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.IX Title "Plucene::Index::Reader 3pm"
.TH Plucene::Index::Reader 3pm "2018-04-02" "perl v5.26.1" "User Contributed Perl Documentation"
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.SH "NAME"
Plucene::Index::Reader \- Abstract class for accessing an index
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
IndexReader is an abstract class, providing an interface for accessing an
index.  Search of an index is done entirely through this abstract interface, so
that any subclass which implements it is searchable.
.PP
Concrete subclasses of IndexReader are usually constructed with a call to the
static method \*(L"open\*(R".
.PP
For efficiency, in this \s-1API\s0 documents are often referred to via document
numbers, non-negative integers which each name a unique document in the index.
These document numbers are ephemeral\*(--they may change as documents are added to
and deleted from an index.  Clients should thus not rely on a given document
having the same number between sessions.
.SH "METHODS"
.IX Header "METHODS"
.SS "new"
.IX Subsection "new"
.Vb 1
\&        my $reader = Plucene::Index::Reader\->new($dir_name);
.Ve
.PP
This will create a new Plucene::Index::Reader with the passed in directory.
.SS "open"
.IX Subsection "open"
.Vb 2
\&        # If there is only one segment
\&        my Plucene::Index::SegmentReader $seg_read = $reader\->open;
\&
\&        # If there are many segments
\&        my Plucene::Index::SegmentsReader $seg_read = $reader\->open;
.Ve
.PP
Returns an IndexReader reading the index in the given Directory.
.SS "last_modified"
.IX Subsection "last_modified"
.Vb 1
\&        my $last_modified = Plucene::Index::Reader\->last_modified($directory);
.Ve
.SS "index_exists"
.IX Subsection "index_exists"
.Vb 1
\&        if (Plucene::Index::Reader\->index_exists($directory)){ ... }
.Ve
.SS "is_locked"
.IX Subsection "is_locked"
.Vb 1
\&        if (Plucene::Index::Reader\->is_locked($directory)){ ... }
.Ve
.SS "delete"
.IX Subsection "delete"
.Vb 1
\&        $reader\->delete($doc);
.Ve
.SS "delete_term"
.IX Subsection "delete_term"
.Vb 1
\&        $reader\->delete_term($term);
.Ve
.PP
This will delete all the documents which contain the passed term.
.SS "close"
.IX Subsection "close"
.Vb 1
\&        $reader\->close;
.Ve
.SS "unlock"
.IX Subsection "unlock"
.Vb 1
\&        $reader\->unlock($directory);
.Ve
.SS "num_docs / max_doc / document / is_deleted / norms / terms / doc_freq / term_docs / term_positions / _do_delete / _do_close"
.IX Subsection "num_docs / max_doc / document / is_deleted / norms / terms / doc_freq / term_docs / term_positions / _do_delete / _do_close"
These must be defined in a subclass