// Copyright 2000-2005 the Contributors, as shown in the revision logs.
// Licensed under the GNU General Public License version 2 ("the License").
// You may not use this file except in compliance with the License.

package org.ibex.plat;

import org.ibex.util.*;
import java.io.*;
import java.security.*;
import java.security.cert.*;
import org.ibex.graphics.*;
import org.ibex.core.*;
import org.ibex.net.*;

/** common superclass for all platforms that use GCJ to compile a native binary */
public abstract class GCJ extends Platform {

    protected native InputStream _getBuiltinInputStream();

    protected native void _decodeJPEG(InputStream is, Picture p);

    // FEATURE: This could be optimized (a lot) by using a custom hashtable
    public final static class Retainer {
        private static Hash table = new Hash();
        private final static class Key {
            private Object o;
            public Key(Object o) { this.o = o; }
            public int hashCode() { return o == null ? 0 : o.hashCode(); }
            public boolean equals(Object o2) { return (o2 instanceof Key) && ((Key)o2).o == o; }
        }
        private final static class Entry {
            private int refCount;
            public Entry() { inc(); }
            public void inc() { refCount++; }
            public boolean dec() { return --refCount == 0; }
        }
        public static synchronized void retain(Object o) {
            Key k = new Key(o);
            Entry r = (Entry) table.get(k);
            if(r == null) table.put(k,new Entry());
            else r.inc();
        }
        public static synchronized void release(Object o) {
            Key k = new Key(o);
            Entry e = (Entry) table.get(k);
            if(e == null) throw new Error("Retainer::Release on unknown object");
            if(e.dec()) { table.remove(k); }
        }
    }
}