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/*******************************************************************************
 * Copyright (c) 2018, TechEmpower, Inc.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *     * Redistributions of source code must retain the above copyright
 *       notice, this list of conditions and the following disclaimer.
 *     * Redistributions in binary form must reproduce the above copyright
 *       notice, this list of conditions and the following disclaimer in the
 *       documentation and/or other materials provided with the distribution.
 *     * Neither the name TechEmpower, Inc. nor the names of its
 *       contributors may be used to endorse or promote products derived from
 *       this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL TECHEMPOWER, INC. BE LIABLE FOR ANY DIRECT,
 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
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 *******************************************************************************/
package com.techempower.js;

import java.io.*;

import com.fasterxml.jackson.core.*;
import com.fasterxml.jackson.databind.*;

/**
 * Uses the Jackson JSON serialization library to write Java objects to
 * JSON. 
 */
public class   JacksonJavaScriptWriter
    implements JavaScriptWriter {

  private final ObjectMapper mapper;

  /**
   * Constructor.
   */
  public JacksonJavaScriptWriter() {
    this(new ObjectMapper());
  }
  
  /**
   * Constructor.
   */
  public JacksonJavaScriptWriter(ObjectMapper objectMapper) {
    mapper = objectMapper;
  }
  
  @Override
  public String write(Object object) {
    try {
      return mapper.writeValueAsString(object);
    }
    catch (JsonProcessingException jpexc) {
      throw new JavaScriptError("Jackson exception.", jpexc);
    }
  }

  @Override
  public void write(Object object, Appendable out) throws IOException {
    try {
      if (out instanceof Writer) {
        mapper.writeValue((Writer)out, object);
      }
      else {
        out.append(mapper.writeValueAsString(out));
      }
    }
    catch (JsonProcessingException jpexc) {
      throw new JavaScriptError("Jackson exception.", jpexc);
    }
  }

}