using System; using System.Collections; using System.Collections.Generic; namespace Castle.Components.DictionaryAdapter { public class MemberwiseEqualityHashCodeStrategy : DictionaryBehaviorAttribute, IDictionaryEqualityHashCodeStrategy, IDictionaryInitializer, IDictionaryBehavior, IEqualityComparer<IDictionaryAdapter> { private class HashCodeVisitor : AbstractDictionaryAdapterVisitor { private int hashCode; public int CalculateHashCode(IDictionaryAdapter dictionaryAdapter) { if (dictionaryAdapter == null) return 0; hashCode = 27; if (!VisitDictionaryAdapter(dictionaryAdapter, null)) return 0; return hashCode; } protected override void VisitProperty(IDictionaryAdapter dictionaryAdapter, PropertyDescriptor property, object state) { object property2 = dictionaryAdapter.GetProperty(property.PropertyName, true); CollectHashCode(property, GetValueHashCode(property2)); } protected override void VisitInterface(IDictionaryAdapter dictionaryAdapter, PropertyDescriptor property, object state) { IDictionaryAdapter nested = (IDictionaryAdapter)dictionaryAdapter.GetProperty(property.PropertyName, true); CollectHashCode(property, GetNestedHashCode(nested)); } protected override void VisitCollection(IDictionaryAdapter dictionaryAdapter, PropertyDescriptor property, Type collectionItemType, object state) { IEnumerable collection = (IEnumerable)dictionaryAdapter.GetProperty(property.PropertyName, true); CollectHashCode(property, GetCollectionHashcode(collection)); } private int GetValueHashCode(object value) { if (value == null) return 0; if (value is IDictionaryAdapter) return GetNestedHashCode((IDictionaryAdapter)value); if (value is IEnumerable && !(value is string)) return GetCollectionHashcode((IEnumerable)value); return value.GetHashCode(); } private int GetNestedHashCode(IDictionaryAdapter nested) { int num = hashCode; int result = CalculateHashCode(nested); hashCode = num; return result; } private int GetCollectionHashcode(IEnumerable collection) { if (collection == null) return 0; int num = 0; foreach (object item in collection) { int valueHashCode = GetValueHashCode(item); num = 13 * num + valueHashCode; } return num; } private void CollectHashCode(PropertyDescriptor property, int valueHashCode) { hashCode = 13 * hashCode + property.PropertyName.GetHashCode(); hashCode = 13 * hashCode + valueHashCode; } } public bool Equals(IDictionaryAdapter adapter1, IDictionaryAdapter adapter2) { if (object.ReferenceEquals(adapter1, adapter2)) return true; if ((adapter1 == null) ^ (adapter2 == null)) return false; if (adapter1.Meta.Type != adapter2.Meta.Type) return false; return GetHashCode(adapter1) == GetHashCode(adapter2); } public int GetHashCode(IDictionaryAdapter adapter) { GetHashCode(adapter, out int hashCode); return hashCode; } public bool GetHashCode(IDictionaryAdapter adapter, out int hashCode) { hashCode = new HashCodeVisitor().CalculateHashCode(adapter); return true; } void IDictionaryInitializer.Initialize(IDictionaryAdapter dictionaryAdapter, object[] behaviors) { dictionaryAdapter.This.EqualityHashCodeStrategy = this; } } }