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An implementation of darcy and darcy-web that uses Selenium WebDriver as the automation library backend.
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/*
 Copyright 2014 Red Hat, Inc. and/or its affiliates.

 This file is part of darcy-webdriver.

 This program is free software: you can redistribute it and/or modify
 it under the terms of the GNU General Public License as published by
 the Free Software Foundation, either version 3 of the License, or
 (at your option) any later version.

 This program is distributed in the hope that it will be useful,
 but WITHOUT ANY WARRANTY; without even the implied warranty of
 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 GNU General Public License for more details.

 You should have received a copy of the GNU General Public License
 along with this program.  If not, see .
 */

package com.redhat.darcy.webdriver.locators;

import com.redhat.darcy.ui.api.Locator;
import com.redhat.darcy.webdriver.ElementConstructorMap;
import com.redhat.darcy.webdriver.WebDriverElementContext;
import com.redhat.darcy.webdriver.elements.WebDriverElement;
import com.redhat.darcy.webdriver.internal.DefaultWebDriverElementContext;

import org.openqa.selenium.By;
import org.openqa.selenium.SearchContext;
import org.openqa.selenium.WebElement;

import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import java.util.Objects;
import java.util.stream.Collectors;

public class ByChained extends By {
    private Locator[] locators;

    private static final ElementConstructorMap elMap = ElementConstructorMap.webDriverElementOnly();

    public ByChained(Locator... locators) {
        this.locators = Objects.requireNonNull(locators, "locators");

        if(locators.length == 0) {
            throw new IllegalArgumentException("Must pass at least 1 locator, but instead got an "
                    + "empty array.");
        }
    }

    @Override
    public List findElements(SearchContext context) {
        List found = null;
        List children = new ArrayList<>();

        WebDriverElementContext nestedContext = getNestedContext(context);

        for (Locator locator : locators) {
            if (found == null) {
                found = new ArrayList<>(locator.findAll(WebDriverElement.class, nestedContext));
            } else {
                for (WebDriverElement parent : found) {
                    nestedContext = getNestedContext(parent.getWrappedElement());
                    children.addAll(locator.findAll(WebDriverElement.class, nestedContext));
                }

                found.clear();
                found.addAll(children);
                children.clear();
            }
        }

        return found.stream()
                .map(WebDriverElement::getWrappedElement)
                .collect(Collectors.toList());
    }

    @Override
    public String toString() {
        return "ByChained: {locators: " + Arrays.toString(locators) + "}";
    }

    private WebDriverElementContext getNestedContext(SearchContext sc) {
        return new DefaultWebDriverElementContext(sc, elMap);
    }
}