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.\"
.IX Title "Lucy::Index::DataReader 3pm"
.TH Lucy::Index::DataReader 3pm "2017-08-02" "perl v5.26.0" "User Contributed Perl Documentation"
.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
.\" way too many mistakes in technical documents.
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.nh
.SH "NAME"
Lucy::Index::DataReader \- Abstract base class for reading index data.
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 1
\&    # Abstract base class.
.Ve
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
DataReader is the companion class to
DataWriter.  Every index component will
implement one of each.
.SH "CONSTRUCTORS"
.IX Header "CONSTRUCTORS"
.SS "new( \fI[labeled params]\fP )"
.IX Subsection "new( [labeled params] )"
.Vb 7
\&    my $reader = MyDataReader\->new(
\&        schema   => $seg_reader\->get_schema,      # default undef
\&        folder   => $seg_reader\->get_folder,      # default undef
\&        snapshot => $seg_reader\->get_snapshot,    # default undef
\&        segments => $seg_reader\->get_segments,    # default undef
\&        seg_tick => $seg_reader\->get_seg_tick,    # default \-1
\&    );
.Ve
.IP "\(bu" 4
\&\fBschema\fR \- A Schema.
.IP "\(bu" 4
\&\fBfolder\fR \- A Folder.
.IP "\(bu" 4
\&\fBsnapshot\fR \- A Snapshot.
.IP "\(bu" 4
\&\fBsegments\fR \- An array of Segments.
.IP "\(bu" 4
\&\fBseg_tick\fR \- The array index of the Segment object within the
\&\f(CW\*(C`segments\*(C'\fR array that this particular DataReader is assigned
to, if any.  A value of \-1 indicates that no Segment should be
assigned.
.SH "ABSTRACT METHODS"
.IX Header "ABSTRACT METHODS"
.SS "aggregator( \fI[labeled params]\fP )"
.IX Subsection "aggregator( [labeled params] )"
Create a reader which aggregates the output of several lower level
readers.  Return undef if such a reader is not valid.
.IP "\(bu" 4
\&\fBreaders\fR \- An array of DataReaders.
.IP "\(bu" 4
\&\fBoffsets\fR \- Doc id start offsets for each reader.
.SH "METHODS"
.IX Header "METHODS"
.SS "\fIget_schema()\fP"
.IX Subsection "get_schema()"
Accessor for \*(L"schema\*(R" member var.
.SS "\fIget_folder()\fP"
.IX Subsection "get_folder()"
Accessor for \*(L"folder\*(R" member var.
.SS "\fIget_snapshot()\fP"
.IX Subsection "get_snapshot()"
Accessor for \*(L"snapshot\*(R" member var.
.SS "\fIget_segments()\fP"
.IX Subsection "get_segments()"
Accessor for \*(L"segments\*(R" member var.
.SS "\fIget_segment()\fP"
.IX Subsection "get_segment()"
Accessor for \*(L"segment\*(R" member var.
.SS "\fIget_seg_tick()\fP"
.IX Subsection "get_seg_tick()"
Accessor for \*(L"seg_tick\*(R" member var.
.SH "INHERITANCE"
.IX Header "INHERITANCE"
Lucy::Index::DataReader isa Lucy::Object::Obj.