/*
// This software is subject to the terms of the Eclipse Public License v1.0
// Agreement, available at the following URL:
// http://www.eclipse.org/legal/epl-v10.html.
// Copyright (C) 2004-2005 TONBELLER AG
// Copyright (C) 2006-2009 Julian Hyde and others
// All Rights Reserved.
// You must accept the terms of that agreement to use this software.
*/
package mondrian.rolap.sql;
/**
* Restricts the members that are fetched by SqlMemberSource.
*
* @see mondrian.rolap.SqlMemberSource
*
* @author av
* @since Nov 2, 2005
*/
public interface SqlConstraint {
/**
* Returns a key that becomes part of the key for caching the
* result of the SQL query. So SqlConstraint instances that
* produce the same SQL resultset must return equal keys
* in terms of equal() and hashCode().
* @return valid key or null to prevent the result from being cached
*/
Object getCacheKey();
}
// End SqlConstraint.java
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