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namespace Firebase.Database.Offline
{
using System;
using System.Collections;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using LiteDB;
/// <summary>
/// The offline database.
/// </summary>
public class OfflineDatabase : IDictionary<string, OfflineEntry>
{
private readonly LiteRepository db;
private readonly IDictionary<string, OfflineEntry> cache;
/// <summary>
/// Initializes a new instance of the <see cref="OfflineDatabase"/> class.
/// </summary>
/// <param name="itemType"> The item type which is used to determine the database file name. </param>
/// <param name="filenameModifier"> Custom string which will get appended to the file name. </param>
public OfflineDatabase(Type itemType, string filenameModifier)
{
var fullName = this.GetFileName(itemType.ToString());
if(fullName.Length > 100)
{
fullName = fullName.Substring(0, 100);
}
BsonMapper mapper = BsonMapper.Global;
mapper.Entity<OfflineEntry>().Id(o => o.Key);
string root = Environment.GetFolderPath(Environment.SpecialFolder.LocalApplicationData);
string filename = fullName + filenameModifier + ".db";
var path = Path.Combine(root, filename);
this.db = new LiteRepository(new LiteDatabase(path, mapper));
this.cache = db.Database.GetCollection<OfflineEntry>().FindAll()
.ToDictionary(o => o.Key, o => o);
}
/// <summary>
/// Gets the number of elements contained in the <see cref="T:System.Collections.Generic.ICollection`1"/>.
/// </summary>
/// <returns> The number of elements contained in the <see cref="T:System.Collections.Generic.ICollection`1"/>. </returns>
public int Count => this.cache.Count;
/// <summary>
/// Gets a value indicating whether this is a read-only collection.
/// </summary>
public bool IsReadOnly => this.cache.IsReadOnly;
/// <summary>
/// Gets an <see cref="T:System.Collections.Generic.ICollection`1"/> containing the keys of the <see cref="T:System.Collections.Generic.IDictionary`2"/>.
/// </summary>
/// <returns> An <see cref="T:System.Collections.Generic.ICollection`1"/> containing the keys of the object that implements <see cref="T:System.Collections.Generic.IDictionary`2"/>. </returns>
public ICollection<string> Keys => this.cache.Keys;
/// <summary>
/// Gets an <see cref="T:System.Collections.Generic.ICollection`1"/> containing the values in the <see cref="T:System.Collections.Generic.IDictionary`2"/>.
/// </summary>
/// <returns> An <see cref="T:System.Collections.Generic.ICollection`1"/> containing the values in the object that implements <see cref="T:System.Collections.Generic.IDictionary`2"/>. </returns>
public ICollection<OfflineEntry> Values => this.cache.Values;
/// <summary>
/// Gets or sets the element with the specified key.
/// </summary>
/// <param name="key">The key of the element to get or set.</param>
/// <returns> The element with the specified key. </returns>
public OfflineEntry this[string key]
{
get
{
return this.cache[key];
}
set
{
this.cache[key] = value;
this.db.Upsert(value);
}
}
/// <summary>
/// Returns an enumerator that iterates through the collection.
/// </summary>
/// <returns> An enumerator that can be used to iterate through the collection. </returns>
public IEnumerator<KeyValuePair<string, OfflineEntry>> GetEnumerator()
{
return this.cache.GetEnumerator();
}
IEnumerator IEnumerable.GetEnumerator()
{
return this.GetEnumerator();
}
/// <summary>
/// Adds an item to the <see cref="T:System.Collections.Generic.ICollection`1"/>.
/// </summary>
/// <param name="item">The object to add to the <see cref="T:System.Collections.Generic.ICollection`1"/>.</param>
public void Add(KeyValuePair<string, OfflineEntry> item)
{
this.Add(item.Key, item.Value);
}
/// <summary>
/// Removes all items from the <see cref="T:System.Collections.Generic.ICollection`1"/>.
/// </summary>
public void Clear()
{
this.cache.Clear();
this.db.Delete<OfflineEntry>(Query.All());
}
/// <summary>
/// Determines whether the <see cref="T:System.Collections.Generic.ICollection`1"/> contains a specific value.
/// </summary>
/// <param name="item">The object to locate in the <see cref="T:System.Collections.Generic.ICollection`1"/>.</param>
/// <returns> True if <paramref name="item"/> is found in the <see cref="T:System.Collections.Generic.ICollection`1"/>; otherwise, false. </returns>
public bool Contains(KeyValuePair<string, OfflineEntry> item)
{
return this.ContainsKey(item.Key);
}
/// <summary>
/// Copies the elements of the <see cref="T:System.Collections.Generic.ICollection`1"/> to an <see cref="T:System.Array"/>, starting at a particular <see cref="T:System.Array"/> index.
/// </summary>
/// <param name="array">The one-dimensional <see cref="T:System.Array"/> that is the destination of the elements copied from <see cref="T:System.Collections.Generic.ICollection`1"/>. The <see cref="T:System.Array"/> must have zero-based indexing.</param>
/// <param name="arrayIndex">The zero-based index in <paramref name="array"/> at which copying begins.</param>
public void CopyTo(KeyValuePair<string, OfflineEntry>[] array, int arrayIndex)
{
this.cache.CopyTo(array, arrayIndex);
}
/// <summary>
/// Removes the first occurrence of a specific object from the <see cref="T:System.Collections.Generic.ICollection`1"/>.
/// </summary>
/// <param name="item">The object to remove from the <see cref="T:System.Collections.Generic.ICollection`1"/>.</param>
/// <returns> True if <paramref name="item"/> was successfully removed from the <see cref="T:System.Collections.Generic.ICollection`1"/>; otherwise, false. This method also returns false if <paramref name="item"/> is not found in the original <see cref="T:System.Collections.Generic.ICollection`1"/>. </returns>
public bool Remove(KeyValuePair<string, OfflineEntry> item)
{
return this.Remove(item.Key);
}
/// <summary>
/// Determines whether the <see cref="T:System.Collections.Generic.IDictionary`2"/> contains an element with the specified key.
/// </summary>
/// <param name="key">The key to locate in the <see cref="T:System.Collections.Generic.IDictionary`2"/>.</param>
/// <returns> True if the <see cref="T:System.Collections.Generic.IDictionary`2"/> contains an element with the key; otherwise, false. </returns>
public bool ContainsKey(string key)
{
return this.cache.ContainsKey(key);
}
/// <summary>
/// Adds an element with the provided key and value to the <see cref="T:System.Collections.Generic.IDictionary`2"/>.
/// </summary>
/// <param name="key">The object to use as the key of the element to add.</param>
/// <param name="value">The object to use as the value of the element to add.</param>
public void Add(string key, OfflineEntry value)
{
this.cache.Add(key, value);
this.db.Insert(value);
}
/// <summary>
/// Removes the element with the specified key from the <see cref="T:System.Collections.Generic.IDictionary`2"/>.
/// </summary>
/// <param name="key">The key of the element to remove.</param>
/// <returns> True if the element is successfully removed; otherwise, false. This method also returns false if <paramref name="key"/> was not found in the original <see cref="T:System.Collections.Generic.IDictionary`2"/>. </returns>
public bool Remove(string key)
{
this.cache.Remove(key);
return this.db.Delete<OfflineEntry>(key);
}
/// <summary>
/// Gets the value associated with the specified key.
/// </summary>
/// <param name="key">The key whose value to get.</param><param name="value">When this method returns, the value associated with the specified key, if the key is found; otherwise, the default value for the type of the <paramref name="value"/> parameter. This parameter is passed uninitialized.</param>
/// <returns> True if the object that implements <see cref="T:System.Collections.Generic.IDictionary`2"/> contains an element with the specified key; otherwise, false. </returns>
public bool TryGetValue(string key, out OfflineEntry value)
{
return this.cache.TryGetValue(key, out value);
}
private string GetFileName(string fileName)
{
var invalidChars = new[] { '`', '[', ',', '=' };
foreach(char c in invalidChars.Concat(System.IO.Path.GetInvalidFileNameChars()).Distinct())
{
fileName = fileName.Replace(c, '_');
}
return fileName;
}
}
}
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