David E. Wheeler > Lucy-0.2.2 > Lucy::Plan::Schema

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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.

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.

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