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// Copyright Yahoo. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
#include "assignfieldpathupdate.h"
#include <vespa/document/fieldvalue/fieldvalues.h>
#include <vespa/document/fieldvalue/iteratorhandler.h>
#include <vespa/document/select/variablemap.h>
#include <vespa/document/serialization/vespadocumentdeserializer.h>
#include <vespa/vespalib/objects/nbostream.h>
#include <vespa/vespalib/util/exceptions.h>
#include <boost/numeric/conversion/cast.hpp>
#include <ostream>
#include <vespa/log/log.h>
LOG_SETUP(".document.update.fieldpathupdate");
using vespalib::nbostream;
namespace document {
using namespace fieldvalue;
AssignFieldPathUpdate::AssignFieldPathUpdate()
: FieldPathUpdate(Assign),
_newValue(),
_expression(),
_removeIfZero(false),
_createMissingPath(false)
{ }
AssignFieldPathUpdate::AssignFieldPathUpdate(
const DataType& type,
stringref fieldPath,
stringref whereClause,
std::unique_ptr<FieldValue> newValue)
: FieldPathUpdate(Assign, fieldPath, whereClause),
_newValue(std::move(newValue)),
_expression(),
_removeIfZero(false),
_createMissingPath(true)
{
checkCompatibility(*_newValue, type);
}
AssignFieldPathUpdate::AssignFieldPathUpdate(stringref fieldPath, stringref whereClause, stringref expression)
: FieldPathUpdate(Assign, fieldPath, whereClause),
_newValue(),
_expression(expression),
_removeIfZero(false),
_createMissingPath(true)
{
if (_expression.empty()) {
throw vespalib::IllegalArgumentException("Cannot create an arithmetic "
"assignment update with an empty expression", VESPA_STRLOC);
}
}
AssignFieldPathUpdate::~AssignFieldPathUpdate() = default;
namespace {
class AssignValueIteratorHandler : public IteratorHandler
{
public:
AssignValueIteratorHandler(const FieldValue& newValue,
bool removeIfZero,
bool createMissingPath_)
: _newValue(newValue), _removeIfZero(removeIfZero),
_createMissingPath(createMissingPath_)
{}
ModificationStatus doModify(FieldValue& fv) override;
bool onComplex(const Content&) override { return false; }
bool createMissingPath() const override { return _createMissingPath; }
private:
const FieldValue& _newValue;
bool _removeIfZero;
bool _createMissingPath;
};
class AssignExpressionIteratorHandler : public IteratorHandler
{
public:
AssignExpressionIteratorHandler(
const DocumentTypeRepo& repo,
Document& doc,
const vespalib::string& expression,
bool removeIfZero,
bool createMissingPath_)
: _calc(repo, expression),
_doc(doc),
_removeIfZero(removeIfZero),
_createMissingPath(createMissingPath_)
{}
ModificationStatus doModify(FieldValue& fv) override;
bool onComplex(const Content&) override { return false; }
bool createMissingPath() const override { return _createMissingPath; }
private:
DocumentCalculator _calc;
Document& _doc;
bool _removeIfZero;
bool _createMissingPath;
};
ModificationStatus
AssignValueIteratorHandler::doModify(FieldValue& fv) {
LOG(spam, "fv = %s", fv.toString().c_str());
if (!(*fv.getDataType() == *_newValue.getDataType())) {
vespalib::string err = vespalib::make_string(
"Trying to assign \"%s\" of type %s to an instance of type %s",
_newValue.toString().c_str(), _newValue.className(), fv.className());
throw vespalib::IllegalArgumentException(err, VESPA_STRLOC);
}
if (_removeIfZero
&& _newValue.isNumeric()
&& static_cast<const NumericFieldValueBase&>(_newValue).getAsLong() == 0)
{
return ModificationStatus::REMOVED;
}
fv.assign(_newValue);
return ModificationStatus::MODIFIED;
}
ModificationStatus
AssignExpressionIteratorHandler::doModify(FieldValue& fv) {
LOG(spam, "fv = %s", fv.toString().c_str());
if (fv.isNumeric()) {
std::unique_ptr<select::VariableMap> varHolder = std::make_unique<select::VariableMap>();
select::VariableMap & vars = *varHolder;
for (VariableMap::const_iterator i(getVariables().begin()),
e(getVariables().end()); i != e; ++i)
{
if (i->second.key.get() && i->second.key->isNumeric()) {
vars[i->first] = i->second.key->getAsDouble();
} else {
vars[i->first] = i->second.index;
}
}
vars["value"] = fv.getAsDouble();
try {
double res = _calc.evaluate(_doc, std::move(varHolder));
if (_removeIfZero && static_cast<uint64_t>(res) == 0) {
return ModificationStatus::REMOVED;
} else {
fv.assign(DoubleFieldValue(res));
}
} catch (const vespalib::IllegalArgumentException&) {
// Divide by zero does not modify the document field
return ModificationStatus::NOT_MODIFIED;
} catch (const boost::bad_numeric_cast&) {
// Underflow/overflow does not modify
return ModificationStatus::NOT_MODIFIED;
}
} else {
throw vespalib::IllegalArgumentException(
vespalib::make_string("Trying to perform arithmetic on %s of type %s",
fv.toString().c_str(), fv.getDataType()->toString().c_str()),
VESPA_STRLOC);
}
return ModificationStatus::MODIFIED;
}
}
std::unique_ptr<IteratorHandler>
AssignFieldPathUpdate::getIteratorHandler(Document& doc, const DocumentTypeRepo & repo) const
{
if (!_expression.empty()) {
return std::make_unique<AssignExpressionIteratorHandler>(repo, doc, _expression, _removeIfZero, _createMissingPath);
} else {
return std::make_unique<AssignValueIteratorHandler>(*_newValue, _removeIfZero, _createMissingPath);
}
}
bool
AssignFieldPathUpdate::operator==(const FieldPathUpdate& other) const
{
if (!FieldPathUpdate::operator==(other)) return false;
const auto & assignOther = static_cast<const AssignFieldPathUpdate&>(other);
if (assignOther._newValue.get() && _newValue.get()) {
if (*assignOther._newValue != *_newValue) return false;
}
// else: should always have at least 1 with non-empty expression
return (assignOther._expression == _expression)
&& (assignOther._removeIfZero == _removeIfZero)
&& (assignOther._createMissingPath == _createMissingPath);
}
void
AssignFieldPathUpdate::print(std::ostream& out, bool verbose, const std::string& indent) const
{
out << "AssignFieldPathUpdate(\n";
FieldPathUpdate::print(out, verbose, indent + " ");
if (_newValue.get()) {
out << ",\n" << indent << " " << "newValue=";
_newValue->print(out, verbose, indent + " ");
} else {
out << ",\n" << indent << " " << "expression='" << _expression << "'";
}
out << ", removeIfZero=" << (_removeIfZero ? "yes" : "no")
<< ", createMissingPath=" << (_createMissingPath ? "yes" : "no")
<< "\n" << indent << ")";
}
void
AssignFieldPathUpdate::deserialize(const DocumentTypeRepo& repo, const DataType& type, nbostream & stream)
{
FieldPathUpdate::deserialize(repo, type, stream);
uint8_t flags = 0x00;
stream >> flags;
_removeIfZero = (flags & REMOVE_IF_ZERO) != 0;
_createMissingPath = (flags & CREATE_MISSING_PATH) != 0;
if (flags & ARITHMETIC_EXPRESSION) {
_expression = getString(stream);
} else {
FieldPath path;
type.buildFieldPath(path, getOriginalFieldPath());
_newValue.reset(getResultingDataType(path).createFieldValue().release());
VespaDocumentDeserializer deserializer(repo, stream, Document::getNewestSerializationVersion());
deserializer.read(*_newValue);
}
}
} // ns document
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