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package com.oracle.truffle.trufflenode;

import com.oracle.truffle.api.object.DynamicObject;
import com.oracle.truffle.api.object.Shape;
import com.oracle.truffle.js.runtime.JSContext;
import com.oracle.truffle.js.runtime.builtins.JSNonProxy;

public final class JSExternal extends JSNonProxy {

    public static final String CLASS_NAME = "external";
    public static final JSExternal INSTANCE = new JSExternal();

    private JSExternal() {
    }

    public static DynamicObject create(JSContext context, long pointer) {
        ContextData contextData = GraalJSAccess.getContextEmbedderData(context);
        DynamicObject obj = new JSExternalObject(contextData.getExternalObjectShape(), pointer);
        assert isJSExternalObject(obj);
        return obj;
    }

    public static Shape makeInitialShape(JSContext ctx) {
        return ctx.makeEmptyShapeWithNullPrototype(INSTANCE);
    }

    public static boolean isJSExternalObject(Object obj) {
        return obj instanceof JSExternalObject;
    }

    @Override
    public String getClassName(DynamicObject object) {
        return CLASS_NAME;
    }
}