package com.rubiconred.osb.gzip;

import org.apache.xmlbeans.*;
import java.io.*;
import java.util.zip.GZIPInputStream;
import java.util.zip.GZIPOutputStream;

public class GzipAdapter {
  
  public static XmlObject readGzipObject(Object param) 
    throws IOException, XmlException 
  {
    byte[] bytes = (byte[]) param;
    if (bytes != null) {
      InputStream input input = new ByteArrayInputStream(bytes);
      InputStream gzipInput = new GZIPInputStream(input);

      Writer writer = new StringWriter();
      char[] buffer = new char[1024];

      try {
        BufferedReader reader = new BufferedReader(new InputStreamReader(gzipInput, "UTF-8"));

        int n;
        while ((n = reader.read(buffer)) != -1)
          writer.write(buffer, 0, n);
      } finally {
        gzipInput.close();
      }

      // return the contents of the file
      return XmlObject.Factory.parse(writer.toString());
    } else {
      // input parameter is null, return null
      return null;
    }
  }

  public static byte[] writeGzipObject(XmlObject input) throws IOException, XmlException 
  {
    ByteArrayOutputStream output = new ByteArrayOutputStream();
    GZIPOutputStream gzipOutput = new GZIPOutputStream(output);

    input.save(gzipOutput);
    gzipOutput.close();

    return output.toByteArray();
  }
}