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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) 2013, 2022, 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
 * derivative works of, display, perform, and distribute the Software and make,
 * use, sell, offer for sale, import, export, have made, and have sold the
 * 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
 * portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */
package com.oracle.truffle.api.source;

import java.io.File;
import java.io.IOException;
import java.lang.ref.WeakReference;
import java.net.URI;
import java.net.URL;
import java.nio.charset.Charset;
import java.util.Set;
import java.util.function.Function;

import com.oracle.truffle.api.TruffleFile;
import com.oracle.truffle.api.impl.Accessor;
import com.oracle.truffle.api.source.Source.SourceBuilder;

final class SourceAccessor extends Accessor {

    static final SourceAccessor ACCESSOR = new SourceAccessor();

    static final LanguageSupport LANGUAGE = ACCESSOR.languageSupport();

    private SourceAccessor() {
    }

    public static void load() {
    }

    static String detectMimeType(TruffleFile file, Set validMimeTypes) {
        return ACCESSOR.languageSupport().detectMimeType(file, validMimeTypes);
    }

    static Charset detectEncoding(TruffleFile file, String mimeType) {
        return ACCESSOR.languageSupport().detectEncoding(file, mimeType);
    }

    static TruffleFile getTruffleFile(URI uri, Object fileSystemContext) {
        return ACCESSOR.languageSupport().getTruffleFile(fileSystemContext, uri);
    }

    static TruffleFile getTruffleFile(String path, Object fileSystemContext) {
        return ACCESSOR.languageSupport().getTruffleFile(path, fileSystemContext);
    }

    static boolean hasAllAccess(Object fileSystemContext) {
        return ACCESSOR.languageSupport().hasAllAccess(fileSystemContext);
    }

    static void onSourceCreated(Source source) {
        ACCESSOR.engineSupport().onSourceCreated(source);
    }

    static String getReinitializedPath(TruffleFile truffleFile) {
        return ACCESSOR.engineSupport().getReinitializedPath(truffleFile);
    }

    static URI getReinitializedURI(TruffleFile truffleFile) {
        return ACCESSOR.engineSupport().getReinitializedURI(truffleFile);
    }

    static final class SourceSupportImpl extends Accessor.SourceSupport {

        @Override
        public Source copySource(Source source) {
            Source copy = source.copy();
            copy.cachedPolyglotSource = source.cachedPolyglotSource;
            return copy;
        }

        @Override
        public Object getSourceIdentifier(Source source) {
            return source.getSourceId();
        }

        @Override
        public org.graalvm.polyglot.Source getOrCreatePolyglotSource(Source source,
                        Function createSource) {
            WeakReference ref = source.cachedPolyglotSource;
            org.graalvm.polyglot.Source polyglotSource;
            if (ref == null) {
                polyglotSource = null;
            } else {
                polyglotSource = ref.get();
            }
            if (polyglotSource == null) {
                polyglotSource = createSource.apply(source);
                source.cachedPolyglotSource = new WeakReference<>(polyglotSource);
            }
            assert polyglotSource != null;
            return polyglotSource;
        }

        @Override
        public String findMimeType(URL url, Object fileSystemContext) throws IOException {
            return Source.findMimeType(url, url.openConnection(), null, fileSystemContext);
        }

        @Override
        public SourceBuilder newBuilder(String language, File origin) {
            return Source.newBuilder(language, origin);
        }

        @Override
        public void setFileSystemContext(SourceBuilder builder, Object fileSystemContext) {
            builder.fileSystemContext(fileSystemContext);
        }

        @Override
        public void setEmbedderSource(SourceBuilder builder, boolean enabled) {
            builder.embedderSource(enabled);
        }

        @Override
        public void setURL(SourceBuilder builder, URL url) {
            builder.url(url);
        }

        @Override
        public void setPath(SourceBuilder builder, String path) {
            builder.path(path);
        }

        @Override
        public void invalidateAfterPreinitialiation(Source source) {
            ((SourceImpl) source).key.invalidateAfterPreinitialiation();
        }

        @Override
        public void mergeLoadedSources(Source[] sources) {
            for (Source s : sources) {
                if (s instanceof SourceImpl) {
                    Source.SOURCES.add(((SourceImpl) s));
                }
            }
        }
    }
}