Package 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:
ArtifactDescriptorQuery
,ArtifactKeyQuery
,ExpressionMatchQuery
,ExpressionQuery
,IUProfilePropertyQuery
,MatchQuery
,OSGiBundleQuery
,UserVisibleRootQuery
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
- Restriction:
- This interface is not intended to be implemented directly by clients.
- Restriction:
- This interface is not intended to be extended directly by clients.
-
Method Summary
Modifier and TypeMethodDescriptionReturns the IExpression backing this query ornull
if this is not an expression query.Evaluates the query for a specific input.
-
Method Details
-
perform
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 ornull
if this is not an expression query.- Returns:
- An expression or
null
.
-