MSetPostList Class Reference

PostList returning entries from an MSet. More...

#include <msetpostlist.h>

Inheritance diagram for MSetPostList:

[legend]Collaboration diagram for MSetPostList:


Public Member Functions
	MSetPostList (const Xapian::MSet mset, bool decreasing_relevance_)
Xapian::doccount	get_termfreq_min () const
	Get a lower bound on the number of documents indexed by this term.
Xapian::doccount	get_termfreq_est () const
	Get an estimate of the number of documents indexed by this term.
Xapian::doccount	get_termfreq_max () const
	Get an upper bound on the number of documents indexed by this term.
Xapian::weight	get_maxweight () const
	Return an upper bound on what get_weight() can return.
Xapian::docid	get_docid () const
	Return the current docid.
Xapian::weight	get_weight () const
	Return the weight contribution for the current position.
const string *	get_collapse_key () const
	If the collapse key is already known, return it.
Xapian::doclength	get_doclength () const
	Not implemented for MSetPostList.
Xapian::weight	recalc_maxweight ()
	Recalculate the upper bound on what get_weight() can return.
PostList *	next (Xapian::weight w_min)
	Advance the current position to the next document in the postlist.
PostList *	skip_to (Xapian::docid did, Xapian::weight w_min)
	Not meaningful for MSetPostList.
bool	at_end () const
	Return true if the current position is past the last entry in this list.
string	get_description () const
	Return a string description of this object.
Private Member Functions
void	operator= (const MSetPostList &)
	Don't allow assignment.
	MSetPostList (const MSetPostList &)
	Don't allow copying.
Private Attributes
int	cursor
	The MSet element that this PostList is pointing to.
Xapian::Internal::RefCntPtr< Xapian::MSet::Internal >	mset_internal
	The MSet::Internal object which we're returning entries from.
bool	decreasing_relevance
	Is the sort order such the relevance decreases down the MSet?

Detailed Description

PostList returning entries from an MSet.

This class is used with the remote backend. We perform a match on the remote server, then serialise the resulting MSet and pass it back to the client where we include it in the match by wrapping it in an MSetPostList.

Definition at line 35 of file msetpostlist.h.

Constructor & Destructor Documentation

MSetPostList::MSetPostList ( const MSetPostList & ) [private]

Don't allow copying.

MSetPostList::MSetPostList	(	const Xapian::MSet	mset,
		bool	decreasing_relevance_
	)			`[inline]`

Definition at line 55 of file msetpostlist.h.

Member Function Documentation

void MSetPostList::operator= ( const MSetPostList & ) [private]

Don't allow assignment.

Xapian::doccount MSetPostList::get_termfreq_min ( ) const [virtual]

Get a lower bound on the number of documents indexed by this term.

Implements Xapian::PostingIterator::Internal.

Definition at line 28 of file msetpostlist.cc.

References DEBUGCALL, mset_internal, and RETURN.

Xapian::doccount MSetPostList::get_termfreq_est ( ) const [virtual]

Get an estimate of the number of documents indexed by this term.

It should always be true that: get_termfreq_min() <= get_termfreq_est() <= get_termfreq_max()

Implements Xapian::PostingIterator::Internal.

Definition at line 35 of file msetpostlist.cc.

References DEBUGCALL, mset_internal, and RETURN.

Xapian::doccount MSetPostList::get_termfreq_max ( ) const [virtual]

Get an upper bound on the number of documents indexed by this term.

Implements Xapian::PostingIterator::Internal.

Definition at line 42 of file msetpostlist.cc.

References DEBUGCALL, mset_internal, and RETURN.

Xapian::weight MSetPostList::get_maxweight ( ) const [virtual]

Return an upper bound on what get_weight() can return.

Implements Xapian::PostingIterator::Internal.

Definition at line 49 of file msetpostlist.cc.

References cursor, DEBUGCALL, decreasing_relevance, mset_internal, and RETURN.

Referenced by recalc_maxweight().

Xapian::docid MSetPostList::get_docid ( ) const [virtual]

Return the current docid.

Implements Xapian::PostingIterator::Internal.

Definition at line 65 of file msetpostlist.cc.

References Assert, cursor, DEBUGCALL, mset_internal, and RETURN.

Xapian::weight MSetPostList::get_weight ( ) const [virtual]

Return the weight contribution for the current position.

Implements Xapian::PostingIterator::Internal.

Definition at line 73 of file msetpostlist.cc.

References Assert, cursor, DEBUGCALL, mset_internal, and RETURN.

const string * MSetPostList::get_collapse_key ( ) const [virtual]

If the collapse key is already known, return it.

This is implemented by MSetPostList (and MergePostList). Other subclasses rely on the default implementation which just returns NULL.

Reimplemented from Xapian::PostingIterator::Internal.

Definition at line 81 of file msetpostlist.cc.

References Assert, cursor, DEBUGCALL, mset_internal, and RETURN.

Xapian::doclength MSetPostList::get_doclength ( ) const [virtual]

Not implemented for MSetPostList.

Implements Xapian::PostingIterator::Internal.

Definition at line 89 of file msetpostlist.cc.

Xapian::weight MSetPostList::recalc_maxweight ( ) [virtual]

Recalculate the upper bound on what get_weight() can return.

If the tree has pruned, get_maxweight() may use cached values. Calling this method instead forces a full recalculation.

Implements Xapian::PostingIterator::Internal.

Definition at line 95 of file msetpostlist.cc.

References DEBUGCALL, get_maxweight(), and RETURN.

PostList * MSetPostList::next ( Xapian::weight w_min ) [virtual]

Advance the current position to the next document in the postlist.

The list starts before the first entry in the list, so next() must be called before any methods which need the context of the current position.

Parameters:

w_min

The minimum weight contribution that is needed (this is just a hint which PostList subclasses may ignore).

Returns:: If a non-NULL pointer is returned, then the caller should substitute the returned pointer for its pointer to us, and then delete us. This "pruning" can only happen for a non-leaf subclass of this class.

Implements Xapian::PostingIterator::Internal.

Definition at line 102 of file msetpostlist.cc.

References Assert, at_end(), cursor, DEBUGCALL, decreasing_relevance, mset_internal, and RETURN.