package com.atlassian.webtest.ui.keys;
   
   import java.util.Collection;
   import java.util.EnumSet;
   import java.util.Set;
   
   import static com.google.common.base.Preconditions.checkNotNull;
   
   /**
   * Abstract implementation of the {@link com.atlassian.webtest.ui.keys.KeySequence} interface and its accompanying
   * interfaces.
   *
   * @since v1.21
   */
  public abstract class AbstractKeySequence implements KeySequence, TypeModeAware, KeyEventAware
  {
  
      private final EnumSet<ModifierKey> toPress;
      private final EnumSet<KeyEventType> keyEvents;
      private final TypeMode typeMode;
  
  
      public AbstractKeySequence(TypeMode typeMode, Collection<ModifierKey> toPress, Collection<KeyEventType> events)
      {
          this.toPress = toEnumSet(toPress, ModifierKey.class);
          this.keyEvents = toEnumSet(events, KeyEventType.class);
          this.typeMode = checkNotNull(typeMode, "typeMode");
      }
  
      private <E extends Enum<E>> EnumSet<E> toEnumSet(Collection<E> toPress, Class<E> enumType)
      {
          if (toPress instanceof EnumSet<?>)
          {
              return EnumSet.copyOf((EnumSet<E>) toPress);
          }
          return toPress.size() == 0 ? EnumSet.noneOf(enumType) : EnumSet.copyOf(toPress);
      }
  
  
      public final Set<ModifierKey> withPressed()
      {
          return toPress;
      }
  
      public final Set<KeyEventType> keyEvents()
      {
          return keyEvents;
      }
  
      public final TypeMode typeMode()
      {
          return typeMode;
      }
  }