refactor(back): Fix #100 .

6 files changed, 225 insertions, 0 deletions

diff --git a/Timeline/Services/Exceptions/EntityAlreadyExistError.cs b/Timeline/Services/Exceptions/EntityAlreadyExistError.cs
new file mode 100644
index 00000000..7db2e860
--- /dev/null
+++ b/Timeline/Services/Exceptions/EntityAlreadyExistError.cs
@@ -0,0 +1,63 @@
+using System;

+using System.Globalization;

+using System.Text;

+

+namespace Timeline.Services.Exceptions

+{

+    /// <summary>

+    /// Thrown when an entity is already exists.

+    /// </summary>

+    /// <remarks>

+    /// For example, want to create a timeline but a timeline with the same name already exists.

+    /// </remarks>

+    [Serializable]

+    public class EntityAlreadyExistException : Exception

+    {

+        private readonly string? _entityName;

+

+        public EntityAlreadyExistException() : this(null, null, null, null) { }

+

+        public EntityAlreadyExistException(string? entityName) : this(entityName, null) { }

+

+        public EntityAlreadyExistException(string? entityName, Exception? inner) : this(entityName, null, null, null, inner) { }

+

+        public EntityAlreadyExistException(string? entityName, object? entity = null) : this(entityName, null, entity, null, null) { }

+        public EntityAlreadyExistException(Type? entityType, object? entity = null) : this(null, entityType, entity, null, null) { }

+        public EntityAlreadyExistException(string? entityName, Type? entityType, object? entity = null, string? message = null, Exception? inner = null) : base(MakeMessage(entityName, entityType, message), inner)

+        {

+            _entityName = entityName;

+            EntityType = entityType;

+            Entity = entity;

+        }

+

+        private static string MakeMessage(string? entityName, Type? entityType, string? message)

+        {

+            string? name = entityName ?? (entityType?.Name);

+

+            var result = new StringBuilder();

+

+            if (name == null)

+                result.Append(Resources.Services.Exceptions.EntityAlreadyExistErrorDefault);

+            else

+                result.AppendFormat(CultureInfo.InvariantCulture, Resources.Services.Exceptions.EntityAlreadyExistError, name);

+

+            if (message != null)

+            {

+                result.Append(' ');

+                result.Append(message);

+            }

+

+            return result.ToString();

+        }

+

+        protected EntityAlreadyExistException(

+          System.Runtime.Serialization.SerializationInfo info,

+          System.Runtime.Serialization.StreamingContext context) : base(info, context) { }

+

+        public string? EntityName => _entityName ?? (EntityType?.Name);

+

+        public Type? EntityType { get; }

+

+        public object? Entity { get; }

+    }

+}

diff --git a/Timeline/Services/Exceptions/EntityNotExistError.cs b/Timeline/Services/Exceptions/EntityNotExistError.cs
new file mode 100644
index 00000000..e79496d3
--- /dev/null
+++ b/Timeline/Services/Exceptions/EntityNotExistError.cs
@@ -0,0 +1,55 @@
+using System;

+using System.Globalization;

+using System.Text;

+

+namespace Timeline.Services.Exceptions

+{

+    /// <summary>

+    /// Thrown when you want to get an entity that does not exist.

+    /// </summary>

+    /// <example>

+    /// For example, you want to get a timeline with given name but it does not exist.

+    /// </example>

+    [Serializable]

+    public class EntityNotExistException : Exception

+    {

+        public EntityNotExistException() : this(null, null, null, null) { }

+        public EntityNotExistException(string? entityName) : this(entityName, null, null, null) { }

+        public EntityNotExistException(Type? entityType) : this(null, entityType, null, null) { }

+        public EntityNotExistException(string? entityName, Exception? inner) : this(entityName, null, null, inner) { }

+        public EntityNotExistException(Type? entityType, Exception? inner) : this(null, entityType, null, inner) { }

+        public EntityNotExistException(string? entityName, Type? entityType, string? message = null, Exception? inner = null) : base(MakeMessage(entityName, entityType, message), inner)

+        {

+            EntityName = entityName;

+            EntityType = entityType;

+        }

+

+        private static string MakeMessage(string? entityName, Type? entityType, string? message)

+        {

+            string? name = entityName ?? (entityType?.Name);

+

+            var result = new StringBuilder();

+

+            if (name == null)

+                result.Append(Resources.Services.Exceptions.EntityNotExistErrorDefault);

+            else

+                result.AppendFormat(CultureInfo.InvariantCulture, Resources.Services.Exceptions.EntityNotExistError, name);

+

+            if (message != null)

+            {

+                result.Append(' ');

+                result.Append(message);

+            }

+

+            return result.ToString();

+        }

+

+        protected EntityNotExistException(

+          System.Runtime.Serialization.SerializationInfo info,

+          System.Runtime.Serialization.StreamingContext context) : base(info, context) { }

+

+        public string? EntityName { get; }

+

+        public Type? EntityType { get; }

+    }

+}

diff --git a/Timeline/Services/Exceptions/ExceptionMessageHelper.cs b/Timeline/Services/Exceptions/ExceptionMessageHelper.cs
new file mode 100644
index 00000000..be3c42a4
--- /dev/null
+++ b/Timeline/Services/Exceptions/ExceptionMessageHelper.cs
@@ -0,0 +1,13 @@
+namespace Timeline.Services.Exceptions

+{

+    public static class ExceptionMessageHelper

+    {

+        public static string AppendAdditionalMessage(this string origin, string? message)

+        {

+            if (message == null)

+                return origin;

+            else

+                return origin + " " + message;

+        }

+    }

+}

diff --git a/Timeline/Services/Exceptions/TimelineNotExistException.cs b/Timeline/Services/Exceptions/TimelineNotExistException.cs
new file mode 100644
index 00000000..70970b24
--- /dev/null
+++ b/Timeline/Services/Exceptions/TimelineNotExistException.cs
@@ -0,0 +1,21 @@
+using System;

+using System.Globalization;

+

+namespace Timeline.Services.Exceptions

+{

+    [Serializable]

+    public class TimelineNotExistException : EntityNotExistException

+    {

+        public TimelineNotExistException() : this(null, null) { }

+        public TimelineNotExistException(string? timelineName) : this(timelineName, null) { }

+        public TimelineNotExistException(string? timelineName, Exception? inner) : this(timelineName, null, inner) { }

+        public TimelineNotExistException(string? timelineName, string? message, Exception? inner = null)

+            : base(EntityNames.Timeline, null, string.Format(CultureInfo.InvariantCulture, Resources.Services.Exceptions.TimelineNotExistException, timelineName ?? "").AppendAdditionalMessage(message), inner) { TimelineName = timelineName; }

+

+        protected TimelineNotExistException(

+          System.Runtime.Serialization.SerializationInfo info,

+          System.Runtime.Serialization.StreamingContext context) : base(info, context) { }

+

+        public string? TimelineName { get; set; }

+    }

+}

diff --git a/Timeline/Services/Exceptions/TimelinePostNotExistException.cs b/Timeline/Services/Exceptions/TimelinePostNotExistException.cs
new file mode 100644
index 00000000..bbb9e908
--- /dev/null
+++ b/Timeline/Services/Exceptions/TimelinePostNotExistException.cs
@@ -0,0 +1,33 @@
+using System;

+using System.Globalization;

+

+namespace Timeline.Services.Exceptions

+{

+    [Serializable]

+    public class TimelinePostNotExistException : EntityNotExistException

+    {

+        public TimelinePostNotExistException() { }

+        [Obsolete("This has no meaning.")]

+        public TimelinePostNotExistException(string? message) : this(message, null) { }

+        [Obsolete("This has no meaning.")]

+        public TimelinePostNotExistException(string? message, Exception? inner) : this(null, null, false, message, inner) { }

+        protected TimelinePostNotExistException(

+          System.Runtime.Serialization.SerializationInfo info,

+          System.Runtime.Serialization.StreamingContext context) : base(info, context) { }

+

+        public TimelinePostNotExistException(string? timelineName, long? id, bool isDelete, string? message = null, Exception? inner = null) : base(EntityNames.TimelinePost, null, MakeMessage(timelineName, id, isDelete).AppendAdditionalMessage(message), inner) { TimelineName = timelineName; Id = id; IsDelete = isDelete; }

+

+        private static string MakeMessage(string? timelineName, long? id, bool isDelete)

+        {

+            return string.Format(CultureInfo.InvariantCulture, isDelete ? Resources.Services.Exceptions.TimelinePostNotExistExceptionDeleted : Resources.Services.Exceptions.TimelinePostNotExistException, timelineName ?? "", id);

+        }

+

+        public string? TimelineName { get; set; }

+        public long? Id { get; set; }

+

+        /// <summary>

+        /// True if the post is deleted. False if the post does not exist at all.

+        /// </summary>

+        public bool IsDelete { get; set; }

+    }

+}

diff --git a/Timeline/Services/Exceptions/UserNotExistException.cs b/Timeline/Services/Exceptions/UserNotExistException.cs
new file mode 100644
index 00000000..7ef714df
--- /dev/null
+++ b/Timeline/Services/Exceptions/UserNotExistException.cs
@@ -0,0 +1,40 @@
+using System;

+using System.Globalization;

+

+namespace Timeline.Services.Exceptions

+{

+    /// <summary>

+    /// The user requested does not exist.

+    /// </summary>

+    [Serializable]

+    public class UserNotExistException : EntityNotExistException

+    {

+        public UserNotExistException() : this(null, null, null, null) { }

+        public UserNotExistException(string? username, Exception? inner) : this(username, null, null, inner) { }

+

+        public UserNotExistException(string? username) : this(username, null, null, null) { }

+

+        public UserNotExistException(long id) : this(null, id, null, null) { }

+

+        public UserNotExistException(string? username, long? id, string? message, Exception? inner) : base(EntityNames.User, null,

+            string.Format(CultureInfo.InvariantCulture, Resources.Services.Exceptions.UserNotExistException, username ?? "", id).AppendAdditionalMessage(message), inner)

+        {

+            Username = username;

+            Id = id;

+        }

+

+        protected UserNotExistException(

+          System.Runtime.Serialization.SerializationInfo info,

+          System.Runtime.Serialization.StreamingContext context) : base(info, context) { }

+

+        /// <summary>

+        /// The username of the user that does not exist.

+        /// </summary>

+        public string? Username { get; set; }

+

+        /// <summary>

+        /// The id of the user that does not exist.

+        /// </summary>

+        public long? Id { get; set; }

+    }

+}