43 lines
1.7 KiB
C#
43 lines
1.7 KiB
C#
using System;
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using System.Linq;
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using System.Collections.Generic;
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using Avalonia;
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using BFR.DataModels;
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namespace BFR.Operations
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{
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public abstract class Operation : AvaloniaObject
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{
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// Needs to be avalonia property to update UI with any potential error.
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private readonly AvaloniaProperty<string> errorProperty = AvaloniaProperty.Register<MainWindow, string>(nameof(Error), defaultValue: "");
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public string Error { get => GetValue(errorProperty); set => SetValue(errorProperty, value); }
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public bool IsEnabled { get; set; } = true;
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public abstract string Name { get; }
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public abstract string Description { get; }
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protected abstract void ApplyToInternal(IList<FileModel> files);
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public void ApplyTo(IList<FileModel> files)
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{
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// Backup of all changes thus far, in case something goes wrong
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var backup = files.Select(file => file.Path).ToList();
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try
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{
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if(IsEnabled)
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ApplyToInternal(files); // Try to apply operation
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Error = ""; // If successul, remove any previous error
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}
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catch (OperationException e) { Error = e.Message; } // If expected, show user a concise and descriptive message
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catch (Exception e) { Error = $"Unexpected {e}"; } // If not, hint with the exception thrown that this is unexpected behaviour
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finally
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{
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if (Error != "") // If something went wrong, restore backup
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for (int i = 0; i < files.Count; i++)
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files[i].Path = backup[i];
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}
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}
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}
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}
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