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Diffstat (limited to 'src/demos/util/SystemTime.java')
-rw-r--r-- | src/demos/util/SystemTime.java | 110 |
1 files changed, 0 insertions, 110 deletions
diff --git a/src/demos/util/SystemTime.java b/src/demos/util/SystemTime.java deleted file mode 100644 index b6a154b..0000000 --- a/src/demos/util/SystemTime.java +++ /dev/null @@ -1,110 +0,0 @@ -/* - * Copyright (c) 2003 Sun Microsystems, Inc. All Rights Reserved. - * - * Redistribution and use in source and binary forms, with or without - * modification, are permitted provided that the following conditions are - * met: - * - * - Redistribution of source code must retain the above copyright - * notice, this list of conditions and the following disclaimer. - * - * - Redistribution 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 Sun Microsystems, Inc. or the names of - * contributors may be used to endorse or promote products derived from - * this software without specific prior written permission. - * - * This software is provided "AS IS," without a warranty of any kind. ALL - * EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND WARRANTIES, - * INCLUDING ANY IMPLIED WARRANTY OF MERCHANTABILITY, FITNESS FOR A - * PARTICULAR PURPOSE OR NON-INFRINGEMENT, ARE HEREBY EXCLUDED. SUN - * MICROSYSTEMS, INC. ("SUN") AND ITS LICENSORS SHALL NOT BE LIABLE FOR - * ANY DAMAGES SUFFERED BY LICENSEE AS A RESULT OF USING, MODIFYING OR - * DISTRIBUTING THIS SOFTWARE OR ITS DERIVATIVES. IN NO EVENT WILL SUN OR - * ITS LICENSORS BE LIABLE FOR ANY LOST REVENUE, PROFIT OR DATA, OR FOR - * DIRECT, INDIRECT, SPECIAL, CONSEQUENTIAL, INCIDENTAL OR PUNITIVE - * DAMAGES, HOWEVER CAUSED AND REGARDLESS OF THE THEORY OF LIABILITY, - * ARISING OUT OF THE USE OF OR INABILITY TO USE THIS SOFTWARE, EVEN IF - * SUN HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES. - * - * You acknowledge that this software is not designed or intended for use - * in the design, construction, operation or maintenance of any nuclear - * facility. - * - * Sun gratefully acknowledges that this software was originally authored - * and developed by Kenneth Bradley Russell and Christopher John Kline. - */ - -package demos.util; - -/** Implementation of {@link demos.util.Time} interface based - on {@link java.lang.System.currentTimeMillis}. Performs smoothing - internally to avoid effects of poor granularity of - currentTimeMillis on Windows platform in particular. */ - -public class SystemTime implements Time { - private static final int DEFAULT_NUM_SMOOTHING_SAMPLES = 10; - private long[] samples = new long[DEFAULT_NUM_SMOOTHING_SAMPLES]; - private int numSmoothingSamples; - private int curSmoothingSample; // Index of current sample to be replaced - private long baseTime = System.currentTimeMillis(); - private boolean hasCurTime; - private double curTime; - private double deltaT; - - /** Sets number of smoothing samples. Defaults to 10. Note that - there may be a discontinuity in the reported time after a call - to this method. */ - public void setNumSmoothingSamples(int num) { - samples = new long[num]; - numSmoothingSamples = 0; - curSmoothingSample = 0; - hasCurTime = false; - } - - /** Returns number of smoothing samples; default is 10. */ - public int getNumSmoothingSamples() { - return samples.length; - } - - /** Rebases this timer. After very long periods of time the - resolution of this timer may decrease; the application can call - this to restore higher resolution. Note that there may be a - discontinuity in the reported time after a call to this - method. */ - public void rebase() { - baseTime = System.currentTimeMillis(); - setNumSmoothingSamples(samples.length); - } - - public void update() { - long tmpTime = System.currentTimeMillis(); - long diffSinceBase = tmpTime - baseTime; - samples[curSmoothingSample] = diffSinceBase; - curSmoothingSample = (curSmoothingSample + 1) % samples.length; - numSmoothingSamples = Math.min(1 + numSmoothingSamples, samples.length); - // Average of samples is current time - double newCurTime = 0.0; - for (int i = 0; i < numSmoothingSamples; i++) { - newCurTime += samples[i]; - } - newCurTime /= (1000.0f * numSmoothingSamples); - double lastTime = curTime; - if (!hasCurTime) { - lastTime = newCurTime; - hasCurTime = true; - } - deltaT = newCurTime - lastTime; - curTime = newCurTime; - } - - public double time() { - return curTime; - } - - public double deltaT() { - return deltaT; - } -} |