create olap modules - api

Signed-off-by: dbulahov <[email protected]>

Author: dbulahov

api/pom.xml

@@ -0,0 +1,44 @@
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+	xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
+	<modelVersion>4.0.0</modelVersion>
+	<parent>
+		<groupId>org.eclipse.daanse</groupId>
+		<artifactId>org.eclipse.daanse.olap</artifactId>
+		<version>${revision}</version>
+	</parent>
+	<artifactId>org.eclipse.daanse.olap.api</artifactId>
+	<packaging>jar</packaging>
+
+	<dependencies>
+		<dependency>
+			<groupId>org.osgi</groupId>
+			<artifactId>org.osgi.annotation.versioning</artifactId>
+			<version>1.1.2</version>
+		</dependency>
+		<dependency>
+			<groupId>org.osgi</groupId>
+			<artifactId>org.osgi.annotation.bundle</artifactId>
+		</dependency>
+		<dependency>
+			<groupId>org.eclipse.daanse</groupId>
+			<artifactId>org.eclipse.daanse.jdbc.db.dialect.api</artifactId>
+			<version>0.0.1-SNAPSHOT</version>
+		</dependency>
+		<dependency>
+			<groupId>org.eclipse.daanse</groupId>
+			<artifactId>org.eclipse.daanse.mdx.parser.api</artifactId>
+			<version>0.0.1-SNAPSHOT</version>
+		</dependency>
+		<dependency>
+			<groupId>org.eclipse.daanse</groupId>
+			<artifactId>org.eclipse.daanse.sql.guard.api</artifactId>
+			<version>0.0.1-SNAPSHOT</version>
+		</dependency>
+		<dependency>
+			<groupId>org.eclipse.daanse</groupId>
+			<artifactId>org.eclipse.daanse.mdx.model.api</artifactId>
+			<version>0.0.1-SNAPSHOT</version>
+		</dependency>
+	</dependencies>
+</project>

api/src/main/java/org/eclipse/daanse/olap/api/AggregationFactory.java

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+/*
+ * Copyright (c) 2024 Contributors to the Eclipse Foundation.
+ *
+ * This program and the accompanying materials are made
+ * available under the terms of the Eclipse Public License 2.0
+ * which is available at https://www.eclipse.org/legal/epl-2.0/
+ *
+ * SPDX-License-Identifier: EPL-2.0
+ *
+ * Contributors:
+ *   SmartCity Jena - initial
+ *   Stefan Bischof (bipolis.org) - initial
+ */
+package org.eclipse.daanse.olap.api;
+
+import org.eclipse.daanse.olap.api.aggregator.Aggregator;
+
+public interface AggregationFactory {
+    Aggregator getAggregator(Object measure);
+}