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Diffstat (limited to 'dsa/FireBase/Offline/OfflineDatabase.cs')
| -rw-r--r-- | dsa/FireBase/Offline/OfflineDatabase.cs | 228 |
1 files changed, 228 insertions, 0 deletions
diff --git a/dsa/FireBase/Offline/OfflineDatabase.cs b/dsa/FireBase/Offline/OfflineDatabase.cs new file mode 100644 index 0000000..be0380b --- /dev/null +++ b/dsa/FireBase/Offline/OfflineDatabase.cs @@ -0,0 +1,228 @@ +using System; +using System.Collections; +using System.Collections.Generic; +using System.IO; +using System.Linq; +using LiteDB; + +namespace Firebase.Database.Offline +{ + /// <summary> + /// The offline database. + /// </summary> + public class OfflineDatabase : IDictionary<string, OfflineEntry> + { + private readonly IDictionary<string, OfflineEntry> cache; + private readonly LiteRepository db; + + /// <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 = GetFileName(itemType.ToString()); + if (fullName.Length > 100) fullName = fullName.Substring(0, 100); + + var mapper = BsonMapper.Global; + mapper.Entity<OfflineEntry>().Id(o => o.Key); + + var root = Environment.GetFolderPath(Environment.SpecialFolder.LocalApplicationData); + var filename = fullName + filenameModifier + ".db"; + var path = Path.Combine(root, filename); + db = new LiteRepository(new LiteDatabase(path, mapper)); + + 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 => cache.Count; + + /// <summary> + /// Gets a value indicating whether this is a read-only collection. + /// </summary> + public bool IsReadOnly => 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 => 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 => 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 => cache[key]; + + set + { + cache[key] = value; + 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 cache.GetEnumerator(); + } + + IEnumerator IEnumerable.GetEnumerator() + { + return 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) + { + Add(item.Key, item.Value); + } + + /// <summary> + /// Removes all items from the <see cref="T:System.Collections.Generic.ICollection`1" />. + /// </summary> + public void Clear() + { + cache.Clear(); + db.Delete<OfflineEntry>(LiteDB.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 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) + { + 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 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 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) + { + cache.Add(key, value); + 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) + { + cache.Remove(key); + return 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 cache.TryGetValue(key, out value); + } + + private string GetFileName(string fileName) + { + var invalidChars = new[] {'`', '[', ',', '='}; + foreach (var c in invalidChars.Concat(Path.GetInvalidFileNameChars()).Distinct()) + fileName = fileName.Replace(c, '_'); + + return fileName; + } + } +}
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