Changes:

[phpeclipse.git] / net.sourceforge.phpeclipse / src / net / sourceforge / phpdt / internal / core / util / PerThreadObject.java

diff --git a/net.sourceforge.phpeclipse/src/net/sourceforge/phpdt/internal/core/util/PerThreadObject.java b/net.sourceforge.phpeclipse/src/net/sourceforge/phpdt/internal/core/util/PerThreadObject.java
new file mode 100644 (file)
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+++ b/net.sourceforge.phpeclipse/src/net/sourceforge/phpdt/internal/core/util/PerThreadObject.java
@@ -0,0 +1,41 @@
+/*******************************************************************************
+ * Copyright (c) 2000, 2003 IBM Corporation and others.
+ * All rights reserved. This program and the accompanying materials 
+ * are made available under the terms of the Common Public License v1.0
+ * which accompanies this distribution, and is available at
+ * http://www.eclipse.org/legal/cpl-v10.html
+ * 
+ * Contributors:
+ *     IBM Corporation - initial API and implementation
+ *******************************************************************************/
+package net.sourceforge.phpdt.internal.core.util;
+
+import java.util.Hashtable;
+
+/**
+ * Implementation of data structure remembering an Object value by thread. Its purpose is to ease
+ * writing multi-threaded algorithms by providing a per thread data structure.
+ */
+public class PerThreadObject {
+
+       private Hashtable internalMap = new Hashtable(3); // synchronized map
+       
+       /**
+        * Answer the current map for this thread
+        */
+       public Object getCurrent(){
+               return this.internalMap.get(Thread.currentThread());
+       }
+       
+       /**
+        * Set the map for this current thread - setting to null is equivalent to removing it
+        */
+       public void setCurrent(Object current){
+               if (current == null){
+                       this.internalMap.remove(Thread.currentThread());                        
+               } else {
+                       this.internalMap.put(Thread.currentThread(), current);
+               }
+       }
+}
+