pjs/grendel/calypso/util/CharToByteConverterEnumerat...

89 строки
2.1 KiB
Java

/* -*- Mode: Java; tab-width: 2; indent-tabs-mode: nil -*-
*
* The contents of this file are subject to the Mozilla Public
* License Version 1.1 (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.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS
* IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
* implied. See the License for the specific language governing
* rights and limitations under the License.
*
* The Original Code is the Grendel mail/news client.
*
* The Initial Developer of the Original Code is Netscape Communications
* Corporation. Portions created by Netscape are
* Copyright (C) 1997 Netscape Communications Corporation. All
* Rights Reserved.
*
* Contributor(s):
*
* Created: Frank Tang <ftang@netscape.com>
*/
package calypso.util;
import java.util.Enumeration;
import sun.io.CharToByteConverter;
/*
* CharToByteConverterEnumeration return a Enumeration of String
* which represent available CharToByteConverter in the class path
*
* @author ftang
* @version $Revision: 1.2 $
* @see
*
*/
public class CharToByteConverterEnumeration extends PrefetchEnumeration {
Enumeration fDelegate;
/*
*
* @author ftang
* @version $Revision: 1.2 $
* @see
*
*/
public CharToByteConverterEnumeration()
{
fDelegate = new ClasspathEntryEnumeration("sun.io", "CharToByte", ".class");
}
/*
*
* @author ftang
* @version $Revision: 1.2 $
* @see
*
*/
protected boolean verify(Object obj)
{
try {
CharToByteConverter bc = CharToByteConverter.getConverter((String)obj);
return true;
} catch (Exception e)
{
return false;
}
}
/*
*
* @author ftang
* @version $Revision: 1.2 $
* @see
*
*/
protected Object fetch()
{
for(; fDelegate.hasMoreElements(); )
{
Object candidcate = fDelegate.nextElement();
if(verify(candidcate))
{
return candidcate;
}
}
return null;
}
}