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Jython is an implementation of the high-level, dynamic, object-oriented language Python written in 100% Pure Java, and seamlessly integrated with the Java platform. It thus allows you to run Python on any Java platform.

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// Copyright 2000 Samuele Pedroni

package org.python.core;

import java.lang.ref.Reference;
import java.lang.ref.ReferenceQueue;
import java.lang.ref.SoftReference;

public class SoftIInternalTables extends AutoInternalTables {

    private static class Ref extends SoftReference {
        Object key;

        short type;

        Ref(short type, Object key, Object obj, ReferenceQueue queue) {
            super(obj, queue);
            this.type = type;
            this.key = key;
        }
    }

    protected Reference newAutoRef(short type, Object key, Object obj) {
        return new Ref(type, key, obj, this.queue);
    }

    protected short getAutoRefType(Reference ref) {
        return ((Ref) ref).type;
    }

    protected Object getAutoRefKey(Reference ref) {
        return ((Ref) ref).key;
    }

}