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Metadata.h
Go to the documentation of this file.
// Copyright Contributors to the OpenVDB Project
// SPDX-License-Identifier: MPL-2.0
#ifndef OPENVDB_METADATA_HAS_BEEN_INCLUDED
#define OPENVDB_METADATA_HAS_BEEN_INCLUDED
#include "version.h"
#include "Exceptions.h"
#include "Types.h"
#include "math/Math.h" // for math::isZero()
#include "util/Name.h"
#include <cstdint>
#include <iostream>
#include <string>
#include <vector>
namespace openvdb {
OPENVDB_USE_VERSION_NAMESPACE
namespace OPENVDB_VERSION_NAME {
/// @brief Base class for storing metadata information in a grid.
class OPENVDB_API Metadata
{
public:
using Ptr = SharedPtr<Metadata>;
using ConstPtr = SharedPtr<const Metadata>;
Metadata() {}
virtual ~Metadata() {}
// Disallow copying of instances of this class.
Metadata(const Metadata&) = delete;
Metadata& operator=(const Metadata&) = delete;
/// Return the type name of the metadata.
virtual Name typeName() const = 0;
/// Return a copy of the metadata.
virtual Metadata::Ptr copy() const = 0;
/// Copy the given metadata into this metadata.
virtual void copy(const Metadata& other) = 0;
/// Return a textual representation of this metadata.
virtual std::string str() const = 0;
/// Return the boolean representation of this metadata (empty strings
/// and zeroVals evaluate to false; most other values evaluate to true).
virtual bool asBool() const = 0;
/// Return @c true if the given metadata is equivalent to this metadata.
bool operator==(const Metadata& other) const;
/// Return @c true if the given metadata is different from this metadata.
bool operator!=(const Metadata& other) const { return !(*this == other); }
/// Return the size of this metadata in bytes.
virtual Index32 size() const = 0;
/// Unserialize this metadata from a stream.
void read(std::istream&);
/// Serialize this metadata to a stream.
void write(std::ostream&) const;
/// Create new metadata of the given type.
static Metadata::Ptr createMetadata(const Name& typeName);
/// Return @c true if the given type is known by the metadata type registry.
static bool isRegisteredType(const Name& typeName);
/// Clear out the metadata registry.
static void clearRegistry();
/// Register the given metadata type along with a factory function.
static void registerType(const Name& typeName, Metadata::Ptr (*createMetadata)());
static void unregisterType(const Name& typeName);
protected:
/// Read the size of the metadata from a stream.
static Index32 readSize(std::istream&);
/// Write the size of the metadata to a stream.
void writeSize(std::ostream&) const;
/// Read the metadata from a stream.
virtual void readValue(std::istream&, Index32 numBytes) = 0;
/// Write the metadata to a stream.
virtual void writeValue(std::ostream&) const = 0;
};
/// @brief Subclass to hold raw data of an unregistered type
class OPENVDB_API UnknownMetadata: public Metadata
{
public:
using ByteVec = std::vector<uint8_t>;
explicit UnknownMetadata(const Name& typ = "<unknown>"): mTypeName(typ) {}
Name typeName() const override { return mTypeName; }
Metadata::Ptr copy() const override;
void copy(const Metadata&) override;
std::string str() const override { return (mBytes.empty() ? "" : "<binary data>"); }
bool asBool() const override { return !mBytes.empty(); }
Index32 size() const override { return static_cast<Index32>(mBytes.size()); }
void setValue(const ByteVec& bytes) { mBytes = bytes; }
const ByteVec& value() const { return mBytes; }
protected:
void readValue(std::istream&, Index32 numBytes) override;
void writeValue(std::ostream&) const override;
private:
Name mTypeName;
ByteVec mBytes;
};
/// @brief Templated metadata class to hold specific types.
template<typename T>
class TypedMetadata: public Metadata
{
public:
using Ptr = SharedPtr<TypedMetadata<T>>;
using ConstPtr = SharedPtr<const TypedMetadata<T>>;
TypedMetadata();
TypedMetadata(const T& value);
TypedMetadata(const TypedMetadata<T>& other);
~TypedMetadata() override;
Name typeName() const override;
Metadata::Ptr copy() const override;
void copy(const Metadata& other) override;
std::string str() const override;
bool asBool() const override;
Index32 size() const override { return static_cast<Index32>(sizeof(T)); }
/// Set this metadata's value.
void setValue(const T&);
/// Return this metadata's value.
T& value();
const T& value() const;
// Static specialized function for the type name. This function must be
// template specialized for each type T.
static Name staticTypeName() { return typeNameAsString<T>(); }
/// Create new metadata of this type.
static Metadata::Ptr createMetadata();
static void registerType();
static void unregisterType();
static bool isRegisteredType();
protected:
void readValue(std::istream&, Index32 numBytes) override;
void writeValue(std::ostream&) const override;
private:
T mValue;
};
/// Write a Metadata to an output stream
std::ostream& operator<<(std::ostream& ostr, const Metadata& metadata);
////////////////////////////////////////
inline void
Metadata::writeSize(std::ostream& os) const
{
const Index32 n = this->size();
os.write(reinterpret_cast<const char*>(&n), sizeof(Index32));
}
inline Index32
Metadata::readSize(std::istream& is)
{
Index32 n = 0;
is.read(reinterpret_cast<char*>(&n), sizeof(Index32));
return n;
}
inline void
Metadata::read(std::istream& is)
{
const Index32 numBytes = this->readSize(is);
this->readValue(is, numBytes);
}
inline void
Metadata::write(std::ostream& os) const
{
this->writeSize(os);
this->writeValue(os);
}
////////////////////////////////////////
template <typename T>
inline
TypedMetadata<T>::TypedMetadata() : mValue(T())
{
}
template <typename T>
inline
TypedMetadata<T>::TypedMetadata(const T &value) : mValue(value)
{
}
template <typename T>
inline
TypedMetadata<T>::TypedMetadata(const TypedMetadata<T> &other) :
Metadata(),
mValue(other.mValue)
{
}
template <typename T>
inline
TypedMetadata<T>::~TypedMetadata()
{
}
template <typename T>
inline Name
TypedMetadata<T>::typeName() const
{
return TypedMetadata<T>::staticTypeName();
}
template <typename T>
inline void
TypedMetadata<T>::setValue(const T& val)
{
mValue = val;
}
template <typename T>
inline T&
TypedMetadata<T>::value()
{
return mValue;
}
template <typename T>
inline const T&
TypedMetadata<T>::value() const
{
return mValue;
}
template <typename T>
inline Metadata::Ptr
TypedMetadata<T>::copy() const
{
Metadata::Ptr metadata(new TypedMetadata<T>());
metadata->copy(*this);
return metadata;
}
template <typename T>
inline void
TypedMetadata<T>::copy(const Metadata &other)
{
const TypedMetadata<T>* t = dynamic_cast<const TypedMetadata<T>*>(&other);
if (t == nullptr) OPENVDB_THROW(TypeError, "Incompatible type during copy");
mValue = t->mValue;
}
template<typename T>
inline void
TypedMetadata<T>::readValue(std::istream& is, Index32 /*numBytes*/)
{
//assert(this->size() == numBytes);
is.read(reinterpret_cast<char*>(&mValue), this->size());
}
template<typename T>
inline void
TypedMetadata<T>::writeValue(std::ostream& os) const
{
os.write(reinterpret_cast<const char*>(&mValue), this->size());
}
template <typename T>
inline std::string
TypedMetadata<T>::str() const
{
std::ostringstream ostr;
ostr << mValue;
return ostr.str();
}
template<typename T>
inline bool
TypedMetadata<T>::asBool() const
{
return !math::isZero(mValue);
}
template <typename T>
inline Metadata::Ptr
TypedMetadata<T>::createMetadata()
{
Metadata::Ptr ret(new TypedMetadata<T>());
return ret;
}
template <typename T>
inline void
TypedMetadata<T>::registerType()
{
Metadata::registerType(TypedMetadata<T>::staticTypeName(),
TypedMetadata<T>::createMetadata);
}
template <typename T>
inline void
TypedMetadata<T>::unregisterType()
{
Metadata::unregisterType(TypedMetadata<T>::staticTypeName());
}
template <typename T>
inline bool
TypedMetadata<T>::isRegisteredType()
{
return Metadata::isRegisteredType(TypedMetadata<T>::staticTypeName());
}
template<>
inline std::string
TypedMetadata<bool>::str() const
{
return (mValue ? "true" : "false");
}
inline std::ostream&
operator<<(std::ostream& ostr, const Metadata& metadata)
{
ostr << metadata.str();
return ostr;
}
using BoolMetadata = TypedMetadata<bool>;
using DoubleMetadata = TypedMetadata<double>;
using FloatMetadata = TypedMetadata<float>;
using Int32Metadata = TypedMetadata<int32_t>;
using Int64Metadata = TypedMetadata<int64_t>;
using StringMetadata = TypedMetadata<std::string>;
using Vec2DMetadata = TypedMetadata<Vec2d>;
using Vec2IMetadata = TypedMetadata<Vec2i>;
using Vec2SMetadata = TypedMetadata<Vec2s>;
using Vec3DMetadata = TypedMetadata<Vec3d>;
using Vec3IMetadata = TypedMetadata<Vec3i>;
using Vec3SMetadata = TypedMetadata<Vec3s>;
using Vec4DMetadata = TypedMetadata<Vec4d>;
using Vec4IMetadata = TypedMetadata<Vec4i>;
using Vec4SMetadata = TypedMetadata<Vec4s>;
using Mat4SMetadata = TypedMetadata<Mat4s>;
using Mat4DMetadata = TypedMetadata<Mat4d>;
////////////////////////////////////////
template<>
inline Index32
StringMetadata::size() const
{
return static_cast<Index32>(mValue.size());
}
template<>
inline std::string
StringMetadata::str() const
{
return mValue;
}
template<>
inline void
StringMetadata::readValue(std::istream& is, Index32 size)
{
mValue.resize(size, '\0');
is.read(&mValue[0], size);
}
template<>
inline void
StringMetadata::writeValue(std::ostream& os) const
{
os.write(reinterpret_cast<const char*>(&mValue[0]), this->size());
}
} // namespace OPENVDB_VERSION_NAME
} // namespace openvdb
#endif // OPENVDB_METADATA_HAS_BEEN_INCLUDED
Exceptions.h
OPENVDB_THROW
#define OPENVDB_THROW(exception, message)
Definition Exceptions.h:74
operator<<
OPENVDB_API std::ostream & operator<<(std::ostream &os, half h)
Output h to os, formatted as a float.
Math.h
General-purpose arithmetic and comparison routines, most of which accept arbitrary value types (or at...
Name.h
OPENVDB_API
#define OPENVDB_API
Definition Platform.h:274
Types.h
openvdb::v11_0::Metadata
Base class for storing metadata information in a grid.
Definition Metadata.h:24
openvdb::v11_0::Metadata::ConstPtr
SharedPtr< const Metadata > ConstPtr
Definition Metadata.h:27
openvdb::v11_0::Metadata::copy
virtual void copy(const Metadata &other)=0
Copy the given metadata into this metadata.
openvdb::v11_0::Metadata::operator!=
bool operator!=(const Metadata &other) const
Return true if the given metadata is different from this metadata.
Definition Metadata.h:55
openvdb::v11_0::Metadata::asBool
virtual bool asBool() const =0
openvdb::v11_0::Metadata::typeName
virtual Name typeName() const =0
Return the type name of the metadata.
openvdb::v11_0::Metadata::Metadata
Metadata()
Definition Metadata.h:29
openvdb::v11_0::Metadata::operator=
Metadata & operator=(const Metadata &)=delete
openvdb::v11_0::Metadata::Metadata
Metadata(const Metadata &)=delete
openvdb::v11_0::Metadata::write
void write(std::ostream &) const
Serialize this metadata to a stream.
Definition Metadata.h:197
openvdb::v11_0::Metadata::createMetadata
static Metadata::Ptr createMetadata(const Name &typeName)
Create new metadata of the given type.
openvdb::v11_0::Metadata::writeValue
virtual void writeValue(std::ostream &) const =0
Write the metadata to a stream.
openvdb::v11_0::Metadata::str
virtual std::string str() const =0
Return a textual representation of this metadata.
openvdb::v11_0::Metadata::registerType
static void registerType(const Name &typeName, Metadata::Ptr(*createMetadata)())
Register the given metadata type along with a factory function.
openvdb::v11_0::Metadata::read
void read(std::istream &)
Unserialize this metadata from a stream.
Definition Metadata.h:189
openvdb::v11_0::Metadata::isRegisteredType
static bool isRegisteredType(const Name &typeName)
Return true if the given type is known by the metadata type registry.
openvdb::v11_0::Metadata::copy
virtual Metadata::Ptr copy() const =0
Return a copy of the metadata.
openvdb::v11_0::Metadata::unregisterType
static void unregisterType(const Name &typeName)
openvdb::v11_0::Metadata::readSize
static Index32 readSize(std::istream &)
Read the size of the metadata from a stream.
Definition Metadata.h:180
openvdb::v11_0::Metadata::operator==
bool operator==(const Metadata &other) const
Return true if the given metadata is equivalent to this metadata.
openvdb::v11_0::Metadata::Ptr
SharedPtr< Metadata > Ptr
Definition Metadata.h:26
openvdb::v11_0::Metadata::clearRegistry
static void clearRegistry()
Clear out the metadata registry.
openvdb::v11_0::Metadata::writeSize
void writeSize(std::ostream &) const
Write the size of the metadata to a stream.
Definition Metadata.h:172
openvdb::v11_0::Metadata::size
virtual Index32 size() const =0
Return the size of this metadata in bytes.
openvdb::v11_0::Metadata::readValue
virtual void readValue(std::istream &, Index32 numBytes)=0
Read the metadata from a stream.
openvdb::v11_0::Metadata::~Metadata
virtual ~Metadata()
Definition Metadata.h:30
openvdb::v11_0::TypeError
Definition Exceptions.h:64
openvdb::v11_0::TypedMetadata
Templated metadata class to hold specific types.
Definition Metadata.h:122
openvdb::v11_0::TypedMetadata::TypedMetadata
TypedMetadata(const T &value)
Definition Metadata.h:215
openvdb::v11_0::TypedMetadata::copy
void copy(const Metadata &other) override
Copy the given metadata into this metadata.
Definition Metadata.h:272
openvdb::v11_0::TypedMetadata::size
Index32 size() const override
Return the size of this metadata in bytes.
Definition Metadata.h:137
openvdb::v11_0::TypedMetadata::str
std::string str() const override
Return a textual representation of this metadata.
Definition Metadata.h:297
openvdb::v11_0::TypedMetadata::asBool
bool asBool() const override
Definition Metadata.h:306
openvdb::v11_0::TypedMetadata::typeName
Name typeName() const override
Return the type name of the metadata.
Definition Metadata.h:235
openvdb::v11_0::TypedMetadata::registerType
static void registerType()
Definition Metadata.h:321
openvdb::v11_0::TypedMetadata::unregisterType
static void unregisterType()
Definition Metadata.h:329
openvdb::v11_0::TypedMetadata::TypedMetadata
TypedMetadata(const TypedMetadata< T > &other)
Definition Metadata.h:221
openvdb::v11_0::TypedMetadata::isRegisteredType
static bool isRegisteredType()
Definition Metadata.h:336
openvdb::v11_0::TypedMetadata::createMetadata
static Metadata::Ptr createMetadata()
Create new metadata of this type.
Definition Metadata.h:313
openvdb::v11_0::TypedMetadata::TypedMetadata
TypedMetadata()
Definition Metadata.h:209
openvdb::v11_0::TypedMetadata::~TypedMetadata
~TypedMetadata() override
Definition Metadata.h:229
openvdb::v11_0::TypedMetadata::writeValue
void writeValue(std::ostream &) const override
Write the metadata to a stream.
Definition Metadata.h:290
openvdb::v11_0::TypedMetadata::Ptr
SharedPtr< TypedMetadata< T > > Ptr
Definition Metadata.h:124
openvdb::v11_0::TypedMetadata::copy
Metadata::Ptr copy() const override
Return a copy of the metadata.
Definition Metadata.h:263
openvdb::v11_0::TypedMetadata::ConstPtr
SharedPtr< const TypedMetadata< T > > ConstPtr
Definition Metadata.h:125
openvdb::v11_0::TypedMetadata< bool >::value
bool & value()
openvdb::v11_0::TypedMetadata::value
const T & value() const
Definition Metadata.h:256
openvdb::v11_0::TypedMetadata::staticTypeName
static Name staticTypeName()
Definition Metadata.h:147
openvdb::v11_0::TypedMetadata::readValue
void readValue(std::istream &, Index32 numBytes) override
Read the metadata from a stream.
Definition Metadata.h:282
openvdb::v11_0::TypedMetadata::setValue
void setValue(const T &)
Set this metadata's value.
Definition Metadata.h:242
openvdb::v11_0::UnknownMetadata::setValue
void setValue(const ByteVec &bytes)
Definition Metadata.h:106
openvdb::v11_0::UnknownMetadata::size
Index32 size() const override
Return the size of this metadata in bytes.
Definition Metadata.h:104
openvdb::v11_0::UnknownMetadata::copy
void copy(const Metadata &) override
Copy the given metadata into this metadata.
openvdb::v11_0::UnknownMetadata::value
const ByteVec & value() const
Definition Metadata.h:107
openvdb::v11_0::UnknownMetadata::str
std::string str() const override
Return a textual representation of this metadata.
Definition Metadata.h:102
openvdb::v11_0::UnknownMetadata::asBool
bool asBool() const override
Definition Metadata.h:103
openvdb::v11_0::UnknownMetadata::typeName
Name typeName() const override
Return the type name of the metadata.
Definition Metadata.h:99
openvdb::v11_0::UnknownMetadata::ByteVec
std::vector< uint8_t > ByteVec
Definition Metadata.h:95
openvdb::v11_0::UnknownMetadata::writeValue
void writeValue(std::ostream &) const override
Write the metadata to a stream.
openvdb::v11_0::UnknownMetadata::copy
Metadata::Ptr copy() const override
Return a copy of the metadata.
openvdb::v11_0::UnknownMetadata::UnknownMetadata
UnknownMetadata(const Name &typ="<unknown>")
Definition Metadata.h:97
openvdb::v11_0::UnknownMetadata::readValue
void readValue(std::istream &, Index32 numBytes) override
Read the metadata from a stream.
openvdb::v11_0::math::isZero
bool isZero(const Type &x)
Return true if x is exactly equal to zero.
Definition Math.h:337
openvdb::v11_0::Name
std::string Name
Definition Name.h:19
openvdb::v11_0::Vec4DMetadata
TypedMetadata< Vec4d > Vec4DMetadata
Definition Metadata.h:370
openvdb::v11_0::FloatMetadata
TypedMetadata< float > FloatMetadata
Definition Metadata.h:360
openvdb::v11_0::Vec2DMetadata
TypedMetadata< Vec2d > Vec2DMetadata
Definition Metadata.h:364
openvdb::v11_0::Vec3DMetadata
TypedMetadata< Vec3d > Vec3DMetadata
Definition Metadata.h:367
openvdb::v11_0::Int32Metadata
TypedMetadata< int32_t > Int32Metadata
Definition Metadata.h:361
openvdb::v11_0::Mat4DMetadata
TypedMetadata< Mat4d > Mat4DMetadata
Definition Metadata.h:374
openvdb::v11_0::operator<<
std::ostream & operator<<(std::ostream &ostr, const Metadata &metadata)
Write a Metadata to an output stream.
Definition Metadata.h:351
openvdb::v11_0::Vec2IMetadata
TypedMetadata< Vec2i > Vec2IMetadata
Definition Metadata.h:365
openvdb::v11_0::Index32
uint32_t Index32
Definition Types.h:52
openvdb::v11_0::StringMetadata
TypedMetadata< std::string > StringMetadata
Definition Metadata.h:363
openvdb::v11_0::Vec4SMetadata
TypedMetadata< Vec4s > Vec4SMetadata
Definition Metadata.h:372
openvdb::v11_0::Vec3SMetadata
TypedMetadata< Vec3s > Vec3SMetadata
Definition Metadata.h:369
openvdb::v11_0::SharedPtr
std::shared_ptr< T > SharedPtr
Definition Types.h:114
openvdb::v11_0::Vec2SMetadata
TypedMetadata< Vec2s > Vec2SMetadata
Definition Metadata.h:366
openvdb::v11_0::Vec4IMetadata
TypedMetadata< Vec4i > Vec4IMetadata
Definition Metadata.h:371
openvdb::v11_0::Mat4SMetadata
TypedMetadata< Mat4s > Mat4SMetadata
Definition Metadata.h:373
openvdb::v11_0::Vec3IMetadata
TypedMetadata< Vec3i > Vec3IMetadata
Definition Metadata.h:368
openvdb::v11_0::BoolMetadata
TypedMetadata< bool > BoolMetadata
Definition Metadata.h:358
openvdb::v11_0::Int64Metadata
TypedMetadata< int64_t > Int64Metadata
Definition Metadata.h:362
openvdb::v11_0::DoubleMetadata
TypedMetadata< double > DoubleMetadata
Definition Metadata.h:359
openvdb::v11_0::typeNameAsString
const char * typeNameAsString()
Definition Types.h:516
openvdb
Definition Exceptions.h:13
OPENVDB_VERSION_NAME
#define OPENVDB_VERSION_NAME
The version namespace name for this library version.
Definition version.h.in:121
OPENVDB_USE_VERSION_NAMESPACE
#define OPENVDB_USE_VERSION_NAMESPACE
Definition version.h.in:212