public CommandExecutor(ICommandExpressionParser parser = null)
{
_root = new CommandTreeNode();
_parser = parser ?? CommandExpressionParser.Instance;
_output = NullCommandOutlet.Instance;
_error = CommandErrorWriter.Instance;
}
public CommandTreeNode(ICommand command, CommandTreeNode parent = null) : base(command.Name, parent)
{
if (command == null)
{
throw new ArgumentNullException("command");
}
_command = command;
_children = new CommandTreeNodeCollection(this);
}
public void Load(CommandTreeNode node)
{
if (node == null || _isLoaded)
{
return;
}
lock (_syncRoot)
{
if (_isLoaded)
{
return;
}
_isLoaded = this.OnLoad(node);
}
}
private CommandTreeNode FindDown(CommandTreeNode current, Predicate <CommandTreeNode> predicate)
{
if (current == null || predicate == null)
{
return(null);
}
if (predicate(current))
{
return(current);
}
foreach (var child in current._children)
{
if (this.FindDown(child, predicate) != null)
{
return(child);
}
}
return(null);
}
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);
}
}
/// <summary> /// 执行加载命令的实际操作。 /// </summary> /// <param name="node">待加载的命令树节点。</param> /// <returns>如果加载成功则返回真(true)，否则返回假(false)。</returns> protected abstract bool OnLoad(CommandTreeNode node);
public CommandTreeNode(string name, CommandTreeNode parent = null) : base(name, parent)
{
_children = new CommandTreeNodeCollection(this);
}
protected virtual CommandContext CreateCommandContext(CommandExpression expression, CommandTreeNode node, object parameter)
{
return(new CommandContext(this, expression, node, parameter));
}
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)));
}
