code: // Licensed to the Software Freedom Conservancy (SFC) under one
  // or more contributor license agreements.  See the NOTICE file
  // distributed with this work for additional information
  // regarding copyright ownership.  The SFC licenses this file
  // to you 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 org.openqa.selenium.remote;
  
  import static java.util.Collections.singletonMap;
  import static org.openqa.selenium.remote.Dialect.W3C;
  import static org.openqa.selenium.remote.DriverCommand.FIND_ELEMENTS_FROM_SHADOW_ROOT;
  import static org.openqa.selenium.remote.DriverCommand.FIND_ELEMENT_FROM_SHADOW_ROOT;
  
  import java.util.List;
  import java.util.Map;
  import org.openqa.selenium.By;
  import org.openqa.selenium.SearchContext;
  import org.openqa.selenium.WebDriver;
  import org.openqa.selenium.WebElement;
  import org.openqa.selenium.WrapsDriver;
  import org.openqa.selenium.internal.Require;
  
  // Note: we want people to code against the SearchContext API, so we keep this class package private
  class ShadowRoot implements SearchContext, WrapsDriver {
    private final RemoteWebDriver parent;
    private final String id;
  
    ShadowRoot(RemoteWebDriver parent, String id) {
      this.parent = Require.nonNull("Owning remote webdriver", parent);
      this.id = Require.nonNull("Shadow root ID", id);
    }
  
    @Override
    public List<WebElement> findElements(By by) {
      return parent.findElements(
          this,
          (using, value) -> FIND_ELEMENTS_FROM_SHADOW_ROOT(id, using, String.valueOf(value)),
          by);
    }
  
    @Override
    public WebElement findElement(By by) {
      return parent.findElement(
          this,
          (using, value) -> FIND_ELEMENT_FROM_SHADOW_ROOT(id, using, String.valueOf(value)),
          by);
    }
  
    @Override
    public WebDriver getWrappedDriver() {
      return parent;
    }
  
    public String getId() {
      return this.id;
    }
  
    private Map<String, Object> toJson() {
      return singletonMap(W3C.getShadowRootElementKey(), id);
    }
  }
  