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#ifndef INPUTXSLT_SRC_FUNCTION_BASE_H_
#define INPUTXSLT_SRC_FUNCTION_BASE_H_
#include <xalanc/XPath/XObjectFactory.hpp>
#include <xalanc/XPath/Function.hpp>
#include <xalanc/XPath/XObject.hpp>
#include <boost/optional.hpp>
#include <memory>
#include <tuple>
#include <utility>
#include "common.h"
#include "support/xalan_string.h"
#include "support/filesystem_context.h"
#include "support/include_entity_resolver.h"
#include "support/dom/document_cache.h"
#include "support/type/filter.h"
#include "support/type/xobject_value.h"
namespace InputXSLT {
template <
typename Implementation,
typename... Types
>
class FunctionBase : public xalan::Function {
static const std::size_t maximum_parameter_count = sizeof...(Types);
static const std::size_t minimum_parameter_count = maximum_parameter_count
- std::tuple_size<
typename filter_derived<
boost::optional_detail::optional_tag,
Types...
>::type
>::value;
public:
FunctionBase(IncludeEntityResolver* resolver):
include_resolver_(resolver),
document_cache_(std::make_shared<DomDocumentCache>()) { }
virtual xalan::XObjectPtr execute(
xalan::XPathExecutionContext& executionContext,
xalan::XalanNode* context,
const XObjectArgVectorType& parameters,
const xalan::Locator* locator
) const {
this->validateParameters(
parameters,
executionContext,
context,
locator
);
xalan::XalanDocument* const domDocument(
this->callConstructDocument(
parameters,
std::make_integer_sequence<std::size_t, maximum_parameter_count>()
)
);
xalan::XPathExecutionContext::BorrowReturnMutableNodeRefList nodes(
executionContext
);
nodes->addNodes(
*domDocument->getDocumentElement()->getChildNodes()
);
return executionContext.getXObjectFactory().createNodeSet(nodes);
}
virtual FunctionBase* clone(
xalan::MemoryManager& manager) const {
return xalan::XalanCopyConstruct(
manager,
static_cast<const Implementation&>(*this)
);
}
FunctionBase& operator=(const FunctionBase&) = delete;
bool operator==(const FunctionBase&) const = delete;
protected:
IncludeEntityResolver* const include_resolver_;
private:
std::shared_ptr<DomDocumentCache> document_cache_;
const xalan::XalanDOMString& getError(
xalan::XalanDOMString& result) const {
const std::string startText("The function expects ");
const std::string endText(" parameter(s)");
if ( minimum_parameter_count == maximum_parameter_count ) {
result.assign(std::string(
startText
+ std::to_string(minimum_parameter_count)
+ endText
).data());
} else {
result.assign(std::string(
startText
+ "between "
+ std::to_string(minimum_parameter_count)
+ " and "
+ std::to_string(maximum_parameter_count)
+ endText
).data());
}
return result;
}
template <std::size_t... Index>
xalan::XalanDocument* callConstructDocument(
const XObjectArgVectorType& parameters,
std::integer_sequence<std::size_t, Index...>
) const {
const FilesystemContext context;
XObjectValue valueGetter(&context, this->include_resolver_);
return this->document_cache_->create(
static_cast<const Implementation*>(this)->constructDocument(
context,
valueGetter.get<typename std::tuple_element<
Index,
std::tuple<Types...>
>::type>(
Index < parameters.size()
? parameters[Index]
: xalan::XObjectPtr()
)...
)
);
}
void validateParameters(
const XObjectArgVectorType& parameters,
xalan::XPathExecutionContext& executionContext,
xalan::XalanNode* context,
const xalan::Locator* locator
) const {
const bool anyNull = std::any_of(
parameters.begin(),
parameters.end(),
[](const xalan::XObjectPtr& ptr) -> bool {
return ptr.null();
}
);
if ( parameters.size() > maximum_parameter_count ||
parameters.size() < minimum_parameter_count ||
anyNull ) {
xalan::XPathExecutionContext::GetAndReleaseCachedString guard(
executionContext
);
this->generalError(executionContext, context, locator);
}
}
};
}
#endif // INPUTXSLT_SRC_FUNCTION_BASE_H_