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// Licensed to the Apache Software Foundation (ASF) under one or more
// contributor license agreements. See the NOTICE file distributed with
// this work for additional information regarding copyright ownership.
// The ASF licenses this file to You under the Apache License, Version 2.0
// (the "License"); you may not use this file except in compliance with
// the License. You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
using System;
using System.Buffers;
using System.Runtime.CompilerServices;
using Apache.Arrow.Memory;
namespace Apache.Arrow
{
public readonly partial struct ArrowBuffer : IEquatable<ArrowBuffer>, IDisposable
{
private readonly IMemoryOwner<byte> _memoryOwner;
private readonly ReadOnlyMemory<byte> _memory;
public static ArrowBuffer Empty => new ArrowBuffer(Memory<byte>.Empty);
public ArrowBuffer(ReadOnlyMemory<byte> data)
{
_memoryOwner = null;
_memory = data;
}
internal ArrowBuffer(IMemoryOwner<byte> memoryOwner)
{
// When wrapping an IMemoryOwner, don't cache the Memory<byte>
// since the owner may be disposed, and the cached Memory would
// be invalid.
_memoryOwner = memoryOwner;
_memory = Memory<byte>.Empty;
}
public ReadOnlyMemory<byte> Memory =>
_memoryOwner != null ? _memoryOwner.Memory : _memory;
public bool IsEmpty => Memory.IsEmpty;
public int Length => Memory.Length;
public ReadOnlySpan<byte> Span
{
[MethodImpl(MethodImplOptions.AggressiveInlining)]
get => Memory.Span;
}
public ArrowBuffer Clone(MemoryAllocator allocator = default)
{
return new Builder<byte>(Span.Length)
.Append(Span)
.Build(allocator);
}
public bool Equals(ArrowBuffer other)
{
return Span.SequenceEqual(other.Span);
}
public void Dispose()
{
_memoryOwner?.Dispose();
}
}
}
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