Query


1   //Prevayler(TM) - The Free-Software Prevalence Layer.
2   //Copyright (C) 2001-2003 Klaus Wuestefeld
3   //This library is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
4   
5   package org.prevayler;
6   
7   import java.util.Date  ;
8   
9   /** Represents a query that can be executed on a Prevalent System.
10   * @see org.prevayler.Prevayler#execute(Query)
11   */
12  public interface Query {
13      
14      /**
15       * @param prevalentSystem The Prevalent System to be queried.
16       * @param executionTime The "current" time.
17       * @return The result of this Query.
18       * @throws Exception Any Exception encountered by this Query.
19       */
20      public Object   query(Object   prevalentSystem, Date   executionTime) throws Exception  ;
21  
22  }
23

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