com.bigdata.bop

Interface IConstant<E>

All Superinterfaces:

BOp, Cloneable, IPropertySet, IValueExpression<E>, IVariableOrConstant<E>, Serializable

All Known Implementing Classes:

Constant

public interface IConstant<E>
extends IVariableOrConstant<E>

A constant.

Note: IConstant does not implement Comparable for two reasons:

1. Constants wrapping different data types are not comparable. Rigid schema data models such as SQL do not have this problem since columns have a single data type, but schema flexible object models and RDF both have runtime determination of the data type.
2. The specifics of the ordering to be imposed are generally determined by a high level query language (SPARQL, XQUERY, SQL, etc). Thus even if this interface was Comparable, SORT operators generally must provide their own ordering semantics.

Version:

$Id$

Author:

Bryan Thompson

Nested Class Summary

Nested classes/interfaces inherited from interface com.bigdata.bop.BOp

BOp.Annotations

Field Summary

Fields inherited from interface com.bigdata.bop.BOp

NOANNS, NOARGS

Method Summary

Methods

Modifier and Type	Method and Description
int	hashCode() The hash code of the value that would be returned by IVariableOrConstant.get()

Methods inherited from interface com.bigdata.bop.IVariableOrConstant

equals, get, getName, isConstant, isVar

Methods inherited from interface com.bigdata.bop.IValueExpression

get, toString

Methods inherited from interface com.bigdata.bop.BOp

annotations, argIterator, args, arity, clone, get, getEvaluationContext, getId, getProperty, getRequiredProperty, isController, setProperty, toArray, toArray, toShortString, toString

Methods inherited from interface cutthecrap.utils.striterators.IPropertySet

getProperty

Method Detail

hashCode

int hashCode()

The hash code of the value that would be returned by IVariableOrConstant.get()

Overrides:

hashCode in class Object