package textbender.g.hold; // Copyright 2005-2006, Michael Allan.  Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Textbender Software"), to deal in the Textbender Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicence, and/or sell copies of the Textbender Software, and to permit persons to whom the Textbender Software is furnished to do so, subject to the following conditions: The preceding copyright notice and this permission notice shall be included in all copies or substantial portions of the Textbender Software. THE TEXTBENDER SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE TEXTBENDER SOFTWARE OR THE USE OR OTHER DEALINGS IN THE TEXTBENDER SOFTWARE.

import java.util.*;
//import textbender.g.util.logging.LoggerX;
import textbender.g.lang.Catcher;


/** Basic implementation of a spool.
  */
public class Spool1 extends LinkedList<Hold> implements Spool
{


   // - C o l l e c t i o n --------------------------------------------------------------


    public boolean add( Hold hold )
    {
        if( isUnwinding )
        {
            hold.release();
            return false;
        }
        if( !super.add( hold )) throw new IllegalStateException();
        return true;
    }



    public boolean addAll( int index, Collection<? extends Hold> c ) { throw new UnsupportedOperationException(); } // no need



   // - L i n k e d - L i s t ------------------------------------------------------------


    public void addFirst( Hold hold ) { throw new UnsupportedOperationException(); } // no need

    public void addLast( Hold hold ) { throw new UnsupportedOperationException(); } // no need



   // - Q u e u e ------------------------------------------------------------------------


    public boolean offer( Hold hold ) { throw new UnsupportedOperationException(); } // no need



   // - S p o o l ------------------------------------------------------------------------


    public boolean isUnwinding() { return isUnwinding; }


        private boolean isUnwinding;



    public boolean unwind() { return unwind( catcher0 ); }



    public boolean unwind( Catcher<Hold> catcher )
    {
        if( isUnwinding ) return false;

        if( catcher == null ) throw new NullPointerException();

        isUnwinding = true;
        while( !isEmpty() )
        {
            Hold hold = removeLast();
            try{ hold.release(); }
            catch( Error r ) { catcher.catchError( hold, r ); }
            catch( Exception x ) { catcher.catchException( hold, x ); }
        }
        return true;
    }



}