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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);
    }
  }

}