public CommandExecutorContext(ICommandExecutor executor, CommandExpression expression, object parameter)
{
if (executor == null)
{
throw new ArgumentNullException(nameof(executor));
}
if (expression == null)
{
throw new ArgumentNullException(nameof(expression));
}
_executor = executor;
_expression = expression;
_parameter = parameter;
}
public CommandContext(ICommandExecutor executor, CommandExpression expression, ICommand command, object parameter, IDictionary <string, object> extendedProperties = null)
{
if (command == null)
{
throw new ArgumentNullException("command");
}
_executor = executor;
_command = command;
_parameter = parameter;
_expression = expression;
if (extendedProperties != null && extendedProperties.Count > 0)
{
_extendedProperties = new Dictionary <string, object>(extendedProperties, StringComparer.OrdinalIgnoreCase);
}
}
protected virtual object ExecuteCommand(CommandExecutorContext context, CommandExpression expression, CommandTreeNode node, object parameter)
{
if (context == null)
{
throw new ArgumentNullException(nameof(context));
}
if (node == null)
{
throw new ArgumentNullException(nameof(node));
}
if (node.Command == null)
{
return(null);
}
return(node.Command.Execute(this.CreateCommandContext(expression, node, parameter)));
}
public CommandContext(ICommandExecutor executor, CommandExpression expression, CommandTreeNode commandNode, object parameter, IDictionary <string, object> extendedProperties = null)
{
if (commandNode == null)
{
throw new ArgumentNullException("commandNode");
}
if (commandNode.Command == null)
{
throw new ArgumentException(string.Format("The Command property of '{0}' command-node is null.", commandNode.FullPath));
}
_executor = executor;
_commandNode = commandNode;
_command = commandNode.Command;
_parameter = parameter;
_expression = expression;
if (extendedProperties != null && extendedProperties.Count > 0)
{
_extendedProperties = new Dictionary <string, object>(extendedProperties, StringComparer.OrdinalIgnoreCase);
}
}
public CommandExpression Parse(string text)
{
if (string.IsNullOrWhiteSpace(text))
{
return(null);
}
CommandExpression result = null;
CommandExpression current = null;
using (var reader = new StringReader(text))
{
while (reader.Peek() > 0)
{
current = Parse(reader);
if (result == null)
{
result = current;
}
else //线性查找命令表达式的管道链，并更新其指向
{
var previous = result;
while (previous.Next != null)
{
previous = previous.Next;
}
previous.Next = current;
}
}
}
return(result);
}
protected virtual CommandContext CreateCommandContext(CommandExpression expression, CommandTreeNode node, object parameter)
{
return(new CommandContext(this, expression, node, parameter));
}
