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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.hwpf.usermodel;

import java.util.HashMap;
import java.util.Map;

import org.apache.poi.hwpf.model.NotesTables;

/**
 * Default implementation of {@link Notes} interface
 * 
 * @author Sergey Vladimirov (vlsergey {at} gmail {doc} com)
 */
public class NotesImpl implements Notes
{
    private Map anchorToIndexMap;

    private final NotesTables notesTables;

    public NotesImpl( NotesTables notesTables )
    {
        this.notesTables = notesTables;
    }

    public int getNoteAnchorPosition( int index )
    {
        return notesTables.getDescriptor( index ).getStart();
    }

    public int getNoteIndexByAnchorPosition( int anchorPosition )
    {
        updateAnchorToIndexMap();

        Integer index = anchorToIndexMap
                .get( Integer.valueOf( anchorPosition ) );
        if ( index == null )
            return -1;

        return index.intValue();
    }

    public int getNotesCount()
    {
        return notesTables.getDescriptorsCount();
    }

    public int getNoteTextEndOffset( int index )
    {
        return notesTables.getTextPosition( index ).getEnd();
    }

    public int getNoteTextStartOffset( int index )
    {
        return notesTables.getTextPosition( index ).getStart();
    }

    private void updateAnchorToIndexMap()
    {
        if ( anchorToIndexMap != null )
            return;

        Map result = new HashMap<>();
        for ( int n = 0; n < notesTables.getDescriptorsCount(); n++ )
        {
            int anchorPosition = notesTables.getDescriptor( n ).getStart();
            result.put( Integer.valueOf( anchorPosition ), Integer.valueOf( n ) );
        }
        this.anchorToIndexMap = result;
    }
}