ページの比較

Metadatas are one of the basic object in Atoms. They are wrapper around basic data types and they hinerit the basic object AtomsCore::Metadata.

The basic Metadata class has function to clone, copy, serialize etc.. to abstract the data type.

These are the basic metadata type that can be used inside Atoms:

• BoolMetadata
• BoolArrayMetadata
• IntMetadata
• IntArrayMetadata
• DoubleMetadata
• DoubleArrayMetadata
• Vector3Metadata
• Vector3ArrayMetadata
• QuaternionMetadata
• QuaternionArrayMetadata
• MatrixMetadata
• MatrixArrayMetadata
• CurveMetadata
• CurveArrayetadata
• MeshMetadata
• MeshArrayMetadata
• ImageMetadata
• PoseMetadata
• SkeletonMetadata

These are container metadata data type:

• MapMetadata
• ArrayMetadata
  
  

Creating metadatas

You can create metadata using the normal constructor of each type or you can use the metadata factory. Every metadata type as a unique typeId, it's used to register the metadata inside he metadata factory. Since the serialization code rely on this factory.

AtomsCore::IntMetadata intMeta(5);
AtomsCore::DoubleMetadata doubleMeta(654.4);

AtomsCore::MetadataFactory& factory = AtomsCore::MetadataFactory::instance();
AtomsPtr<AtomsCore::Metadata> data = factory.createMetadata(AtomsCore::Vector3Metadata::staticTypeId());

MapMetada

The MapMetadata is a map container for metadata. It can store different type od metadata at the same time. It uses strings as key.

To insert data inside a MapMetadata use the addEntry function. This function can clone the input metadata or store directly the input smart pointer, increasing the reference conunter.

AtomsCore::MapMetadata mapMeta;
// Insert element cloning the data
mapMeta.addEnetry("myKey1", &AtomsCore::IntMetadata(4));

AtomsPtr<AtomsCore::DoubleMetadata> doubleMeta(new AtomsCore::DoubleMetadata(5.7));
// Insert element cloning the data
mapMeta.addEntry("myKey2", std::static_pointer_cast<AtomsCore::Metadata>(doubleMeta), true);

AtomsPtr<AtomsCore::Vector3Metadata> vecMeta(new AtomsCore::Vector3Metadata(AtomsCore::Vector3(1,0,0));
// Insert element without cloning, copying the smart pointer and increasing the reference counter
mapMeta.addEntry("myKey3", std::static_pointer_cast<AtomsCore::Metadata>(vecMeta), false);

To get an entry from the map, use the getEntry or getTypedEntry function

AtomsPtr<AtomsCore::Vector3Metadata> vecData = mapMeta.getTypedEntry<AtomsCore::Vector3Metadata>("myKey3");
AtomsPtr<Metadata> intData = mapMeta.getEntry("myKey1");

ArrayMetadata

The array metadata si similar to the mapmetadata but it store metadata in a vector rather than a map.