @Override
  protected void writeInternal(Object t, HttpOutputMessage outputMessage) throws IOException {
    if (this.jacksonClasses.contains(t.getClass())) {
      this.jacksonConverter.writeInternal(t, outputMessage);
    } else {
      this.gsonConverter.writeInternal(t, outputMessage);
    }
  }

  /*
   * (non-Javadoc)
   * @see
   * org.springframework.http.converter.GenericHttpMessageConverter#write(java.
   * lang.Object, java.lang.reflect.Type, org.springframework.http.MediaType,
   * org.springframework.http.HttpOutputMessage)
   */
  @Override
  public void write(Object arg0, Type arg1, MediaType arg2, HttpOutputMessage arg3) throws IOException, HttpMessageNotWritableException {
    if (this.jacksonClasses.contains(arg0.getClass())) {
      this.jacksonConverter.write(arg0, arg1, arg2, arg3);
    } else {
      this.gsonConverter.write(arg0, arg1, arg2, arg3);
    }

  }
}
    

    

    

            

    

            



    
    






    
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