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//--------------------------------------------------------------------------
//	Copyright (c) 1998-2004, Drew Davidson and Luke Blanshard
//  All rights reserved.
//
//	Redistribution and use in source and binary forms, with or without
//  modification, are permitted provided that the following conditions are
//  met:
//
//	Redistributions of source code must retain the above copyright notice,
//  this list of conditions and the following disclaimer.
//	Redistributions in binary form must reproduce the above copyright
//  notice, this list of conditions and the following disclaimer in the
//  documentation and/or other materials provided with the distribution.
//	Neither the name of the Drew Davidson nor the names of its contributors
//  may be used to endorse or promote products derived from this software
//  without specific prior written permission.
//
//	THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
//  "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
//  LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
//  FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
//  COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
//  INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
//  BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
//  OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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//  OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
//  THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
//  DAMAGE.
//--------------------------------------------------------------------------
package ognl;

import java.util.*;

/**
 * Implementation of PropertyAccessor that provides "property" reference to
 * "nextElement" (aliases to "next" also) and "hasMoreElements" (also aliased
 * to "hasNext").
 * @author Luke Blanshard ([email protected])
 * @author Drew Davidson ([email protected])
 */
public class EnumerationPropertyAccessor extends ObjectPropertyAccessor
    implements PropertyAccessor // This is here to make javadoc show this class as an implementor
{
    public Object getProperty( Map context, Object target, Object name ) throws OgnlException
    {
        Object      result;
        Enumeration e = (Enumeration)target;

        if ( name instanceof String ) {
            if (name.equals("next") || name.equals("nextElement")) {
                result = e.nextElement();
            } else {
                if (name.equals("hasNext") || name.equals("hasMoreElements")) {
                    result = e.hasMoreElements() ? Boolean.TRUE : Boolean.FALSE;
                } else {
                    result = super.getProperty( context, target, name );
                }
            }
        } else {
            result = super.getProperty(context, target, name);
        }
        return result;
    }

    public void setProperty( Map context, Object target, Object name, Object value ) throws OgnlException
    {
        throw new IllegalArgumentException( "can't set property " + name + " on Enumeration" );
    }
}