org.eclipse.equinox.p2.query

Interface IQuery<T>

Type Parameters:

T - The type of input object that this query accepts

All Known Subinterfaces:

IMatchQuery<T>, IQueryWithIndex<T>

All Known Implementing Classes:

ExpressionMatchQuery, ExpressionQuery, MatchQuery, UpdateQuery

public interface IQuery<T>

The root interface for all queries that can be performed on an IQueryable. A query is a piece of logic that selects some objects from a list of provided inputs using some established criteria.

Any given query must be stable - running the same query on the same inputs must return an equal query result each time the query is executed. Thus a client that has performed a query can freely cache the result as long as they know the query input has not changed.

Since:

2.0

Method Summary

Modifier and Type	Method and Description
IExpression	getExpression() Returns the IExpression backing this query or null if this is not an expression query.
IQueryResult<T>	perform(java.util.Iterator<T> iterator) Evaluates the query for a specific input.

Method Detail

perform

IQueryResult<T> perform(java.util.Iterator<T> iterator)

Evaluates the query for a specific input.

Parameters:

iterator - The elements for which to evaluate the query on

Returns:

The results of the query.

getExpression

IExpression getExpression()

Returns the IExpression backing this query or null if this is not an expression query.

Returns:

An expression or null.