org.armedbear.lisp.JHandler Maven / Gradle / Ivy

Go to download
Show more of this group Show more artifacts with this name
Show all versions of abcl Show documentation
Common Lisp implementation running on the JVM
There is a newer version: 1.9.2
/*
 * JHandler.java
 *
 * Copyright (C) 2003-2005 Andras Simon, Peter Graves
 * $Id$
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 *
 * This program 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
 *
 * As a special exception, the copyright holders of this library give you
 * permission to link this library with independent modules to produce an
 * executable, regardless of the license terms of these independent
 * modules, and to copy and distribute the resulting executable under
 * terms of your choice, provided that you also meet, for each linked
 * independent module, the terms and conditions of the license of that
 * module.  An independent module is a module which is not derived from
 * or based on this library.  If you modify this library, you may extend
 * this exception to your version of the library, but you are not
 * obligated to do so.  If you do not wish to do so, delete this
 * exception statement from your version.
 */

package org.armedbear.lisp;

import static org.armedbear.lisp.Lisp.*;

import java.util.HashMap;
import java.util.Map;
import java.util.WeakHashMap;

public final class JHandler
{
    static final Map> table =
       new WeakHashMap>();

    public static void callLisp (String s, Object o)
    {
        callLisp(s, o, "");
    }

    public static void callLisp (String s, Object o, String s1)
    {
        callLisp(s, o, s1, new int[] {});
    }

    public static void callLisp (String s, Object o, String s1, int ai[]) {
        callLisp(s, o, new String[] { s1 }, ai);
    }

    public static void callLisp (String s, Object o, String as[])
    {
        callLisp(s, o, as, new int[] {});
    }

    public static void callLisp (String s, Object o, String as[], int ai[])
    {
        if (table.containsKey(o)) {
            Map entryTable = table.get(o);
            if (entryTable.containsKey(s)) {
                final Entry entry = entryTable.get(s);
                final Function f = entry.getHandler();
                final LispObject data = entry.getData();
                final Fixnum count = entry.getCount();
                final Fixnum[] lispAi = new Fixnum[ai.length];
                for (int i = 0; i < ai.length; i++) {
                    lispAi[i] = Fixnum.getInstance(ai[i]);
                }
                final LispObject lispAiVector = new SimpleVector(lispAi);
                final SimpleString[] lispAs = new SimpleString[as.length];
                for (int i = 0; i < as.length; i++) {
                    lispAs[i] = new SimpleString(as[i]);
                }
                final LispObject lispAsVector = new SimpleVector(lispAs);
                LispObject[] args =
                    new LispObject[] //FIXME: count -> seq_num
                    { data,
                      new JavaObject(o),
                      lispAiVector,
                      lispAsVector,
                      internKeyword(s),
                      count };
                f.execute(args);
            }
        }
    }

    // jregister-handler1 object event handler data count
    private static final Primitive _JREGISTER_HANDLER =
        new Primitive("%jregister-handler", PACKAGE_JAVA)
    {
        @Override
        public LispObject execute(LispObject[] args)
        {
            if (args.length != 5)
                return error(new WrongNumberOfArgumentsException(this, 5));
            Map entryTable = null;
            Object object = args[0].javaInstance();
            String event = ((Symbol)args[1]).getName();
            if (!table.containsKey(object)) {
                entryTable = new HashMap();
                table.put(object,entryTable);
            } else {
                entryTable = (Map)table.get(object);
            }
            Entry entry = new Entry((Function) args[2], args[3], event, entryTable);
            if (args[4] != NIL)
                entry.addCount(((Fixnum)args[4]).value);
            entryTable.put(event,entry);
            return T;
        }
    };

    private static class Entry
    {
        Function handler;
        LispObject data;
        int count = -1;
        Map entryTable;
        String event;

        public Entry (Function handler, LispObject data, String event,
                      Map entryTable)
        {
            this.entryTable = entryTable;
            this.event = event;
            this.handler = handler;
            this.data = data;
        }

        public Function getHandler ()
        {
            return handler;
        }

        public void addData (LispObject data)
        {
            this.data = data;
        }

        public LispObject getData ()
        {
            return data;
        }

        public void addCount (int count)
        {
            this.count = count;
        }

        public Fixnum getCount ()
        {
            if (count == 0)
                entryTable.remove(event);
            return (Fixnum.getInstance (count--));
        }
    }
}