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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.htmlunit;

import org.openqa.selenium.Keys;

/**
 * Holds the state of the modifier keys (Shift, ctrl, alt) for HtmlUnit.
 */
class KeyboardModifiersState {
  private boolean shiftPressed = false;
  private boolean ctrlPressed = false;
  private boolean altPressed = false;

  public boolean isShiftPressed() {
    return shiftPressed;
  }

  public boolean isCtrlPressed() {
    return ctrlPressed;
  }

  public boolean isAltPressed() {
    return altPressed;
  }

  public void storeKeyDown(CharSequence key) {
    storeIfEqualsShift(key, true);
    storeIfEqualsCtrl(key, true);
    storeIfEqualsAlt(key, true);
  }

  public void storeKeyUp(CharSequence key) {
    storeIfEqualsShift(key, false);
    storeIfEqualsCtrl(key, false);
    storeIfEqualsAlt(key, false);
  }

  private void storeIfEqualsShift(CharSequence key, boolean keyState) {
    if (key.equals(Keys.SHIFT))
      shiftPressed = keyState;
  }

  private void storeIfEqualsCtrl(CharSequence key, boolean keyState) {
    if (key.equals(Keys.CONTROL))
      ctrlPressed = keyState;
  }

  private void storeIfEqualsAlt(CharSequence key, boolean keyState) {
    if (key.equals(Keys.ALT))
      altPressed = keyState;
  }
}