1 files changed, 92 insertions, 0 deletions
diff --git a/engine/src/core/com/jme3/system/NanoTimer.java b/engine/src/core/com/jme3/system/NanoTimer.java
new file mode 100644
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+++ b/engine/src/core/com/jme3/system/NanoTimer.java
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+/*
+ * Copyright (c) 2009-2010 jMonkeyEngine
+ * 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.
+ *
+ * * Neither the name of 'jMonkeyEngine' nor the names of its contributors
+ *   may be used to endorse or promote products derived from this software
+ *   without specific prior written permission.
+ *
+ * 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 OWNER 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.
+ */
+
+package com.jme3.system;
+
+/**
+ * <code>NanoTimer</code> is a System.nanoTime implementation of <code>Timer</code>.
+ * This is primarily useful for headless applications running on a server.
+ * 
+ * @author Matthew D. Hicks
+ */
+public class NanoTimer extends Timer {
+    
+    private static final long TIMER_RESOLUTION = 1000000000L;
+    private static final float INVERSE_TIMER_RESOLUTION = 1f/1000000000L;
+    
+    private long startTime;
+    private long previousTime;
+    private float tpf;
+    private float fps;
+    
+    public NanoTimer() {
+        startTime = System.nanoTime();
+    }
+
+    /**
+     * Returns the time in seconds. The timer starts
+     * at 0.0 seconds.
+     *
+     * @return the current time in seconds
+     */
+    @Override
+    public float getTimeInSeconds() {
+        return getTime() * INVERSE_TIMER_RESOLUTION;
+    }
+
+    public long getTime() {
+        return System.nanoTime() - startTime;
+    }
+
+    public long getResolution() {
+        return TIMER_RESOLUTION;
+    }
+
+    public float getFrameRate() {
+        return fps;
+    }
+
+    public float getTimePerFrame() {
+        return tpf;
+    }
+
+    public void update() {
+        tpf = (getTime() - previousTime) * (1.0f / TIMER_RESOLUTION);
+        fps = 1.0f / tpf;
+        previousTime = getTime();
+    }
+    
+    public void reset() {
+        startTime = System.nanoTime();
+        previousTime = getTime();
+    }
+}