94 lines
2.9 KiB
C#
94 lines
2.9 KiB
C#
/*
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* Copyright 2022 Peter Han
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* Permission is hereby granted, free of charge, to any person obtaining a copy of this software
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* and associated documentation files (the "Software"), to deal in the Software without
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* restriction, including without limitation the rights to use, copy, modify, merge, publish,
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* distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in all copies or
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* substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING
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* BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
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* DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*/
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using System;
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namespace PeterHan.PLib.Detours {
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/// <summary>
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/// Stores delegates used to read and write fields or properties. This version is lazy and
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/// only calculates the destination when it is first used.
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///
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/// This class is not thread safe.
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/// </summary>
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/// <typeparam name="P">The containing type of the field or property.</typeparam>
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/// <typeparam name="T">The element type of the field or property.</typeparam>
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internal sealed class LazyDetouredField<P, T> : IDetouredField<P, T> {
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/// <summary>
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/// Invoke to get the field/property value.
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/// </summary>
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public Func<P, T> Get {
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get {
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Initialize();
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return getter;
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}
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}
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/// <summary>
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/// The field name.
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/// </summary>
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public string Name { get; }
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/// <summary>
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/// Invoke to set the field/property value.
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/// </summary>
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public Action<P, T> Set {
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get {
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Initialize();
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return setter;
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}
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}
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/// <summary>
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/// The function to get the field value.
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/// </summary>
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private Func<P, T> getter;
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/// <summary>
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/// The function to set the field value.
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/// </summary>
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private Action<P, T> setter;
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/// <summary>
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/// The target type.
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/// </summary>
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private readonly Type type;
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internal LazyDetouredField(Type type, string name) {
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this.type = type ?? throw new ArgumentNullException(nameof(type));
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Name = name ?? throw new ArgumentNullException(nameof(name));
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getter = null;
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setter = null;
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}
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/// <summary>
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/// Initializes the getter and setter functions immediately if necessary.
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/// </summary>
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public void Initialize() {
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if (getter == null && setter == null) {
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var dt = PDetours.DetourField<P, T>(Name);
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getter = dt.Get;
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setter = dt.Set;
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}
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}
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public override string ToString() {
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return string.Format("LazyDetouredField[type={1},name={0}]", Name, type.FullName);
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}
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}
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}
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