for (String name : names)
        {
            removeAttribute(name);
        }
    }

    @Override
    public final boolean containsKey(final Object key)
    {
        return getAttribute(key.toString()) != null;
    }

    @Override
    public boolean containsValue(final Object findValue)
    {
        if (findValue == null)
        {
            return false;
        }

        for (final Enumeration<String> e = getAttributeNames(); e.hasMoreElements();)
        {
            final Object value = getAttribute(e.nextElement());
            if (findValue.equals(value))
            {
                return true;
            }
        }

        return false;
    }

    @Override
    public Set<Entry<String, V>> entrySet()
    {
        return (_entrySet != null) ? _entrySet : (_entrySet = new EntrySet());
    }

    @Override
    public V get(final Object key)
    {
        return getAttribute(key.toString());
    }

    @Override
    public boolean isEmpty()
    {
        return !getAttributeNames().hasMoreElements();
    }

    @Override
    public Set<String> keySet()
    {
        return (_keySet != null) ? _keySet : (_keySet = new KeySet());
    }

    @Override
    public final V put(final String key, final V value)
    {
        final V retval = getAttribute(key);
        setAttribute(key, value);
        return retval;
    }

    @Override
    public void putAll(final Map<? extends String, ? extends V> t)
    {
        for (final Entry<? extends String, ? extends V> entry : t.entrySet())
        {
            setAttribute(entry.getKey(), entry.getValue());
        }
    }

    @Override
    public final V remove(final Object key)
    {
        final String key_ = key.toString();
        final V retval = getAttribute(key_);
        removeAttribute(key_);
        return retval;
    }

    @Override
    public int size()
    {
        int size = 0;
        for (final Enumeration<String> e = getAttributeNames(); e.hasMoreElements();)
        {
            size++;
            e.nextElement();
        }
        return size;
    }

    @Override
    public Collection<V> values()
    {
        return (_values != null) ? _values : (_values = new Values());
    }

    abstract protected V getAttribute(String key);

    abstract protected void setAttribute(String key, V value);

    abstract protected void removeAttribute(String key);

    abstract protected Enumeration<String> getAttributeNames();

    private abstract class AbstractAttributeSet<E> extends AbstractSet<E>
    {
        @Override
        public boolean isEmpty()
        {
            return AbstractThreadSafeAttributeMap.this.isEmpty();

            return getValue(_currentKey = _i.next());
        }

        protected abstract E getValue(String attributeName);
    }

    private final class KeyIterator extends AbstractAttributeIterator<String>
    {
        @Override
        protected String getValue(final String attributeName)
        {
            return attributeName;
        }
    }

    private class Values extends AbstractAttributeSet<V>
    {
        @Override
        public Iterator<V> iterator()
        {
            return new ValuesIterator();
        }

        @Override
        public boolean contains(final Object o)
        {
            if (o == null)
            {
                return false;
            }

            for (final Iterator<V> it = iterator(); it.hasNext();)
            {
                if (o.equals(it.next()))
                {
                    return true;
                }
            }

            return false;
        }

        @Override
        public boolean remove(final Object o)
        {
            if (o == null)
            {
                return false;
            }

            for (final Iterator<V> it = iterator(); it.hasNext();)
            {
                if (o.equals(it.next()))
                {
                    it.remove();
                    return true;
                }
            }

            return false;
        }
    }

    private class ValuesIterator extends AbstractAttributeIterator<V>
    {
        @Override
        protected V getValue(final String attributeName)
        {
            return AbstractThreadSafeAttributeMap.this.get(attributeName);

    protected Validator createValidator() throws javax.servlet.jsp.JspException
    {
        FacesContext facesContext = FacesContext.getCurrentInstance();
        ELContext elContext = facesContext.getELContext();
        if (null != _binding)
        {
            Object validator;
            try
            {
                validator = _binding.getValue(elContext);
            } catch (Exception e)
            {
                throw new JspException("Error while creating the Validator", e);
            }
            if (validator instanceof Validator)
            {
                return (Validator) validator;
            }
        }
        Application application = facesContext.getApplication();
        Validator validator = null;
        try
        {
            // first check if an ValidatorId was set by a method
            if (null != _validatorIdString)
            {
                validator = application.createValidator(_validatorIdString);
            } else if (null != _validatorId)
            {
                String validatorId = (String) _validatorId.getValue(elContext);
                validator = application.createValidator(validatorId);
            }
        } catch (Exception e)
        {
            throw new JspException("Error while creating the Validator", e);
        }

        if (null != validator)
        {
            if (null != _binding)
            {
                _binding.setValue(elContext, validator);
            }
            return validator;
        }
        throw new JspException("validatorId and/or binding must be specified");
    }

}

    public void addDescription(String value)
    {
        if(_description == null)
            _description = new ArrayList<String>();

        _description.add(value);
    }

    public Iterator<String> getDescriptions()
    {
        if(_description==null)
            return Collections.EMPTY_LIST.iterator();

        return _description.iterator();
    }

    public void addDisplayName(String value)
    {
        if(_displayName == null)
            _displayName = new ArrayList<String>();

        _displayName.add(value);
    }

    public Iterator<String> getDisplayNames()
    {
        if(_displayName==null)
            return Collections.EMPTY_LIST.iterator();

        return _displayName.iterator();
    }

    public void addIcon(String value)
    {
        if(_icon == null)
            _icon = new ArrayList<String>();

        _icon.add(value);
    }

    public Iterator<String> getIcons()
    {
        if(_icon==null)
            return Collections.EMPTY_LIST.iterator();

        return _icon.iterator();
    }

    public void setPropertyName(String propertyName)

    protected Converter createConverter()
            throws JspException
    {
        Converter converter = null;

        FacesContext facesContext = FacesContext.getCurrentInstance();
        ELContext elContext = facesContext.getELContext();

        // try to create the converter from the binding expression first, and then from
        // the converterId
        if (_binding != null)
        {
            try
            {
                converter = (Converter) _binding.getValue(elContext);

                if (converter != null)
                {
                    return converter;
                }
            }
            catch (Exception e)
            {
                throw new JspException("Exception creating converter using binding", e);
            }
        }

        if ((_converterId != null) || (_converterIdString != null))
        {
            try
            {
                if (null != _converterIdString)
                {
                    converter = facesContext.getApplication().createConverter(_converterIdString);
                } else 
                {
                    String converterId = (String) _converterId.getValue(elContext);
                    converter = facesContext.getApplication().createConverter(converterId);
                }

                // with binding no converter was created, set its value with the converter
                // created using the converterId
                if (converter != null && _binding != null)
                {
                    _binding.setValue(elContext, converter);
                }
            }
            catch (Exception e)
            {
                throw new JspException("Exception creating converter with converterId: " + _converterId, e);
            }
        }

        return converter;
    }

}

            return AbstractThreadSafeAttributeMap.this.put(_currentKey, value);
        }

        @Override
        public int hashCode()
        {
            int result = 1;
            result = 31 * result + ((_currentKey == null) ? 0 : _currentKey.hashCode());
            return result;
        }

        @Override
        public boolean equals(final Object obj)
        {
            if (this == obj)
                return true;
            if (obj == null)
                return false;
            if (getClass() != obj.getClass())
                return false;
            final EntrySetEntry other = (EntrySetEntry)obj;
            if (_currentKey == null)
            {
                if (other._currentKey != null)
                    return false;
            }
            else if (!_currentKey.equals(other._currentKey))
                return false;
            return true;
        }

    }
}

            return AbstractThreadSafeAttributeMap.this.get(attributeName);
        }
    }

    private final class EntrySet extends AbstractAttributeSet<Entry<String, V>>
    {
        @Override
        public Iterator<Entry<String, V>> iterator()
        {
            return new EntryIterator();
        }

        @SuppressWarnings("unchecked")
        @Override
        public boolean contains(final Object o)
        {
            if (!(o instanceof Entry))
            {
                return false;
            }

            final Entry<String, V> entry = (Entry<String, V>)o;
            final Object key = entry.getKey();
            final Object value = entry.getValue();
            if (key == null || value == null)
            {
                return false;
            }

            return value.equals(AbstractThreadSafeAttributeMap.this.get(key));

    public DelegateValueChangeListener(ValueExpression type, ValueExpression binding)
    {
        super();
        _type = type;
        _binding = binding;
    }

    public boolean isTransient()
    {
        return false;
    }

    public void restoreState(FacesContext facesContext, Object state)
    {
        Object[] values = (Object[]) state;
        _type = (ValueExpression) values[0];
        _binding = (ValueExpression) values[1];
    }

    public Object saveState(FacesContext facesContext)
    {
        Object[] values = new Object[2];
        values[0] = _type;
        values[1] = _binding;
        return values;
    }

    public void setTransient(boolean arg0)
    {
        // Do nothing        
    }

    private ValueChangeListener _getDelegate()

            return AbstractThreadSafeAttributeMap.this.remove(((Entry<String, V>)o).getKey()) != null;
        }
    }

    /**
     * Not very efficient since it generates a new instance of <code>Entry</code> for each element and still internaly
     * uses the <code>KeyIterator</code>. It is more efficient to use the <code>KeyIterator</code> directly.
     */
    private final class EntryIterator extends AbstractAttributeIterator<Entry<String, V>>
    {
        @Override
        protected Entry<String, V> getValue(final String attributeName)
        {
            // Must create new Entry every time--value of the entry must stay
            // linked to the same attribute name
            return new EntrySetEntry(attributeName);
        }
    }

    private final class EntrySetEntry implements Entry<String, V>
    {
        private final String _currentKey;

        public EntrySetEntry(final String currentKey)
        {
            _currentKey = currentKey;
        }

        public String getKey()
        {
            return _currentKey;
        }

        public V getValue()
        {
            return AbstractThreadSafeAttributeMap.this.get(_currentKey);

                throw new ConverterException("Exception creating converter using binding", e);
            }
        }

        if ((_converterId != null) || (_converterIdString != null))
        {
            try
            {
                if (null != _converterIdString)
                {
                    converter = facesContext.getApplication().createConverter(_converterIdString);
                } else 
                {
                    String converterId = (String) _converterId.getValue(elContext);
                    converter = facesContext.getApplication().createConverter(converterId);
                }

                // with binding no converter was created, set its value with the converter
                // created using the converterId
                if (converter != null && _binding != null)
                {
                    _binding.setValue(elContext, converter);
                }
            }
            catch (Exception e)
            {
                throw new ConverterException("Exception creating converter with converterId: " + _converterId, e);