1 files changed, 156 insertions, 0 deletions
diff --git a/ksvg/impl/libs/libtext2path/src/Cache.h b/ksvg/impl/libs/libtext2path/src/Cache.h
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+++ b/ksvg/impl/libs/libtext2path/src/Cache.h
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+/*
+    Copyright (C) 2003 Nikolas Zimmermann <wildfox@kde.org>
+    This file is part of the KDE project
+
+    This library is free software; you can redistribute it and/or
+    modify it under the terms of the GNU Library General Public
+    License as published by the Free Software Foundation; either
+    version 2 of the License, or (at your option) any later version.
+
+    This library is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+    Library General Public License for more details.
+
+    You should have received a copy of the GNU Library General Public License
+    aint with this library; see the file COPYING.LIB.  If not, write to
+    the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
+    Boston, MA 02110-1301, USA.
+*/
+
+#ifndef T2P_CACHE_H
+#define T2P_CACHE_H
+
+#include <map>
+#include <string>
+#include <vector>
+#include <iostream>
+
+#include "myboost/shared_ptr.hpp"
+
+namespace T2P
+{
+	class CacheElement
+	{
+	public:
+		CacheElement(std::string key) : m_key(key), m_usage(0) { }
+		~CacheElement() { }
+
+		std::string key() const { return m_key; }
+		int usage() const { return m_usage; }
+
+		void incUsage() { m_usage++; }
+
+	private:
+		std::string m_key;
+		int m_usage;
+	};
+	
+	template<typename T>
+	class Cache
+	{
+	public:
+		typedef myboost::shared_ptr<T> SharedT;
+
+		Cache(int maxSize = 10) : m_size(0), m_maxSize(maxSize) { }
+		~Cache() { clear(); }
+
+		// Number of elements in cache
+		int size() const { return m_size; }
+		
+		// Maximum number of elements in cache
+		int maxSize() const { return m_maxSize; } 
+		
+		// Add new entry
+		void insert(const std::string &key, SharedT &value)
+		{
+			// TODO: Add real LRU logic, now i will just delete the less
+			// used item when inserting a new item would exceed maxSize
+			if(m_size == m_maxSize)
+			{
+				// Find less used item
+				typename std::map<SharedT, CacheElement *>::const_iterator it = m_cacheMap.begin();
+				int usage = (*it).second->usage(); std::string keyUsage = (*it).second->key();
+				for(it++; it != m_cacheMap.end(); ++it)
+				{
+					int curUsage = (*it).second->usage();
+					if(curUsage < usage)
+					{
+						usage = curUsage;
+						keyUsage = (*it).second->key();
+					}						
+				}
+
+//				std::cout << "[CACHE] Removing less used element with key: " << keyUsage << " (Used " << usage << " times!)" << std::endl;
+				remove(keyUsage);
+			}
+			
+			m_size++;
+			m_entries.push_back(value);
+			m_cacheMap[value] = new CacheElement(key);
+		}
+		
+		// Remove single entry
+		void remove(const std::string &key)
+		{
+			for(typename std::vector<SharedT>::iterator it = m_entries.begin(); it != m_entries.end(); ++it)
+			{
+				SharedT cur = *it;
+				if(m_cacheMap[cur]->key() == key)
+				{
+					m_size--;
+
+					typename std::map<SharedT, CacheElement *>::iterator cacheElement = m_cacheMap.find(cur);
+					m_cacheMap.erase(cacheElement);
+					delete cacheElement->second;
+					m_entries.erase(it); // Only valid to write because we don't go on here!
+					break;				 //	Otherwhise the iterators _may_ be invalid!
+				}
+			}
+		}
+
+		// Remove all entries
+		void clear()
+		{
+			m_size = 0;
+			m_entries.clear();
+			m_cacheMap.clear();
+		}
+		
+		// Lookup entry
+		SharedT find(const std::string &key)
+		{
+			for(typename std::vector<SharedT>::const_iterator it = m_entries.begin(); it != m_entries.end(); ++it)
+			{
+				SharedT cur = *it;
+				if(m_cacheMap[cur]->key() == key)
+				{
+					m_cacheMap[cur]->incUsage();
+					return cur;
+				}
+			}
+
+			return SharedT();
+		}
+
+		void dump()
+		{
+			std::cout << "[CACHE] " << size() << " of " << maxSize() << " Objects in the cache." << std::endl;
+
+			for(typename std::vector<SharedT>::iterator it = m_entries.begin(); it != m_entries.end(); ++it)
+			{
+				SharedT cur = *it;
+				std::cout << "[CACHE] - " << m_cacheMap[cur]->key() << " -> " << cur << " (Usage: " << m_cacheMap[cur]->usage() << ")" << std::endl;
+			}
+		}
+
+	private:
+		std::vector<SharedT> m_entries;
+		std::map<SharedT, CacheElement *> m_cacheMap;
+		int m_size, m_maxSize;
+	};
+}
+
+#endif
+
+// vim:ts=4:noet