code: // 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.interactions;
  
  import java.util.HashMap;
  import java.util.Map;
  import java.util.Optional;
  import java.util.UUID;
  
  /**
   * Models a <a href="https://www.w3.org/TR/webdriver/#dfn-key-input-source">key input source</a>.
   */
  public class KeyInput implements InputSource, Encodable {
  
    private final String name;
  
    public KeyInput(String name) {
      this.name = Optional.ofNullable(name).orElse(UUID.randomUUID().toString());
    }
  
    @Override
    public String getName() {
      return this.name;
    }
  
    @Override
    public SourceType getInputType() {
      return SourceType.KEY;
    }
  
    public Interaction createKeyDown(int codePoint) {
      return new TypingInteraction(this, "keyDown", codePoint);
    }
  
    public Interaction createKeyUp(int codePoint) {
      return new TypingInteraction(this, "keyUp", codePoint);
    }
  
    @Override
    public Map<String, Object> encode() {
      Map<String, Object> toReturn = new HashMap<>();
  
      toReturn.put("type", getInputType().getType());
      toReturn.put("id", name);
  
      return toReturn;
    }
  
    private static class TypingInteraction extends Interaction implements Encodable {
  
      private final String type;
      private final String value;
  
      TypingInteraction(InputSource source, String type, int codePoint) {
        super(source);
  
        this.type = type;
        this.value = new StringBuilder().appendCodePoint(codePoint).toString();
      }
  
      @Override
      public Map<String, Object> encode() {
        HashMap<String, Object> toReturn = new HashMap<>();
  
        toReturn.put("type", type);
        toReturn.put("value", value);
  
        return toReturn;
      }
    }
  }
  