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 java.lang.reflect.Type;
  import java.math.BigDecimal;
  import java.util.Collections;
  import java.util.HashMap;
  import java.util.Map;
  import java.util.function.BiFunction;
  import java.util.function.Function;
  import org.openqa.selenium.internal.Require;
  
  class NumberCoercer<T extends Number> extends TypeCoercer<T> {
  
    private static final Map<Class<?>, Class<?>> PRIMITIVE_NUMBER_TYPES;
  
    static {
      Map<Class<?>, Class<?>> builder = new HashMap<>();
      builder.put(byte.class, Byte.class);
      builder.put(double.class, Double.class);
      builder.put(float.class, Float.class);
      builder.put(int.class, Integer.class);
      builder.put(long.class, Long.class);
      builder.put(short.class, Short.class);
  
      PRIMITIVE_NUMBER_TYPES = Collections.unmodifiableMap(builder);
    }
  
    private final Class<T> stereotype;
    private final Function<Number, T> mapper;
  
    NumberCoercer(Class<T> stereotype, Function<Number, T> mapper) {
      this.stereotype = Require.nonNull("Stereotype", stereotype);
      this.mapper = Require.nonNull("Mapper", mapper);
    }
  
    @Override
    public boolean test(Class<?> type) {
      return stereotype.isAssignableFrom(PRIMITIVE_NUMBER_TYPES.getOrDefault(type, type));
    }
  
    @Override
    public BiFunction<JsonInput, PropertySetting, T> apply(Type ignored) {
      return (jsonInput, setting) -> {
        Number number;
        switch (jsonInput.peek()) {
          case NUMBER:
            number = jsonInput.nextNumber();
            break;
  
          case STRING:
            try {
              number = new BigDecimal(jsonInput.nextString());
            } catch (NumberFormatException e) {
              throw new JsonException(e);
            }
            break;
  
          default:
            throw new JsonException("Unable to coerce to a number: " + jsonInput.peek());
        }
        return mapper.apply(number);
      };
    }
  }
  