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fix for duplicate instances in joins, removed validation around TOP w…
…ithout ORDER BY
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Dapper.FastCRUD/SqlStatements/RelationshipEntityInstanceIdentity.cs
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,146 @@ | ||
| namespace Dapper.FastCrud.SqlStatements | ||
| { | ||
| using System.Linq; | ||
| using Dapper.FastCrud.Mappings; | ||
|
|
||
| /// <summary> | ||
| /// Typed entity identity used by the entity builder. | ||
| /// </summary> | ||
| internal class RelationshipEntityInstanceIdentity<TEntity> : RelationshipEntityInstanceIdentity | ||
| { | ||
| public RelationshipEntityInstanceIdentity(EntityMapping entityMapping, TEntity instance) | ||
| : base(entityMapping, instance) | ||
| { | ||
| this.TypedInstance = instance; | ||
| } | ||
|
|
||
| /// <summary> | ||
| /// Gets the instance attached to the current identity. | ||
| /// </summary> | ||
| public TEntity TypedInstance { get; } | ||
| } | ||
|
|
||
| /// <summary> | ||
| /// Entity identity used by the entity builder. | ||
| /// </summary> | ||
| internal class RelationshipEntityInstanceIdentity | ||
| { | ||
| private readonly object[] _keyPropertyValues; | ||
| private int _hashCode; | ||
|
|
||
| /// <summary> | ||
| /// Default constructor. | ||
| /// </summary> | ||
| public RelationshipEntityInstanceIdentity(EntityMapping entityMapping, object entity) | ||
| { | ||
| this.EntityMapping = entityMapping; | ||
| this.Instance = entity; | ||
| this.UniqueInstance = entity; | ||
|
|
||
| if (entity != null) | ||
| { | ||
| _keyPropertyValues = entityMapping.PropertyMappings.Values.Where(propMapping => propMapping.IsPrimaryKey).Select( | ||
| propMapping => | ||
| { | ||
| var propDescriptor = propMapping.Descriptor; | ||
| var propValue = propDescriptor.GetValue(entity); | ||
|
|
||
| // assumes that all values for the entity keys provide proper hash keys | ||
| // 'rotating hash' is fast due to the use of bit operation, provides a good distribution and doesn't cause overflows | ||
| // http://eternallyconfuzzled.com/tuts/algorithms/jsw_tut_hashing.aspx | ||
| _hashCode = (_hashCode << 4) ^ (_hashCode >> 28) ^ (propValue?.GetHashCode() ?? 0); | ||
| return propValue; | ||
| }).ToArray(); | ||
| } | ||
| } | ||
|
|
||
| /// <summary> | ||
| /// Gets the entity mapping of the instance attached to this identity. | ||
| /// </summary> | ||
| public EntityMapping EntityMapping { get; } | ||
|
|
||
| /// <summary> | ||
| /// Gets or sets a flag indicating that the instance attached to this identity is a duplicate and should be ignored. | ||
| /// </summary> | ||
| public bool IsDuplicate { get; private set; } | ||
|
|
||
| /// <summary> | ||
| /// Gets or sets the unique instance different than the current instance in case <see cref="IsDuplicate"/> is set to true. | ||
| /// </summary> | ||
| public object UniqueInstance { get; private set; } | ||
|
|
||
| /// <summary> | ||
| /// Gets the untyped instance attached to the current identity. | ||
| /// </summary> | ||
| public object Instance { get; } | ||
|
|
||
| /// <summary> | ||
| /// Sets a unique instance in cse the current instance attached to the identity is a duplicate. | ||
| /// </summary> | ||
| public void SetDuplicate(object uniqueInstance) | ||
| { | ||
| this.UniqueInstance = uniqueInstance; | ||
| this.IsDuplicate = true; | ||
| } | ||
|
|
||
| /// <summary>Determines whether the specified object is equal to the current object.</summary> | ||
| /// <returns>true if the specified object is equal to the current object; otherwise, false.</returns> | ||
| /// <param name="other">The object to compare with the current object. </param> | ||
| public override bool Equals(object other) | ||
| { | ||
| if (ReferenceEquals(null, other)) | ||
| { | ||
| return false; | ||
| } | ||
| if (ReferenceEquals(this, other)) | ||
| { | ||
| return true; | ||
| } | ||
|
|
||
| var otherIdentity = other as RelationshipEntityInstanceIdentity; | ||
| if (ReferenceEquals(otherIdentity, null)) | ||
| { | ||
| return false; | ||
| } | ||
| return Equals(otherIdentity); | ||
| } | ||
|
|
||
| /// <summary>Serves as the default hash function. </summary> | ||
| /// <returns>A hash code for the current object.</returns> | ||
| public override int GetHashCode() | ||
| { | ||
| return _hashCode; | ||
| } | ||
|
|
||
| public static bool operator ==(RelationshipEntityInstanceIdentity left, RelationshipEntityInstanceIdentity right) | ||
| { | ||
| return Equals(left, right); | ||
| } | ||
|
|
||
| public static bool operator !=(RelationshipEntityInstanceIdentity left, RelationshipEntityInstanceIdentity right) | ||
| { | ||
| return !Equals(left, right); | ||
| } | ||
|
|
||
| protected bool Equals(RelationshipEntityInstanceIdentity other) | ||
| { | ||
| if (_keyPropertyValues.Length != other._keyPropertyValues.Length) | ||
| { | ||
| return false; | ||
| } | ||
|
|
||
| for (var keyValueIndex = 0; keyValueIndex < _keyPropertyValues.Length; keyValueIndex++) | ||
| { | ||
| var currentKeyValue = _keyPropertyValues[keyValueIndex]; | ||
| var otherKeyValue = other._keyPropertyValues[keyValueIndex]; | ||
|
|
||
| if (!object.Equals(currentKeyValue, otherKeyValue)) | ||
| { | ||
| return false; | ||
| } | ||
| } | ||
|
|
||
| return true; | ||
| } | ||
| } | ||
| } |
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