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Mapbox GL Android SDK
There is a newer version: 9.2.1
package com.mapbox.mapboxsdk.maps;

import android.support.annotation.NonNull;
import android.support.annotation.Nullable;
import android.text.TextUtils;

import com.mapbox.mapboxsdk.annotations.InfoWindow;
import com.mapbox.mapboxsdk.annotations.Marker;

import java.util.ArrayList;
import java.util.List;

/**
 * Responsible for managing InfoWindows shown on the Map.
 * 
 * Maintains a {@link List} of opened {@link InfoWindow} and tracks configurations as
 * allowConcurrentMultipleInfoWindows which allows to have multiple {@link InfoWindow} open at the
 * same time. Responsible for managing listeners as
 * {@link com.mapbox.mapboxsdk.maps.MapboxMap.OnInfoWindowClickListener} and
 * {@link com.mapbox.mapboxsdk.maps.MapboxMap.OnInfoWindowLongClickListener}.
 * 
 */
class InfoWindowManager {

  private List infoWindows;
  private MapboxMap.InfoWindowAdapter infoWindowAdapter;
  private boolean allowConcurrentMultipleInfoWindows;

  private MapboxMap.OnInfoWindowClickListener onInfoWindowClickListener;
  private MapboxMap.OnInfoWindowLongClickListener onInfoWindowLongClickListener;
  private MapboxMap.OnInfoWindowCloseListener onInfoWindowCloseListener;

  InfoWindowManager() {
    this.infoWindows = new ArrayList<>();
  }

  void update() {
    for (InfoWindow infoWindow : infoWindows) {
      infoWindow.update();
    }
  }

  void setInfoWindowAdapter(@Nullable MapboxMap.InfoWindowAdapter infoWindowAdapter) {
    this.infoWindowAdapter = infoWindowAdapter;
  }

  MapboxMap.InfoWindowAdapter getInfoWindowAdapter() {
    return infoWindowAdapter;
  }

  void setAllowConcurrentMultipleOpenInfoWindows(boolean allow) {
    allowConcurrentMultipleInfoWindows = allow;
  }

  boolean isAllowConcurrentMultipleOpenInfoWindows() {
    return allowConcurrentMultipleInfoWindows;
  }

  List getInfoWindows() {
    return infoWindows;
  }

  boolean isInfoWindowValidForMarker(@NonNull Marker marker) {
    return !TextUtils.isEmpty(marker.getTitle()) || !TextUtils.isEmpty(marker.getSnippet());
  }

  void setOnInfoWindowClickListener(@Nullable MapboxMap.OnInfoWindowClickListener listener) {
    onInfoWindowClickListener = listener;
  }

  MapboxMap.OnInfoWindowClickListener getOnInfoWindowClickListener() {
    return onInfoWindowClickListener;
  }

  void setOnInfoWindowLongClickListener(@Nullable MapboxMap.OnInfoWindowLongClickListener listener) {
    onInfoWindowLongClickListener = listener;
  }

  MapboxMap.OnInfoWindowLongClickListener getOnInfoWindowLongClickListener() {
    return onInfoWindowLongClickListener;
  }

  void setOnInfoWindowCloseListener(@Nullable MapboxMap.OnInfoWindowCloseListener listener) {
    onInfoWindowCloseListener = listener;
  }

  MapboxMap.OnInfoWindowCloseListener getOnInfoWindowCloseListener() {
    return onInfoWindowCloseListener;
  }

  public void add(InfoWindow infoWindow) {
    infoWindows.add(infoWindow);
  }
}