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Truffle is a multi-language framework for executing dynamic languages that achieves high performance when combined with Graal.
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/*
 * Copyright (c) 2018, 2020, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * The Universal Permissive License (UPL), Version 1.0
 *
 * Subject to the condition set forth below, permission is hereby granted to any
 * person obtaining a copy of this software, associated documentation and/or
 * data (collectively the "Software"), free of charge and under any and all
 * copyright rights in the Software, and any and all patent rights owned or
 * freely licensable by each licensor hereunder covering either (i) the
 * unmodified Software as contributed to or provided by such licensor, or (ii)
 * the Larger Works (as defined below), to deal in both
 *
 * (a) the Software, and
 *
 * (b) any piece of software and/or hardware listed in the lrgrwrks.txt file if
 * one is included with the Software each a "Larger Work" to which the Software
 * is contributed by such licensors),
 *
 * without restriction, including without limitation the rights to copy, create
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 * Software and the Larger Work(s), and to sublicense the foregoing rights on
 * either these or other terms.
 *
 * This license is subject to the following condition:
 *
 * The above copyright notice and either this complete permission notice or at a
 * minimum a reference to the UPL must be included in all copies or substantial
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 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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 */
package com.oracle.truffle.polyglot;

import java.util.Map;
import java.util.Set;

import org.graalvm.polyglot.TypeLiteral;
import org.graalvm.polyglot.Value;

/**
 * A special implementation for polyglot bindings, exposed to the embedder. The difference to a
 * normal polyglot value is that it preserves the language information for each member.
 */
final class PolyglotBindingsValue extends PolyglotValueDispatch {

    final Value delegateBindings;
    final Map values;

    PolyglotBindingsValue(PolyglotLanguageContext context, PolyglotBindings bindings) {
        super(context.getImpl(), context.context.engine);
        this.values = context.context.polyglotBindings;
        this.delegateBindings = context.asValue(bindings);
    }

    @Override
    public Value getMember(Object context, Object receiver, String key) {
        return values.get(key);
    }

    @Override
    public Set getMemberKeys(Object context, Object receiver) {
        return values.keySet();
    }

    @Override
    public boolean removeMember(Object context, Object receiver, String key) {
        Value result = values.remove(key);
        return result != null;
    }

    @Override
    public void putMember(Object context, Object receiver, String key, Object member) {
        values.put(key, ((PolyglotLanguageContext) context).context.asValue(member));
    }

    @Override
    public boolean hasMembers(Object context, Object receiver) {
        return true;
    }

    @Override
    public boolean hasMember(Object context, Object receiver, String key) {
        return values.containsKey(key);
    }

    /*
     * It would be very hard to implement the #as(Class) semantics again here. So we just delegate
     * to an interop value in such a case. This also means that we loose language information for
     * members.
     */
    @Override
    public  T as(Object context, Object receiver, Class targetType) {
        return delegateBindings.as(targetType);
    }

    @Override
    public  T as(Object context, Object receiver, TypeLiteral targetType) {
        return delegateBindings.as(targetType);
    }

    @Override
    public String toStringImpl(Object context, Object receiver) {
        return delegateBindings.toString();
    }

    @Override
    public Value getMetaObjectImpl(PolyglotLanguageContext context, Object receiver) {
        return delegateBindings.getMetaObject();
    }
}