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/*
Copyright 2007-2010 WebDriver committers
Copyright 2007-2010 Google Inc.

Licensed 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.internal.interactions;

import org.openqa.selenium.*;
import org.openqa.selenium.internal.interactions.KeysRelatedAction;

/**
 * Used both by KeyDownAction and KeyUpAction
 *
 */
public abstract class SingleKeyAction extends KeysRelatedAction {
  protected final Keys key;
  private static final Keys[] MODIFIER_KEYS = {Keys.SHIFT, Keys.CONTROL, Keys.ALT};

  protected SingleKeyAction(WebDriver parent, Keys key) {
    this(parent, null, key);
  }

  protected SingleKeyAction(WebDriver parent, WebElement toElement, Keys key) {
    super(parent, toElement);
    this.key = key;
    boolean isModifier = false;
    for (Keys modifier : MODIFIER_KEYS) {
      isModifier = isModifier | modifier.equals(key);
    }

    if (!isModifier) {
      throw new IllegalArgumentException("Key Down / Up events only make sense for modifier keys.");
    }

  }
}