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RouteValueDictionary.cs
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RouteValueDictionary.cs
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// Copyright (c) .NET Foundation. All rights reserved.
// Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
using System;
using System.Collections;
using System.Collections.Concurrent;
using System.Collections.Generic;
using System.Diagnostics;
using Microsoft.AspNetCore.Routing.Abstractions;
using Microsoft.Extensions.Internal;
namespace Microsoft.AspNetCore.Routing
{
/// <summary>
/// An <see cref="IDictionary{String, Object}"/> type for route values.
/// </summary>
public class RouteValueDictionary : IDictionary<string, object>, IReadOnlyDictionary<string, object>
{
internal Storage _storage;
/// <summary>
/// Creates an empty <see cref="RouteValueDictionary"/>.
/// </summary>
public RouteValueDictionary()
{
_storage = EmptyStorage.Instance;
}
/// <summary>
/// Creates a <see cref="RouteValueDictionary"/> initialized with the specified <paramref name="values"/>.
/// </summary>
/// <param name="values">An object to initialize the dictionary. The value can be of type
/// <see cref="IDictionary{TKey, TValue}"/> or <see cref="IReadOnlyDictionary{TKey, TValue}"/>
/// or an object with public properties as key-value pairs.
/// </param>
/// <remarks>
/// If the value is a dictionary or other <see cref="IEnumerable{T}"/> of <see cref="KeyValuePair{String, Object}"/>,
/// then its entries are copied. Otherwise the object is interpreted as a set of key-value pairs where the
/// property names are keys, and property values are the values, and copied into the dictionary.
/// Only public instance non-index properties are considered.
/// </remarks>
public RouteValueDictionary(object values)
{
var dictionary = values as RouteValueDictionary;
if (dictionary != null)
{
var listStorage = dictionary._storage as ListStorage;
if (listStorage != null)
{
_storage = new ListStorage(listStorage);
return;
}
var propertyStorage = dictionary._storage as PropertyStorage;
if (propertyStorage != null)
{
// PropertyStorage is immutable so we can just copy it.
_storage = dictionary._storage;
return;
}
// If we get here, it's an EmptyStorage.
_storage = EmptyStorage.Instance;
return;
}
var keyValueEnumerable = values as IEnumerable<KeyValuePair<string, object>>;
if (keyValueEnumerable != null)
{
var listStorage = new ListStorage();
_storage = listStorage;
foreach (var kvp in keyValueEnumerable)
{
if (listStorage.ContainsKey(kvp.Key))
{
var message = Resources.FormatRouteValueDictionary_DuplicateKey(kvp.Key, nameof(RouteValueDictionary));
throw new ArgumentException(message, nameof(values));
}
listStorage.Add(kvp);
}
return;
}
var stringValueEnumerable = values as IEnumerable<KeyValuePair<string, string>>;
if (stringValueEnumerable != null)
{
var listStorage = new ListStorage();
_storage = listStorage;
foreach (var kvp in stringValueEnumerable)
{
if (listStorage.ContainsKey(kvp.Key))
{
var message = Resources.FormatRouteValueDictionary_DuplicateKey(kvp.Key, nameof(RouteValueDictionary));
throw new ArgumentException(message, nameof(values));
}
listStorage.Add(new KeyValuePair<string, object>(kvp.Key, kvp.Value));
}
return;
}
if (values != null)
{
_storage = new PropertyStorage(values);
return;
}
_storage = EmptyStorage.Instance;
}
/// <inheritdoc />
public object this[string key]
{
get
{
if (string.IsNullOrEmpty(key))
{
throw new ArgumentNullException(nameof(key));
}
object value;
TryGetValue(key, out value);
return value;
}
set
{
if (string.IsNullOrEmpty(key))
{
throw new ArgumentNullException(nameof(key));
}
if (!_storage.TrySetValue(key, value))
{
Upgrade();
_storage.TrySetValue(key, value);
}
}
}
/// <summary>
/// Gets the comparer for this dictionary.
/// </summary>
/// <remarks>
/// This will always be a reference to <see cref="StringComparer.OrdinalIgnoreCase"/>
/// </remarks>
public IEqualityComparer<string> Comparer => StringComparer.OrdinalIgnoreCase;
/// <inheritdoc />
public int Count => _storage.Count;
/// <inheritdoc />
bool ICollection<KeyValuePair<string, object>>.IsReadOnly => false;
/// <inheritdoc />
public ICollection<string> Keys
{
get
{
Upgrade();
var list = (ListStorage)_storage;
var keys = new string[list.Count];
for (var i = 0; i < keys.Length; i++)
{
keys[i] = list[i].Key;
}
return keys;
}
}
IEnumerable<string> IReadOnlyDictionary<string, object>.Keys
{
get
{
return Keys;
}
}
/// <inheritdoc />
public ICollection<object> Values
{
get
{
Upgrade();
var list = (ListStorage)_storage;
var values = new object[list.Count];
for (var i = 0; i < values.Length; i++)
{
values[i] = list[i].Value;
}
return values;
}
}
IEnumerable<object> IReadOnlyDictionary<string, object>.Values
{
get
{
return Values;
}
}
/// <inheritdoc />
void ICollection<KeyValuePair<string, object>>.Add(KeyValuePair<string, object> item)
{
Add(item.Key, item.Value);
}
/// <inheritdoc />
public void Add(string key, object value)
{
if (key == null)
{
throw new ArgumentNullException(nameof(key));
}
Upgrade();
var list = (ListStorage)_storage;
for (var i = 0; i < list.Count; i++)
{
if (string.Equals(list[i].Key, key, StringComparison.OrdinalIgnoreCase))
{
var message = Resources.FormatRouteValueDictionary_DuplicateKey(key, nameof(RouteValueDictionary));
throw new ArgumentException(message, nameof(key));
}
}
list.Add(new KeyValuePair<string, object>(key, value));
}
/// <inheritdoc />
public void Clear()
{
if (_storage.Count == 0)
{
return;
}
Upgrade();
var list = (ListStorage)_storage;
list.Clear();
}
/// <inheritdoc />
bool ICollection<KeyValuePair<string, object>>.Contains(KeyValuePair<string, object> item)
{
if (_storage.Count == 0)
{
return false;
}
Upgrade();
var list = (ListStorage)_storage;
for (var i = 0; i < list.Count; i++)
{
if (string.Equals(list[i].Key, item.Key, StringComparison.OrdinalIgnoreCase))
{
return EqualityComparer<object>.Default.Equals(list[i].Value, item.Value);
}
}
return false;
}
/// <inheritdoc />
public bool ContainsKey(string key)
{
if (key == null)
{
throw new ArgumentNullException(nameof(key));
}
return _storage.ContainsKey(key);
}
/// <inheritdoc />
void ICollection<KeyValuePair<string, object>>.CopyTo(
KeyValuePair<string, object>[] array,
int arrayIndex)
{
if (array == null)
{
throw new ArgumentNullException(nameof(array));
}
if (arrayIndex < 0 || arrayIndex > array.Length || array.Length - arrayIndex < this.Count)
{
throw new ArgumentOutOfRangeException(nameof(arrayIndex));
}
if (_storage.Count == 0)
{
return;
}
Upgrade();
var list = (ListStorage)_storage;
list.CopyTo(array, arrayIndex);
}
/// <inheritdoc />
public Enumerator GetEnumerator()
{
return new Enumerator(this);
}
/// <inheritdoc />
IEnumerator<KeyValuePair<string, object>> IEnumerable<KeyValuePair<string, object>>.GetEnumerator()
{
return GetEnumerator();
}
/// <inheritdoc />
IEnumerator IEnumerable.GetEnumerator()
{
return GetEnumerator();
}
/// <inheritdoc />
bool ICollection<KeyValuePair<string, object>>.Remove(KeyValuePair<string, object> item)
{
if (_storage.Count == 0)
{
return false;
}
Upgrade();
var list = (ListStorage)_storage;
for (var i = 0; i < list.Count; i++)
{
if (string.Equals(list[i].Key, item.Key, StringComparison.OrdinalIgnoreCase) &&
EqualityComparer<object>.Default.Equals(list[i].Value, item.Value))
{
list.RemoveAt(i);
return true;
}
}
return false;
}
/// <inheritdoc />
public bool Remove(string key)
{
if (key == null)
{
throw new ArgumentNullException(nameof(key));
}
if (_storage.Count == 0)
{
return false;
}
Upgrade();
var list = (ListStorage)_storage;
for (var i = 0; i < list.Count; i++)
{
if (string.Equals(list[i].Key, key, StringComparison.OrdinalIgnoreCase))
{
list.RemoveAt(i);
return true;
}
}
return false;
}
/// <inheritdoc />
public bool TryGetValue(string key, out object value)
{
if (key == null)
{
throw new ArgumentNullException(nameof(key));
}
return _storage.TryGetValue(key, out value);
}
private void Upgrade()
{
_storage.Upgrade(ref _storage);
}
public struct Enumerator : IEnumerator<KeyValuePair<string, object>>
{
private readonly Storage _storage;
private int _index;
public Enumerator(RouteValueDictionary dictionary)
{
if (dictionary == null)
{
throw new ArgumentNullException();
}
_storage = dictionary._storage;
Current = default(KeyValuePair<string, object>);
_index = -1;
}
public KeyValuePair<string, object> Current { get; private set; }
object IEnumerator.Current => Current;
public void Dispose()
{
}
public bool MoveNext()
{
if (++_index < _storage.Count)
{
Current = _storage[_index];
return true;
}
Current = default(KeyValuePair<string, object>);
return false;
}
public void Reset()
{
Current = default(KeyValuePair<string, object>);
_index = -1;
}
}
// Storage and its subclasses are internal for testing.
internal abstract class Storage
{
public abstract int Count { get; }
public abstract KeyValuePair<string, object> this[int index] { get; set; }
public abstract void Upgrade(ref Storage storage);
public abstract bool TryGetValue(string key, out object value);
public abstract bool ContainsKey(string key);
public abstract bool TrySetValue(string key, object value);
}
internal class ListStorage : Storage
{
private KeyValuePair<string, object>[] _items;
private int _count;
private static readonly KeyValuePair<string, object>[] _emptyArray = new KeyValuePair<string, object>[0];
public ListStorage()
{
_items = _emptyArray;
}
public ListStorage(int capacity)
{
if (capacity == 0)
{
_items = _emptyArray;
}
else
{
_items = new KeyValuePair<string, object>[capacity];
}
}
public ListStorage(ListStorage other)
{
if (other.Count == 0)
{
_items = _emptyArray;
}
else
{
_items = new KeyValuePair<string, object>[other.Count];
for (var i = 0; i < other.Count; i++)
{
this.Add(other[i]);
}
}
}
public int Capacity => _items.Length;
public override int Count => _count;
public override KeyValuePair<string, object> this[int index]
{
get
{
if (index < 0 || index >= _count)
{
throw new ArgumentOutOfRangeException(nameof(index));
}
return _items[index];
}
set
{
if (index < 0 || index >= _count)
{
throw new ArgumentOutOfRangeException(nameof(index));
}
_items[index] = value;
}
}
public void Add(KeyValuePair<string, object> item)
{
if (_count == _items.Length)
{
EnsureCapacity(_count + 1);
}
_items[_count++] = item;
}
public void RemoveAt(int index)
{
_count--;
for (var i = index; i < _count; i++)
{
_items[i] = _items[i + 1];
}
_items[_count] = default(KeyValuePair<string, object>);
}
public void Clear()
{
for (var i = 0; i < _count; i++)
{
_items[i] = default(KeyValuePair<string, object>);
}
_count = 0;
}
public void CopyTo(KeyValuePair<string, object>[] array, int arrayIndex)
{
for (var i = 0; i < _count; i++)
{
array[arrayIndex++] = _items[i];
}
}
public override bool ContainsKey(string key)
{
for (var i = 0; i < Count; i++)
{
var kvp = _items[i];
if (string.Equals(key, kvp.Key, StringComparison.OrdinalIgnoreCase))
{
return true;
}
}
return false;
}
public override bool TrySetValue(string key, object value)
{
for (var i = 0; i < Count; i++)
{
var kvp = _items[i];
if (string.Equals(key, kvp.Key, StringComparison.OrdinalIgnoreCase))
{
_items[i] = new KeyValuePair<string, object>(key, value);
return true;
}
}
Add(new KeyValuePair<string, object>(key, value));
return true;
}
public override bool TryGetValue(string key, out object value)
{
for (var i = 0; i < Count; i++)
{
var kvp = _items[i];
if (string.Equals(key, kvp.Key, StringComparison.OrdinalIgnoreCase))
{
value = kvp.Value;
return true;
}
}
value = null;
return false;
}
public override void Upgrade(ref Storage storage)
{
// Do nothing.
}
private void EnsureCapacity(int min)
{
var newLength = _items.Length == 0 ? 4 : _items.Length * 2;
var newItems = new KeyValuePair<string, object>[newLength];
for (var i = 0; i < _count; i++)
{
newItems[i] = _items[i];
}
_items = newItems;
}
}
internal class PropertyStorage : Storage
{
private static readonly PropertyCache _propertyCache = new PropertyCache();
internal readonly object _value;
internal readonly PropertyHelper[] _properties;
public PropertyStorage(object value)
{
Debug.Assert(value != null);
_value = value;
// Cache the properties so we can know if we've already validated them for duplicates.
var type = _value.GetType();
if (!_propertyCache.TryGetValue(type, out _properties))
{
_properties = PropertyHelper.GetVisibleProperties(type);
ValidatePropertyNames(type, _properties);
_propertyCache.TryAdd(type, _properties);
}
}
public PropertyStorage(PropertyStorage propertyStorage)
{
_value = propertyStorage._value;
_properties = propertyStorage._properties;
}
public override int Count => _properties.Length;
public override KeyValuePair<string, object> this[int index]
{
get
{
var property = _properties[index];
return new KeyValuePair<string, object>(property.Name, property.GetValue(_value));
}
set
{
// PropertyStorage never sets a value.
throw new NotImplementedException();
}
}
public override bool TryGetValue(string key, out object value)
{
for (var i = 0; i < _properties.Length; i++)
{
var property = _properties[i];
if (string.Equals(key, property.Name, StringComparison.OrdinalIgnoreCase))
{
value = property.GetValue(_value);
return true;
}
}
value = null;
return false;
}
public override bool ContainsKey(string key)
{
for (var i = 0; i < _properties.Length; i++)
{
var property = _properties[i];
if (string.Equals(key, property.Name, StringComparison.OrdinalIgnoreCase))
{
return true;
}
}
return false;
}
public override bool TrySetValue(string key, object value)
{
// PropertyStorage never sets a value.
return false;
}
public override void Upgrade(ref Storage storage)
{
storage = new ListStorage(Count);
for (var i = 0; i < _properties.Length; i++)
{
var property = _properties[i];
storage.TrySetValue(property.Name, property.GetValue(_value));
}
}
private static void ValidatePropertyNames(Type type, PropertyHelper[] properties)
{
var names = new Dictionary<string, PropertyHelper>(StringComparer.OrdinalIgnoreCase);
for (var i = 0; i < properties.Length; i++)
{
var property = properties[i];
PropertyHelper duplicate;
if (names.TryGetValue(property.Name, out duplicate))
{
var message = Resources.FormatRouteValueDictionary_DuplicatePropertyName(
type.FullName,
property.Name,
duplicate.Name,
nameof(RouteValueDictionary));
throw new InvalidOperationException(message);
}
names.Add(property.Name, property);
}
}
}
internal class EmptyStorage : Storage
{
public static readonly EmptyStorage Instance = new EmptyStorage();
private EmptyStorage()
{
}
public override int Count => 0;
public override KeyValuePair<string, object> this[int index]
{
get
{
throw new NotImplementedException();
}
set
{
throw new NotImplementedException();
}
}
public override bool ContainsKey(string key)
{
return false;
}
public override bool TryGetValue(string key, out object value)
{
value = null;
return false;
}
public override bool TrySetValue(string key, object value)
{
return false;
}
public override void Upgrade(ref Storage storage)
{
storage = new ListStorage();
}
}
private class PropertyCache : ConcurrentDictionary<Type, PropertyHelper[]>
{
}
}
}