#include <mergepostlist.h>
Inheritance diagram for MergePostList:
Public Member Functions | |
Xapian::termcount | get_wdf () const |
Return the wdf for the document at the current position. | |
Xapian::doccount | get_termfreq_max () const |
Get an upper bound on the number of documents indexed by this term. | |
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::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::weight | get_maxweight () const |
Return an upper bound on what get_weight() can return. | |
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) |
Skip forward to the specified docid. | |
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. | |
virtual Xapian::doclength | get_doclength () const |
Return the document length of the document the current term comes from. | |
MergePostList (vector< PostList * > plists_, MultiMatch *matcher, Xapian::ErrorHandler *errorhandler_) | |
~MergePostList () | |
Private Member Functions | |
MergePostList (const MergePostList &) | |
MergePostList & | operator= (const MergePostList &) |
Private Attributes | |
Xapian::weight | w_max |
vector< PostList * > | plists |
int | current |
MultiMatch * | matcher |
The object which is using this postlist to perform a match. | |
Xapian::ErrorHandler * | errorhandler |
Definition at line 31 of file mergepostlist.h.
MergePostList::MergePostList | ( | const MergePostList & | ) | [private] |
MergePostList::MergePostList | ( | vector< PostList * > | plists_, | |
MultiMatch * | matcher, | |||
Xapian::ErrorHandler * | errorhandler_ | |||
) |
MergePostList::~MergePostList | ( | ) |
MergePostList& MergePostList::operator= | ( | const MergePostList & | ) | [private] |
Xapian::termcount MergePostList::get_wdf | ( | ) | const [virtual] |
Return the wdf for the document at the current position.
The default implementation throws Xapian::UnimplementedError.
Reimplemented from Xapian::PostingIterator::Internal.
Definition at line 93 of file mergepostlist.cc.
Xapian::doccount MergePostList::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 100 of file mergepostlist.cc.
Xapian::doccount MergePostList::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 113 of file mergepostlist.cc.
Xapian::doccount MergePostList::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 126 of file mergepostlist.cc.
Xapian::docid MergePostList::get_docid | ( | ) | const [virtual] |
Return the current docid.
Implements Xapian::PostingIterator::Internal.
Definition at line 139 of file mergepostlist.cc.
Xapian::weight MergePostList::get_weight | ( | ) | const [virtual] |
Return the weight contribution for the current position.
Implements Xapian::PostingIterator::Internal.
Definition at line 149 of file mergepostlist.cc.
const string * MergePostList::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 157 of file mergepostlist.cc.
Xapian::weight MergePostList::get_maxweight | ( | ) | const [virtual] |
Return an upper bound on what get_weight() can return.
Implements Xapian::PostingIterator::Internal.
Definition at line 165 of file mergepostlist.cc.
Xapian::weight MergePostList::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 172 of file mergepostlist.cc.
References current, DEBUGCALL, DEBUGLINE, errorhandler, plists, w(), and w_max.
PostList * MergePostList::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.
w_min | The minimum weight contribution that is needed (this is just a hint which PostList subclasses may ignore). |
Implements Xapian::PostingIterator::Internal.
Definition at line 53 of file mergepostlist.cc.
References at_end(), current, DEBUGCALL, DEBUGLINE, errorhandler, matcher, next_handling_prune(), plists, and RETURN.
PostList * MergePostList::skip_to | ( | Xapian::docid | , | |
Xapian::weight | w_min | |||
) | [virtual] |
Skip forward to the specified docid.
If the specified docid isn't in the list, position ourselves on the first document after it (or at_end() if no greater docids are present).
w_min | The minimum weight contribution that is needed (this is just a hint which PostList subclasses may ignore). |
Implements Xapian::PostingIterator::Internal.
Definition at line 82 of file mergepostlist.cc.
References DEBUGCALL.
bool MergePostList::at_end | ( | ) | const [virtual] |
Return true if the current position is past the last entry in this list.
Implements Xapian::PostingIterator::Internal.
Definition at line 202 of file mergepostlist.cc.
References Assert, current, DEBUGCALL, and plists.
Referenced by next().
string MergePostList::get_description | ( | ) | const [virtual] |
Return a string description of this object.
Implements Xapian::PostingIterator::Internal.
Definition at line 210 of file mergepostlist.cc.
References plists.
Xapian::doclength MergePostList::get_doclength | ( | ) | const [virtual] |
Return the document length of the document the current term comes from.
Implements Xapian::PostingIterator::Internal.
Definition at line 221 of file mergepostlist.cc.
Xapian::weight MergePostList::w_max [private] |
Definition at line 37 of file mergepostlist.h.
Referenced by get_maxweight(), and recalc_maxweight().
vector<PostList *> MergePostList::plists [private] |
Definition at line 39 of file mergepostlist.h.
Referenced by at_end(), get_collapse_key(), get_description(), get_docid(), get_doclength(), get_termfreq_est(), get_termfreq_max(), get_termfreq_min(), get_wdf(), get_weight(), next(), recalc_maxweight(), and ~MergePostList().
int MergePostList::current [private] |
Definition at line 41 of file mergepostlist.h.
Referenced by at_end(), get_collapse_key(), get_docid(), get_doclength(), get_wdf(), get_weight(), next(), and recalc_maxweight().
MultiMatch* MergePostList::matcher [private] |
The object which is using this postlist to perform a match.
This object needs to be notified when the tree changes such that the maximum weights need to be recalculated.
Definition at line 48 of file mergepostlist.h.
Referenced by next().
Xapian::ErrorHandler* MergePostList::errorhandler [private] |