void generateMetadata(MetadataStream& mdStream)
{
mdStream.remove();
mdStream.save();
mdStream.close();
mdStream.reopen(MetadataStream::OpenModeFlags::Update);
// Create a GPS metadata field descriptions
shared_ptr<MetadataSchema> gpsSchema(new MetadataSchema(GPS_SCHEMA_NAME));
UMF_METADATA_BEGIN(GPS_DESC);
UMF_FIELD_REAL(GPS_COORD_LAT_FIELD);
UMF_FIELD_REAL(GPS_COORD_LNG_FIELD);
UMF_METADATA_END(gpsSchema);
cout << "Adding metadata schema '" << GPS_SCHEMA_NAME << "':" << endl;
// Add schema to metadata stream
mdStream.addSchema(gpsSchema);
shared_ptr<Metadata> gpsMetadata;
// Let there be an UFO moving around some point on Earth
const int nPoints = 1<<10;
for(int i = 0; i < nPoints; i++)
{
float lat = float( 37.235 + cos(i/25.0*2.0*PI) * 0.001);
float lng = float(-115.811 + sin(i/25.0*2.0*PI) * 0.001);
long long time = i;
if (i<3) cout << "\t[" << i << "] 'lat " << lat << " lng " << lng << '\'' << " time " << time << endl;
else cout << '.';
// Create a metadata item
gpsMetadata = shared_ptr<Metadata>(new Metadata(gpsSchema->findMetadataDesc(GPS_DESC)));
// Fill item fields
gpsMetadata->push_back(FieldValue(GPS_COORD_LAT_FIELD, lat));
gpsMetadata->push_back(FieldValue(GPS_COORD_LNG_FIELD, lng));
gpsMetadata->setTimestamp(time);
// Add to metadata a new item
mdStream.add(gpsMetadata);
}
cout << "\n\t" << nPoints << " items." << endl;
}
void generateEncryptedMetadata(MetadataStream &mdStream, EncryptionScope scope)
{
mdStream.remove();
mdStream.save();
mdStream.close();
mdStream.reopen(MetadataStream::OpenModeFlags::Update);
// Create a GPS metadata field descriptions
shared_ptr<MetadataSchema> gpsSchema(new MetadataSchema(GPS_SCHEMA_NAME));
UMF_METADATA_BEGIN(GPS_DESC);
UMF_FIELD_REAL(GPS_COORD_LAT_FIELD);
UMF_FIELD_REAL(GPS_COORD_LNG_FIELD);
UMF_METADATA_END(gpsSchema);
//set encryption for all fields/metadata/schema/stream
std::shared_ptr< MetadataDesc > metadesc = gpsSchema->findMetadataDesc(GPS_DESC);
FieldDesc& field = metadesc->getFieldDesc(GPS_COORD_LNG_FIELD);
if(scope == EncryptionScope::Whole)
{
mdStream.setUseEncryption(true);
}
else if(scope == EncryptionScope::AllSchema)
{
gpsSchema->setUseEncryption(true);
}
else if(scope == EncryptionScope::AllMetaDesc)
{
metadesc->setUseEncryption(true);
}
else if(scope == EncryptionScope::AllFieldDesc)
{
field.useEncryption = true;
}
cout << "Adding metadata schema '" << GPS_SCHEMA_NAME << "':" << endl;
// Add schema to metadata stream
mdStream.addSchema(gpsSchema);
shared_ptr<Metadata> gpsMetadata;
// Let there be an UFO moving around some point on Earth
const int nPoints = 1<<10;
for(int i = 0; i < nPoints; i++)
{
float lat = float( 37.235 + cos(i/25.0*2.0*PI) * 0.001);
float lng = float(-115.811 + sin(i/25.0*2.0*PI) * 0.001);
long long time = i;
if (i<3) cout << "\t[" << i << "] 'lat " << lat << " lng " << lng << '\'' << " time " << time << endl;
else cout << '.';
// Create a metadata item
gpsMetadata = shared_ptr<Metadata>(new Metadata(gpsSchema->findMetadataDesc(GPS_DESC)));
//Encrypt specified fields/records or not
bool encryptRecord = false, encryptField = false;
if(i == 0)
{
if(scope == EncryptionScope::OneField)
{
encryptField = true;
}
if(scope == EncryptionScope::OneMetadata)
{
encryptRecord = true;
}
}
// Fill item fields
gpsMetadata->push_back(FieldValue(GPS_COORD_LAT_FIELD, lat, encryptField));
gpsMetadata->push_back(FieldValue(GPS_COORD_LNG_FIELD, lng));
gpsMetadata->setTimestamp(time);
gpsMetadata->setUseEncryption(encryptRecord);
// Add to metadata a new item
mdStream.add(gpsMetadata);
}
cout << "\n\t" << nPoints << " items." << endl;
}