X-Git-Url: https://git.dogcows.com/gitweb?p=chaz%2Fyoink;a=blobdiff_plain;f=src%2FMoof%2FLibrary.hh;fp=src%2FMoof%2FLibrary.hh;h=1d5af36c34b6f22cff945ad3e8be5bb9d6001434;hp=0000000000000000000000000000000000000000;hb=bffc879fc8ee8167bb123310d39fad4e2f426ffd;hpb=9619ed3cee0f9e465ad2747fcb4f1f6cb6d3d889

diff --git a/src/Moof/Library.hh b/src/Moof/Library.hh
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+
+/*******************************************************************************
+
+ Copyright (c) 2009, Charles McGarvey
+ All rights reserved.
+ 
+ Redistribution   and   use  in  source  and  binary  forms,  with  or  without
+ modification, are permitted provided that the following conditions are met:
+ 
+   * Redistributions  of  source  code  must retain the above copyright notice,
+     this list of conditions and the following disclaimer.
+   * Redistributions  in binary form must reproduce the above copyright notice,
+     this  list of conditions and the following disclaimer in the documentation
+     and/or other materials provided with the distribution.
+ 
+ THIS  SOFTWARE  IS  PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ AND  ANY  EXPRESS  OR  IMPLIED  WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ DISCLAIMED.  IN  NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+ FOR  ANY  DIRECT,  INDIRECT,  INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ DAMAGES  (INCLUDING,  BUT  NOT  LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ SERVICES;  LOSS  OF  USE,  DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+ CAUSED  AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ OR  TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+*******************************************************************************/
+
+#ifndef _MOOF_LIBRARY_HH_
+#define _MOOF_LIBRARY_HH_
+
+/**
+ * @file Library.hh
+ * A library is a collection of named objects of the same type.  Libraries use
+ * reference counting to automagically delete objects which no longer have any
+ * interested code.
+ */
+
+#include <memory>
+#include <string>
+
+#include <boost/shared_ptr.hpp>
+
+#include <Moof/Hash.hh>
+
+
+namespace Mf {
+
+
+template <class T>
+class Library
+{
+	typedef std::pair<unsigned,T*>							PtrValue;
+	typedef stlplus::hash<std::string,PtrValue,getHash>		PtrMap;
+
+	static PtrMap	mPtrMap;
+	std::string		mName;
+
+	static T* retain(const std::string& name)
+	{
+		typename PtrMap::iterator it = mPtrMap.find(name);
+
+		if (it != mPtrMap.end())
+		{
+			++((*it).second.first);
+			return (*it).second.second;
+		}
+		else
+		{
+			T* newObj(new T(name));
+			if (newObj)
+			{
+				mPtrMap.insert(std::make_pair(name, std::make_pair(1, newObj)));
+			}
+			return newObj; 
+		}
+	}
+
+	static void release(T* obj)
+	{
+		releaseByName(obj->mName);
+	}
+
+	static void releaseByName(const std::string& name)
+	{
+		typename PtrMap::iterator it;
+
+		if ((it = mPtrMap.find(name)) != mPtrMap.end() &&
+				--(*it).second.first == 0)
+		{
+			delete (*it).second.second;
+			mPtrMap.erase((*it).first);
+		}
+	}
+
+public:
+
+	explicit Library(const std::string& name) :
+		mName(name) {}
+
+	const std::string& getName() const
+	{
+		return mName;
+	}
+
+	static boost::shared_ptr<T> getInstance(const std::string& name)
+	{
+		return boost::shared_ptr<T>(retain(name), &release);
+	}
+};
+
+template <class T>
+stlplus::hash< std::string,std::pair<unsigned,T*>,getHash >
+	Library<T>::mPtrMap;
+
+
+} // namespace Mf
+
+#endif // _MOOF_LIBRARY_HH_
+
+/** vim: set ts=4 sw=4 tw=80: *************************************************/
+