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Jason is a fully-fledged interpreter for an extended version of AgentSpeak, a BDI agent-oriented logic programming language.

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//----------------------------------------------------------------------------
// Copyright (C) 2003  Rafael H. Bordini, Jomi F. Hubner, et al.
// 
// This library is free software; you can redistribute it and/or
// modify it under the terms of the GNU Lesser General Public
// License as published by the Free Software Foundation; either
// version 2.1 of the License, or (at your option) any later version.
// 
// This library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
// Lesser General Public License for more details.
// 
// You should have received a copy of the GNU Lesser General Public
// License along with this library; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
// 
// To contact the authors:
// http://www.inf.ufrgs.br/~bordini
// http://www.das.ufsc.br/~jomi
//
//----------------------------------------------------------------------------


package jason.stdlib;

import java.util.Iterator;

import jason.asSemantics.Circumstance;
import jason.asSemantics.DefaultInternalAction;
import jason.asSemantics.Event;
import jason.asSemantics.TransitionSystem;
import jason.asSemantics.Unifier;
import jason.asSyntax.Term;

/**

  Internal action: .drop_all_intentions.
  
  
Description: removes all intentions from the agent's set of
  intentions (even suspended intentions are removed). 
  No event is produced.

  
This action changes the agent's circumstance structure by simply
  emptying the whole set of intentions (I), pending actions (PA),
  pending intentions (PI), and events in E that are not external
  events (thus generated by intentions).

  
Example:
 

   .drop_all_intentions.

  

  @see jason.stdlib.intend
  @see jason.stdlib.desire
  @see jason.stdlib.drop_all_desires
  @see jason.stdlib.drop_all_events
  @see jason.stdlib.drop_intention
  @see jason.stdlib.drop_desire
  @see jason.stdlib.succeed_goal
  @see jason.stdlib.fail_goal
  @see jason.stdlib.current_intention
  @see jason.stdlib.suspend
  @see jason.stdlib.suspended
  @see jason.stdlib.resume

 */
public class drop_all_intentions extends DefaultInternalAction {

    @Override public int getMinArgs() { return 0; }
    @Override public int getMaxArgs() { return 0; }

    @Override
    public Object execute(TransitionSystem ts, Unifier un, Term[] args) throws Exception {
        checkArguments(args);
        
        Circumstance C = ts.getC();
        C.clearIntentions();
        C.clearPendingIntentions();
        C.clearPendingActions();

        // drop intentions in E
        Iterator ie = C.getEventsPlusAtomic();
        while (ie.hasNext()) {
            Event e = ie.next();
            if (e.isInternal()) {
                C.removeEvent(e);
            }
        }

        // drop intentions in PE
        for (String ek: C.getPendingEvents().keySet()) {
            Event e = C.getPendingEvents().get(ek);
            if (e.isInternal()) {
                C.removePendingEvent(ek);
            }
        }

        // cancel future events generated by .at
        at atia = (at)ts.getAg().getIA(at.atAtom);
        atia.cancelAts();
        
        return true;
    }
}