chunk 2: remaining non-audio non-NewImport assets

Assets/GooglePlayPlugins/com.google.play.common/Runtime/Scripts/PlayAsyncOperation.cs

@@ -0,0 +1,93 @@
+// Copyright 2019 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+using System;
+using UnityEngine;
+
+namespace Google.Play.Common
+{
+    /// <summary>
+    /// Represents an asynchronous operation that produces a result upon completion.
+    /// </summary>
+    /// <typeparam name="TResult">The type of the result of the operation.</typeparam>
+    /// <typeparam name="TError">The type of error that can be encountered during this operation.</typeparam>
+    public abstract class PlayAsyncOperation<TResult, TError> : CustomYieldInstruction
+    {
+        /// <summary>
+        /// Whether or not the operation has finished.
+        /// </summary>
+        public bool IsDone { get; protected set; }
+
+        /// <summary>
+        /// Whether or not the operation completed without error.
+        /// </summary>
+        public abstract bool IsSuccessful { get; }
+
+        /// <summary>
+        /// The error that prevented this operation from completing successfully.
+        /// In the case of a successful operation, this value can be ignored.
+        /// </summary>
+        public TError Error { get; protected set; }
+
+        /// <summary>
+        /// Event that is invoked upon operation completion. If an event handler is registered after the operation has
+        /// completed, and thus after this event has been invoked, then the handler will be called synchronously.
+        /// </summary>
+        public virtual event Action<PlayAsyncOperation<TResult, TError>> Completed = delegate { };
+
+        /// <summary>
+        /// Implements the <a href="https://docs.unity3d.com/ScriptReference/CustomYieldInstruction-keepWaiting.html">CustomYieldInstruction.keepWaiting</a>
+        /// property so that this request can be yielded on in a coroutine.
+        /// </summary>
+        public override bool keepWaiting
+        {
+            get { return !IsDone; }
+        }
+
+        /// <summary>
+        /// Gets the result, if the operation is done.
+        /// </summary>
+        /// <exception cref="InvalidOperationException">
+        /// Throws if GetResult is called before the operation is done, or if an error occured during the operation.
+        /// </exception>
+        public TResult GetResult()
+        {
+            if (!IsDone)
+            {
+                throw new InvalidOperationException("GetResult called before operation is done.");
+            }
+
+            if (!IsSuccessful)
+            {
+                throw new InvalidOperationException("GetResult called after operation failed with error: " + Error);
+            }
+
+            return GetResultImpl();
+        }
+
+        /// <summary>
+        /// Invokes the <see cref="Completed"/> event.
+        /// </summary>
+        protected void InvokeCompletedEvent()
+        {
+            Completed.Invoke(this);
+        }
+
+        /// <summary>
+        /// Returns the operation result.
+        /// </summary>
+        /// <returns>The result of the operation.</returns>
+        protected abstract TResult GetResultImpl();
+    }
+}