#include <enquire.h>
Inheritance diagram for Xapian::Weight:
Public Methods | |
Weight () | |
virtual | ~Weight () |
Weight * | create (const Internal *internal_, Xapian::doclength querysize_, Xapian::termcount wqf_, std::string tname_) const |
Create a new weight object of the same type as this and initialise it with the specified statistics. More... | |
virtual std::string | name () const=0 |
Name of the weighting scheme. More... | |
virtual std::string | serialise () const=0 |
Serialise object parameters into a string. More... | |
virtual Weight * | Weight::unserialise (const std::string &s) const=0 |
Create object given string serialisation returned by serialise(). More... | |
virtual Xapian::weight | get_sumpart (Xapian::termcount wdf, Xapian::doclength len) const=0 |
Get a weight which is part of the sum over terms being performed. More... | |
virtual Xapian::weight | get_maxpart () const=0 |
Gets the maximum value that get_sumpart() may return. More... | |
virtual Xapian::weight | get_sumextra (Xapian::doclength len) const=0 |
Get an extra weight for a document to add to the sum calculated over the query terms. More... | |
virtual Xapian::weight | get_maxextra () const=0 |
Gets the maximum value that get_sumextra() may return. More... | |
virtual bool | get_sumpart_needs_doclength () const |
return false if the weight object doesn't need doclength. More... | |
Protected Attributes | |
const Internal * | internal |
Xapian::doclength | querysize |
Xapian::termcount | wqf |
std::string | tname |
Friends | |
class | Enquire |
class | SocketServer |
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Create a new weight object of the same type as this and initialise it with the specified statistics. You shouldn't call this method yourself - it's called by Enquire.
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Gets the maximum value that get_sumextra() may return. This is used in optimising searches. Implemented in Xapian::BoolWeight, Xapian::BM25Weight, and Xapian::TradWeight. |
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Gets the maximum value that get_sumpart() may return. This is used in optimising searches, by having the postlist tree decay appropriately when parts of it can have limited, or no, further effect. Implemented in Xapian::BoolWeight, Xapian::BM25Weight, and Xapian::TradWeight. |
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Get an extra weight for a document to add to the sum calculated over the query terms. This returns a weight for a given document, and is used by some weighting schemes to account for influence such as document length.
Implemented in Xapian::BoolWeight, Xapian::BM25Weight, and Xapian::TradWeight. |
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Get a weight which is part of the sum over terms being performed. This returns a weight for a given term and document. These weights are summed to give a total weight for the document.
Implemented in Xapian::BoolWeight, Xapian::BM25Weight, and Xapian::TradWeight. |
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return false if the weight object doesn't need doclength.
Reimplemented in Xapian::BoolWeight, Xapian::BM25Weight, and Xapian::TradWeight. |
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Name of the weighting scheme. If the subclass is called FooWeight, this should return "Foo". Implemented in Xapian::BoolWeight, Xapian::BM25Weight, and Xapian::TradWeight. |
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Serialise object parameters into a string.
Implemented in Xapian::BoolWeight, Xapian::BM25Weight, and Xapian::TradWeight. |
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Create object given string serialisation returned by serialise().
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