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source: nscp/include/settings/settings_interface_impl.hpp @ c760fc9

0.4.00.4.10.4.2

Last change on this file since c760fc9 was c760fc9, checked in by Michael Medin <michael@…>, 2 years ago
Fixed so old settings mappings are read/stored in a text file Changed so all polugin use the "simple-plugin interface Created a settings helper for the "core" (and started to use it)
Property mode set to `100644`
File size: 25.0 KB

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1	/**************************************************************************
2	* Copyright (C) 2004-2007 by Michael Medin <michael@medin.name> *
3	* *
4	* This code is part of NSClient++ - http://trac.nakednuns.org/nscp *
5	* *
6	* This program is free software; you can redistribute it and/or modify *
7	* it under the terms of the GNU General Public License as published by *
8	* the Free Software Foundation; either version 2 of the License, or *
9	* (at your option) any later version. *
10	* *
11	* This program is distributed in the hope that it will be useful, *
12	* but WITHOUT ANY WARRANTY; without even the implied warranty of *
13	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
14	* GNU General Public License for more details. *
15	* *
16	* You should have received a copy of the GNU General Public License *
17	* along with this program; if not, write to the *
18	* Free Software Foundation, Inc., *
19	* 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. *
20	***************************************************************************/
21	#pragma once
22
23	#include <types.hpp>
24	#include <Singleton.h>
25	#include <string>
26	#include <map>
27	#include <set>
28	#include <boost/thread/thread.hpp>
29	#include <boost/thread/locks.hpp>
30	#include <boost/filesystem/path.hpp>
31	#include <boost/regex.hpp>
32	#include <strEx.h>
33	#include <settings/settings_core.hpp>
34
35
36	#define MUTEX_GUARD() \
37	boost::unique_lock<boost::timed_mutex> mutex(mutex_, boost::get_system_time() + boost::posix_time::seconds(5)); \
38	if (!mutex.owns_lock()) \
39	throw settings_exception(_T("Failed to get mutex, cant get settings instance"));
40
41
42	namespace settings {
43	class SettingsInterfaceImpl : public settings_interface {
44	protected:
45	settings_core *core_;
46	typedef std::list<instance_raw_ptr> parent_list_type;
47	parent_list_type children_;
48	boost::timed_mutex mutex_;
49	public:
50	struct conainer {
51	settings_core::key_type type;
52	int int_val;
53	std::wstring string_val;
54	conainer(int value) : type(settings_core::key_integer), int_val(value) {}
55	conainer(bool value) : type(settings_core::key_bool), int_val(value?1:0) {}
56	conainer(std::wstring value) : type(settings_core::key_string), string_val(value) {}
57	conainer() : type(settings_core::key_string) {}
58
59	std::wstring get_string() const {
60	if (type==settings_core::key_string)
61	return string_val;
62	if (type==settings_core::key_integer)
63	return strEx::itos(int_val);
64	if (type==settings_core::key_bool)
65	return int_val==1?_T("true"):_T("false");
66	return _T("UNKNOWN TYPE");
67	}
68	int get_int() const {
69	if (type==settings_core::key_string)
70	return strEx::stoi(string_val);
71	if (type==settings_core::key_integer)
72	return int_val;
73	if (type==settings_core::key_bool)
74	return int_val==1?1:0;
75	return -1;
76	}
77	bool get_bool() const {
78	if (type==settings_core::key_string)
79	return string_to_bool(string_val);
80	if (type==settings_core::key_integer)
81	return int_val==1?true:false;
82	if (type==settings_core::key_bool)
83	return int_val==1?true:false;
84	return false;
85	}
86	};
87	typedef settings_core::key_path_type cache_key_type;
88	typedef std::map<cache_key_type,conainer> cache_type;
89	typedef std::set<std::wstring> path_cache_type;
90	typedef std::map<std::wstring,std::set<std::wstring> > key_cache_type;
91	cache_type settings_cache_;
92	path_cache_type path_cache_;
93	key_cache_type key_cache_;
94	std::wstring context_;
95	net::url url_;
96
97	//SettingsInterfaceImpl() : core_(NULL) {}
98	SettingsInterfaceImpl(settings_core *core, std::wstring context) : core_(core), context_(context), url_(net::parse(context_)) {}
99
100	//////////////////////////////////////////////////////////////////////////
101	/// Empty all cached settings values and force a reload.
102	/// Notice this does not save so anhy "active" values will be flushed and new ones read from file.
103	///
104	/// @author mickem
105	void clear_cache() {
106	MUTEX_GUARD();
107	settings_cache_.clear();
108	path_cache_.clear();
109	key_cache_.clear();
110	}
111
112	//////////////////////////////////////////////////////////////////////////
113	/// Set the core module to use
114	///
115	/// @param core The core to use
116	///
117	/// @author mickem
118	virtual void set_core(settings_core *core) {
119	MUTEX_GUARD();
120	core_ = core;
121	}
122	settings_core* get_core() const {
123	if (core_ == NULL)
124	throw settings_exception(_T("FATAL ERROR: Settings subsystem not initialized"));
125	return core_;
126	}
127	logger_interface* get_logger() const {
128	if (core_ == NULL)
129	throw settings_exception(_T("FATAL ERROR: Settings subsystem not initialized"));
130	return core_->get_logger();
131	}
132
133	void add_child(std::wstring context) {
134	MUTEX_GUARD();
135	children_.push_back(get_core()->create_instance(context));
136	}
137
138	//////////////////////////////////////////////////////////////////////////
139	/// Get a string value if it does not exist exception will be thrown
140	///
141	/// @param path the path to look up
142	/// @param key the key to lookup
143	/// @return the string value
144	///
145	/// @author mickem
146	virtual std::wstring get_string(std::wstring path, std::wstring key) {
147	MUTEX_GUARD();
148	settings_core::key_path_type lookup(path,key);
149	cache_type::const_iterator cit = settings_cache_.find(lookup);
150	if (cit == settings_cache_.end()) {
151	std::wstring val;
152	try {
153	val = get_real_string(lookup);
154	} catch (KeyNotFoundException e) {
155	val = get_string_from_child_unsafe(lookup);
156	}
157	settings_cache_[lookup] = val;
158	return val;
159	}
160	return (*cit).second.get_string();
161	}
162	std::wstring get_string_from_child_unsafe(settings_core::key_path_type key) {
163	for (parent_list_type::iterator it = children_.begin(); it != children_.end(); ++it) {
164	try {
165	return (*it)->get_string(key.first, key.second);
166	} catch (KeyNotFoundException e) {
167	continue;
168	}
169	}
170	throw KeyNotFoundException(key);
171	}
172	//////////////////////////////////////////////////////////////////////////
173	/// Get a string value if it does not exist the default value will be returned
174	///
175	/// @param path the path to look up
176	/// @param key the key to lookup
177	/// @param def the default value to use when no value is found
178	/// @return the string value
179	///
180	/// @author mickem
181	virtual std::wstring get_string(std::wstring path, std::wstring key, std::wstring def) {
182	try {
183	return get_string(path, key);
184	} catch (KeyNotFoundException e) {
185	MUTEX_GUARD();
186	settings_cache_[cache_key_type(path,key)] = def;
187	return def;
188	}
189	}
190	//////////////////////////////////////////////////////////////////////////
191	/// Set or update a string value
192	///
193	/// @param path the path to look up
194	/// @param key the key to lookup
195	/// @param value the value to set
196	///
197	/// @author mickem
198	virtual void set_string(std::wstring path, std::wstring key, std::wstring value) {
199	{
200	MUTEX_GUARD();
201	settings_cache_[cache_key_type(path,key)] = value;
202	}
203	add_key(path, key);
204	}
205
206	virtual void add_path(std::wstring path) {
207	MUTEX_GUARD();
208	path_cache_.insert(path);
209	}
210	virtual void add_key(std::wstring path, std::wstring key) {
211	MUTEX_GUARD();
212	key_cache_type::iterator it = key_cache_.find(path);
213	if (it == key_cache_.end()) {
214	std::set<std::wstring> s;
215	s.insert(key);
216	key_cache_[path] = s;
217	} else {
218	if ((it).second.find(key) == (it).second.end()) {
219	(*it).second.insert(key);
220	}
221	}
222	}
223
224	//////////////////////////////////////////////////////////////////////////
225	/// Get an integer value if it does not exist exception will be thrown
226	///
227	/// @param path the path to look up
228	/// @param key the key to lookup
229	/// @return the string value
230	///
231	/// @author mickem
232	virtual int get_int(std::wstring path, std::wstring key) {
233	MUTEX_GUARD();
234	settings_core::key_path_type lookup(path,key);
235	cache_type::const_iterator cit = settings_cache_.find(lookup);
236	if (cit == settings_cache_.end()) {
237	int val;
238	try {
239	val = get_real_int(lookup);
240	} catch (KeyNotFoundException e) {
241	val = get_int_from_child_unsafe(path, key);
242	}
243	settings_cache_[lookup] = val;
244	return val;
245	}
246	return (*cit).second.get_int();
247	}
248	int get_int_from_child_unsafe(std::wstring path, std::wstring key) {
249	for (parent_list_type::iterator it = children_.begin(); it != children_.end(); ++it) {
250	try {
251	return (*it)->get_int(path, key);
252	} catch (KeyNotFoundException e) {
253	continue;
254	}
255	}
256	throw KeyNotFoundException(path, key);
257	}
258	//////////////////////////////////////////////////////////////////////////
259	/// Get an integer value if it does not exist the default value will be returned
260	///
261	/// @param path the path to look up
262	/// @param key the key to lookup
263	/// @param def the default value to use when no value is found
264	/// @return the string value
265	///
266	/// @author mickem
267	virtual int get_int(std::wstring path, std::wstring key, int def) {
268	try {
269	return get_int(path, key);
270	} catch (KeyNotFoundException e) {
271	MUTEX_GUARD();
272	settings_cache_[cache_key_type(path,key)] = def;
273	return def;
274	}
275	}
276	//////////////////////////////////////////////////////////////////////////
277	/// Set or update an integer value
278	///
279	/// @param path the path to look up
280	/// @param key the key to lookup
281	/// @param value the value to set
282	///
283	/// @author mickem
284	virtual void set_int(std::wstring path, std::wstring key, int value) {
285	{
286	MUTEX_GUARD();
287	settings_cache_[cache_key_type(path,key)] = value;
288	}
289	add_key(path, key);
290	}
291
292	//////////////////////////////////////////////////////////////////////////
293	/// Get the type of a key (String, int, bool)
294	///
295	/// @param path the path to get type for
296	/// @param key the key to get the type for
297	/// @return the type of the key
298	///
299	/// @author mickem
300	virtual settings_core::key_type get_key_type(std::wstring path, std::wstring key) {
301	MUTEX_GUARD();
302	cache_type::iterator it = settings_cache_.find(cache_key_type(path, key));
303	if (it == settings_cache_.end())
304	return settings_core::key_string;
305	return it->second.type;
306	}
307
308	//////////////////////////////////////////////////////////////////////////
309	/// Get a boolean value if it does not exist exception will be thrown
310	///
311	/// @param path the path to look up
312	/// @param key the key to lookup
313	/// @return the string value
314	///
315	/// @author mickem
316	virtual bool get_bool(std::wstring path, std::wstring key) {
317	MUTEX_GUARD();
318	settings_core::key_path_type lookup(path,key);
319	cache_type::const_iterator cit = settings_cache_.find(lookup);
320	if (cit == settings_cache_.end()) {
321	bool val;
322	try {
323	val = get_real_bool(lookup);
324	} catch (KeyNotFoundException e) {
325	val = get_bool_from_child_unsafe(path, key);
326	}
327	settings_cache_[lookup] = val;
328	return val;
329	}
330	return (*cit).second.get_bool();
331	}
332	bool get_bool_from_child_unsafe(std::wstring path, std::wstring key) {
333	for (parent_list_type::iterator it = children_.begin(); it != children_.end(); ++it) {
334	try {
335	return (*it)->get_bool(path, key);
336	} catch (KeyNotFoundException e) {
337	continue;
338	}
339	}
340	throw KeyNotFoundException(path, key);
341	}
342	//////////////////////////////////////////////////////////////////////////
343	/// Get a boolean value if it does not exist the default value will be returned
344	///
345	/// @param path the path to look up
346	/// @param key the key to lookup
347	/// @param def the default value to use when no value is found
348	/// @return the string value
349	///
350	/// @author mickem
351	virtual bool get_bool(std::wstring path, std::wstring key, bool def) {
352	try {
353	return get_bool(path, key);
354	} catch (KeyNotFoundException e) {
355	MUTEX_GUARD();
356	settings_cache_[cache_key_type(path,key)] = def;
357	return def;
358	}
359	}
360	//////////////////////////////////////////////////////////////////////////
361	/// Set or update a boolean value
362	///
363	/// @param path the path to look up
364	/// @param key the key to lookup
365	/// @param value the value to set
366	///
367	/// @author mickem
368	virtual void set_bool(std::wstring path, std::wstring key, bool value) {
369	{
370	MUTEX_GUARD();
371	settings_cache_[cache_key_type(path,key)] = value;
372	}
373	add_key(path, key);
374	}
375
376
377	// Meta Functions
378	//////////////////////////////////////////////////////////////////////////
379	/// Get all (sub) sections (given a path).
380	/// If the path is empty all root sections will be returned
381	///
382	/// @param path The path to get sections from (if empty root sections will be returned)
383	/// @return a list of sections
384	///
385	/// @author mickem
386	virtual string_list get_sections(std::wstring path) {
387	MUTEX_GUARD();
388	get_core()->get_logger()->debug(__FILE__, __LINE__, std::wstring(_T("Get sections for: ")) + path);
389	string_list ret;
390	get_cached_sections_unsafe(path, ret);
391	get_real_sections(path, ret);
392	get_section_from_child_unsafe(path, ret);
393	ret.sort();
394	ret.unique();
395	return ret;
396	}
397	void get_cached_sections_unsafe(std::wstring path, string_list &list) {
398	if (path.empty()) {
399	BOOST_FOREACH(std::wstring s, path_cache_) {
400	if (s.length() > 1) {
401	std::wstring::size_type pos = s.find(L'/', 1);
402	if (pos != std::wstring::npos)
403	list.push_back(s.substr(0,pos));
404	else
405	list.push_back(s);
406	}
407	}
408	} else {
409	std::wstring::size_type path_len = path.length();
410	BOOST_FOREACH(std::wstring s, path_cache_) {
411	std::wstring::size_type len = s.length();
412	if (s.length() > (path_len+1) && s.substr(0,path_len) == path) {
413	std::wstring::size_type pos = s.find(L'/', path_len+1);
414	if (pos != std::wstring::npos)
415	list.push_back(s.substr(path_len+1,pos));
416	else
417	list.push_back(s.substr(path_len+1));
418	}
419	}
420	}
421	}
422	void get_section_from_child_unsafe(std::wstring path, string_list &list) {
423	for (parent_list_type::iterator it = children_.begin(); it != children_.end(); ++it) {
424	string_list itm = (*it)->get_sections(path);
425	list.insert(list.end(), itm.begin(), itm.end());
426	}
427	}
428	//////////////////////////////////////////////////////////////////////////
429	/// Get all keys for a path.
430	///
431	/// @param path The path to get keys under
432	/// @return a list of keys
433	///
434	/// @author mickem
435	virtual string_list get_keys(std::wstring path) {
436	MUTEX_GUARD();
437	string_list ret;
438	get_cached_keys_unsafe(path, ret);
439	get_real_keys(path, ret);
440	get_keys_from_child_unsafe(path, ret);
441	ret.sort();
442	ret.unique();
443	return ret;
444	}
445	void get_cached_keys_unsafe(std::wstring path, string_list &list) {
446	key_cache_type::iterator it = key_cache_.find(path);
447	if (it != key_cache_.end()) {
448	BOOST_FOREACH(std::wstring s, (*it).second) {
449	list.push_back(s);
450	}
451	}
452	}
453	void get_keys_from_child_unsafe(std::wstring path, string_list &list) {
454	for (parent_list_type::iterator it = children_.begin(); it != children_.end(); ++it) {
455	string_list itm = (*it)->get_keys(path);
456	list.insert(list.end(), itm.begin(), itm.end());
457	}
458	}
459	//////////////////////////////////////////////////////////////////////////
460	/// Does the section exists?
461	///
462	/// @param path The path of the section
463	/// @return true/false
464	///
465	/// @author mickem
466	virtual bool has_section(std::wstring path) {
467	throw settings_exception(_T("TODO: FIX ME: has_section"));
468	}
469	//////////////////////////////////////////////////////////////////////////
470	/// Does the key exists?
471	///
472	/// @param path The path of the section
473	/// @param key The key to check
474	/// @return true/false
475	///
476	/// @author mickem
477	virtual bool has_key(std::wstring path, std::wstring key) {
478	MUTEX_GUARD();
479	settings_core::key_path_type lookup(path,key);
480	cache_type::const_iterator cit = settings_cache_.find(lookup);
481	if (cit != settings_cache_.end())
482	return true;
483	return has_real_key(lookup);
484	}
485
486	// Misc Functions
487	//////////////////////////////////////////////////////////////////////////
488	/// Get a context.
489	/// The context is an identifier for the settings store for INI/XML it is the filename.
490	///
491	/// @return the context
492	///
493	/// @author mickem
494	virtual std::wstring get_context() {
495	MUTEX_GUARD();
496	return context_;
497	}
498	virtual std::wstring get_file_from_context() {
499	return core_->find_file(url_.host + url_.path, _T(""));
500	}
501	//////////////////////////////////////////////////////////////////////////
502	/// Set the context.
503	/// The context is an identifier for the settings store for INI/XML it is the filename.
504	///
505	/// @param context the new context
506	///
507	/// @author mickem
508	virtual void set_context(std::wstring context) {
509	MUTEX_GUARD();
510	context_ = context;
511	}
512
513	// Save/Load Functions
514	//////////////////////////////////////////////////////////////////////////
515	/// Reload the settings store
516	///
517	/// @author mickem
518	virtual void reload() {
519	throw settings_exception(_T("TODO: FIX ME: reload"));
520	}
521	//////////////////////////////////////////////////////////////////////////
522	/// Copy the settings store to another settings store
523	///
524	/// @param other the settings store to save to
525	///
526	/// @author mickem
527	virtual void save_to(std::wstring other) {
528	instance_ptr i = get_core()->create_instance(other);
529	save_to(i);
530	}
531	virtual void save_to(instance_ptr other) {
532	if (!other)
533	throw settings_exception(_T("Cant migrate to NULL instance!"));
534	other->clear_cache();
535	st_copy_section(_T(""), other);
536	other->save();
537	}
538	void st_copy_section(std::wstring path, instance_ptr other) {
539	if (!other)
540	throw settings_exception(_T("Failed to create new instance!"));
541	string_list list = get_sections(path);
542	std::wstring subpath = path;
543	// TODO: check trailing / instead!
544	if (!subpath.empty())
545	subpath += _T("/");
546	for (string_list::const_iterator cit = list.begin();cit != list.end(); ++cit) {
547	st_copy_section(subpath + *cit, other);
548	}
549	list = get_keys(path);
550	for (string_list::const_iterator cit = list.begin();cit != list.end(); ++cit) {
551	settings_core::key_path_type key(path, *cit);
552	settings_core::key_type type = get_key_type(key.first, key.second);
553	if (type ==settings_core::key_string) {
554	try {
555	other->set_string(key.first, key.second, get_string(key.first, key.second));
556	} catch (KeyNotFoundException e) {
557	other->set_string(key.first, key.second, _T(""));
558	}
559	} else if (type ==settings_core::key_integer)
560	other->set_int(key.first, key.second, get_int(key.first, key.second));
561	else if (type ==settings_core::key_bool)
562	other->set_bool(key.first, key.second, get_bool(key.first, key.second));
563	else
564	throw settings_exception(_T("Invalid type for key: ") + key.first + _T(".") + key.second);
565	}
566	}
567	//////////////////////////////////////////////////////////////////////////
568	/// Save the settings store
569	///
570	/// @author mickem
571	virtual void save() {
572	MUTEX_GUARD();
573	BOOST_FOREACH(std::wstring path, path_cache_) {
574	set_real_path(path);
575	}
576	std::set<std::wstring> sections;
577	for (cache_type::const_iterator cit = settings_cache_.begin(); cit != settings_cache_.end(); ++cit) {
578	set_real_value((cit).first, (cit).second);
579	sections.insert((*cit).first.first);
580	}
581	BOOST_FOREACH(std::wstring str, get_core()->get_reg_sections()) {
582	set_real_path(str);
583	}
584	}
585	/////////////////////////////////////////////////////////////////////////
586	/// Load from another settings store
587	///
588	/// @param other the other settings store to load from
589	///
590	/// @author mickem
591	virtual void load_from(instance_ptr other) {
592	throw settings_exception(_T("TODO: FIX ME: load_from"));
593	}
594	//////////////////////////////////////////////////////////////////////////
595	/// Load from another context.
596	/// The context is an identifier for the settings store for INI/XML it is the filename.
597	///
598	/// @param context the context to load from
599	///
600	/// @author mickem
601	virtual void load_from(std::wstring context) {
602	throw settings_exception(_T("TODO: FIX ME: load_from"));
603	}
604	//////////////////////////////////////////////////////////////////////////
605	/// Load settings from the context.
606	///
607	/// @author mickem
608	virtual void load() {
609	throw settings_exception(_T("TODO: FIX ME: load"));
610	}
611
612	//////////////////////////////////////////////////////////////////////////
613	/// VIRTUAL FUNCTIONS ////
614	//////////////////////////////////////////////////////////////////////////
615
616	//////////////////////////////////////////////////////////////////////////
617	/// Get all (sub) sections (given a path).
618	/// If the path is empty all root sections will be returned
619	///
620	/// @param path The path to get sections from (if empty root sections will be returned)
621	/// @param list The list to append nodes to
622	/// @return a list of sections
623	///
624	/// @author mickem
625	virtual void get_real_sections(std::wstring path, string_list &list) = 0;
626	//////////////////////////////////////////////////////////////////////////
627	/// Get all keys given a path/section.
628	/// If the path is empty all root sections will be returned
629	///
630	/// @param path The path to get sections from (if empty root sections will be returned)
631	/// @param list The list to append nodes to
632	/// @return a list of sections
633	///
634	/// @author mickem
635	virtual void get_real_keys(std::wstring path, string_list &list) = 0;
636
637	//////////////////////////////////////////////////////////////////////////
638	/// Get a string value if it does not exist exception will be thrown
639	///
640	/// @param key the key to lookup
641	/// @return the string value
642	///
643	/// @author mickem
644	virtual std::wstring get_real_string(settings_core::key_path_type key) = 0;
645	//////////////////////////////////////////////////////////////////////////
646	/// Get an integer value if it does not exist exception will be thrown
647	///
648	/// @param key the key to lookup
649	/// @return the int value
650	///
651	/// @author mickem
652	virtual int get_real_int(settings_core::key_path_type key) = 0;
653	//////////////////////////////////////////////////////////////////////////
654	/// Get a boolean value if it does not exist exception will be thrown
655	///
656	/// @param key the key to lookup
657	/// @return the boolean value
658	///
659	/// @author mickem
660	virtual bool get_real_bool(settings_core::key_path_type key) = 0;
661
662	//////////////////////////////////////////////////////////////////////////
663	/// Write a value to the resulting context.
664	///
665	/// @param key The key to write to
666	/// @param value The value to write
667	///
668	/// @author mickem
669	virtual void set_real_value(settings_core::key_path_type key, conainer value) = 0;
670
671	//////////////////////////////////////////////////////////////////////////
672	/// Write a value to the resulting context.
673	///
674	/// @param key The key to write to
675	/// @param value The value to write
676	///
677	/// @author mickem
678	virtual void set_real_path(std::wstring path) = 0;
679
680	//////////////////////////////////////////////////////////////////////////
681	/// Check if a key exists
682	///
683	/// @param key the key to lookup
684	/// @return true/false if the key exists.
685	///
686	/// @author mickem
687	virtual bool has_real_key(settings_core::key_path_type key) = 0;
688	//////////////////////////////////////////////////////////////////////////
689	/// Get the type this settings store represent.
690	///
691	/// @return the type of settings store
692	///
693	/// @author mickem
694	// virtual settings_core::settings_type get_type() = 0;
695	//////////////////////////////////////////////////////////////////////////
696	/// Is this the active settings store
697	///
698	/// @return
699	///
700	/// @author mickem
701	// virtual bool is_active() = 0;
702
703	//////////////////////////////////////////////////////////////////////////
704	/// Create a new settings interface of "this kind"
705	///
706	/// @param context the context to use
707	/// @return the newly created settings interface
708	///
709	/// @author mickem
710	virtual SettingsInterfaceImpl* create_new_context(std::wstring context) = 0;
711
712
713	virtual std::wstring to_string() {
714	std::wstring ret = get_info();
715	if (!children_.empty()) {
716	ret += _T("parents = [");
717	BOOST_FOREACH(parent_list_type::value_type i, children_) {
718	ret += i->to_string();
719	}
720	ret += _T("]");
721	}
722	return ret + _T("}");
723	}
724	};
725	}

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