4 // Fraunhofer Institute for Open Communication Systems (FOKUS)
5 // Competence Center NETwork research (NET), St. Augustin, GERMANY
6 // Stefan Bund <g0dil@berlios.de>
8 // This program is free software; you can redistribute it and/or modify
9 // it under the terms of the GNU General Public License as published by
10 // the Free Software Foundation; either version 2 of the License, or
11 // (at your option) any later version.
13 // This program is distributed in the hope that it will be useful,
14 // but WITHOUT ANY WARRANTY; without even the implied warranty of
15 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 // GNU General Public License for more details.
18 // You should have received a copy of the GNU General Public License
19 // along with this program; if not, write to the
20 // Free Software Foundation, Inc.,
21 // 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
24 \brief Node public header */
26 /** \defgroup node_tree The node tree
28 The console/config node tree is the central data-structure of the library. Into this tree, all
29 commands and parameters are entered. The tree is then exposed using a file-system like
34 \section console_tree The tree
36 We will start by giving a more complete example. This example contains most of the stuff needed
37 for using the console/config library.
40 // Define callback function.
41 void mycommand(std::ostream & os, senf::console::ParseCommandInfo const & command)
44 os << "!! Important message ...\n";
50 // Declare a directory node (proxy) for use by this class. This must be public so we can add
51 // it to the node tree later.
52 senf::console::ScopedDirectory<SomeClass> dir;
54 SomeClass() : dir(this)
56 // You may document the directory here or later when adding it to the tree
57 dir.doc("Manager for something");
59 // Add a member function (the pointer-to-member is automatically bound to this instance)
60 dir.add("member", &SomeClass::member)
61 .doc("Do the member operation");
64 void member(std::ostream & os, senf::console::ParseCommandInfo const & command)
72 // Provide global documentation
74 .doc("This is someServer server");
76 // Add a new directory to the root and document it. All the mutators return the node object
77 // itself so operations can be chained.
78 senf::console::DirectoryNode & mydir (
80 .doc("My server specific directory"));
82 // Add a command to that directory
83 mydir.add("mycommand", &mycommand)
84 .doc("mycommand <foo> [<bar>]\n\n"
85 "If <bar> is given, flurgle the <foo>, otherwise burgle it");
87 // Create a SomeClass instance and add it's directory.
89 mydir.add("someClass", someClass.dir);
91 // Start the interactive console server
92 senf::console::Server::start(senf::INet4SocketAddress(senf::INet4Address::None, 23232u))
97 \subsection console_nodes Node types
99 The console/config library tree consists of two basic node types:
101 \li senf::console::DirectoryNode provides internal nodes with an arbitrary number of children
102 \li senf::console::CommandNode describes a command entry in the tree
103 \li senf::console::LinkNode is a link to another node. It works much like a symlink on POSIX
106 senf::console::CommandNode is the base-class of all command nodes of which there are several,
107 depending on the type of command.
109 There is a single root node, the senf::console::DirectoryNode called senf::console::root(). From
110 this node, the tree is traversed.
112 All nodes are allocated on the heap and are managed using a smart pointer.
114 \subsection console_manipulate Manipulating the node tree
116 There are several ways to add nodes to the tree:
118 \li A senf::console::DirectoryNode can be added using senf::console::DirectoryNode::mkdir().
119 \li An arbitrary node can be created and then (possibly later) added to the tree using the
120 corresponding senf::console::DirectoryNode::add() overload.
121 \li A senf::console::CommandNode is normally added to the tree by directly adding a callback
122 using one of the overloaded senf::console::DirectoryNode::add() members. See \ref
124 \li A senf::console::LinkNode is created by senf::console::DirectoryNode::link()
126 When directly adding a node callback, the type of node added depends on the type of
127 callback. The callback types which can be added are listed at \ref console_callbacks.
130 void callback(std::ostream & os, senf::console::ParseCommandInfo const & command) { ... }
132 myDirectory.add("foo",&callback);
135 Every node is identified among it's siblings by it's name. The name of the node is set when
136 adding the node to the tree. If the name is empty or non-unique, a unique name will be
137 automatically provided.
139 To remove a node from the tree, just use the nodes senf::console::GenericNode::unlink() or the
140 parents senf::console::DirectoryNode::remove() member. This call removes the node from it's
141 parent and returns a (smart) node pointer.
143 \li If you ignore the return value, the node (and it's children) will be deleted.
144 \li Alternatively, you may store away the node and re-attach it later.
145 \li An node (or subtree) can be moved to a different place by unlinking the node at it's old
146 place and re-adding it at it's new location.
147 \li To rename a node, unlink and re-add it with a different name.
150 myDirectory.add("bar", myDirectory.remove("foo"));
153 \subsection console_node_param Assigning additional node parameters
155 Depending on the node type added, additional node parameters may be set. For example, every node
156 has a documentation parameter which is used by the online-help system. To assign these
157 parameters, the node exposes corresponding member functions. Since
158 senf::console::DirectoryNode::add() returns the newly added node by reference, additional
159 parameters may just be added to the end of the add command:
161 myDirectory.add("foo",&fooCallback).doc("The foo method");
163 Since the parameter setters all return the node reference, additional parameters may just be
164 added to the end of the command.
166 \subsection console_tree_traverse Traversing the tree
168 The simplest way to access tree elements is to save the return value of the
169 senf::console::DirectoryNode::add() members. However, saving the reference will not ensure, that
170 the node is not removed. If the node might be removed from the tree, you should use a smart
171 pointer (either <tt>ptr</tt> or <tt>weak_ptr</tt>) to hold the node.
173 Another possibility is to traverse the tree explicitly. For this purpose, the operators '[]' and
174 '()' have been overloaded in senf::console::DirectoryNode.
176 senf::console::root().getDirectory("myDirectory").getCommand("foo")
177 \\ or more concise but otherwise completely identical
178 senf::console::root()["myDirectory"]("foo")
181 getDirectory and the '[]' operator will return a senf::console::DirectoryNode whereas getCommand
182 and the '()' operator will return a senf::console::CommandNode. If the node is not found or is
183 not of the correct type, an exception will be raised.
185 \section console_object_dir Assigning a directory to an object instance
187 Most objects will register several commands. So it makes sense for these objects to manage their
188 own directory. Since directories are however allocated on the heap, they cannot be directly
189 added to a class. To facilitate this usage, the senf::console::ScopedDirectory is used. This
190 class provides a senf::console::DirectoryNode facade. Internally, it automatically creates a
191 senf::console::DirectoryNode to which all calls are forwarded.
193 The senf::console::ScopedDirectory member should be declared public. This allows the user of the
194 class to add the node to the tree.
197 #ifndef HH_SENF_Scheduler_Console_Node_
198 #define HH_SENF_Scheduler_Console_Node_ 1
202 #include <boost/shared_ptr.hpp>
203 #include <boost/weak_ptr.hpp>
204 #include <boost/enable_shared_from_this.hpp>
205 #include <boost/utility.hpp>
206 #include <boost/range/iterator_range.hpp>
207 #include <boost/typeof/typeof.hpp>
208 #include <boost/type_traits/remove_reference.hpp>
209 #include "../../Utils/Exception.hh"
210 #include "../../Utils/mpl.hh"
211 #include "../../Utils/Logger/SenfLog.hh"
212 #include "../../Utils/type_traits.hh"
215 //#include "Node.mpp"
216 ///////////////////////////////hh.p////////////////////////////////////////
225 DirectoryNode & root();
227 /** \brief Config/console node tree base-class
229 GenericNode is the base class of all node objects. There are two basic node types derived
230 from GenericNode: DirectoryNode and CommandNode.
232 All nodes are dynamically allocated and automatically managed using reference counting.
234 All nodes are normally linked into a single tree which root node is
235 senf::console::root(). Nodes may however be orphaned (not linked to the tree) either
236 directly (the node has no parent) or indirectly (the node has a parent but is part of an
237 orphaned subtree which is not linked to the root node).
239 Every active (non-orphaned) node (except the root() node) has a non-empty node name. This
240 name is assigned to the node when adding the node to the tree.
245 : public boost::enable_shared_from_this<GenericNode>
247 SENF_LOG_CLASS_AREA();
249 ///////////////////////////////////////////////////////////////////////////
252 typedef boost::shared_ptr<GenericNode> ptr;
253 typedef boost::shared_ptr<GenericNode const> cptr;
254 typedef boost::weak_ptr<GenericNode> weak_ptr;
256 ///////////////////////////////////////////////////////////////////////////
258 virtual ~GenericNode();
260 std::string const & name() const; ///< Node name
261 boost::shared_ptr<DirectoryNode> parent() const; ///< Parent node
262 /**< May be null, if the node is the root node or if it is
263 not linked to the tree */
265 std::string path() const; ///< Node path
266 /**< The node path is built by joining the names of all
267 parent nodes with '/' chars. */
268 std::string path(DirectoryNode const & root) const;
269 ///< Node path up to \a root
270 /**< The node path is built by joining the names of all
271 parent nodes up to \a root with '/' chars. */
273 ptr unlink(); ///< Remove node from it's parent directory
274 /**< You may either discard the return value and thereby
275 dispose the node or may re-attach the node at some
276 other place using DirectoryNode::add(). */
278 bool active() const; ///< \c true, if node is attached to the root() node
280 void help(std::ostream & output) const; /// Write help info to \a output
282 ptr thisptr(); ///< Get smart pointer to node
283 cptr thisptr() const; ///< Get smart pointer to node (const)
285 bool isChildOf(DirectoryNode & parent) const;
286 ///< \c true, if node is a child of \a parent
287 /**< Will also return \c true, if \a parent is the current
290 bool operator== (GenericNode & other) const;
291 ///< \c true, if this and \a other are the same node
292 bool operator!= (GenericNode & other) const;
293 ///< \c true, if this and \a other are different nodes
295 bool isDirectory() const; ///< \c true, if this is a directory node
296 bool isLink() const; ///< \c true, if this is a link node
297 bool isCommand() const; ///< \c true, if this is a command node
299 GenericNode const & followLink() const; ///< Follow link if \c this node is a link node
300 GenericNode & followLink(); ///< Follow link if \c this node is a link node
305 void name(std::string const & name);
312 virtual void v_help(std::ostream & output) const = 0;
313 ///< Provide help information
314 /**< This member must be implemented in derived classes
315 to provide node specific help information. */
319 DirectoryNode * parent_;
321 friend class DirectoryNode;
324 /** \brief Config/console tree link node
326 A LinkNode references another node and provides an additional alias name for that node. A
327 LinkNode works like a mixture of UNIX symlinks and hardlinks: It is an explicit link like a
328 UNIX symlink but references another node directly (not via it's path) like a UNIX
329 hardlink. Therefore, a LinkNode works across chroot().
335 ///////////////////////////////////////////////////////////////////////////
338 typedef boost::shared_ptr<LinkNode> ptr;
339 typedef boost::shared_ptr<LinkNode const> cptr;
340 typedef boost::weak_ptr<LinkNode> weak_ptr;
342 ///////////////////////////////////////////////////////////////////////////
343 ///\name Structors and default members
346 static ptr create(GenericNode & node); ///< Create new link node.
347 /**< You should normally use DirectoryNode::link() to
348 create a link node. */
351 ///////////////////////////////////////////////////////////////////////////
353 GenericNode & follow() const; ///< Access the referenced node
358 explicit LinkNode(GenericNode & node);
360 virtual void v_help(std::ostream &) const;
362 GenericNode::ptr node_;
365 class SimpleCommandNode;
367 /** \brief Internal: Node creation helper traits
369 This class is used internally to find out the type of node to create for a specific argument
372 template <class Object>
373 struct NodeCreateTraits
375 typedef BOOST_TYPEOF_TPL( senf_console_add_node(
376 * static_cast<DirectoryNode *>(0),
377 * static_cast<std::string const *>(0),
378 * static_cast<Object *>(0),
380 typedef typename senf::remove_cvref<base_type>::type value_type;
382 typedef typename value_type::node_type NodeType;
383 typedef typename value_type::return_type result_type;
387 static result_type create(DirectoryNode & node, std::string const & name,
392 /** \brief Config/console tree directory node
394 This node type provides the internal and root nodes of the tree. It allows to add arbitrary
395 children and supports directory traversal.
397 Nodes are normally not instantiated manually but are created by the DirectoryNode via
398 mkdir() or add(). Special add() members however allow externally allocated node objects.
400 Nodes may be added to the tree only once, otherwise chaos will ensue. Since nodes are always
401 managed dynamically, there is a special ScopedDirectory proxy template which provides a
402 DirectoryNode facade. ScopedDirectory is used if a class wants to manage it's own directory
405 Every node is assigned a (new) name when it is added to a directory. If the directory
406 already has an entry of that name, the name is made unique by appending a suffix of the form
407 '-n' where n is a number starting at 1. If the name is empty, int is set to 'unnamed' and
408 then uniquified as above. Automatically providing unique names simplifies adding
409 configuration/console support to generic components.
413 class DirectoryNode : public GenericNode
415 SENF_LOG_CLASS_AREA();
416 typedef std::map<std::string, GenericNode::ptr> ChildMap;
418 ///////////////////////////////////////////////////////////////////////////
421 typedef boost::shared_ptr<DirectoryNode> ptr;
422 typedef boost::shared_ptr<DirectoryNode const> cptr;
423 typedef boost::weak_ptr<DirectoryNode> weak_ptr;
425 typedef boost::iterator_range<ChildMap::const_iterator> ChildrenRange;
426 typedef ChildMap::const_iterator child_iterator;
428 typedef DirectoryNode node_type;
429 typedef DirectoryNode & return_type;
431 ///////////////////////////////////////////////////////////////////////////
432 ///\name Structors and default members
435 static ptr create(); ///< Create node object.
436 /**< You should normally use either mkdir() or
437 ScopedDirectory instead of create() */
440 ///////////////////////////////////////////////////////////////////////////
444 template <class NodeType>
445 NodeType & add(std::string const & name, boost::shared_ptr<NodeType> node);
446 ///< Add node to tree
447 /**< Adds the \a node to the tree as a child of \a this
448 node. The node is given the name \a name. If a node of
449 that name already exists, a numeric suffix of the form
450 '-n' is added to the name until the name is unique. If
451 \a name is empty, it is set to 'unnamed'. */
453 template <class Object>
454 typename NodeCreateTraits<Object>::result_type add(std::string const & name,
456 ///< Generic child node factory
457 /**< This member is used to create a new child node of the
458 current directory. The type of node created depends on
459 the type of argument passed.
461 The node type is selected by the NodeCreateTraits
462 class. To allow adding a specific node type, you need
463 to provide an overload for
464 <tt>senf_console_add_node</tt> which must be visible at
465 when you register the new node.
467 MyNodeType & senf_console_add_node(
469 std::string const & name,
470 MySpecialObject const & ob,
473 return dir.add(name, MyNodeType::create(ob));
476 (Do not forget the last unnamed 'int' parameter which
477 is not used but serves to disambiguate the
480 template <class Object>
481 typename NodeCreateTraits<Object>::result_type add(std::string const & name,
483 ///< Generic child node factory
486 GenericNode::ptr remove(std::string const & name);
487 ///< Remove node \a name from the tree
488 /**< The returned pointer may either be discarded, which
489 will automatically dispose the removed node, or it may
490 be saved and/or re-attached at some other place in the
493 bool hasChild(std::string const & name) const;
494 ///< \c true, if there is a child with name \a name
496 GenericNode & get(std::string const & name) const;
497 ///< Get child node automatically dereferencing links
498 /**< \throws UnknownNodeNameException if a child \a name
500 GenericNode & getLink(std::string const & name) const;
501 ///< Get child node without dereferencing links
502 /**< \throws UnknownNodeNameException if a child \a name
505 DirectoryNode & getDirectory(std::string const & name) const;
506 ///< Get directory child node (dereferencing links)
507 /**< Same as operator[]
508 \throws UnknownNodeNameException if a child \a name
510 \throws std::bad_cast if the child \a name is not a
513 DirectoryNode & operator[](std::string const & name) const;
514 ///< Get directory child node (dereferencing links)
515 /**< Same as getDirectory
516 \throws UnknownNodeNameException if a child \a name
518 \throws std::bad_cast if the child \a name is not a
521 CommandNode & getCommand(std::string const & name) const;
522 ///< Get command child node (dereferencing links)
523 /**< Same as operator()
524 \throws UnknownNodeNameException if a child \a name
526 \throws std::bad_cast if the child \a name is not a
529 CommandNode & operator()(std::string const & name) const;
530 ///< Get command child node (dereferencing links)
531 /**< Same as getCommand()
532 \throws UnknownNodeNameException if a child \a name
534 \throws std::bad_cast if the child \a name is not a
537 DirectoryNode & mkdir(std::string const & name);
538 ///< Create sub-directory node
540 ChildrenRange children() const; ///< Return iterator range over all children.
541 /**< The returned range is sorted by child name. */
543 ChildrenRange completions(std::string const & s) const;
544 ///< Return iterator range of completions for \a s
545 /**< The returned range is sorted by child name. */
547 void link(std::string const & name, GenericNode & target);
548 ///< Create a child node which is a link to target. \a s
549 /**< The new link node will be a child of the node for which this member function is called. */
552 ///////////////////////////////////////////////////////////////////////////
554 DirectoryNode & doc(std::string const & doc); ///< Set node documentation
557 cptr thisptr() const;
563 void add(GenericNode::ptr node);
564 virtual void v_help(std::ostream & output) const;
569 friend DirectoryNode & root();
572 /// Exception: Unknown node name
573 struct UnknownNodeNameException : public senf::Exception
574 { UnknownNodeNameException() : senf::Exception("Unknown node name") {}};
577 template <class Type>
578 struct NodeCreateTraits< boost::shared_ptr<Type> >
582 /** \brief Config/console tree command node
584 The CommandNode is the base-class for the tree leaf nodes. Concrete command node
585 implementations are derived from this class.
587 To execute a command, CommandNode::operator()() or CommandNode::execute() is called.
589 Subclass instances of this node type are automatically created when adding commands to the
590 tree. See \ref console_commands.
594 class CommandNode : public GenericNode
596 SENF_LOG_CLASS_AREA();
598 ///////////////////////////////////////////////////////////////////////////
601 typedef boost::shared_ptr<CommandNode> ptr;
602 typedef boost::shared_ptr<CommandNode const> cptr;
603 typedef boost::weak_ptr<CommandNode> weak_ptr;
605 ///////////////////////////////////////////////////////////////////////////
607 void execute(std::ostream & output, ParseCommandInfo const & command) const;
608 ///< Execute the command
609 /**< Same as operator()()
610 \param[in] output stream where result messages may be
612 \param[in] arguments command arguments. This is a
613 range of ranges of Token instances. */
615 void operator()(std::ostream & output, ParseCommandInfo const & command) const;
616 ///< Execute the command
617 /**< Same as execute()
618 \param[in] output stream where result messages may be
620 \param[in] arguments command arguments. This is a
621 range of ranges of Token instances. */
624 cptr thisptr() const;
632 virtual void v_execute(std::ostream & output, ParseCommandInfo const & command) const = 0;
633 ///< Called to execute the command
634 /**< \param[in] output stream where result messages may be
636 \param[in] arguments command arguments. This is a
637 range of ranges of Token instances. */
642 /** \brief Most simple CommandNode implementation
644 This CommandNode implementation simply forwards the \a output and \a arguments arguments to
645 an arbitrary callback. Thus, it allows to add callbacks with the signature
647 void callback(std::ostream & os, senf::console::ParseCommandInfo const & command)
652 \ingroup console_commands
654 class SimpleCommandNode : public CommandNode
656 SENF_LOG_CLASS_AREA();
658 ///////////////////////////////////////////////////////////////////////////
661 typedef boost::shared_ptr<SimpleCommandNode> ptr;
662 typedef boost::shared_ptr<SimpleCommandNode const> cptr;
663 typedef boost::weak_ptr<SimpleCommandNode> weak_ptr;
665 typedef boost::function<void (std::ostream &, ParseCommandInfo const &)> Function;
667 typedef SimpleCommandNode node_type;
668 typedef SimpleCommandNode & return_type;
670 ///////////////////////////////////////////////////////////////////////////
671 ///\name Structors and default members
674 static ptr create(Function const & fn);
677 ///////////////////////////////////////////////////////////////////////////
680 cptr thisptr() const;
682 SimpleCommandNode & doc(std::string const & doc);
685 SimpleCommandNode(Function const & fn);
688 virtual void v_help(std::ostream & output) const;
689 virtual void v_execute(std::ostream & output, ParseCommandInfo const & command) const;
698 SimpleCommandNode & senf_console_add_node(DirectoryNode & node, std::string const & name,
699 SimpleCommandNode::Function fn, int);
705 #include BOOST_TYPEOF_INCREMENT_REGISTRATION_GROUP()
707 BOOST_TYPEOF_REGISTER_TYPE(senf::console::DirectoryNode)
708 BOOST_TYPEOF_REGISTER_TYPE(senf::console::SimpleCommandNode)
711 ///////////////////////////////hh.e////////////////////////////////////////
721 // comment-column: 40
722 // c-file-style: "senf"
723 // indent-tabs-mode: nil
724 // ispell-local-dictionary: "american"
725 // compile-command: "scons -u test"