1 /* 2 * Copyright (C) 2014 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 package android.hardware.cts.helpers.sensorverification; 18 19 import junit.framework.Assert; 20 21 import android.hardware.cts.helpers.TestSensorEvent; 22 23 /** 24 * Abstract class that calculates of the mean event values. 25 */ 26 public abstract class AbstractMeanVerification extends AbstractSensorVerification { 27 private float[] mSums = null; 28 private int mCount = 0; 29 30 /** 31 * {@inheritDoc} 32 */ 33 @Override 34 protected void addSensorEventInternal(TestSensorEvent event) { 35 if (mSums == null) { 36 mSums = new float[event.values.length]; 37 } 38 Assert.assertEquals(mSums.length, event.values.length); 39 for (int i = 0; i < mSums.length; i++) { 40 mSums[i] += event.values[i]; 41 } 42 mCount++; 43 } 44 45 /** 46 * Return the number of events. 47 */ 48 protected int getCount() { 49 return mCount; 50 } 51 52 /** 53 * Return the means of the event values. 54 */ 55 protected float[] getMeans() { 56 if (mCount < 0) { 57 return null; 58 } 59 60 float[] means = new float[mSums.length]; 61 for (int i = 0; i < mSums.length; i++) { 62 means[i] = mSums[i] / mCount; 63 } 64 return means; 65 } 66 } 67
