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/*
* This file is part of the LibreOffice project.
*
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/.
*
* This file incorporates work covered by the following license notice:
*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed
* with this work for additional information regarding copyright
* ownership. The ASF licenses this file to you under the Apache
* License, Version 2.0 (the "License"); you may not use this file
* except in compliance with the License. You may obtain a copy of
* the License at http://www.apache.org/licenses/LICENSE-2.0 .
*/
package com.sun.star.report;
/**
* Functions are statefull computation components.
*
* Functions are allowed to have a state, but are considered
* immutable (the same is true for expressions). Functions are
* allowed to update their state on every call to 'advance', which
* signals, that the cursor has been moved.
*
* Functions have no way to 'reset' their state, if a reset is needed,
* the report engine is urged to query a new instance from the ReportAddin.
*/
public interface ReportFunction extends ReportExpression
{
public ReportFunction advance(DataRow row);
}
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