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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 2004 The Apache Software Foundation
 *
 *   Licensed 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.xmlbeans.impl.common;

import org.apache.xmlbeans.xml.stream.ReferenceResolver;
import org.apache.xmlbeans.xml.stream.XMLEvent;
import org.apache.xmlbeans.xml.stream.XMLInputStream;
import org.apache.xmlbeans.xml.stream.XMLName;
import org.apache.xmlbeans.xml.stream.XMLStreamException;

/**
 * @deprecated XMLInputStream was deprecated by XMLStreamReader from STaX - jsr173 API.
 */
public class GenericXmlInputStream implements XMLInputStream
{
    public GenericXmlInputStream ( )
    {
        _master = this;
        _elementCount = 1; // Go all the way
    }

    private GenericXmlInputStream ( GenericXmlInputStream master )
    {
        (_master = master).ensureInit();
        _nextEvent = master._nextEvent;
    }

    //
    // The source for all events
    //

    protected XMLEvent nextEvent ( ) throws XMLStreamException
    {
        throw new RuntimeException( "nextEvent not overridden" );
    }

    //
    //
    //

    private class EventItem
    {
        EventItem ( XMLEvent e )
        {
            _event = e;
        }

        int     getType ( ) { return _event.getType(); }
        boolean hasName ( ) { return _event.hasName(); }
        XMLName getName ( ) { return _event.getName(); }

        final XMLEvent _event;

        EventItem _next;
    }

    private void ensureInit ( )
    {
        if (!_master._initialized)
        {
            try
            {
                _master._nextEvent = getNextEvent();
            }
            catch ( XMLStreamException e )
            {
                throw new RuntimeException( e );
            }

            _master._initialized = true;
        }
    }

    private EventItem getNextEvent ( ) throws XMLStreamException
    {
        XMLEvent e = nextEvent();

        return e == null ? null : new EventItem( e );
    }

    public XMLEvent next ( ) throws XMLStreamException
    {
        ensureInit();

        EventItem currentEvent = _nextEvent;

        if (_nextEvent != null)
        {
            if (_nextEvent._next == null)
                _nextEvent._next = _master.getNextEvent();

            _nextEvent = _nextEvent._next;
        }

        if (currentEvent == null)
            return null;

        if (currentEvent.getType() == XMLEvent.END_ELEMENT)
        {
            if (--_elementCount <= 0)
                _nextEvent = null;
        }
        else if (currentEvent.getType() == XMLEvent.START_ELEMENT)
            _elementCount++;

        return currentEvent._event;
    }

    public boolean hasNext ( ) throws XMLStreamException
    {
        ensureInit();

        return _nextEvent != null;
    }

    public void skip ( ) throws XMLStreamException
    {
        next();
    }

    public void skipElement ( ) throws XMLStreamException
    {
        ensureInit();

        for ( ; _nextEvent != null ; next() )
        {
            if (_nextEvent.getType() == XMLEvent.START_ELEMENT)
                break;
        }

        int count = 0;

        for ( ; _nextEvent != null ; next() )
        {
            int type = next().getType();

            if (type == XMLEvent.START_ELEMENT)
                count++;
            else if (type == XMLEvent.END_ELEMENT && --count == 0)
                break;
        }
    }

    public XMLEvent peek ( ) throws XMLStreamException
    {
        ensureInit();

        return _nextEvent._event;
    }

    public boolean skip ( int eventType ) throws XMLStreamException
    {
        ensureInit();

        for ( ; _nextEvent != null ; next() )
        {
            if (_nextEvent.getType() == eventType)
                return true;
        }

        return false;
    }

    public boolean skip ( XMLName name ) throws XMLStreamException
    {
        ensureInit();

        for ( ; _nextEvent != null ; next() )
        {
            if (_nextEvent.hasName() && _nextEvent.getName().equals( name ))
                return true;
        }

        return false;
    }

    public boolean skip ( XMLName name, int eventType ) throws XMLStreamException
    {
        ensureInit();

        for ( ; _nextEvent != null ; next() )
        {
            if (_nextEvent.getType() == eventType &&
                  _nextEvent.hasName() &&
                    _nextEvent.getName().equals( name ))
            {
                return true;
            }
        }

        return false;
    }

    public XMLInputStream getSubStream ( ) throws XMLStreamException
    {
        ensureInit();

        GenericXmlInputStream subStream = new GenericXmlInputStream( this );

        subStream.skip( XMLEvent.START_ELEMENT );

        return subStream;
    }

    public void close ( ) throws XMLStreamException
    {
        // BUGBUG - can I do anything here, really?
        // SHould I count the number of open sub streams?
        // I have no destructor, how can I close properly?
    }

    public ReferenceResolver getReferenceResolver ( )
    {
        ensureInit();

        throw new RuntimeException( "Not impl" );
    }

    public void setReferenceResolver ( ReferenceResolver resolver )
    {
        ensureInit();

        throw new RuntimeException( "Not impl" );
    }

    private boolean               _initialized;
    private EventItem             _nextEvent;
    private int                   _elementCount;
    private GenericXmlInputStream _master;
}