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using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Collections.ObjectModel;
using System.IO;
namespace Tango.Core.IO
{
/// <summary>
/// Represents a temporary item base class.
/// </summary>
/// <seealso cref="Tango.Core.IO.ITemporaryItem" />
public abstract class TemporaryItem : ITemporaryItem
{
/// <summary>
/// Occurs when this item has been deleted.
/// </summary>
public event EventHandler Deleted;
/// <summary>
/// Gets the creation date of the temporary item.
/// </summary>
public DateTime Date { get; protected set; }
/// <summary>
/// Gets the path to the temporary item.
/// </summary>
public string Path { get; protected set; }
/// <summary>
/// Gets the optional item tag.
/// </summary>
public Object Tag { get; protected set; }
/// <summary>
/// Gets or sets a value indicating whether this <see cref="ITemporaryItem" /> should not be deleted by a parent item.
/// </summary>
public bool Persist { get; set; }
/// <summary>
/// Gets the collection of child items.
/// </summary>
public IReadOnlyCollection<ITemporaryItem> Items { get; private set; }
/// <summary>
/// Initializes a new instance of the <see cref="TemporaryItem"/> class.
/// </summary>
/// <param name="path">The temporary item path.</param>
/// <param name="tag">The item tag.</param>
public TemporaryItem(String path, Object tag)
{
Items = new ReadOnlyCollection<ITemporaryItem>(new List<ITemporaryItem>());
Date = DateTime.Now;
Path = path;
Tag = tag;
}
/// <summary>
/// Initializes a new instance of the <see cref="TemporaryItem"/> class.
/// </summary>
/// <param name="path">The temporary item path.</param>
public TemporaryItem(String path) : this(path, null)
{
}
/// <summary>
/// Adds a child item.
/// </summary>
/// <param name="item">The item.</param>
public ITemporaryItem AddItem(ITemporaryItem item)
{
item.Deleted += Item_Deleted;
var list = Items.ToList();
list.Add(item);
Items = list.ToReadOnlyCollection();
return item;
}
/// <summary>
/// Removes the specified child item.
/// </summary>
public void RemoveItem(ITemporaryItem item)
{
item.Deleted -= Item_Deleted;
var list = Items.ToList();
list.Remove(item);
Items = list.ToReadOnlyCollection();
}
/// <summary>
/// Handles the Deleted event of the child Item.
/// </summary>
/// <param name="sender">The source of the event.</param>
/// <param name="e">The <see cref="EventArgs"/> instance containing the event data.</param>
private void Item_Deleted(object sender, EventArgs e)
{
RemoveItem(sender as ITemporaryItem);
}
/// <summary>
/// Deletes the temporary item.
/// </summary>
/// <returns>
/// True is deletion was successful.
/// </returns>
public virtual bool Delete()
{
List<ITemporaryItem> remained = new List<ITemporaryItem>();
var items = Items;
foreach (var item in items.Where(x => !x.Persist))
{
if (!item.Delete())
{
remained.Add(item);
}
else
{
Deleted?.Invoke(this, new EventArgs());
}
}
Items = new ReadOnlyCollection<ITemporaryItem>(remained);
return remained.Count == 0;
}
/// <summary>
/// Returns true if the item exists.
/// </summary>
/// <returns></returns>
public abstract bool Exists();
/// <summary>
/// Deletes the temporary item asynchronously.
/// </summary>
/// <returns>
/// True is deletion was successful.
/// </returns>
public Task<bool> DeleteAsync()
{
return Task.Factory.StartNew<bool>(() => Delete());
}
/// <summary>
/// Makes the temporary item visible to the user somehow.
/// </summary>
public abstract void Display();
/// <summary>
/// Returns a <see cref="System.String" /> that represents this instance.
/// </summary>
/// <returns>
/// A <see cref="System.String" /> that represents this instance.
/// </returns>
public override string ToString()
{
return Path;
}
/// <summary>
/// Performs an explicit conversion from <see cref="TemporaryItem"/> to <see cref="String"/>.
/// </summary>
/// <param name="item">The item.</param>
/// <returns>
/// The result of the conversion.
/// </returns>
public static implicit operator String(TemporaryItem item)
{
return item.Path;
}
}
}
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