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Diffstat (limited to 'reportbuilder/java/com/sun/star/report/ReportExpression.java')
-rw-r--r-- | reportbuilder/java/com/sun/star/report/ReportExpression.java | 51 |
1 files changed, 51 insertions, 0 deletions
diff --git a/reportbuilder/java/com/sun/star/report/ReportExpression.java b/reportbuilder/java/com/sun/star/report/ReportExpression.java new file mode 100644 index 000000000000..a828ee6ddba4 --- /dev/null +++ b/reportbuilder/java/com/sun/star/report/ReportExpression.java @@ -0,0 +1,51 @@ +/************************************************************************* + * + * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. + * + * Copyright 2000, 2010 Oracle and/or its affiliates. + * + * OpenOffice.org - a multi-platform office productivity suite + * + * This file is part of OpenOffice.org. + * + * OpenOffice.org is free software: you can redistribute it and/or modify + * it under the terms of the GNU Lesser General Public License version 3 + * only, as published by the Free Software Foundation. + * + * OpenOffice.org 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. See the + * GNU Lesser General Public License version 3 for more details + * (a copy is included in the LICENSE file that accompanied this code). + * + * You should have received a copy of the GNU Lesser General Public License + * version 3 along with OpenOffice.org. If not, see + * <http://www.openoffice.org/license.html> + * for a copy of the LGPLv3 License. + * + ************************************************************************/ +package com.sun.star.report; + +/** + * Expressions are simple computation components. + * + * Expressions are always assumed to be immutable. They are not allowed to + * change their state and it is not guaranteed, in which order they get called. + * If the expression has been called before, the last computed value will be + * available from the datarow. + * + * This construct allows us to write expressions in the form + * "Sum := Sum + Column". + * + * Multiple calls to getValue on the same expression instance must return the + * same value (assuming that the datarow passed in is the same). + */ +public interface ReportExpression +{ + + void setParameters(Object[] parameters); + + Object getParameters(); + + Object getValue(DataRow row); +} |