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package com.mapbox.mapboxsdk.location;
import android.os.Handler;
import android.os.Message;
import android.support.annotation.NonNull;
import java.lang.ref.WeakReference;
/**
* Class controls the location stale state when the {@link android.location.Location} hasn't
* been updated in 'x' amount of time. {@link LocationComponentOptions#staleStateTimeout()} can be used to
* control the amount of time before the location's considered stale.
* {@link LocationComponentOptions#enableStaleState()} is available for disabling this behaviour.
*/
class StaleStateManager {
private boolean isEnabled;
private final OnLocationStaleListener innerOnLocationStaleListeners;
@NonNull
private final StaleMessageHandler handler;
private boolean isStale = true;
private long delayTime;
private final int staleStateMessage = 1;
StaleStateManager(OnLocationStaleListener innerListener, LocationComponentOptions options) {
innerOnLocationStaleListeners = innerListener;
handler = new StaleMessageHandler(this);
isEnabled = options.enableStaleState();
delayTime = options.staleStateTimeout();
}
void setEnabled(boolean enabled) {
if (enabled) {
setState(isStale);
} else if (isEnabled) {
onStop();
innerOnLocationStaleListeners.onStaleStateChange(false);
}
isEnabled = enabled;
}
boolean isStale() {
return isStale;
}
void updateLatestLocationTime() {
setState(false);
postTheCallback();
}
void setDelayTime(long delayTime) {
this.delayTime = delayTime;
if (handler.hasMessages(staleStateMessage)) {
postTheCallback();
}
}
void onStart() {
if (!isStale) {
postTheCallback();
}
}
void onStop() {
handler.removeCallbacksAndMessages(null);
}
private void postTheCallback() {
handler.removeCallbacksAndMessages(null);
handler.sendEmptyMessageDelayed(staleStateMessage, delayTime);
}
private void setState(boolean stale) {
if (stale != isStale) {
isStale = stale;
if (isEnabled) {
innerOnLocationStaleListeners.onStaleStateChange(stale);
}
}
}
private static class StaleMessageHandler extends Handler {
private final WeakReference<StaleStateManager> managerWeakReference;
private StaleMessageHandler(StaleStateManager staleStateManager) {
this.managerWeakReference = new WeakReference<>(staleStateManager);
}
@Override
public void handleMessage(Message msg) {
StaleStateManager manager = managerWeakReference.get();
if (manager != null) {
manager.setState(true);
}
}
}
}
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