Plucene::Simple - An interface to Plucene


        use Plucene::Simple;

        # create an index
        my $plucy = Plucene::Simple->open($index_path);

        # add to the index
                $id1 => { $field => $term1 }, 
                $id2 => { $field => $term2 }, 

        # or ...
        $plucy->index_document($id => $data);

        # search an existing index
        my $plucy = Plucene::Simple->open($index_path);
        my @results = $plucy->search($search_string);

        # optimize the index

        # remove something from the index

        # is something in the index?
        if ($plucy->indexed($id) { ... }


This provides a simple interface to Plucene. Plucene is large and multi-featured, and it expected that users will subclass it, and tie all the pieces together to suit their own needs. Plucene::Simple is, therefore, just one way to use Plucene. It's not expected that it will do exactly what *you* want, but you can always use it as an example of how to build your own interface.



You make a new Plucene::Simple object like so:

        my $plucy = Plucene::Simple->open($index_path);

If this index doesn't exist, then it will be created for you, otherwise you will be adding to an exisiting one.

Then you can add your documents to the index:


Every document must be indexed with a unique key (which will be returned from searches).

A document can be made up of many fields, which can be added as a hashref:

        $plucy->add($key, \%data);

                chap1  => { 
                        title => "Moby-Dick", 
                        author => "Herman Melville", 
                        text => "Call me Ishmael ..." 
                chap2  => { 
                        title => "Boo-Hoo", 
                        author => "Lydia Lee", 
                        text => "...",


Alternatively, if you do not want to index lots of metadata, but rather just simple text, you can use the index_document() method.

        $plucy->index_document($key, $data);
        $plucy->index_document(chap1 => 'Call me Ishmael ...');





Plucene is set-up to perform insertions quickly. After a bunch of inserts it is good to optimize() the index for better search speed.


        my @ids = $plucy->search('ishmael'); 
          # ("chap1", ...)

This will return the IDs of each document matching the search term.

If you have indexed your documents with fields, you can also search with the field name as a prefix:

        my @ids = $plucy->search("author:lee"); 
                # ("chap2" ...)

        my @results = $plucy->search($search_string);

This will search the index with the given query, and return a list of document ids.

Searches can be much more powerful than this - see Plucene for further details.


        my @results = $lucy->search_during($search_string, $date1, $date2);
        my @results = $lucy->search_during("to:Fred", "2001-01-01" => "2003-12-31");

If your documents were given an ISO 'date' field when indexing, search_during() will restrict the results to all documents between the specified dates. Any document without a 'date' field will be ignored.


        if ($plucy->indexed($id) { ... }

This returns true if there is a document with the given ID in the index.


Copyright (C) 2003-2004 Kasei Limited