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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
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package com.thoughtworks.selenium.webdriven.commands;

import com.thoughtworks.selenium.webdriven.ScriptMutator;
import com.thoughtworks.selenium.webdriven.SeleneseCommand;

import org.openqa.selenium.JavascriptExecutor;
import org.openqa.selenium.WebDriver;

/**
 * An implementation of the "getEval" method from Selenium.
 */
public class GetEval extends SeleneseCommand {
  private final ScriptMutator mutator;

  public GetEval(ScriptMutator mutator) {
    this.mutator = mutator;
  }

  @Override
  protected String handleSeleneseCommand(WebDriver driver, String locator, String value) {
    StringBuilder builder = new StringBuilder();

    mutator.mutate(locator, builder);

    Object result = ((JavascriptExecutor) driver).executeScript(builder.toString());
    return result == null ? "" : String.valueOf(result);
  }
}