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 * The Universal Permissive License (UPL), Version 1.0
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 * person obtaining a copy of this software, associated documentation and/or
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 * the Larger Works (as defined below), to deal in both
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 * (a) the Software, and
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 * (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),
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 * 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.
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 * 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.
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package com.oracle.graal.python.builtins.objects.cext.capi;

import com.oracle.graal.python.builtins.objects.PNone;
import com.oracle.graal.python.builtins.objects.cext.capi.CExtNodes.ToSulongNode;
import com.oracle.graal.python.builtins.objects.type.PythonBuiltinClass;
import com.oracle.graal.python.nodes.SpecialMethodNames;
import com.oracle.graal.python.runtime.GilNode;
import com.oracle.truffle.api.dsl.Cached;
import com.oracle.truffle.api.dsl.Cached.Exclusive;
import com.oracle.truffle.api.dsl.ImportStatic;
import com.oracle.truffle.api.interop.InteropLibrary;
import com.oracle.truffle.api.interop.UnknownIdentifierException;
import com.oracle.truffle.api.interop.UnsupportedMessageException;
import com.oracle.truffle.api.library.CachedLibrary;
import com.oracle.truffle.api.library.ExportLibrary;
import com.oracle.truffle.api.library.ExportMessage;
import com.oracle.truffle.llvm.spi.NativeTypeLibrary;

@ExportLibrary(InteropLibrary.class)
@ExportLibrary(value = NativeTypeLibrary.class, useForAOT = false)
@ImportStatic(SpecialMethodNames.class)
public class PyBufferProcsWrapper extends PythonNativeWrapper {
    private static final String BF_GETBUFFER = "bf_getbuffer";
    private static final String BF_RELEASEBUFFER = "bf_releasebuffer";

    public PyBufferProcsWrapper(PythonBuiltinClass delegate) {
        super(delegate);
    }

    public PythonBuiltinClass getPythonClass(PythonNativeWrapperLibrary lib) {
        return (PythonBuiltinClass) lib.getDelegate(this);
    }

    @ExportMessage
    protected boolean hasMembers() {
        return true;
    }

    @ExportMessage
    protected boolean isMemberReadable(String member) {
        switch (member) {
            case BF_GETBUFFER:
            case BF_RELEASEBUFFER:
                return true;
            default:
                return false;
        }
    }

    @ExportMessage
    protected Object getMembers(@SuppressWarnings("unused") boolean includeInternal) throws UnsupportedMessageException {
        throw UnsupportedMessageException.create();
    }

    @ExportMessage
    protected Object readMember(String member,
                    @CachedLibrary("this") PythonNativeWrapperLibrary lib,
                    @Cached ToSulongNode toSulongNode,
                    @Exclusive @Cached GilNode gil) throws UnknownIdentifierException {
        boolean mustRelease = gil.acquire();
        try {
            // translate key to attribute name
            PythonClassNativeWrapper nativeWrapper = getPythonClass(lib).getClassNativeWrapper();
            // TODO handle case if nativeWrapper does not exist yet
            Object result;
            switch (member) {
                case BF_GETBUFFER:
                    result = nativeWrapper.getGetBufferProc();
                    break;
                case BF_RELEASEBUFFER:
                    // TODO
                    result = nativeWrapper.getReleaseBufferProc();
                    break;
                default:
                    // TODO extend list
                    throw UnknownIdentifierException.create(member);
            }
            // do not wrap result if exists since this is directly a native object
            // use NO_VALUE for NULL
            return result == null ? toSulongNode.execute(PNone.NO_VALUE) : result;
        } finally {
            gil.release(mustRelease);
        }
    }

    @ExportMessage
    @SuppressWarnings("static-method")
    protected boolean hasNativeType() {
        // TODO implement native type
        return false;
    }

    @ExportMessage
    @SuppressWarnings("static-method")
    public Object getNativeType() {
        // TODO implement native type
        return null;
    }
}
