/src/LinFu.IoC/ServiceInfo.cs

  1using System;
  2using System.Collections.Generic;
  3using System.Linq;
  4using LinFu.IoC.Interfaces;
  5
  6namespace LinFu.IoC
  7{
  8    /// <summary>
  9    ///     Represents the default implementation of the ServiceInfo class.
 10    /// </summary>
 11    internal class ServiceInfo : IServiceInfo
 12    {
 13        /// <summary>
 14        ///     Initializes the class with the given <paramref name="serviceName" />
 15        ///     and <paramref name="serviceType" />.
 16        /// </summary>
 17        /// <param name="serviceName">The name of the service.</param>
 18        /// <param name="serviceType">The type of service that can be created.</param>
 19        public ServiceInfo(string serviceName, Type serviceType)
 20        {
 21            ServiceType = serviceType;
 22            ServiceName = serviceName;
 23            ArgumentTypes = new Type[0];
 24        }
 25
 26        /// <summary>
 27        ///     Initializes the class with the given <paramref name="serviceName" />
 28        ///     and <paramref name="serviceType" />.
 29        /// </summary>
 30        /// <param name="serviceName">The name of the service.</param>
 31        /// <param name="serviceType">The type of service that can be created.</param>
 32        /// <param name="arguments">The parameter types required by the given service.</param>
 33        public ServiceInfo(string serviceName, Type serviceType, IEnumerable<Type> arguments)
 34        {
 35            ServiceType = serviceType;
 36            ServiceName = serviceName;
 37            ArgumentTypes = arguments;
 38        }
 39
 40
 41        /// <summary>
 42        ///     The name of the service being created. By default, this property is blank.
 43        /// </summary>
 44        public string ServiceName { get; }
 45
 46        /// <summary>
 47        ///     The type of service being requested.
 48        /// </summary>
 49        public Type ServiceType { get; }
 50
 51        /// <summary>
 52        ///     Gets a value indicating the list of arguments required by this particular service.
 53        /// </summary>
 54        public IEnumerable<Type> ArgumentTypes { get; }
 55
 56
 57        /// <summary>
 58        ///     Displays the name of the current service and the current service type.
 59        /// </summary>
 60        /// <returns>The name of the current service and the current service type.</returns>
 61        public override string ToString()
 62        {
 63            return string.Format("Service Name: '{0}', Service Type = '{1}'", ServiceName,
 64                ServiceType.AssemblyQualifiedName);
 65        }
 66
 67        /// <summary>
 68        ///     Determines if the other object is equal to the current <see cref="IServiceInfo" /> instance.
 69        /// </summary>
 70        /// <param name="obj">The other object that will be used in the comparison.</param>
 71        /// <returns>
 72        ///     Returns <c>true</c> if both instances have the same service name, implement the same service type and have the
 73        ///     same arguments; otherwise, it will return <c>false</c>.
 74        /// </returns>
 75        public override bool Equals(object obj)
 76        {
 77            if (!(obj is IServiceInfo))
 78                return false;
 79
 80            var other = (IServiceInfo) obj;
 81            return GetHashCode() == other.GetHashCode();
 82        }
 83
 84        public override int GetHashCode()
 85        {
 86            var hash = 0;
 87
 88            // Hash the service name
 89            if (!string.IsNullOrEmpty(ServiceName))
 90                hash = ServiceName.GetHashCode();
 91
 92            // Hash the service type
 93            hash ^= ServiceType.GetHashCode();
 94
 95            // Hash the arguments
 96            foreach (var argType in ArgumentTypes)
 97            {
 98                if (argType == null)
 99                    continue;
100
101                hash ^= argType.GetHashCode();
102            }
103
104            // Hash the number of arguments
105            var argCount = ArgumentTypes == null ? 0 : ArgumentTypes.Count();
106            if (argCount > 0)
107                hash ^= argCount.GetHashCode();
108
109            return hash;
110        }
111    }
112}