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Apache POI - Java API To Access Microsoft Format Files
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/* ====================================================================
   Licensed to the Apache Software Foundation (ASF) under one or more
   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

   Unless required by applicable law or agreed to in writing, software
   distributed under the License is distributed on an "AS IS" BASIS,
   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   See the License for the specific language governing permissions and
   limitations under the License.
==================================================================== */

package org.apache.poi.xslf.usermodel;

import org.apache.poi.POIXMLDocumentPart;
import org.apache.poi.openxml4j.opc.PackagePart;
import org.apache.poi.openxml4j.opc.PackageRelationship;
import org.apache.poi.util.Beta;
import org.apache.xmlbeans.XmlException;
import org.openxmlformats.schemas.presentationml.x2006.main.CTComment;
import org.openxmlformats.schemas.presentationml.x2006.main.CTCommentList;
import org.openxmlformats.schemas.presentationml.x2006.main.CmLstDocument;

import java.io.IOException;

@Beta
public class XSLFComments extends POIXMLDocumentPart {
    private final CTCommentList _comments;
    
    /**
     * Create a new set of slide comments
     */
    XSLFComments() {
       super();
       CmLstDocument doc = CmLstDocument.Factory.newInstance();
       _comments = doc.addNewCmLst();
    }

    /**
     * Construct a SpreadsheetML slide comments from a package part
     *
     * @param part the package part holding the comments data,
     * the content type must be application/vnd.openxmlformats-officedocument.comments+xml
     * @param rel  the package relationship holding this comments,
     * the relationship type must be http://schemas.openxmlformats.org/officeDocument/2006/relationships/comments
     */
    XSLFComments(PackagePart part, PackageRelationship rel) throws IOException, XmlException {
        super(part, rel);

        CmLstDocument doc =
           CmLstDocument.Factory.parse(getPackagePart().getInputStream());
        _comments = doc.getCmLst();
    }
    
    public CTCommentList getCTCommentsList() {
       return _comments;
    }
    
    public int getNumberOfComments() {
       return _comments.sizeOfCmArray();
    }
    
    public CTComment getCommentAt(int pos) {
       return _comments.getCmArray(pos);
    }
}