Stefano Raggi
70 lines
2.9 KiB
C#
70 lines
2.9 KiB
C#
/*
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* QUANTCONNECT.COM - Democratizing Finance, Empowering Individuals.
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* Lean Algorithmic Trading Engine v2.0. Copyright 2014 QuantConnect Corporation.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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using System;
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using System.Collections.Generic;
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using Python.Runtime;
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using QuantConnect.Util;
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namespace QuantConnect.Exceptions
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{
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/// <summary>
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/// Interprets <see cref="KeyErrorPythonExceptionInterpreter"/> instances
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/// </summary>
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public class KeyErrorPythonExceptionInterpreter : IExceptionInterpreter
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{
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/// <summary>
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/// Determines the order that an instance of this class should be called
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/// </summary>
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public int Order => 0;
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/// <summary>
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/// Determines if this interpreter should be applied to the specified exception.
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/// </summary>
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/// <param name="exception">The exception to check</param>
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/// <returns>True if the exception can be interpreted, false otherwise</returns>
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public bool CanInterpret(Exception exception)
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{
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return
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exception?.GetType() == typeof(PythonException) &&
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exception.Message.Contains("KeyError");
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}
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/// <summary>
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/// Interprets the specified exception into a new exception
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/// </summary>
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/// <param name="exception">The exception to be interpreted</param>
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/// <param name="innerInterpreter">An interpreter that should be applied to the inner exception.</param>
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/// <returns>The interpreted exception</returns>
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public Exception Interpret(Exception exception, IExceptionInterpreter innerInterpreter)
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{
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var pe = (PythonException)exception;
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var key = string.Empty;
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if (pe.Message.Contains("["))
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{
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key = pe.Message.GetStringBetweenChars('[', ']');
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}
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else if (pe.Message.Contains("\'"))
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{
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key = pe.Message.GetStringBetweenChars('\'', '\'');
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}
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var message = $"Trying to retrieve an element from a collection using a key that does not exist in that collection throws a KeyError exception. To prevent the exception, ensure that the {key} key exist in the collection and/or that collection is not empty.";
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message += PythonUtil.PythonExceptionStackParser(pe.StackTrace);
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return new KeyNotFoundException(message, pe);
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}
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}
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} |