/*
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* Copyright 2017 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package com.android.server.wifi;
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import android.net.wifi.ScanResult;
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import java.util.Collection;
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/**
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* Evaluates ScanResults for Wifi Wake.
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*/
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public class WakeupEvaluator {
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private final ScoringParams mScoringParams;
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WakeupEvaluator(ScoringParams scoringParams) {
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mScoringParams = scoringParams;
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}
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/**
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* Searches ScanResults to find a connectable network.
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*
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* <p>This method searches the given ScanResults for one that is present in the given
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* ScanResultMatchInfos and has a sufficiently high RSSI. If there is no such ScanResult, it
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* returns null. If there are multiple, it returns the one with the highest RSSI.
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*
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* @param scanResults ScanResults to search
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* @param networks Network list to compare against
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* @return The {@link ScanResult} representing an in-range connectable network, or {@code null}
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* signifying there is no viable network
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*/
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public ScanResult findViableNetwork(Collection<ScanResult> scanResults,
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Collection<ScanResultMatchInfo> networks) {
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ScanResult selectedScanResult = null;
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for (ScanResult scanResult : scanResults) {
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if (isBelowThreshold(scanResult)) {
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continue;
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}
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if (networks.contains(ScanResultMatchInfo.fromScanResult(scanResult))) {
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if (selectedScanResult == null || selectedScanResult.level < scanResult.level) {
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selectedScanResult = scanResult;
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}
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}
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}
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return selectedScanResult;
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}
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/**
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* Returns whether the given ScanResult's signal strength is below the selection threshold.
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*/
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public boolean isBelowThreshold(ScanResult scanResult) {
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return scanResult.level < mScoringParams.getEntryRssi(scanResult.frequency);
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}
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}
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