create olap modules - api

Signed-off-by: dbulahov <bulahovdenis@gmail.com>

Author: dbulahov

.licenserc.yaml

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+header:
+  license:
+    spdx-id: EPL-2.0
+    copyright-owner: Contributors to the Eclipse Foundation
+    content: |
+      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:
+
+    pattern: |
+      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/
+
+  paths-ignore:
+    - 'dist'
+    - 'licenses'
+    - '**/*.md'
+    - '**/*.MD'
+    - '**/.keep'
+    - '**/*.jetproperties'
+    - '**/*.javajet'
+    - '**/*.javajetinc'
+    - '**/*.json'
+    - '**/*.csv'
+    - '**/*.properties'
+    - '**/*.maven'
+    - '**/*.html'
+    - '**/.classpath'
+    - '**/.editorconfig'
+    - 'LICENSE'
+    - 'NOTICE'
+    - '.gitattributes'
+    - '.github/**'
+    - '.gitignore'
+    - '.licenserc.yaml'
+    - '.readthedocs.yaml'
+    - '.mvn/maven.config'
+    - '**/.project'
+    - '**/*.prefs'
+    - 'license.templates'
+    - '**/logback-test.xml'
+    - '**/*.svg'
+    - '**/*.mdx'
+
+  comment: always

api/pom.xml

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+<?xml version="1.0"?>
+<!--
+/*********************************************************************
+* 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
+**********************************************************************/
+-->
+<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);
+}