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);
+}