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Selenium automates browsers. That's it! What you do with that power is entirely up to you.

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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 com.thoughtworks.selenium.webdriven;

import com.thoughtworks.selenium.SeleniumException;

import org.openqa.selenium.WebDriver;

public class Timer {
  private volatile long timeout;
  private boolean stopped;

  public Timer(long timeout) {
    this.timeout = timeout;
  }

  public  T run(SeleneseCommand command, WebDriver driver, String[] args) {
    if (stopped) {
      throw new IllegalStateException("Timer has already been stopped");
    }

    command.setDefaultTimeout(timeout);

    long start = System.currentTimeMillis();

    T value = command.apply(driver, args);

    long duration = System.currentTimeMillis() - start;

    if (duration > timeout) {
      throw new SeleniumException("Timed out waiting for action to finish");
    }

    return value;
  }

  public void setTimeout(long timeout) {
    this.timeout = timeout;
  }

  public void stop() {
    this.stopped = true;
  }
}