org.prevayler
Interface Query<P,R>

Type Parameters:

P - The type or any supertype of the Prevalent System you intend to perform the query upon.

R - The type of object which should be returned.

All Superinterfaces:

Serializable

All Known Implementing Classes:

NullQuery, ProxyQuery

public interface Query<P,R>
extends Serializable

Represents a query that can be executed on a Prevalent System.

See Also:

Prevayler.execute(Query)

Method Summary

R	query(P prevalentSystem, Date executionTime)

Method Detail

query

R query(P prevalentSystem,
        Date executionTime)
        throws Exception

Parameters:

prevalentSystem - The Prevalent System to be queried.

executionTime - The "current" time.

Returns:

The result of this Query.

Throws:

Exception - Any Exception encountered by this Query.