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79 lines
2.5 KiB
79 lines
2.5 KiB
/*-------------------------------------------------------------------------
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| rxtx is a native interface to serial ports in java.
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| Copyright 1997-2004 by Trent Jarvi taj@www.linux.org.uk
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| This library is free software; you can redistribute it and/or
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| modify it under the terms of the GNU Library General Public
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| License as published by the Free Software Foundation; either
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| version 2 of the License, or (at your option) any later version.
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| This library is distributed in the hope that it will be useful,
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| but WITHOUT ANY WARRANTY; without even the implied warranty of
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| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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| Library General Public License for more details.
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| You should have received a copy of the GNU Library General Public
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| License along with this library; if not, write to the Free
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| Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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--------------------------------------------------------------------------*/
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package gnu.io;
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import java.util.Enumeration;
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/**
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* @author Trent Jarvi
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* @version %I%, %G%
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* @since JDK1.0
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*/
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class CommPortEnumerator implements Enumeration
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{
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private CommPortIdentifier index;
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private final static boolean debug = false;
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static
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{
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if (debug)
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System.out.println("CommPortEnumerator:{}");
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}
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CommPortEnumerator()
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{
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}
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/*------------------------------------------------------------------------------
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nextElement()
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accept:
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perform:
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return:
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exceptions:
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comments:
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------------------------------------------------------------------------------*/
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public Object nextElement()
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{
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if(debug) System.out.println("CommPortEnumerator:nextElement()");
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synchronized (CommPortIdentifier.Sync)
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{
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if(index != null) index = index.next;
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else index=CommPortIdentifier.CommPortIndex;
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return(index);
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}
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}
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/*------------------------------------------------------------------------------
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hasMoreElements()
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accept:
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perform:
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return:
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exceptions:
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comments:
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------------------------------------------------------------------------------*/
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public boolean hasMoreElements()
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{
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if(debug) System.out.println("CommPortEnumerator:hasMoreElements() " + CommPortIdentifier.CommPortIndex == null ? false : true );
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synchronized (CommPortIdentifier.Sync)
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{
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if(index != null) return index.next == null ? false : true;
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else return CommPortIdentifier.CommPortIndex == null ?
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false : true;
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}
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}
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}
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