content: /*
   * Created on May 21, 2009
   * 
   * 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.
   * 
   * Copyright @2009-2013 the original author or authors.
   */
  package org.fest.swing.keystroke;
  
  import static org.fest.util.Maps.newHashMap;
  
  import java.util.Map;
  
  import javax.annotation.Nonnull;
  import javax.annotation.Nullable;
  import javax.swing.KeyStroke;
  
  /**
   * Mapping between characters and {@code KeyStroke}s.
   * 
   * @author Alex Ruiz
   */
  class KeyStrokeMapCollection {
    private final Map<Character, KeyStroke> charToKeyStroke = newHashMap();
    private final Map<KeyStroke, Character> keyStrokeToChar = newHashMap();
  
    void add(@Nonnull Character character, @Nonnull KeyStroke keyStroke) {
      charToKeyStroke.put(character, keyStroke);
      keyStrokeToChar.put(keyStroke, character);
    }
  
    void clear() {
      charToKeyStroke.clear();
      keyStrokeToChar.clear();
    }
  
    boolean isEmpty() {
      return charToKeyStroke.isEmpty() && keyStrokeToChar.isEmpty();
    }
  
    @Nullable KeyStroke keyStrokeFor(char character) {
      return charToKeyStroke.get(character);
    }
  
    @Nullable Character charFor(KeyStroke keyStroke) {
      return keyStrokeToChar.get(keyStroke);
    }
  }
  