Defining the XSLT Transformation Input Stream
This code can be found in buildspace\ examples\xmlstreams\xsltTransform\-XsltObjectInputStreamImp.h.
class RWXsltObjectInputStreamImp : public RWXmlObjectInputStreamImp
{
protected:
RWXsltObjectInputStreamImp(std::istream& istr,
RWTXsltTransform<char> transformer,
bool escape) // 1
:
RWXmlObjectInputStreamImp(RWIstreamDataFromCharInputStreamImp::make(
RWXsltCharInputStreamImp::make(
RWCharFromStreambufInputStreamImp::make(
*(istr.rdbuf())),transformer)),escape) // 2
{;}
public:
static RWObjectInputStream make(std::istream& source,
std::istream& script, bool escape = true) // 3
{
return RWObjectInputStream(new
RWXsltObjectInputStreamImp(source,
RWTXsltTransform<char>(script,escape));
}
};
//1 The constructor for the transformation stream takes an input stream for the XML document to transform, a transformation object, and a flag to indicate whether or not the output should be escaped.
//2 Here you initialize the base class using the char transformation stream defined by the typedef above. Note that you
first create a character input stream, then use that to create the Xalan transformation char input stream, then use the Xalan char stream to create an Istream input stream, and finally use that stream to create the base RWXmlObjectInputStreamImp. This is an example of chaining together streaming elements to create a new stream with specific functionality (in this case the ability to transform an XML document using XSLT).//3 The static make() function produces an object stream handle by creating a Xalan transformation stream. Here you construct a transformation object and pass it to the constructor for the Xalan transformation stream.
