poi/src/ooxml/java/org/apache/poi/POIXMLFactory.java

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   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

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package org.apache.poi;

import org.apache.poi.openxml4j.opc.PackageRelationship;
import org.apache.poi.openxml4j.opc.PackagePart;

/**
 * Defines a factory API that enables sub-classes to create instances of <code>POIXMLDocumentPart</code>
 *
 * @author Yegor Kozlov
 */
public abstract class POIXMLFactory {

    /**
     * Create a POIXMLDocumentPart from existing package part and relation. This method is called
     * from {@link POIXMLDocument#load(POIXMLFactory)} when parsing a document
     *
     * @param rel   the package part relationship
     * @param part  the PackagePart representing the created instance
     * @return A new instance of a POIXMLDocumentPart.
     */
     public abstract POIXMLDocumentPart createDocumentPart(PackageRelationship rel, PackagePart part);

    /**
     * Create a new POIXMLDocumentPart using the supplied descriptor. This method is used when adding new parts
     * to a document, for example, when adding a sheet to a workbook, slide to a presentation, etc.
     *
     * @param descriptor  describes the object to create
     * @return A new instance of a POIXMLDocumentPart.
     */
     public abstract POIXMLDocumentPart newDocumentPart(POIXMLRelation descriptor);
}