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.json;
  
  import static org.openqa.selenium.json.Types.narrow;
  
  import java.lang.reflect.Type;
  import java.util.function.BiFunction;
  
  public class EnumCoercer<T extends Enum> extends TypeCoercer<T> {
  
    @Override
    public boolean test(Class<?> aClass) {
      return aClass.isEnum();
    }
  
    @Override
    public BiFunction<JsonInput, PropertySetting, T> apply(Type type) {
      Class<?> aClass = narrow(type);
      if (!aClass.isEnum()) {
        throw new JsonException("Type was not an enum: " + type);
      }
  
      return (jsonInput, setting) -> {
        String value = jsonInput.nextString();
  
        for (Object constant : aClass.getEnumConstants()) {
          if (constant.toString().equalsIgnoreCase(value)) {
            //noinspection unchecked
            return (T) constant;
          }
        }
  
        throw new JsonException(
            String.format("Unable to find matching enum value for %s in %s", value, aClass));
      };
    }
  }
  