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