edu.illinois.cs.cogcomp.core.datastructures

Interface IQueryable<T>

Type Parameters:

T - The type of objects in the queryable iterator

All Superinterfaces:

Iterable<T>

All Known Implementing Classes:

CoreferenceView, PredicateArgumentView, QueryableList, SpanLabelView, TokenLabelView, TreeView, View

public interface IQueryable<T>
extends Iterable<T>

An interface that allows SQL like querying over objects. This is inspired by C#'s linq. Any iterator that implements this interface should allow querying over the elements of the iterator.

Author:

Vivek Srikumar

Method Summary

Modifier and Type	Method and Description
int	count() Get the number of records in this iterator.
IQueryable<T>	orderBy(Comparator<T> comparator) Returns a queryable iterator, where the elements of this iterator are sorted using the comparator.
<S> IQueryable<S>	select(ITransformer<T,S> transformer) Given a transformer that converts objects of type T to those of type S, this function returns a new queryable iterator, containing objects of type S which are created by applying the transformer to each element of this iterator.
IQueryable<T>	unique() Get a queryable iterator containing the unique elements of this iterator.
IQueryable<T>	where(Predicate<T> condition) Get a queryable iterator that contains the elements of this iterator which satisfy the condition.

Methods inherited from interface java.lang.Iterable

forEach, iterator, spliterator

Method Detail

where

IQueryable<T> where(Predicate<T> condition)

Get a queryable iterator that contains the elements of this iterator which satisfy the condition.

Parameters:

condition - A Predicate, which takes an object of type T and returns true/false.

Returns:

A queryable iterator containing only those elements for which the condition is true.

orderBy

IQueryable<T> orderBy(Comparator<T> comparator)

Returns a queryable iterator, where the elements of this iterator are sorted using the comparator.

Parameters:

comparator - The comparator for type T

Returns:

A sorted queryable iterator

select

<S> IQueryable<S> select(ITransformer<T,S> transformer)

Given a transformer that converts objects of type T to those of type S, this function returns a new queryable iterator, containing objects of type S which are created by applying the transformer to each element of this iterator.

Type Parameters:

S - The type of the elements of the returned iterator

Parameters:

transformer - An ITransformer that converts objects of type T to those of type S

Returns:

A queryable iterator containing objects of type S.

unique

IQueryable<T> unique()

Get a queryable iterator containing the unique elements of this iterator.

count

int count()

Get the number of records in this iterator.