NAME

       Lucy::Plan::Schema - User-created specification for an inverted index.

SYNOPSIS

           use Lucy::Plan::Schema;
           use Lucy::Plan::FullTextType;
           use Lucy::Analysis::PolyAnalyzer;

           my $schema = Lucy::Plan::Schema->new;
           my $polyanalyzer = Lucy::Analysis::PolyAnalyzer->new(
               language => 'en',
           );
           my $type = Lucy::Plan::FullTextType->new(
               analyzer => $polyanalyzer,
           );
           $schema->spec_field( name => 'title',   type => $type );
           $schema->spec_field( name => 'content', type => $type );

DESCRIPTION

       A Schema is a specification which indicates how other entities should interpret the raw
       data in an inverted index and interact with it.

       Once an actual index has been created using a particular Schema, existing field
       definitions may not be changed.  However, it is possible to add new fields during
       subsequent indexing sessions.

CONSTRUCTORS

   new()
           my $schema = Lucy::Plan::Schema->new;

       Constructor.  Takes no arguments.

METHODS

   spec_field( [labeled params] )
       Define the behavior of a field by associating it with a FieldType.

       If this method has already been called for the supplied "field", it will merely test to
       verify that the supplied FieldType equals() the existing one.

       •   name - The name of the field.

       •   type - A FieldType.

   num_fields()
       Return the number of fields currently defined.

   all_fields()
       Return all the Schema's field names as an array.

   fetch_type(field)
       Return the FieldType for the specified field.  If the field can't be found, return undef.

   fetch_sim(field)
       Return the Similarity for the specified field, or undef if either the field can't be found
       or it isn't associated with a Similarity.

   architecture()
       Factory method which creates an Architecture object for this index.

   get_architecture()
       Return the Schema instance's internal Architecture object.

   get_similarity()
       Return the Schema instance's internal Similarity object.

INHERITANCE

       Lucy::Plan::Schema isa Lucy::Object::Obj.