Public Member Functions | |
ValueCountMatchSpy () | |
Construct an empty ValueCountMatchSpy. | |
ValueCountMatchSpy (Xapian::valueno slot_) | |
Construct a MatchSpy which counts the values in a particular slot. | |
const std::map< std::string, Xapian::doccount > & | get_values () const |
Return the values seen in the slot. | |
size_t | get_total () const |
Return the total number of documents tallied. | |
void | get_top_values (std::vector< StringAndFrequency > &result, size_t maxvalues) const |
Get the most frequent values in the slot. | |
void | operator() (const Xapian::Document &doc, Xapian::weight wt) |
Implementation of virtual operator(). | |
virtual MatchSpy * | clone () const |
Clone the match spy. | |
virtual std::string | name () const |
Return the name of this match spy. | |
virtual std::string | serialise () const |
Return this object's parameters serialised as a single string. | |
virtual MatchSpy * | unserialise (const std::string &s, const Registry &context) const |
Unserialise parameters. | |
virtual std::string | serialise_results () const |
Serialise the results of this match spy. | |
virtual void | merge_results (const std::string &s) |
Unserialise some results, and merge them into this matchspy. | |
virtual std::string | get_description () const |
Return a string describing this object. | |
Protected Attributes | |
Xapian::valueno | slot |
The slot to count. | |
Xapian::doccount | total |
Total number of documents seen by the match spy. | |
std::map< std::string, Xapian::doccount > | values |
The values seen so far, together with their frequency. |
Warning: this API is currently experimental, and is liable to change between releases without warning.
Xapian::ValueCountMatchSpy::ValueCountMatchSpy | ( | Xapian::valueno | slot_ | ) | [inline] |
Construct a MatchSpy which counts the values in a particular slot.
Further slots can be added by calling add_slot().
virtual MatchSpy* Xapian::ValueCountMatchSpy::clone | ( | ) | const [virtual] |
Clone the match spy.
The clone should inherit the configuration of the parent, but need not inherit the state. ie, the clone does not need to be passed information about the results seen by the parent.
If you don't want to support the remote backend in your match spy, you can use the default implementation which simply throws Xapian::UnimplementedError.
Note that the returned object will be deallocated by Xapian after use with "delete". It must therefore have been allocated with "new".
Reimplemented from Xapian::MatchSpy.
virtual std::string Xapian::ValueCountMatchSpy::get_description | ( | ) | const [virtual] |
Return a string describing this object.
This default implementation returns a generic answer, to avoid forcing those deriving their own MatchSpy subclasses from having to implement this (they may not care what get_description() gives for their subclass).
Reimplemented from Xapian::MatchSpy.
void Xapian::ValueCountMatchSpy::get_top_values | ( | std::vector< StringAndFrequency > & | result, | |
size_t | maxvalues | |||
) | const |
Get the most frequent values in the slot.
result | A vector which will be filled with the most frequent values, in descending order of frequency. Values with the same frequency will be sorted in ascending alphabetical order. | |
maxvalues | The maximum number of values to return. |
size_t Xapian::ValueCountMatchSpy::get_total | ( | ) | const [inline] |
Return the total number of documents tallied.
virtual void Xapian::ValueCountMatchSpy::merge_results | ( | const std::string & | s | ) | [virtual] |
Unserialise some results, and merge them into this matchspy.
The order in which results are merged should not be significant, since this order is not specified (and will vary depending on the speed of the search in each sub-database).
If you don't want to support the remote backend in your match spy, you can use the default implementation which simply throws Xapian::UnimplementedError.
Reimplemented from Xapian::MatchSpy.
virtual std::string Xapian::ValueCountMatchSpy::name | ( | ) | const [virtual] |
Return the name of this match spy.
This name is used by the remote backend. It is passed with the serialised parameters to the remote server so that it knows which class to create.
Return the full namespace-qualified name of your class here - if your class is called MyApp::FooMatchSpy, return "MyApp::FooMatchSpy" from this method.
If you don't want to support the remote backend in your match spy, you can use the default implementation which simply throws Xapian::UnimplementedError.
Reimplemented from Xapian::MatchSpy.
void Xapian::ValueCountMatchSpy::operator() | ( | const Xapian::Document & | doc, | |
Xapian::weight | wt | |||
) | [virtual] |
Implementation of virtual operator().
This implementation tallies values for a matching document.
Implements Xapian::MatchSpy.
virtual std::string Xapian::ValueCountMatchSpy::serialise | ( | ) | const [virtual] |
Return this object's parameters serialised as a single string.
If you don't want to support the remote backend in your match spy, you can use the default implementation which simply throws Xapian::UnimplementedError.
Reimplemented from Xapian::MatchSpy.
virtual std::string Xapian::ValueCountMatchSpy::serialise_results | ( | ) | const [virtual] |
Serialise the results of this match spy.
If you don't want to support the remote backend in your match spy, you can use the default implementation which simply throws Xapian::UnimplementedError.
Reimplemented from Xapian::MatchSpy.
virtual MatchSpy* Xapian::ValueCountMatchSpy::unserialise | ( | const std::string & | s, | |
const Registry & | context | |||
) | const [virtual] |
Unserialise parameters.
This method unserialises parameters serialised by the serialise() method and allocates and returns a new object initialised with them.
If you don't want to support the remote backend in your match spy, you can use the default implementation which simply throws Xapian::UnimplementedError.
Note that the returned object will be deallocated by Xapian after use with "delete". It must therefore have been allocated with "new".
Reimplemented from Xapian::MatchSpy.