From 79ebc066bb2b34f05ea471cc627c7387add93d0a Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Andr=C3=A9=20Wolski?= <andre.wolski@arcadis.com>
Date: Tue, 11 Apr 2017 09:24:58 +0200
Subject: [PATCH] add NanoTimeFunctionElement

- provides System.nanoTime to measure elapsed time
---
 .../plugins/time/NanoTimeFunctionElement.java | 50 +++++++++++++++++++
 .../engine/plugins/time/TimePlugin.java       |  3 +-
 2 files changed, 52 insertions(+), 1 deletion(-)
 create mode 100644 org.coreasm.engine/src/org/coreasm/engine/plugins/time/NanoTimeFunctionElement.java

diff --git a/org.coreasm.engine/src/org/coreasm/engine/plugins/time/NanoTimeFunctionElement.java b/org.coreasm.engine/src/org/coreasm/engine/plugins/time/NanoTimeFunctionElement.java
new file mode 100644
index 00000000..f90298e1
--- /dev/null
+++ b/org.coreasm.engine/src/org/coreasm/engine/plugins/time/NanoTimeFunctionElement.java
@@ -0,0 +1,50 @@
+/*	
+ * NanoTimeFunctionElement.java 	1.0
+ * 
+ * Copyright (C) 2006 Roozbeh Farahbod
+ *
+ * Last modified by $Author: rfarahbod $ on $Date: 2011-03-29 02:05:21 +0200 (Di, 29 Mrz 2011) $.
+ *
+ * Licensed under the Academic Free License version 3.0
+ *   http://www.opensource.org/licenses/afl-3.0.php
+ *   http://www.coreasm.org/afl-3.0.php
+ *
+ */
+ 
+package org.coreasm.engine.plugins.time;
+
+import org.coreasm.engine.absstorage.Element;
+import org.coreasm.engine.absstorage.FunctionElement;
+import org.coreasm.engine.plugins.number.NumberElement;
+
+import java.util.List;
+
+/** 
+ * Implements 'nanoTime' as a monitored function that returns the current value of the running Java Virtual Machine's
+ *         high-resolution time source, in nanoseconds.
+ *   
+ * @author  André Wolski
+ * 
+ */
+public class NanoTimeFunctionElement extends FunctionElement {
+
+	/** Name of this function */
+	public static final String NANOTIME_FUNC_NAME = "nanoTime";
+
+	public NanoTimeFunctionElement() {
+		super();
+		setFClass(FunctionClass.fcMonitored);
+	}
+
+	/* (non-Javadoc)
+	 * @see org.coreasm.engine.absstorage.FunctionElement#getValue(java.util.List)
+	 */
+	@Override
+	public Element getValue(List<? extends Element> args) {
+		if (args.size() > 0) 
+			return Element.UNDEF;
+		else
+			return NumberElement.getInstance(System.nanoTime());
+	}
+
+}
diff --git a/org.coreasm.engine/src/org/coreasm/engine/plugins/time/TimePlugin.java b/org.coreasm.engine/src/org/coreasm/engine/plugins/time/TimePlugin.java
index 81c35c4b..c95fcc21 100644
--- a/org.coreasm.engine/src/org/coreasm/engine/plugins/time/TimePlugin.java
+++ b/org.coreasm.engine/src/org/coreasm/engine/plugins/time/TimePlugin.java
@@ -37,7 +37,7 @@
  */
 public class TimePlugin extends Plugin implements VocabularyExtender {
 
-	public static final VersionInfo VERSION_INFO = new VersionInfo(0, 2, 0, "");
+	public static final VersionInfo VERSION_INFO = new VersionInfo(0, 3, 0, "");
 	
 	private final Set<String> dependencyList;
 	
@@ -75,6 +75,7 @@ public Map<String,FunctionElement> getFunctions() {
 		if (functions == null) {
 			functions = new HashMap<String,FunctionElement>();
 			functions.put(NowFunctionElement.NOW_FUNC_NAME, new NowFunctionElement());
+			functions.put(NanoTimeFunctionElement.NANOTIME_FUNC_NAME, new NanoTimeFunctionElement());
 			functions.put(StepCountFunctionElement.FUNC_NAME, new StepCountFunctionElement(capi));
 		}
 		return functions;