Added generic Cache classes.

src/fr/devinsy/xidyn/utils/cache/Cache.java

@@ -0,0 +1,174 @@
+/**
+ * Copyright (C) 2016 Christian Pierre MOMON
+ * 
+ * This file is part of Xidyn.
+ * 
+ * Xidyn is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ * 
+ * Xidyn 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 Lesser General Public License for more details.
+ * 
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with Xidyn.  If not, see <http://www.gnu.org/licenses/>
+ */
+package fr.devinsy.xidyn.utils.cache;
+
+import java.util.HashMap;
+import java.util.Map;
+
+import fr.devinsy.xidyn.utils.cache.CacheStrategy.Strategy;
+
+/**
+ *
+ */
+public class Cache<T>
+{
+	private CacheStrategy strategy;
+	private Map<Object, CacheItem<T>> map;
+
+	/**
+	 * 
+	 */
+	public Cache()
+	{
+		this.strategy = new CacheStrategy(Strategy.NONE, 0);
+		this.map = new HashMap<Object, CacheItem<T>>();
+	}
+
+	/**
+	 * 
+	 */
+	public Cache(final int initialCapacity)
+	{
+		this.strategy = new CacheStrategy(Strategy.NONE, 0);
+		this.map = new HashMap<Object, CacheItem<T>>(initialCapacity);
+	}
+
+	/**
+	 * 
+	 */
+	public void clear()
+	{
+		this.map.clear();
+	}
+
+	/**
+	 * 
+	 * @param key
+	 * @return
+	 * @throws Exception
+	 */
+	public T get(final Object key)
+	{
+		T result;
+
+		CacheItem<T> item = this.map.get(key);
+
+		if (item == null)
+		{
+			result = null;
+		}
+		else
+		{
+			result = item.getValue();
+		}
+
+		//
+		return result;
+	}
+
+	/**
+	 * 
+	 * @return
+	 */
+	public boolean isEmpty()
+	{
+		boolean result;
+
+		result = this.map.isEmpty();
+
+		//
+		return result;
+	}
+
+	/**
+	 * 
+	 */
+	public void purge()
+	{
+		switch (this.strategy.getStrategy())
+		{
+			case NONE:
+			{
+			}
+			break;
+
+			case SIZE:
+			{
+				if (this.map.size() > this.strategy.getParameter())
+				{
+					// TODO
+				}
+			}
+			break;
+
+			case TIME:
+			{
+				// TODO
+			}
+			break;
+		}
+	}
+
+	/**
+	 * 
+	 * @param source
+	 * @return
+	 */
+	public T put(final Object key, final T source)
+	{
+		T result;
+
+		if (source != null)
+		{
+			CacheItem<T> item = this.map.get(key);
+
+			if (item == null)
+			{
+				purge();
+				item = new CacheItem<T>(source);
+				this.map.put(key, item);
+			}
+			else
+			{
+				item.setValue(source);
+			}
+		}
+
+		result = source;
+
+		//
+		return result;
+	}
+
+	/**
+	 * 
+	 * @return
+	 */
+	public int size()
+	{
+		int result;
+
+		result = this.map.size();
+
+		//
+		return result;
+	}
+}
+
+// ////////////////////////////////////////////////////////////////////////

src/fr/devinsy/xidyn/utils/cache/CacheItem.java

@@ -0,0 +1,127 @@
+/**
+ * Copyright (C) 2016 Christian Pierre MOMON
+ * 
+ * This file is part of Xidyn.
+ * 
+ * Xidyn is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ * 
+ * Xidyn 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 Lesser General Public License for more details.
+ * 
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with Xidyn.  If not, see <http://www.gnu.org/licenses/>
+ */
+package fr.devinsy.xidyn.utils.cache;
+
+import java.util.Date;
+
+/**
+ *
+ */
+public class CacheItem<T>
+{
+	private T value;
+	private long creationDate;
+	private long editionDate;
+	private long accessDate;
+
+	/**
+	 * 
+	 * @param source
+	 */
+	public CacheItem(final T source)
+	{
+		this.value = source;
+		this.creationDate = time();
+		this.editionDate = this.creationDate;
+		this.accessDate = this.creationDate;
+	}
+
+	/**
+	 * 
+	 * @return
+	 */
+	public long accessDate()
+	{
+		long result;
+
+		result = this.accessDate;
+
+		//
+		return result;
+	}
+
+	/**
+	 * 
+	 * @return
+	 */
+	public long creationDate()
+	{
+		long result;
+
+		result = this.creationDate;
+
+		//
+		return result;
+	}
+
+	/**
+	 * 
+	 * @return
+	 */
+	public long editionDate()
+	{
+		long result;
+
+		result = this.editionDate;
+
+		//
+		return result;
+	}
+
+	/**
+	 * 
+	 * @return
+	 */
+	public T getValue()
+	{
+		T result;
+
+		result = this.value;
+		this.accessDate = time();
+
+		//
+		return result;
+	}
+
+	/**
+	 * 
+	 * @param source
+	 */
+	public void setValue(final T source)
+	{
+		this.value = source;
+		this.editionDate = time();
+	}
+
+	/**
+	 * 
+	 * @return
+	 */
+	private static long time()
+	{
+		long result;
+
+		result = new Date().getTime();
+
+		//
+		return result;
+	}
+}
+
+// ////////////////////////////////////////////////////////////////////////

src/fr/devinsy/xidyn/utils/cache/CacheStrategy.java

@@ -0,0 +1,79 @@
+/**
+ * Copyright (C)2016 Christian Pierre MOMON
+ * 
+ * This file is part of Xidyn.
+ * 
+ * Xidyn is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ * 
+ * Xidyn 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 Lesser General Public License for more details.
+ * 
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with Xidyn.  If not, see <http://www.gnu.org/licenses/>
+ */
+package fr.devinsy.xidyn.utils.cache;
+
+/**
+ *
+ */
+public class CacheStrategy
+{
+	public enum Strategy
+	{
+		NONE,
+		SIZE,
+		TIME
+	}
+
+	private Strategy strategy;
+	private long parameter;
+
+	/**
+	 * 
+	 * @param strategy
+	 * @param parameter
+	 */
+	public CacheStrategy(final Strategy strategy, final long parameter)
+	{
+		if (strategy == null)
+		{
+			throw new IllegalArgumentException("Null strategy.");
+		}
+		else if (parameter < 0)
+		{
+			throw new IllegalArgumentException("Negative parameter.");
+		}
+		else
+		{
+			this.strategy = strategy;
+			this.parameter = parameter;
+		}
+	}
+
+	public long getParameter()
+	{
+		return this.parameter;
+	}
+
+	public Strategy getStrategy()
+	{
+		return this.strategy;
+	}
+
+	public void setParameter(final long parameter)
+	{
+		this.parameter = parameter;
+	}
+
+	public void setStrategy(final Strategy strategy)
+	{
+		this.strategy = strategy;
+	}
+}
+
+// ////////////////////////////////////////////////////////////////////////