Package com.tonic.analysis.query.eval

Class AttributeRegistry

java.lang.Object

com.tonic.analysis.query.eval.AttributeRegistry

public final class AttributeRegistry
extends Object

Maps (SubjectKind, keyword) to a resolver - either a scalar AttributeRegistry.Attribute or a sub-subject AttributeRegistry.Selector.

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static interface	AttributeRegistry.Attribute	Resolves a scalar value from a subject.
static class	AttributeRegistry.Entry	A registered resolver: exactly one of scalar/stream is non-null.
static interface	AttributeRegistry.Selector	Expands a subject into a stream of sub-subjects (honoring the step's index/wildcard).

Constructor Summary

Constructors

Constructor	Description
AttributeRegistry()

Method Summary

Modifier and Type	Method	Description
AttributeRegistry.Entry	lookup(SubjectKind kind, String keyword)	Finds the resolver registered for a keyword; keyword matching is case-insensitive.
void	registerScalar(SubjectKind kind, String keyword, AttributeRegistry.Attribute attribute)	Registers a keyword that resolves to a scalar value.
void	registerStream(SubjectKind kind, String keyword, AttributeRegistry.Selector selector)	Registers a keyword that expands a subject into sub-subjects.

Methods inherited from class java.lang.Object

equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

AttributeRegistry

public AttributeRegistry()

Method Detail

registerScalar

public void registerScalar(SubjectKind kind,
                           String keyword,
                           AttributeRegistry.Attribute attribute)

Registers a keyword that resolves to a scalar value.

Parameters:

kind - the subject kind the keyword applies to

keyword - the attribute keyword

attribute - the resolver

Throws:

IllegalStateException - if the kind and keyword are already registered

registerStream

public void registerStream(SubjectKind kind,
                           String keyword,
                           AttributeRegistry.Selector selector)

Registers a keyword that expands a subject into sub-subjects.

Parameters:

kind - the subject kind the keyword applies to

keyword - the attribute keyword

selector - the expansion

Throws:

IllegalStateException - if the kind and keyword are already registered

lookup

public AttributeRegistry.Entry lookup(SubjectKind kind,
                                      String keyword)

Finds the resolver registered for a keyword; keyword matching is case-insensitive.

Parameters:

kind - the subject kind the keyword is used on

keyword - the attribute keyword

Returns:

the entry, or null if nothing is registered