core/sql/qms/qrtest.cpp

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// Licensed to the Apache Software Foundation (ASF) under one
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#include <stdio.h>
#include "XMLUtil.h"
#include "QRDescriptor.h"
#include "QRLogger.h"

/**
 * \file
 * A simple test application for serializing and deserializing XML documents
 * containing Query Rewrite descriptors. The test file, which contains the XML
 * for a descriptor, is hard-coded into the source. When the program is run, the
 * document is parsed, creating the corresponding hierarchy of element instances.
 * The XML document is then regenerated from those instances.
 */

// Static logger instance used within this file.
static QRLogger& logger = QRLogger::instance();

void output(char* text)
{
  printf("%s\n", text);
}

void testXML()
{
  char inbuf[10000];
  XMLFormattedString outbuf;
  char *ptr = inbuf;
  //char fileName[] = "w:\\qms\\qrydesc.xml";
  //char fileName[] = "w:\\qms\\mvdesc.xml";
  char fileName[] = "w:\\qms\\resdesc.xml";
  FILE *fp = fopen(fileName, "r");
  if (!fp)
    {
      output("Could not open xml file for input");
      return;
    }
  else
    logger.log("Using input file %s", fileName);

  size_t len = fread(inbuf, 1, sizeof(inbuf), fp);
  if (len >= sizeof(inbuf))
    output("Buffer overflow reading xml file");

  NAHeap xmlParseHeap("XML Parse Heap",
                      NAMemory::DERIVED_FROM_SYS_HEAP,
                      (Lng32)32768);

  try
    {
      QRElementMapper em;
      XMLDocument doc = XMLDocument(&xmlParseHeap, em);
      XMLElementPtr descriptor = doc.parse(inbuf, (Lng32)len, 1);
      if (!descriptor)
        {
          output("XMLDocument.parse() returned NULL");
        }
      else
        {
          descriptor->toXML(outbuf);
          output("Regurgitated xml:");
          output((char*)outbuf.data());
          FILE *outfp = fopen("w:\\qms\\desc_out.xml", "w");
          fwrite(outbuf.data(), 1, outbuf.length(), outfp);
        }
      deletePtr(descriptor);
   }
  catch (XMLException& ex)
    {
      output(ex.getMessage());
    }
  catch (QRDescriptorException& ex)
    {
      output(ex.getMessage());
    }
  catch (...)
    {
      output("Unknown exception occurred");
    }
}

Int32 main()
{
  testXML();
  return 0;
}