BSON API Sample Code

Sample Code

The following code sample illustrates working with the API

:::c++
#include <uma/bson/Element.h>
#include <uma/bson/Document.h>
#include <uma/bson/Undefined.h>
#include <uma/bson/Date.h>
#include <uma/bson/Null.h>
#include <uma/bson/RegularExpression.h>

#include <Poco/FileStream.h>

  using uma::bson::Value;
  using uma::bson::SharedElement;
  using uma::bson::Document;
  using uma::bson::Undefined;
  using uma::bson::Date;
  using uma::bson::Null;
  using uma::bson::RegularExpression;

  Document doc; // Use Document doc( 0 ) if you do not want automatically assigned ObjectId in new document
  doc.set( "double", 1.0 );
  doc.set( "string", "string value" );
  doc.set( "undefined", Undefined() );
  doc.set( "boolean", true );
  doc.set( "date", Date() );
  doc.set( "null", Null() );
  doc.set( "regex", RegularExpression( "^abc", "$(1)" ) );
  doc.set( "integer", 1 );
  doc.set( "long", static_cast<int64_t>( 2 ) );

  // BSON IO sample
  const string out( "/tmp/doctest.bson" );
  Poco::FileOutputStream fos( out, std::ios::out | std::ios::binary | std::ios::trunc );
  doc.toBson( fos );
  fos.close();

  Document fromBson = Document::fromFile( out );
  assert( doc.get( "double" )->getValue<Double>().getValue() == 1.0 );
  assert( doc.get( "string" )->getValue<String>().getValue() == "string value" );

  auto ufields = fromBson.getFieldNames();
  for ( auto iter = fields.begin(); iter != fields.end(); ++iter )
  {
    SharedElement elem = fromBson.get( *iter );

    switch ( elem->getType() )
    {
      case Value::Type::Double: double d = elem->getValue<Double>().getValue(); break;
      default: break;
    }
  }

  // JSON IO sample
  const std::string out( "/tmp/doctest.json" );
  Poco::FileOutputStream fos( out, std::ios::out | std::ios::binary | std::ios::trunc );
  doc.toJson( fos, true );
  fos.close();

  Poco::FileInputStream fis( out );
  Document fromJson = Document::fromJson( fis );