| #region License |
| |
| /* |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you 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 |
| * |
| * http://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. |
| */ |
| |
| #endregion |
| |
| using System.Collections.Generic; |
| using System.Threading; |
| |
| namespace Gremlin.Net.Process.Traversal |
| { |
| /// <summary> |
| /// Bindings are used to associate a variable with a value. |
| /// </summary> |
| public class Bindings |
| { |
| /// <summary> |
| /// Gets an instance of the <see cref="Bindings" /> class. |
| /// </summary> |
| public static Bindings Instance { get; } = new Bindings(); |
| |
| private static readonly ThreadLocal<Dictionary<object, string>> BoundVariableByValue = |
| new ThreadLocal<Dictionary<object, string>>(); |
| |
| /// <summary> |
| /// Binds the variable to the specified value. |
| /// </summary> |
| /// <param name="variable">The variable to bind.</param> |
| /// <param name="value">The value to which the variable should be bound.</param> |
| /// <returns>The bound value.</returns> |
| public TV Of<TV>(string variable, TV value) |
| { |
| var dict = BoundVariableByValue.Value; |
| if (dict == null) |
| { |
| dict = new Dictionary<object, string>(); |
| BoundVariableByValue.Value = dict; |
| } |
| dict[value] = variable; |
| return value; |
| } |
| |
| internal static string GetBoundVariable<TV>(TV value) |
| { |
| var dict = BoundVariableByValue.Value; |
| if (dict == null) |
| return null; |
| dict.TryGetValue(value, out var variable); |
| return variable; |
| } |
| |
| internal static void Clear() |
| { |
| BoundVariableByValue.Value?.Clear(); |
| } |
| } |
| } |