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The Apache Commons Codec package contains simple encoder and decoders for various formats such as Base64 and Hexadecimal. In addition to these widely used encoders and decoders, the codec package also maintains a collection of phonetic encoding utilities.

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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.xssf.model;

import org.apache.poi.ss.util.CellAddress;
import org.apache.poi.xssf.usermodel.XSSFComment;

import java.util.Iterator;

/**
 * An interface exposing useful functions for dealing with Excel Workbook Comments.
 * It is intended that this interface should support low level access and not expose
 * all the comments in memory
 */
public interface Comments {

    int getNumberOfComments();

    int getNumberOfAuthors();

    String getAuthor(long authorId);

    int findAuthor(String author);

    /**
     * Finds the cell comment at cellAddress, if one exists
     *
     * @param cellAddress the address of the cell to find a comment
     * @return cell comment if one exists, otherwise returns null
     */
    XSSFComment findCellComment(CellAddress cellAddress);

    /**
     * Remove the comment at cellRef location, if one exists
     *
     * @param cellRef the location of the comment to remove
     * @return returns true if a comment was removed
     */
    boolean removeComment(CellAddress cellRef);

    /**
     * Returns all cell addresses that have comments.
     * @return An iterator to traverse all cell addresses that have comments.
     * @since 4.0.0
     */
    Iterator getCellAddresses();
}