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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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/**
 * Copyright (C) 2011-2015 The XDocReport Team 
 *
 * All rights reserved.
 *
 * Permission is hereby granted, free  of charge, to any person obtaining
 * a  copy  of this  software  and  associated  documentation files  (the
 * "Software"), to  deal in  the Software without  restriction, including
 * without limitation  the rights to  use, copy, modify,  merge, publish,
 * distribute,  sublicense, and/or sell  copies of  the Software,  and to
 * permit persons to whom the Software  is furnished to do so, subject to
 * the following conditions:
 *
 * The  above  copyright  notice  and  this permission  notice  shall  be
 * included in all copies or substantial portions of the Software.
 *
 * THE  SOFTWARE IS  PROVIDED  "AS  IS", WITHOUT  WARRANTY  OF ANY  KIND,
 * EXPRESS OR  IMPLIED, INCLUDING  BUT NOT LIMITED  TO THE  WARRANTIES OF
 * MERCHANTABILITY,    FITNESS    FOR    A   PARTICULAR    PURPOSE    AND
 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
 * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
 * OF CONTRACT, TORT OR OTHERWISE,  ARISING FROM, OUT OF OR IN CONNECTION
 * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 */
package fr.opensagres.xdocreport.converter;

import java.util.HashMap;
import java.util.Map;
import java.util.Set;
import java.util.logging.Level;
import java.util.logging.Logger;

import fr.opensagres.xdocreport.converter.discovery.IConverterDiscovery;
import fr.opensagres.xdocreport.core.logging.LogUtils;
import fr.opensagres.xdocreport.core.registry.AbstractRegistry;

/**
 * {@link IConverter} registry.
 */
public class ConverterRegistry
    extends AbstractRegistry
{

    private static final ConverterRegistry INSTANCE = new ConverterRegistry();

    /**
     * Logger for this class
     */
    private static final Logger LOGGER = LogUtils.getLogger( ConverterRegistry.class.getName() );

    private Map converters = new HashMap();

    public ConverterRegistry()
    {

        super( IConverterDiscovery.class );

    }

    public static ConverterRegistry getRegistry()
    {
        return INSTANCE;
    }

    public IConverter findConverter( Options options )
        throws XDocConverterException
    {
        return findConverter( options.getFrom(), options.getTo(), options.getVia() );
    }

    public IConverter findConverter( String from, String to, String via )
        throws XDocConverterException
    {
        return internalFindConverter( from, to, via, true );
    }

    public IConverter getConverter( Options options )
    {
        return getConverter( options.getFrom(), options.getTo(), options.getVia() );
    }

    public IConverter getConverter( String from, String to, String via )
    {
        try
        {
            return internalFindConverter( from, to, via, false );
        }
        catch ( XDocConverterException e )
        {
            if ( LOGGER.isLoggable( Level.FINE ) )
            {
                LOGGER.fine( e.getMessage() );
            }
            return null;
        }
    }

    public ConverterFrom getConverterFrom( String from )
    {
        initializeIfNeeded();
        return converters.get( from );
    }

    public Set getFroms()
    {
        initializeIfNeeded();
        return converters.keySet();
    }

    private IConverter internalFindConverter( String from, String to, String via, boolean throwError )
        throws XDocConverterException
    {
        initializeIfNeeded();
        ConverterFrom fromConverters = getConverterFrom( from );
        if ( fromConverters == null )
        {
            if ( throwError )
            {
                String msg = String.format( "Cannot find converters from=%s", from );
                LOGGER.severe( msg );
                throw new XDocConverterException( msg );
            }
            return null;
        }
        ConverterTo toConverters = fromConverters.getConverterTo( to );
        if ( toConverters == null )
        {
            if ( throwError )
            {
                String msg = String.format( "Cannot find converters for to=%s for from=%s", to, from );
                LOGGER.severe( msg );
                throw new XDocConverterException( msg );
            }
            return null;
        }
        if ( via == null )
        {
            IConverter converter = toConverters.getDefaultConverter();
            if ( throwError && converter == null )
            {
                if ( throwError )
                {
                    String msg = String.format( "Cannot find converters for to=%s for from=%s", to, from );
                    LOGGER.severe( msg );
                    throw new XDocConverterException( msg );
                }
            }
            return converter;
        }

        IConverter converter = toConverters.getConverter( via );
        if ( converter == null )
        {
            if ( throwError )
            {
                String msg = String.format( "Cannot find converters via %s for to=%s for from=%s", via, to, from );
                LOGGER.severe( msg );
                throw new XDocConverterException( msg );
            }
        }
        return converter;
    }

    @Override
    protected void doDispose()
    {
        this.converters.clear();
    }

    @Override
    protected boolean registerInstance( IConverterDiscovery discovery )
    {
        String from = discovery.getFrom();
        String to = discovery.getTo();
        String via = discovery.getVia();
        IConverter converter = discovery.getConverter();
        ConverterFrom converterFrom = converters.get( from );
        if ( converterFrom == null )
        {
            converterFrom = new ConverterFrom( from );
            converters.put( converterFrom.getFrom(), converterFrom );
        }
        converterFrom.addConverter( to, via, converter );
        return true;
    }
}