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// 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.server.handler;

import com.google.common.base.Preconditions;

import org.openqa.selenium.WebDriver;
import org.openqa.selenium.internal.WrapsDriver;
import org.openqa.selenium.remote.SessionId;
import org.openqa.selenium.remote.server.KnownElements;
import org.openqa.selenium.remote.server.Session;
import org.openqa.selenium.remote.server.rest.RestishHandler;

import java.util.concurrent.Callable;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.FutureTask;

public abstract class WebDriverHandler implements RestishHandler, Callable {

  private final Session session;

  protected WebDriverHandler(Session session) {
    this.session = session;
  }

  @Override
  public final T handle() throws Exception {
    FutureTask future = new FutureTask<>(this);
    try {
      return getSession().execute(future);
    } catch (ExecutionException e) {
      Throwable cause = e.getCause();
      if (cause instanceof Exception)
        throw (Exception) cause;
      throw e;
    }
  }

  public SessionId getSessionId() {
    return session.getSessionId();
  }

  public String getScreenshot() {
    Session session = getSession();
    return session != null ? session.getAndClearScreenshot() : null;
  }

  protected WebDriver getDriver() {
    Session session = getSession();
    return session.getDriver();
  }

  protected Session getSession() {
    return session;
  }

  protected KnownElements getKnownElements() {
    return getSession().getKnownElements();
  }

  protected SessionId getRealSessionId() {
    return session == null ? new SessionId("unknown") : session.getSessionId();
  }

  protected BySelector newBySelector() {
    return new BySelector();
  }

  protected WebDriver getUnwrappedDriver() {
    WebDriver toReturn = getDriver();
    while (toReturn instanceof WrapsDriver) {
      toReturn = ((WrapsDriver) toReturn).getWrappedDriver();
    }
    return Preconditions.checkNotNull(toReturn);
  }
}