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package com.oracle.graal.python.builtins.objects.bytes;

import com.oracle.graal.python.builtins.objects.buffer.PythonBufferAccessLibrary;
import com.oracle.graal.python.builtins.objects.buffer.PythonBufferAcquireLibrary;
import com.oracle.graal.python.runtime.sequence.PSequence;
import com.oracle.graal.python.runtime.sequence.storage.ByteSequenceStorage;
import com.oracle.graal.python.runtime.sequence.storage.NativeSequenceStorage;
import com.oracle.graal.python.runtime.sequence.storage.SequenceStorage;
import com.oracle.truffle.api.dsl.Cached.Shared;
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.api.object.Shape;

@ExportLibrary(PythonBufferAcquireLibrary.class)
@ExportLibrary(PythonBufferAccessLibrary.class)
public abstract class PBytesLike extends PSequence {

    protected SequenceStorage store;

    public PBytesLike(Object cls, Shape instanceShape, byte[] bytes) {
        super(cls, instanceShape);
        store = new ByteSequenceStorage(bytes);
    }

    public PBytesLike(Object cls, Shape instanceShape, SequenceStorage store) {
        super(cls, instanceShape);
        this.store = store;
    }

    @Override
    public final SequenceStorage getSequenceStorage() {
        return store;
    }

    @Override
    public void setSequenceStorage(SequenceStorage store) {
        assert store instanceof ByteSequenceStorage || store instanceof NativeSequenceStorage && isNativeByte((NativeSequenceStorage) store);
        this.store = store;
    }

    private static boolean isNativeByte(NativeSequenceStorage store) {
        return store.getElementType() == SequenceStorage.ListStorageType.Byte;
    }

    @ExportMessage
    @SuppressWarnings("static-method")
    boolean hasBuffer() {
        return true;
    }

    @ExportMessage
    Object acquire(@SuppressWarnings("unused") int flags) {
        return this;
    }

    @ExportMessage
    @SuppressWarnings("static-method")
    boolean isBuffer() {
        return true;
    }

    @ExportMessage
    int getBufferLength(
                    @Shared("bufferLib") @CachedLibrary(limit = "2") PythonBufferAccessLibrary bufferLib) {
        return bufferLib.getBufferLength(store);
    }

    @ExportMessage
    boolean hasInternalByteArray(
                    @Shared("bufferLib") @CachedLibrary(limit = "2") PythonBufferAccessLibrary bufferLib) {
        return bufferLib.hasInternalByteArray(store);
    }

    @ExportMessage
    byte[] getInternalByteArray(
                    @Shared("bufferLib") @CachedLibrary(limit = "2") PythonBufferAccessLibrary bufferLib) {
        return bufferLib.getInternalByteArray(store);
    }

    @ExportMessage
    byte readByte(int byteOffset,
                    @Shared("bufferLib") @CachedLibrary(limit = "2") PythonBufferAccessLibrary bufferLib) {
        return bufferLib.readByte(store, byteOffset);
    }

    @ExportMessage
    short readShort(int byteOffset,
                    @Shared("bufferLib") @CachedLibrary(limit = "2") PythonBufferAccessLibrary bufferLib) {
        return bufferLib.readShort(store, byteOffset);
    }

    @ExportMessage
    int readInt(int byteOffset,
                    @Shared("bufferLib") @CachedLibrary(limit = "2") PythonBufferAccessLibrary bufferLib) {
        return bufferLib.readInt(store, byteOffset);
    }

    @ExportMessage
    long readLong(int byteOffset,
                    @Shared("bufferLib") @CachedLibrary(limit = "2") PythonBufferAccessLibrary bufferLib) {
        return bufferLib.readLong(store, byteOffset);
    }

    @ExportMessage
    float readFloat(int byteOffset,
                    @Shared("bufferLib") @CachedLibrary(limit = "2") PythonBufferAccessLibrary bufferLib) {
        return bufferLib.readFloat(store, byteOffset);
    }

    @ExportMessage
    double readDouble(int byteOffset,
                    @Shared("bufferLib") @CachedLibrary(limit = "2") PythonBufferAccessLibrary bufferLib) {
        return bufferLib.readDouble(store, byteOffset);
    }
}
