[#23] Client: Refactoring to optimize memory usage

Signed-off-by: Pavel Gross <p.gross@yando.com>

src/FrostFS.SDK.ClientV2/Models/Object/FrostFsObjectHeader.cs

@@ -0,0 +1,85 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+
+using FrostFS.Object;
+
+using FrostFS.SDK.ClientV2.Mappers.GRPC;
+
+namespace FrostFS.SDK;
+
+public class FrostFsObjectHeader(
+    FrostFsContainerId containerId,
+    FrostFsObjectType type = FrostFsObjectType.Regular,
+    FrostFsAttribute[]? attributes = null,
+    FrostFsSplit? split = null,
+    FrostFsOwner? owner = null,
+    FrostFsVersion? version = null)
+{
+    private Header header;
+    private Container.Container.Types.Attribute[]? grpsAttributes;
+   
+    public List<FrostFsAttribute> Attributes { get; internal set; } = attributes != null ? [.. attributes] : [];
+
+    public FrostFsContainerId ContainerId { get; } = containerId;
+
+    public ulong PayloadLength { get; set; }
+
+    public byte[]? PayloadCheckSum { get; set; }
+
+    public FrostFsObjectType ObjectType { get; } = type;
+
+    public FrostFsOwner? OwnerId { get; internal set; } = owner;
+
+    public FrostFsVersion? Version { get; internal set; } = version;
+
+    public FrostFsSplit? Split { get; internal set; } = split;
+
+    internal Container.Container.Types.Attribute[]? GetGrpsAttributes()
+    {
+        grpsAttributes ??= Attributes?
+            .Select(a => new Container.Container.Types.Attribute { Key = a.Key, Value = a.Value })
+            .ToArray();
+
+        return grpsAttributes;
+    }
+
+    public Header GetHeader()
+    {
+        if (header == null)
+        {
+            var objTypeName = ObjectType switch
+            {
+                FrostFsObjectType.Regular => Object.ObjectType.Regular,
+                FrostFsObjectType.Lock => Object.ObjectType.Lock,
+                FrostFsObjectType.Tombstone => Object.ObjectType.Tombstone,
+                _ => throw new ArgumentException($"Unknown ObjectType. Value: '{ObjectType}'.")
+            };
+
+            this.header = new Header
+            {
+                OwnerId = OwnerId?.ToMessage(),
+                Version = Version?.ToMessage(),
+                ContainerId = ContainerId.ToMessage(),
+                ObjectType = objTypeName,
+                PayloadLength = PayloadLength
+            };
+
+            foreach (var attribute in Attributes)
+            {
+                this.header.Attributes.Add(attribute.ToMessage());
+            }
+
+            var split = Split;
+            if (split != null)
+            {
+                this.header.Split = new Header.Types.Split
+                {
+                    SplitId = split!.SplitId != null ? split.SplitId.GetSplitId() : null
+                };
+            }
+        }
+
+        return this.header;
+    }
+}