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Technosoftware/DaAeHdaClient/OpcReadOnlyCollection.cs

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+#region Copyright (c) 2011-2023 Technosoftware GmbH. All rights reserved
+//-----------------------------------------------------------------------------
+// Copyright (c) 2011-2023 Technosoftware GmbH. All rights reserved
+// Web: https://www.technosoftware.com 
+// 
+// The source code in this file is covered under a dual-license scenario:
+//   - Owner of a purchased license: SCLA 1.0
+//   - GPL V3: everybody else
+//
+// SCLA license terms accompanied with this source code.
+// See SCLA 1.0: https://technosoftware.com/license/Source_Code_License_Agreement.pdf
+//
+// GNU General Public License as published by the Free Software Foundation;
+// version 3 of the License are accompanied with this source code.
+// See https://technosoftware.com/license/GPLv3License.txt
+//
+// This source code is distributed in the hope that it will be useful, but
+// WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+// or FITNESS FOR A PARTICULAR PURPOSE.
+//-----------------------------------------------------------------------------
+#endregion Copyright (c) 2011-2023 Technosoftware GmbH. All rights reserved
+
+#region Using Directives
+using System;
+using System.Collections;
+using System.Runtime.Serialization;
+#endregion
+
+namespace Technosoftware.DaAeHdaClient
+{
+    /// <summary>
+    /// A read only collection class which can be used to expose arrays as properties of classes.
+    /// </summary>
+    [Serializable]
+    public class OpcReadOnlyCollection : ICollection, ICloneable, ISerializable
+    {
+        #region Fields
+        private Array array_;
+        #endregion
+
+        #region Public Methods
+        /// <summary>
+        /// An indexer for the collection.
+        /// </summary>
+        public virtual object this[int index] => array_.GetValue(index);
+
+        /// <summary>
+        /// Returns a copy of the collection as an array.
+        /// </summary>
+        public virtual Array ToArray()
+        {
+            return (Array)OpcConvert.Clone(array_);
+        }
+        #endregion
+
+        #region Protected Interface
+        /// <summary>
+        ///Creates a collection that wraps the specified array instance.
+        /// </summary>
+		protected OpcReadOnlyCollection(Array array)
+        {
+            Array = array;
+        }
+
+        /// <summary>
+        /// The array instance exposed by the collection.
+        /// </summary>
+        protected virtual Array Array
+        {
+            get => array_;
+
+            set
+            {
+                array_ = value;
+
+                if (array_ == null)
+                {
+                    array_ = new object[0];
+                }
+            }
+        }
+        #endregion
+
+        #region ISerializable Members
+        /// <summary>
+        /// A set of names for fields used in serialization.
+        /// </summary>
+        private class Names
+        {
+            internal const string Array = "AR";
+        }
+
+        /// <summary>
+        /// Construct a server by de-serializing its OpcUrl from the stream.
+        /// </summary>
+        protected OpcReadOnlyCollection(SerializationInfo info, StreamingContext context)
+        {
+            array_ = (Array)info.GetValue(Names.Array, typeof(Array));
+        }
+
+        /// <summary>
+        /// Serializes a server into a stream.
+        /// </summary>
+        public virtual void GetObjectData(SerializationInfo info, StreamingContext context)
+        {
+            info.AddValue(Names.Array, array_);
+        }
+        #endregion
+
+        #region ICollection Members
+        /// <summary>
+        /// Indicates whether access to the ICollection is synchronized (thread-safe).
+        /// </summary>
+        public virtual bool IsSynchronized => false;
+
+        /// <summary>
+        /// Gets the number of objects in the collection.
+        /// </summary>
+        public virtual int Count => array_.Length;
+
+        /// <summary>
+        /// Copies the objects to an Array, starting at a the specified index.
+        /// </summary>
+        /// <param name="array">The one-dimensional Array that is the destination for the objects.</param>
+        /// <param name="index">The zero-based index in the Array at which copying begins.</param>
+        public virtual void CopyTo(Array array, int index)
+        {
+            if (array_ != null)
+            {
+                array_.CopyTo(array, index);
+            }
+        }
+
+        /// <summary>
+        /// Indicates whether access to the ICollection is synchronized (thread-safe).
+        /// </summary>
+        public virtual object SyncRoot => this;
+
+        #endregion
+
+        #region IEnumerable Members
+        /// <summary>
+        /// Returns an enumerator that can iterate through a collection.
+        /// </summary>
+        /// <returns>An IEnumerator that can be used to iterate through the collection.</returns>
+        public virtual IEnumerator GetEnumerator()
+        {
+            return array_.GetEnumerator();
+        }
+        #endregion
+
+        #region ICloneable Members
+        /// <summary>
+        /// Creates a deep copy of the collection.
+        /// </summary>
+        public virtual object Clone()
+        {
+            var clone = (OpcReadOnlyCollection)MemberwiseClone();
+
+            var array = new ArrayList(array_.Length);
+
+            // clone the elements and determine the element type.
+            Type elementType = null;
+
+            for (var ii = 0; ii < array_.Length; ii++)
+            {
+                var element = array_.GetValue(ii);
+
+                if (elementType == null)
+                {
+                    elementType = element.GetType();
+                }
+                else if (elementType != typeof(object))
+                {
+                    while (!(elementType is null) && !elementType.IsInstanceOfType(element))
+                    {
+                        elementType = elementType.BaseType;
+                    }
+                }
+
+                array.Add(OpcConvert.Clone(element));
+            }
+
+            // convert array list to an array.
+            clone.Array = array.ToArray(elementType);
+
+            return clone;
+        }
+        #endregion
+    }
+}