/// <summary>
/// Executes the registered command by invoking the contained action.
/// </summary>
/// <param name="result">The result of the command parsing process pertinent to the registered command.</param>
/// <exception cref="ArgumentNullException">Thrown when the given command result is null.</exception>
/// <exception cref="InvalidOperationException">Thrown when invocation of the contained action fails.</exception>
public void Execute(CommandResult result)
{
VerificationProvider.VerifyNotNull(result, "result");
// Get hold of the relevant converter for the command value type
var converter = mObjectConverterFactory.Create <TValue>();
TValue value = converter.Convert(result.Value);
try
{
mExecutionAction.Invoke(value);
}
catch (Exception ex)
{
// Wrap the exception within an InvalidOperationException and re-throw
throw new InvalidOperationException(
"An error occurred while executing the command. See inner exception for details.", ex);
}
}
/// <summary>
/// Attempts to retrieve a value from the set of commands that is stored under the given key.
/// </summary>
/// <typeparam name="TValue">The type of the value to be retrieved.</typeparam>
/// <param name="key">The key of the command to retrieve.</param>
/// <param name="value">An output parameter that will be populated with the requested value.</param>
/// <returns>True if the given key matches a stored command; false otherwise.</returns>
/// <exception cref="ArgumentException">Thrown when the given key value is not a valid string.</exception>
public bool TryGetValue <TValue>(string key, out TValue value)
{
VerificationProvider.VerifyValidString(key, "key");
// Initialize the output parameter with a default value
value = default(TValue);
CommandResult command;
if (!mKeyedCommands.TryGetValue(key, out command))
{
// The command does not exist under the given key
return(false);
}
// We have the command, so get hold of the relevant converter for its type
var converter = mObjectConverterFactory.Create <TValue>();
value = converter.Convert(command.Value);
return(true);
}