431 lines
16 KiB
C#
431 lines
16 KiB
C#
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// ****************************************************************
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// This is free software licensed under the NUnit license. You
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// may obtain a copy of the license as well as information regarding
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// copyright ownership at http://nunit.org/?p=license&r=2.4.
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// ****************************************************************
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using System;
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using System.Reflection;
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using System.Collections;
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namespace NUnit.Core
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{
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/// <summary>
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/// Helper methods for inspecting a type by reflection.
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///
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/// Many of these methods take a MemberInfo as an argument to avoid
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/// duplication, even though certain attributes can only appear on
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/// specific types of members, like MethodInfo or Type.
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///
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/// In the case where a type is being examined for the presence of
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/// an attribute, interface or named member, the Reflect methods
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/// operate with the full name of the member being sought. This
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/// removes the necessity of the caller having a reference to the
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/// assembly that defines the item being sought and allows the
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/// NUnit core to inspect assemblies that reference an older
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/// version of the NUnit framework.
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/// </summary>
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public class Reflect
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{
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#region Attributes
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/// <summary>
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/// Check presence of attribute of a given type on a member.
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/// </summary>
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/// <param name="member">The member to examine</param>
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/// <param name="attrName">The FullName of the attribute type to look for</param>
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/// <param name="inherit">True to include inherited attributes</param>
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/// <returns>True if the attribute is present</returns>
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public static bool HasAttribute( MemberInfo member, string attrName, bool inherit )
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{
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object[] attributes = member.GetCustomAttributes( inherit );
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foreach( Attribute attribute in attributes )
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if ( IsInstanceOfType( attrName, attribute ) )
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return true;
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return false;
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}
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/// <summary>
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/// Get attribute of a given type on a member. If multiple attributes
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/// of a type are present, the first one found is returned.
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/// </summary>
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/// <param name="member">The member to examine</param>
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/// <param name="attrName">The FullName of the attribute type to look for</param>
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/// <param name="inherit">True to include inherited attributes</param>
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/// <returns>The attribute or null</returns>
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public static System.Attribute GetAttribute(MemberInfo member, string attrName, bool inherit)
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{
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object[] attributes = member.GetCustomAttributes(inherit);
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foreach (Attribute attribute in attributes)
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if ( IsInstanceOfType( attrName, attribute ) )
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return attribute;
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return null;
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}
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/// <summary>
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/// Get attribute of a given type on an assembly. If multiple attributes
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/// of a type are present, the first one found is returned.
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/// </summary>
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/// <param name="assembly">The assembly to examine</param>
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/// <param name="attrName">The FullName of the attribute type to look for</param>
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/// <param name="inherit">True to include inherited attributes</param>
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/// <returns>The attribute or null</returns>
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public static System.Attribute GetAttribute(Assembly assembly, string attrName, bool inherit)
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{
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object[] attributes = assembly.GetCustomAttributes(inherit);
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foreach (Attribute attribute in attributes)
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if ( IsInstanceOfType(attrName, attribute) )
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return attribute;
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return null;
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}
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/// <summary>
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/// Get all attributes of a given type on a member.
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/// </summary>
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/// <param name="member">The member to examine</param>
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/// <param name="attrName">The FullName of the attribute type to look for</param>
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/// <param name="inherit">True to include inherited attributes</param>
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/// <returns>The attribute or null</returns>
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public static System.Attribute[] GetAttributes( MemberInfo member, string attrName, bool inherit )
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{
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object[] attributes = member.GetCustomAttributes( inherit );
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ArrayList result = new ArrayList();
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foreach( Attribute attribute in attributes )
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if ( IsInstanceOfType( attrName, attribute ) )
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result.Add( attribute );
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return (System.Attribute[])result.ToArray( typeof( System.Attribute ) );
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}
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/// <summary>
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/// Get all attributes on a member.
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/// </summary>
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/// <param name="member">The member to examine</param>
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/// <param name="inherit">True to include inherited attributes</param>
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/// <returns>The attribute or null</returns>
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public static System.Attribute[] GetAttributes(MemberInfo member, bool inherit)
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{
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object[] attributes = member.GetCustomAttributes(inherit);
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System.Attribute[] result = new System.Attribute[attributes.Length];
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int n = 0;
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foreach (Attribute attribute in attributes)
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result[n++] = attribute;
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return result;
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}
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/// <summary>
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/// Get all attributes on an assembly.
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/// </summary>
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/// <param name="assembly">The assembly to examine</param>
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/// <param name="inherit">True to include inherited attributes</param>
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/// <returns>The attributes or null</returns>
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public static System.Attribute[] GetAttributes(Assembly assembly, bool inherit)
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{
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object[] attributes = assembly.GetCustomAttributes(inherit);
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System.Attribute[] result = new System.Attribute[attributes.Length];
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int n = 0;
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foreach (Attribute attribute in attributes)
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result[n++] = attribute;
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return result;
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}
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#endregion
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#region Interfaces
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/// <summary>
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/// Check to see if a type implements a named interface.
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/// </summary>
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/// <param name="fixtureType">The type to examine</param>
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/// <param name="interfaceName">The FullName of the interface to check for</param>
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/// <returns>True if the interface is implemented by the type</returns>
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public static bool HasInterface( Type fixtureType, string interfaceName )
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{
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foreach( Type type in fixtureType.GetInterfaces() )
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if ( type.FullName == interfaceName )
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return true;
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return false;
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}
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#endregion
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#region Inheritance
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//SHMARYA: [ 10/12/2005 ]
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/// <summary>
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/// Checks to see if a type inherits from a named type.
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/// </summary>
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/// <param name="type">The type to examine</param>
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/// <param name="parentType">The FullName of the inherited type to look for</param>
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/// <returns>True if the type inherits from the named type.</returns>
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public static bool InheritsFrom( Type type, string typeName )
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{
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for( Type current = type; current != typeof( object ); current = current.BaseType )
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if( current.FullName == typeName )
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return true;
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return false;
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}
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public static bool InheritsFrom( object obj, string typeName )
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{
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return InheritsFrom( obj.GetType(), typeName );
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}
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public static bool IsInstanceOfType( string typeName, Attribute attr )
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{
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Type type = attr.GetType();
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return type.FullName == typeName || InheritsFrom( type, typeName );
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}
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#endregion
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#region Get Methods of a type
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/// <summary>
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/// Find the default constructor on a type
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/// </summary>
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/// <param name="fixtureType"></param>
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/// <returns></returns>
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public static ConstructorInfo GetConstructor( Type fixtureType )
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{
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return fixtureType.GetConstructor( Type.EmptyTypes );
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}
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/// <summary>
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/// Find the default constructor on a type
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/// </summary>
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/// <param name="fixtureType"></param>
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/// <returns></returns>
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public static ConstructorInfo GetConstructor( Type fixtureType, Type[] types )
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{
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return fixtureType.GetConstructor( types );
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}
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/// <summary>
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/// Examine a fixture type and return a method having a particular attribute.
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/// In the case of multiple methods, the first one found is returned.
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/// </summary>
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/// <param name="fixtureType">The type to examine</param>
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/// <param name="attributeName">The FullName of the attribute to look for</param>
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/// <param name="bindingFlags">BindingFlags to use in looking for method</param>
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/// <returns>A MethodInfo or null</returns>
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public static MethodInfo GetMethodWithAttribute( Type fixtureType, string attributeName, BindingFlags bindingFlags, bool inherit )
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{
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foreach(MethodInfo method in fixtureType.GetMethods( bindingFlags ) )
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{
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if( HasAttribute( method, attributeName, inherit ) )
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return method;
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}
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return null;
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}
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/// <summary>
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/// Examine a fixture type and return a count of the methods having a
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/// particular attribute.
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/// </summary>
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/// <param name="fixtureType">The type to examine</param>
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/// <param name="attributeName">The FullName of the attribute to look for</param>
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/// <param name="bindingFlags">BindingFlags to use in looking for method</param>
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/// <returns>The number of such methods found</returns>
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public static int CountMethodsWithAttribute( Type fixtureType, string attributeName, BindingFlags bindingFlags, bool inherit )
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{
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int count = 0;
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foreach(MethodInfo method in fixtureType.GetMethods( bindingFlags ) )
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{
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if( HasAttribute( method, attributeName, inherit ) )
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count++;
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}
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return count;
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}
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/// <summary>
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/// Examine a fixture type and get a method with a particular name.
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/// In the case of overloads, the first one found is returned.
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/// </summary>
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/// <param name="fixtureType">The type to examine</param>
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/// <param name="methodName">The name of the method</param>
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/// <param name="bindingFlags">BindingFlags to use in the search</param>
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/// <returns>A MethodInfo or null</returns>
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public static MethodInfo GetNamedMethod(Type fixtureType, string methodName, BindingFlags bindingFlags)
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{
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foreach (MethodInfo method in fixtureType.GetMethods(bindingFlags))
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{
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if (method.Name == methodName)
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return method;
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}
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return null;
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}
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/// <summary>
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/// Examine a fixture type and get a method with a particular name and list
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/// of arguments. In the case of overloads, the first one found is returned.
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/// </summary>
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/// <param name="fixtureType">The type to examine</param>
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/// <param name="methodName">The name of the method</param>
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/// <param name="argTypes">The full names of the argument types to search for</param>
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/// <param name="bindingFlags">BindingFlags to use in the search</param>
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/// <returns>A MethodInfo or null</returns>
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public static MethodInfo GetNamedMethod(Type fixtureType, string methodName,
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string[] argTypes, BindingFlags bindingFlags)
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{
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foreach (MethodInfo method in fixtureType.GetMethods(bindingFlags))
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{
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if (method.Name == methodName)
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{
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ParameterInfo[] parameters = method.GetParameters();
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if (parameters.Length == argTypes.Length)
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{
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bool match = true;
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for (int i = 0; i < argTypes.Length; i++)
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if (parameters[i].ParameterType.FullName != argTypes[i])
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{
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match = false;
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break;
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}
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if (match)
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return method;
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}
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}
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}
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return null;
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}
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#endregion
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#region Get Properties of a type
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/// <summary>
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/// Examine a type and return a property having a particular attribute.
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/// In the case of multiple methods, the first one found is returned.
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/// </summary>
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/// <param name="fixtureType">The type to examine</param>
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/// <param name="attributeName">The FullName of the attribute to look for</param>
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/// <param name="bindingFlags">Binding flags to use in searching</param>
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/// <returns>A PropertyInfo or null</returns>
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public static PropertyInfo GetPropertyWithAttribute( Type fixtureType, string attributeName, BindingFlags bindingFlags )
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{
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foreach(PropertyInfo property in fixtureType.GetProperties( bindingFlags ) )
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{
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if( HasAttribute( property, attributeName, true ) )
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return property;
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}
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return null;
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}
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/// <summary>
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/// Examine a type and get a property with a particular name.
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/// In the case of overloads, the first one found is returned.
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/// </summary>
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/// <param name="type">The type to examine</param>
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/// <param name="bindingFlags">BindingFlags to use</param>
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/// <returns>A PropertyInfo or null</returns>
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public static PropertyInfo GetNamedProperty( Type type, string name, BindingFlags bindingFlags )
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{
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return type.GetProperty( name, bindingFlags );
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}
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/// <summary>
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/// Get the value of a named property on an object using binding flags of Public and Instance
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/// </summary>
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/// <param name="obj">The object for which the property value is needed</param>
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/// <param name="name">The name of a non-indexed property of the object</param>
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/// <returns></returns>
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public static object GetPropertyValue( object obj, string name )
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{
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return GetPropertyValue( obj, name, BindingFlags.Public | BindingFlags.Instance );
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}
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/// <summary>
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/// Get the value of a named property on an object
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/// </summary>
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/// <param name="obj">The object for which the property value is needed</param>
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/// <param name="name">The name of a non-indexed property of the object</param>
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/// <param name="bindingFlags">BindingFlags for use in determining which properties are needed</param>param>
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/// <returns></returns>
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public static object GetPropertyValue( object obj, string name, BindingFlags bindingFlags )
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{
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PropertyInfo property = GetNamedProperty( obj.GetType(), name, bindingFlags );
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if ( property != null )
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return property.GetValue( obj, null );
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return null;
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}
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/// <summary>
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/// Set the value of a named property on an object
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/// </summary>
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/// <param name="obj">The object for which the property value is to be set</param>
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/// <param name="name">The name of a non-indexed property of the object</param>
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/// <param name="val">The value to which the property is to be set</param>
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/// <param name="bindingFlags">BindingFlags for use in determining which properties are needed</param>param>
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public static void SetPropertyValue( object obj, string name, object val, BindingFlags bindingFlags )
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{
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PropertyInfo property = GetNamedProperty( obj.GetType(), name, bindingFlags );
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if ( property != null )
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property.SetValue( obj, val, null );
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}
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#endregion
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#region Invoke Methods
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/// <summary>
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/// Invoke the default constructor on a type
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/// </summary>
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/// <param name="type">The type to be constructed</param>
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/// <returns>An instance of the type</returns>
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public static object Construct( Type type )
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{
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ConstructorInfo ctor = GetConstructor( type );
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if ( ctor == null )
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throw new InvalidTestFixtureException(type.FullName + " does not have a valid constructor");
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return ctor.Invoke( Type.EmptyTypes );
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}
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/// <summary>
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/// Invoke a parameterless method returning void on an object.
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/// </summary>
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/// <param name="method">A MethodInfo for the method to be invoked</param>
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/// <param name="fixture">The object on which to invoke the method</param>
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public static void InvokeMethod( MethodInfo method, object fixture )
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{
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InvokeMethod( method, fixture, null );
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}
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/// <summary>
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/// Invoke a method returning void, converting any TargetInvocationException
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/// to an NUnitException
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/// </summary>
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/// <param name="method">A MethodInfo for the method to be invoked</param>
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/// <param name="fixture">The object on which to invoke the method</param>
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public static void InvokeMethod( MethodInfo method, object fixture, params object[] args )
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{
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if(method != null)
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{
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try
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{
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method.Invoke( fixture, args );
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}
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catch(TargetInvocationException e)
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{
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Exception inner = e.InnerException;
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throw new NUnitException("Rethrown",inner);
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}
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}
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}
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#endregion
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#region Private Constructor for static-only class
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private Reflect() { }
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#endregion
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}
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}
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