libzypp: zypp::parser::XMLNodeIteratorBase Class Reference

List of all members.


Public Member Functions
	XMLNodeIteratorBase (std::istream &input, const std::string &baseUrl, const char *validationPath, parser::ParserProgress::Ptr progress)
	Constructor.
	XMLNodeIteratorBase (const Pathname xml_file_path, const std::string &baseUrl, const char *validationPath, parser::ParserProgress::Ptr progress)
	Constructor.
	XMLNodeIteratorBase ()
	Constructor for an empty iterator.
virtual	~XMLNodeIteratorBase ()
	Destructor.
bool	atEnd () const
	Have we reached the end? A parser error also means "end reached".
bool	operator== (const XMLNodeIteratorBase &other) const
	Two iterators are equal if both are at the end or if they are identical.
bool	operator!= (const XMLNodeIteratorBase &otherNode) const
	Opposit of operator==.
const XMLParserError *	errorStatus () const
	returns the error status or 0 if no error the returned pointer is not-owning, it will be deleted upon destruction of the XMLNodeIterator.
Protected Member Functions
virtual bool	isInterested (const xmlNodePtr nodePtr)=0
	filter for the xml nodes The derived class decides which xml nodes it is actually interested in.
virtual void	_process (const xmlTextReaderPtr readerPtr)=0
	process an xml node and set it as next element The derived class has to produce the ENTRYTYPE object here.
void	fetchNext ()
	Fetch the next element and save it as next element.
virtual void	setCurrent (const void *data)=0
virtual void *	getCurrent () const =0
Static Protected Member Functions
static void	errorHandler (void arg, const char msg, int severity, xmlTextReaderLocatorPtr locator)
	Internal function to set the _error variable in case of a parser error.
Private Member Functions
XMLNodeIteratorBase &	operator= (const XMLNodeIteratorBase &otherNode)
	assignment is forbidden.
	XMLNodeIteratorBase (const XMLNodeIteratorBase &otherNode)
	copy constructor is forbidden.
Private Attributes
std::auto_ptr < XMLParserError >	_error
	if an error occured, this contains the error.
std::istream *	_input
	contains the istream to read the xml file from.
FILE *	_file
	contains the file to read the xml file from.
xmlTextReaderPtr	_reader
	contains the xmlTextReader used to parse the xml file.
std::string	_baseUrl
	contains the base URL of the xml documentation
parser::ParserProgress::Ptr	_progress
	last progress information
long int	_stream_size
	size of the stream to parse
long int	_bytes_consumed
	bytes consumed in last report

Detailed Description

The derived iterator class should be compatible with an stl input iterator. Use like this:

for (Iterator iter(anIstream, baseUrl), iter != Iterator.end(), // or: iter() != 0, or ! iter.atEnd() ++iter) { doSomething(*iter) }

The iterator owns the pointer (i.e., caller must not delete it) until the next ++ operator is called. At this time, it will be destroyed (and a new ENTRYTYPE is created.)

If the input is fundamentally flawed so that it makes no sense to continue parsing, XMLNodeIterator will log it and consider the input as finished. You can query the exit status with errorStatus().

Constructor & Destructor Documentation

zypp::parser::XMLNodeIteratorBase::XMLNodeIteratorBase	(	std::istream &	input,
		const std::string &	baseUrl,
		const char *	validationPath,
		parser::ParserProgress::Ptr	progress
	)

Constructor.

Derived classes must call fetchNext() here.

Parameters:

	input	is the input stream (contains the xml stuff)
	baseUrl	is the base URL of the xml document FIXME: use XMLParserError::operator<< instead of doing it on my own.

Definition at line 156 of file XMLNodeIterator.cc.

References _reader, errorHandler(), and WAR.

zypp::parser::XMLNodeIteratorBase::XMLNodeIteratorBase	(	const Pathname	xml_file_path,
		const std::string &	baseUrl,
		const char *	validationPath,
		parser::ParserProgress::Ptr	progress
	)

Constructor.

Derived classes must call fetchNext() here.

Parameters:

	xml_file_path	is the xml file
	baseUrl	is the base URL of the xml document FIXME: use XMLParserError::operator<< instead of doing it on my own.

Definition at line 129 of file XMLNodeIterator.cc.

References _reader, errorHandler(), WAR, and ZYPP_THROW.

zypp::parser::XMLNodeIteratorBase::XMLNodeIteratorBase ( )

Constructor for an empty iterator.

An empty iterator is already at its end. This is what end() returns ...

Definition at line 181 of file XMLNodeIterator.cc.

zypp::parser::XMLNodeIteratorBase::~XMLNodeIteratorBase ( ) [virtual]

Destructor.

Definition at line 187 of file XMLNodeIterator.cc.

References _reader.

zypp::parser::XMLNodeIteratorBase::XMLNodeIteratorBase ( const XMLNodeIteratorBase & otherNode ) [private]

copy constructor is forbidden.

Reason: We can't copy an xmlTextReader FIXME: This prevents implementing the end() method for derived classes.

Parameters:

otherNode

Returns:

Member Function Documentation

bool zypp::parser::XMLNodeIteratorBase::atEnd ( ) const

Have we reached the end? A parser error also means "end reached".

Returns:: whether the end has been reached.

Definition at line 195 of file XMLNodeIterator.cc.

References _error, _progress, and getCurrent().

Referenced by zypp::parser::XMLNodeIterator< shared_ptr >::operator *(), zypp::parser::XMLNodeIterator< shared_ptr >::operator++(), zypp::parser::XMLNodeIterator< shared_ptr >::operator->(), operator==(), and zypp::storage::XMLFilesBackend::resolvablesFromFile().

bool zypp::parser::XMLNodeIteratorBase::operator== ( const XMLNodeIteratorBase & other ) const

Two iterators are equal if both are at the end or if they are identical.

Since you cannot copy an XMLNodeIterator, everything else is not equal.

Parameters:

other

the other iterator

Returns:: true if equal

Definition at line 208 of file XMLNodeIterator.cc.

References atEnd().

Referenced by operator!=().

bool zypp::parser::XMLNodeIteratorBase::operator!= ( const XMLNodeIteratorBase & otherNode ) const [inline]

Opposit of operator==.

Parameters:

other

the other iterator

Returns:: true if not equal

Definition at line 194 of file XMLNodeIterator.h.

References operator==().

const XMLParserError * zypp::parser::XMLNodeIteratorBase::errorStatus ( ) const

returns the error status or 0 if no error the returned pointer is not-owning, it will be deleted upon destruction of the XMLNodeIterator.

Returns:: pointer to error status (if exists)

Definition at line 218 of file XMLNodeIterator.cc.

References _error.

virtual bool zypp::parser::XMLNodeIteratorBase::isInterested ( const xmlNodePtr nodePtr ) [protected, pure virtual]

filter for the xml nodes The derived class decides which xml nodes it is actually interested in.

For each that is selected, process() will be called an the resulting ENTRYTYPE object used as the next value for the iterator. Documentation for the node structure can be found in the libxml2 documentation. Have a look at LibXMLHelper to access node attributes and contents.

Parameters:

nodePtr

points to the xml node in question. Only the node is available, not the subtree. See libxml2 documentation.

Returns:: true if interested

Implemented in zypp::parser::XMLNodeIterator< ENTRYTYPE >, zypp::parser::xmlstore::XMLLanguageParser, zypp::parser::xmlstore::XMLPatchParser, zypp::parser::xmlstore::XMLPatternParser, zypp::parser::xmlstore::XMLProductParser, zypp::parser::xmlstore::XMLSourceCacheParser, zypp::parser::XMLNodeIterator< XMLProductData_Ptr >, zypp::parser::XMLNodeIterator< XMLPatternData_Ptr >, zypp::parser::XMLNodeIterator< XMLLanguageData_Ptr >, zypp::parser::XMLNodeIterator< XMLPatchData_Ptr >, and zypp::parser::XMLNodeIterator< shared_ptr >.

Referenced by fetchNext().

virtual void zypp::parser::XMLNodeIteratorBase::_process ( const xmlTextReaderPtr readerPtr ) [protected, pure virtual]

process an xml node and set it as next element The derived class has to produce the ENTRYTYPE object here.

Details about the xml reader is in the libxml2 documentation. You'll most probably want to use xmlTextReaderExpand(reader) to request the full subtree, and then use the links in the resulting node structure to traverse, and class LibXMLHelper to access the attributes and element contents. fetchNext() cannot throw an error since it will be called in the constructor. Instead, in case of a fundamental syntax error the error is saved and will be thrown with the next checkError().

Parameters:

readerPtr

points to the xmlTextReader that reads the xml stream.

Implemented in zypp::parser::XMLNodeIterator< ENTRYTYPE >, zypp::parser::XMLNodeIterator< XMLProductData_Ptr >, zypp::parser::XMLNodeIterator< XMLPatternData_Ptr >, zypp::parser::XMLNodeIterator< XMLLanguageData_Ptr >, zypp::parser::XMLNodeIterator< XMLPatchData_Ptr >, and zypp::parser::XMLNodeIterator< shared_ptr >.

Referenced by fetchNext().

void zypp::parser::XMLNodeIteratorBase::fetchNext ( ) [protected]

Fetch the next element and save it as next element.

Definition at line 224 of file XMLNodeIterator.cc.

References _bytes_consumed, _error, _process(), _progress, _reader, errorHandler(), isInterested(), setCurrent(), and xml_assert.

Referenced by zypp::parser::XMLNodeIterator< shared_ptr >::operator++(), zypp::parser::xmlstore::XMLLanguageParser::XMLLanguageParser(), zypp::parser::xmlstore::XMLPatchParser::XMLPatchParser(), zypp::parser::xmlstore::XMLPatternParser::XMLPatternParser(), zypp::parser::xmlstore::XMLProductParser::XMLProductParser(), and zypp::parser::xmlstore::XMLSourceCacheParser::XMLSourceCacheParser().

void zypp::parser::XMLNodeIteratorBase::errorHandler	(	void *	arg,
		const char *	msg,
		int	severity,
		xmlTextReaderLocatorPtr	locator
	)			`[static, protected]`