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package net.serenitybdd.screenplay.targets;

import org.openqa.selenium.WebDriver;
import org.openqa.selenium.WebElement;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.util.HashMap;
import java.util.Optional;

import static java.util.Optional.empty;

class IFrameSwitcher {

    private static final Logger LOGGER = LoggerFactory.getLogger(IFrameSwitcher.class);
    private final static ThreadLocal frameSwitcher = new ThreadLocal<>();
    private final HashMap> currentIFrames = new HashMap<>();

    static synchronized IFrameSwitcher getInstance() {
        IFrameSwitcher iFrameSwitcher = frameSwitcher.get();
        if (iFrameSwitcher == null) {
            iFrameSwitcher = new IFrameSwitcher();
            frameSwitcher.set(iFrameSwitcher);
        }
        return iFrameSwitcher;
    }

    private IFrameSwitcher() {}

    void switchToIFrame(WebDriver driver, final Target target) {
        if (!currentIFrames.containsKey(driver)) {
            currentIFrames.put(driver, empty());
        }
        Optional