Assignment for RMIT Mixed Reality in 2020
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// SDK Description|SDK_Base|002
namespace VRTK
{
#if UNITY_EDITOR
using UnityEditor;
#endif
using System;
using System.Linq;
/// <summary>
/// Describes a class that represents an SDK. Only allowed on classes that inherit from SDK_Base.
/// </summary>
[AttributeUsage(AttributeTargets.Class, AllowMultiple = true, Inherited = false)]
public sealed class SDK_DescriptionAttribute : Attribute
{
/// <summary>
/// The pretty name of the SDK. Uniquely identifies the SDK.
/// </summary>
public readonly string prettyName;
/// <summary>
/// The scripting define symbol needed for the SDK. Needs to be the same as `SDK_ScriptingDefineSymbolPredicateAttribute.symbol` to add and remove the scripting define symbol automatically using VRTK_SDKManager.
/// </summary>
public readonly string symbol;
/// <summary>
/// The name of the VR Device to load.
/// </summary>
public readonly string vrDeviceName;
/// <summary>
/// The index of this attribute, in case there are multiple on the same target.
/// </summary>
public readonly int index;
#if UNITY_EDITOR
/// <summary>
/// The build target group this SDK is for.
/// </summary>
public BuildTargetGroup buildTargetGroup;
#endif
/// <summary>
/// Whether this description describes a fallback SDK.
/// </summary>
public bool describesFallbackSDK
{
get
{
return prettyName == "Fallback";
}
}
/// <summary>
/// Creates a new attribute.
/// </summary>
/// <param name="prettyName">The pretty name of the SDK. Uniquely identifies the SDK. `null` and `string.Empty` aren't allowed.</param>
/// <param name="symbol">The scripting define symbol needed for the SDK. Needs to be the same as `SDK_ScriptingDefineSymbolPredicateAttribute.symbol` to add and remove the scripting define symbol automatically using VRTK_SDKManager. `null` and `string.Empty` are allowed.</param>
/// <param name="vrDeviceName">The name of the VR Device to load. Set to `null` or `string.Empty` if no VR Device is needed.</param>
/// <param name="buildTargetGroupName">The name of a constant of `BuildTargetGroup`. `BuildTargetGroup.Unknown`, `null` and `string.Empty` are not allowed.</param>
/// <param name="index">The index of this attribute, in case there are multiple on the same target.</param>
public SDK_DescriptionAttribute(string prettyName, string symbol, string vrDeviceName, string buildTargetGroupName, int index = 0)
{
if (prettyName == null)
{
VRTK_Logger.Fatal(new ArgumentNullException("prettyName"));
return;
}
if (prettyName == string.Empty)
{
VRTK_Logger.Fatal(new ArgumentOutOfRangeException("prettyName", prettyName, "An empty string isn't allowed."));
return;
}
this.prettyName = prettyName;
this.symbol = symbol;
this.vrDeviceName = string.IsNullOrEmpty(vrDeviceName) ? "None" : vrDeviceName;
this.index = index;
if (string.IsNullOrEmpty(buildTargetGroupName))
{
buildTargetGroupName = "Unknown";
}
#if UNITY_EDITOR
Type buildTargetGroupType = typeof(BuildTargetGroup);
try
{
buildTargetGroup = (BuildTargetGroup)Enum.Parse(buildTargetGroupType, buildTargetGroupName);
}
catch (Exception exception)
{
VRTK_Logger.Fatal(new ArgumentOutOfRangeException(string.Format("'{0}' isn't a valid constant name of '{1}'.", buildTargetGroupName, buildTargetGroupType.Name), exception));
return;
}
if (buildTargetGroup == BuildTargetGroup.Unknown && !describesFallbackSDK)
{
VRTK_Logger.Fatal(new ArgumentOutOfRangeException("buildTargetGroupName", buildTargetGroupName, string.Format("'{0}' isn't allowed.", buildTargetGroupName)));
return;
}
#endif
}
/// <summary>
/// Creates a new attribute by copying from another attribute on a given type.
/// </summary>
/// <param name="typeToCopyExistingDescriptionFrom">The type to copy the existing SDK_DescriptionAttribute from. `null` is not allowed.</param>
/// <param name="index">The index of the description to copy from the the existing SDK_DescriptionAttribute.</param>
public SDK_DescriptionAttribute(Type typeToCopyExistingDescriptionFrom, int index = 0)
{
if (typeToCopyExistingDescriptionFrom == null)
{
VRTK_Logger.Fatal(new ArgumentNullException("typeToCopyExistingDescriptionFrom"));
return;
}
Type descriptionType = typeof(SDK_DescriptionAttribute);
SDK_DescriptionAttribute[] descriptions = GetDescriptions(typeToCopyExistingDescriptionFrom);
if (descriptions.Length == 0)
{
VRTK_Logger.Fatal(new ArgumentOutOfRangeException("typeToCopyExistingDescriptionFrom", typeToCopyExistingDescriptionFrom, string.Format("'{0}' doesn't specify any SDK descriptions via '{1}' to copy.", typeToCopyExistingDescriptionFrom.Name, descriptionType.Name)));
return;
}
if (descriptions.Length <= index)
{
VRTK_Logger.Fatal(new ArgumentOutOfRangeException("index", index, string.Format("'{0}' has no '{1}' at that index.", typeToCopyExistingDescriptionFrom.Name, descriptionType.Name)));
return;
}
SDK_DescriptionAttribute description = descriptions[index];
prettyName = description.prettyName;
symbol = description.symbol;
vrDeviceName = description.vrDeviceName;
this.index = index;
#if UNITY_EDITOR
buildTargetGroup = description.buildTargetGroup;
#endif
}
public static SDK_DescriptionAttribute[] GetDescriptions(Type type)
{
return VRTK_SharedMethods.GetTypeCustomAttributes(type, typeof(SDK_DescriptionAttribute), false)
.Cast<SDK_DescriptionAttribute>()
.OrderBy(attribute => attribute.index)
.ToArray();
}
}
}