Convenience wrapper that adapts a stream-based reader implementation ReaderImpl into a file-based Base::DataReader by opening an std::ifstream and forwarding all read operations to the wrapped reader. More...

#include <FileDataReader.hpp>

Inheritance diagram for CDPL::Util::FileDataReader< ReaderImpl, DataType >:

Public Member Functions
	FileDataReader (const std::string &file_name, std::ios_base::openmode mode=std::ios_base::in\|std::ios_base::binary)
	Constructs a `FileDataReader` instance that opens the file file_name in the given mode and forwards all read operations to a freshly constructed ReaderImpl wrapping the file stream. More...

FileDataReader &	read (DataType &obj, bool overwrite=true)
	Reads the next record into obj via the wrapped reader. More...

FileDataReader &	read (std::size_t idx, DataType &obj, bool overwrite=true)
	Reads the record at index idx into obj via the wrapped reader. More...

FileDataReader &	skip ()
	Skips the next record via the wrapped reader. More...

bool	hasMoreData ()
	Tells whether the wrapped reader has more records to read. More...

std::size_t	getRecordIndex () const
	Returns the current record index of the wrapped reader. More...

void	setRecordIndex (std::size_t idx)
	Sets the current record index of the wrapped reader. More...

std::size_t	getNumRecords ()
	Returns the total number of records as reported by the wrapped reader. More...

	operator const void * () const
	Tells whether the reader is in a good (readable) state. More...

bool	operator! () const
	Tells whether the reader is in a bad (non-readable) state. More...

void	close ()
	Closes the wrapped reader and the underlying file stream. More...

Public Member Functions inherited from CDPL::Base::DataReader< typename ReaderImpl::DataType >
virtual DataReader &	read (DataType &obj, bool overwrite=true)=0
	Reads the data record at the current record index and stores the read data in obj. More...

virtual DataReader &	read (std::size_t idx, DataType &obj, bool overwrite=true)=0
	Reads the data record at index idx and stores the read data in obj. More...

Public Member Functions inherited from CDPL::Base::DataIOBase
std::size_t	registerIOCallback (const IOCallbackFunction &func)
	Registers an I/O callback target function. More...

void	unregisterIOCallback (std::size_t id)
	Unregisters the I/O callback function specified by id. More...

void	invokeIOCallbacks (double progress) const
	Invokes all registered I/O callback functions with the argument `*this`. More...

void	clearIOCallbacks ()
	Clears all registered I/O callback functions. More...

Public Member Functions inherited from CDPL::Base::ControlParameterContainer
std::size_t	getNumParameters () const
	Returns the number of container entries. More...

template<typename T >
void	setParameter (const LookupKey &key, T &&val)
	Sets the value of the control-parameter specified by key to val. More...

const Any &	getParameter (const LookupKey &key, bool throw_=false, bool local=false) const
	Returns the value of the control-parameter specified by key. More...

template<typename T >
const T &	getParameter (const LookupKey &key, bool local=false) const
	Returns the value of the control-parameter specified by key as a `const` reference to an object of type T. More...

template<typename T >
const T &	getParameterOrDefault (const LookupKey &key, const T &def_val, bool local=false) const
	Returns the value of the control-parameter specified by key as a `const` reference to an object of type T, or the default value def_val if a stored value does not exist. More...

bool	removeParameter (const LookupKey &key)
	Removes the entry for the control-parameter specified by key. More...

void	clearParameters ()
	Erases all container entries. More...

bool	isParameterSet (const LookupKey &key, bool local=false) const
	Tells whether or not a value has been assigned to the control-parameter specified by key. More...

void	addParameters (const ControlParameterContainer &cntnr)
	Adds the control-parameter value entries in the `ControlParameterContainer` instance cntnr. More...

void	copyParameters (const ControlParameterContainer &cntnr)
	Replaces the current set of properties by a copy of the entries in cntnr. More...

ConstParameterIterator	getParametersBegin () const
	Returns a constant iterator pointing to the beginning of the entries. More...

ConstParameterIterator	getParametersEnd () const
	Returns a constant iterator pointing to the end of the entries. More...

ConstParameterIterator	begin () const
	Returns a constant iterator pointing to the beginning of the entries. More...

ConstParameterIterator	end () const
	Returns a constant iterator pointing to the end of the entries. More...

void	setParent (const ControlParameterContainer *cntnr)
	Sets or removes the parent control-parameter container used to resolve requests for missing entries. More...

const ControlParameterContainer *	getParent () const
	Returns a pointer to the parent control-parameter container. More...

std::size_t	registerParameterChangedCallback (const ParameterChangedCallbackFunction &func)
	Registers a callback target function that gets invoked when the value of a control-parameter has changed. More...

void	unregisterParameterChangedCallback (std::size_t id)
	Unregisters the callback specified by id. More...

std::size_t	registerParameterRemovedCallback (const ParameterRemovedCallbackFunction &func)
	Registers a callback target function that gets invoked when a control-parameter entry has been removed. More...

void	unregisterParameterRemovedCallback (std::size_t id)
	Unregisters the callback specified by id. More...

std::size_t	registerParentChangedCallback (const ParentChangedCallbackFunction &func)
	Registers a callback target function that gets invoked when the parent container has been changed or was detached. More...

void	unregisterParentChangedCallback (std::size_t id)
	Unregisters the callback specified by id. More...

const ControlParameterContainer &	getParameters () const
	Returns a `const` reference to itself. More...

Additional Inherited Members
Public Types inherited from CDPL::Base::DataReader< typename ReaderImpl::DataType >
typedef typename ReaderImpl::DataType	DataType
	The type of the read data objects. More...

typedef std::shared_ptr< DataReader >	SharedPointer
	A reference-counted smart pointer [SHPTR] for dynamically allocated `DataReader` instances. More...

Public Types inherited from CDPL::Base::DataIOBase
typedef std::function< void(const DataIOBase &, double)>	IOCallbackFunction
	A functor class used to wrap I/O callback target functions. More...

Public Types inherited from CDPL::Base::ControlParameterContainer
typedef ParameterMap::value_type	ParameterEntry
	A Base::LookupKey / Base::Any pair used to store the control-parameter values and associated keys. More...

typedef ParameterMap::const_iterator	ConstParameterIterator
	A constant iterator used to iterate over the control-parameter entries. More...

typedef std::function< void(const LookupKey &, const Any &)>	ParameterChangedCallbackFunction
	A functor class that wraps callback target functions which get invoked when the value of a control-parameter has changed. More...

typedef std::function< void(const LookupKey &)>	ParameterRemovedCallbackFunction
	A functor class that wraps callback target functions which get invoked when a control-parameter entry has been removed. More...

typedef std::function< void()>	ParentChangedCallbackFunction
	A functor class that wraps callback target functions which get invoked when the parent container has been changed or was detached. More...

Protected Member Functions inherited from CDPL::Base::DataReader< typename ReaderImpl::DataType >
DataReader &	operator= (const DataReader &reader)
	Assignment operator. More...

Protected Member Functions inherited from CDPL::Base::DataIOBase
	DataIOBase ()
	Default constructor. More...

	DataIOBase (const DataIOBase &io_base)
	Copy constructor. More...

	~DataIOBase ()
	Destructor. More...

DataIOBase &	operator= (const DataIOBase &io_base)
	Assignment operator. More...

Protected Member Functions inherited from CDPL::Base::ControlParameterContainer
	ControlParameterContainer ()
	Constructs an empty `ControlParameterContainer` instance. More...

	ControlParameterContainer (const ControlParameterContainer &cntnr)
	Constructs a copy of the `ControlParameterContainer` instance cntnr. More...

virtual	~ControlParameterContainer ()
	Destructor. More...

ControlParameterContainer &	operator= (const ControlParameterContainer &cntnr)
	Assignment operator. More...

Detailed Description

template<typename ReaderImpl, typename DataType = typename ReaderImpl::DataType>
class CDPL::Util::FileDataReader< ReaderImpl, DataType >

Convenience wrapper that adapts a stream-based reader implementation ReaderImpl into a file-based Base::DataReader by opening an std::ifstream and forwarding all read operations to the wrapped reader.

Template Parameters

ReaderImpl	The underlying stream-based reader implementation type.
DataType	The data type read by ReaderImpl.

Constructor & Destructor Documentation

◆ FileDataReader()

template<typename ReaderImpl , typename DataType >

CDPL::Util::FileDataReader< ReaderImpl, DataType >::FileDataReader	(	const std::string &	file_name,
		std::ios_base::openmode	mode = `std::ios_base::in \| std::ios_base::binary`
	)

Constructs a FileDataReader instance that opens the file file_name in the given mode and forwards all read operations to a freshly constructed ReaderImpl wrapping the file stream.

Parameters

file_name	The path of the input file to open.
mode	The open mode of the underlying `std::ifstream`.

Exceptions

Base::IOError if the file could not be opened.

Member Function Documentation

◆ read() [1/2]

template<typename ReaderImpl , typename DataType >

CDPL::Util::FileDataReader< ReaderImpl, DataType > & CDPL::Util::FileDataReader< ReaderImpl, DataType >::read	(	DataType &	obj,
		bool	overwrite = `true`
	)

Reads the next record into obj via the wrapped reader.

Parameters

obj	The output object.
overwrite	If `true`, the output object is cleared before the record is copied into it.

Returns: A reference to itself.

Exceptions

Base::IOError on read failure.

◆ read() [2/2]

template<typename ReaderImpl , typename DataType >

CDPL::Util::FileDataReader< ReaderImpl, DataType > & CDPL::Util::FileDataReader< ReaderImpl, DataType >::read	(	std::size_t	idx,
		DataType &	obj,
		bool	overwrite = `true`
	)