X-Git-Url: http://git.tdb.fi/?a=blobdiff_plain;f=source%2Fcollection.h;h=98b359e5eaedd28604a5d1f0a0085f470a657219;hb=256b44a5009467171af53316141277027bcc0ba4;hp=d0e8a1a8bb9b25c636ab23a8c1e4bbdcfa5c04a7;hpb=465ac6c7ceda80ce7e2f6e3f7b6901ce0921406e;p=libs%2Fdatafile.git

diff --git a/source/collection.h b/source/collection.h
index d0e8a1a..98b359e 100644
--- a/source/collection.h
+++ b/source/collection.h
@@ -1,8 +1,10 @@
 #ifndef MSP_DATAFILE_COLLECTION_H_
 #define MSP_DATAFILE_COLLECTION_H_
 
+#include <type_traits>
 #include <msp/core/attributes.h>
 #include <msp/core/maputils.h>
+#include <msp/core/noncopyable.h>
 #include <msp/core/refptr.h>
 #include "collectionsource.h"
 #include "loader.h"
@@ -49,7 +51,7 @@ that are not present.  Items retrieted from the fallback collection are shared
 between the collections, and are only deleted when all collections in the chain
 have been destroyed.
 */
-class Collection
+class Collection: private NonCopyable
 {
 public:
 	/**
@@ -83,16 +85,12 @@ public:
 
 private:
 	typedef std::map<std::string, Variant> ItemMap;
-	typedef std::vector<CollectionItemTypeBase *> TypeList;
-	typedef std::vector<const CollectionSource *> SourceList;
 
-	TypeList types;
+	std::vector<CollectionItemTypeBase *> types;
 	ItemMap items;
-	SourceList sources;
+	std::vector<const CollectionSource *> sources;
 	Collection *fallback;
 
-	Collection(const Collection &);
-	Collection &operator=(const Collection &);
 public:
 	Collection();
 	virtual ~Collection();
@@ -105,10 +103,11 @@ public:
 		if(!item)
 			throw std::invalid_argument("Collection::add(item)");
 
-		RefPtr<typename RemoveConst<T>::Type> ptr(item);
+		typedef typename std::remove_cv<T>::type NCT;
+		RefPtr<NCT> ptr(item);
 		try
 		{
-			insert_unique(items, name, ptr);
+			add_var(name, get_type<NCT>(name), ptr);
 		}
 		catch(...)
 		{
@@ -122,7 +121,7 @@ public:
 	template<typename T>
 	T &get(const std::string &name) const
 	{
-		return extract<typename RemoveConst<T>::Type>(get_item(items, name));
+		return extract<typename std::remove_cv<T>::type>(get_item(items, name));
 	}
 
 	/** Gets a typed object from the collection.  If the name is not found,
@@ -131,12 +130,32 @@ public:
 	template<typename T>
 	T &get(const std::string &name)
 	{
-		typedef typename RemoveConst<T>::Type NCT;
+		typedef typename std::remove_cv<T>::type NCT;
 		return extract<NCT>(get_var(name, get_type<NCT>(name)));
 	}
 
+	/** Finds a typed object in the collection.  Returns null if the name does
+	not exist.  Throws if the name exists but the object is of an incorrect
+	type. */
+	template<typename T>
+	T *find(const std::string &name) const
+	{
+		ItemMap::const_iterator i = items.find(name);
+		return (i!=items.end() ? extract<typename std::remove_cv<T>::type>(i->second) : 0);
+	}
+
+	template<typename T>
+	T *find(const std::string &name)
+	{
+		typedef typename std::remove_cv<T>::type NCT;
+		const Variant *var = find_var(name, get_type<NCT>(name));
+		return (var ? &extract<NCT>(*var) : 0);
+	}
+
 private:
+	void add_var(const std::string &, const CollectionItemTypeBase *, const Variant &);
 	const Variant &get_var(const std::string &, const CollectionItemTypeBase *);
+	const Variant *find_var(const std::string &, const CollectionItemTypeBase *);
 
 	template<typename T>
 	T &extract(const Variant &var) const;
@@ -145,8 +164,8 @@ private:
 	std::list<T *> extract_list(const std::vector<const Variant *> &vars) const
 	{
 		std::list<T *> result;
-		for(std::vector<const Variant *>::const_iterator i=vars.begin(); i!=vars.end(); ++i)
-			result.push_back(&extract<T>(**i));
+		for(const Variant *v: vars)
+			result.push_back(&extract<T>(*v));
 		return result;
 	}
 
@@ -167,7 +186,7 @@ public:
 	std::list<std::string> get_names() const
 	{
 		std::list<std::string> names;
-		gather_items<typename RemoveConst<T>::Type>(0, &names, 0, false);
+		gather_items<typename std::remove_cv<T>::type>(0, &names, 0, false);
 		return names;
 	}
 
@@ -177,7 +196,7 @@ public:
 	std::list<std::string> get_names()
 	{
 		std::list<std::string> names;
-		gather_items<typename RemoveConst<T>::Type>(0, &names, 0, true);
+		gather_items<typename std::remove_cv<T>::type>(0, &names, 0, true);
 		return names;
 	}
 
@@ -186,7 +205,7 @@ public:
 	std::list<T *> get_list() const
 	{
 		std::vector<const Variant *> vars;
-		gather_items<typename RemoveConst<T>::Type>(&vars, 0, 0, false);
+		gather_items<typename std::remove_cv<T>::type>(&vars, 0, 0, false);
 		return extract_list<T>(vars);
 	}
 
@@ -195,12 +214,12 @@ public:
 	template<typename T>
 	std::list<T *> get_list()
 	{
-		CollectionItemTypeBase *type = get_type<typename RemoveConst<T>::Type>();
+		CollectionItemTypeBase *type = get_type<typename std::remove_cv<T>::type>();
 		if(type)
 			load_items_from_sources(*type);
 
 		std::vector<const Variant *> vars;
-		gather_items<typename RemoveConst<T>::Type>(&vars, 0, type, true);
+		gather_items<typename std::remove_cv<T>::type>(&vars, 0, type, true);
 		return extract_list<T>(vars);
 	}
 
@@ -222,24 +241,24 @@ public:
 	/// Checks whether a typed object exists in the collection.
 	template<typename T>
 	bool contains(const std::string &name) const
-	{ return get_status<typename RemoveConst<T>::Type>(name)==1; }
+	{ return get_status<typename std::remove_cv<T>::type>(name)==1; }
 
 	/** Checks whether a typed object exists in the collection or is loadable
 	from a source. */
 	template<typename T>
 	bool contains(const std::string &name)
-	{ return get_status<typename RemoveConst<T>::Type>(name)>0; }
+	{ return get_status<typename std::remove_cv<T>::type>(name)>0; }
 
 	/// Returns the name of an item in the collection.
 	template<typename T>
 	const std::string &get_name(T *d) const
 	{
-		typedef RefPtr<typename RemoveConst<T>::Type> RPNCT;
+		typedef RefPtr<typename std::remove_cv<T>::type> RPNCT;
 
-		for(ItemMap::const_iterator i=items.begin(); i!=items.end(); ++i)
-			if(i->second.check_type<RPNCT>())
-				if(i->second.value<RPNCT>().get()==d)
-					return i->first;
+		for(const auto &kvp: items)
+			if(kvp.second.check_type<RPNCT>())
+				if(kvp.second.value<RPNCT>().get()==d)
+					return kvp.first;
 	
 		// XXX Need better exception class
 		throw std::runtime_error("Item not found in collection");
@@ -279,10 +298,6 @@ public:
 	object when done with it. */
 	IO::Seekable *open_raw(const std::string &) const;
 
-protected:
-	// Deprecated.  Use open_raw instead.
-	DEPRECATED IO::Seekable *open_from_sources(const std::string &n) { return open_raw(n); }
-
 private:
 	void gather_names_from_sources(std::list<std::string> &, const CollectionItemTypeBase &) const;
 
@@ -349,12 +364,13 @@ public:
 	virtual bool can_create() const = 0;
 	virtual void create_item(Collection &, const std::string &) const = 0;
 	virtual void load_item(Collection &, Parser &, const std::string &) const = 0;
+	virtual void notify_item(Collection &, const std::string &, const Variant &) const = 0;
 
 	template<typename T>
 	bool can_extract() const
 	{
-		for(std::vector<ExtractorBase *>::const_iterator i=extractors.begin(); i!=extractors.end(); ++i)
-			if(dynamic_cast<Extractor<T> *>(*i))
+		for(ExtractorBase *e: extractors)
+			if(dynamic_cast<Extractor<T> *>(e))
 				return true;
 		return false;
 	}
@@ -362,8 +378,8 @@ public:
 	template<typename T>
 	T *extract(const Variant &var) const
 	{
-		for(std::vector<ExtractorBase *>::const_iterator i=extractors.begin(); i!=extractors.end(); ++i)
-			if(Extractor<T> *ex = dynamic_cast<Extractor<T> *>(*i))
+		for(ExtractorBase *e: extractors)
+			if(Extractor<T> *ex = dynamic_cast<Extractor<T> *>(e))
 				return &ex->extract(var);
 		return 0;
 	}
@@ -398,6 +414,26 @@ private:
 		{ return (dynamic_cast<C &>(coll).*func)(name); }
 	};
 
+	struct NotifyeeBase
+	{
+		virtual ~NotifyeeBase() { }
+
+		virtual void notify(Collection &, const std::string &, T &) const = 0;
+	};
+
+	template<typename C>
+	struct Notifyee: NotifyeeBase
+	{
+		typedef void (C::*FuncPtr)(const std::string &, T &);
+
+		FuncPtr func;
+
+		Notifyee(FuncPtr f): func(f) { }
+
+		virtual void notify(Collection &coll, const std::string &name, T &item) const
+		{ (dynamic_cast<C &>(coll).*func)(name, item); }
+	};
+
 	template<typename B>
 	struct Extractor: CollectionItemTypeBase::Extractor<B>
 	{
@@ -406,6 +442,7 @@ private:
 	};
 
 	CreatorBase *creat;
+	std::vector<NotifyeeBase *> notif;
 
 public:
 	CollectionItemType():
@@ -415,6 +452,8 @@ public:
 	~CollectionItemType()
 	{
 		delete creat;
+		for(NotifyeeBase *n: notif)
+			delete n;
 	}
 
 	/** Sets a datafile keyword for this item type.  The Collection's loader
@@ -458,6 +497,13 @@ public:
 		return *this;
 	}
 
+	template<typename C>
+	CollectionItemType &notify(void (C::*func)(const std::string &, T &))
+	{
+		notif.push_back(new Notifyee<C>(func));
+		return *this;
+	}
+
 	virtual bool is_same_type(const CollectionItemTypeBase &other) const
 	{ return dynamic_cast<const CollectionItemType<T> *>(&other); }
 
@@ -483,6 +529,13 @@ public:
 	{
 		throw std::runtime_error("this type cannot be loaded");
 	}
+
+	virtual void notify_item(Collection &coll, const std::string &name, const Variant &var) const
+	{
+		RefPtr<T> obj = var.value<RefPtr<T> >();
+		for(NotifyeeBase *n: notif)
+			n->notify(coll, name, *obj);
+	}
 };
 
 
@@ -526,9 +579,9 @@ typename CollectionItemTypeChooser<T>::Type &Collection::add_type()
 template<typename T>
 typename CollectionItemTypeChooser<T>::Type &Collection::modify_type()
 {
-	for(TypeList::const_iterator j=types.begin(); j!=types.end(); ++j)
-		if(CollectionItemType<T> *t = dynamic_cast<CollectionItemType<T> *>(*j))
-			return *t;
+	for(CollectionItemTypeBase *t: types)
+		if(CollectionItemType<T> *tt = dynamic_cast<CollectionItemType<T> *>(t))
+			return *tt;
 
 	throw std::logic_error("type not found in collection");
 }
@@ -536,16 +589,16 @@ typename CollectionItemTypeChooser<T>::Type &Collection::modify_type()
 template<typename T>
 CollectionItemTypeBase *Collection::get_type(const std::string &name) const
 {
-	for(TypeList::const_iterator j=types.begin(); j!=types.end(); ++j)
-		if(dynamic_cast<CollectionItemType<T> *>(*j))
-			return *j;
+	for(CollectionItemTypeBase *t: types)
+		if(dynamic_cast<CollectionItemType<T> *>(t))
+			return t;
 	CollectionItemTypeBase *type = 0;
-	for(TypeList::const_iterator j=types.begin(); j!=types.end(); ++j)
-		if((*j)->can_extract<T>())
+	for(CollectionItemTypeBase *t: types)
+		if(t->can_extract<T>())
 		{
-			if(!name.empty() && (*j)->match_name(name))
-				return *j;
-			type = *j;
+			if(!name.empty() && t->match_name(name))
+				return t;
+			type = t;
 		}
 	return type;
 }