content: /*
   * Created on Dec 16, 2012
   * 
   * 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 @2012-2013 the original author or authors.
   */
  package org.fest.reflect.util;
  
  import org.jetbrains.annotations.NotNull;
  import org.jetbrains.annotations.Nullable;
  import java.util.Map;
  
  import static org.fest.util.Maps.newHashMap;
  import static org.fest.util.Preconditions.checkNotNull;
  
  /**
   * Utility methods related to Java types.
   *
   * @author Alex Ruiz
   */
  public final class Types {
    private static final Map<Class<?>, Class<?>> PRIMITIVE_TO_WRAPPER_TYPE = newHashMap();
  
    static {
      boolean.class.isPrimitive();
      PRIMITIVE_TO_WRAPPER_TYPE.put(boolean.class, Boolean.class);
      PRIMITIVE_TO_WRAPPER_TYPE.put(byte.class, Byte.class);
      PRIMITIVE_TO_WRAPPER_TYPE.put(short.class, Short.class);
      PRIMITIVE_TO_WRAPPER_TYPE.put(int.class, Integer.class);
      PRIMITIVE_TO_WRAPPER_TYPE.put(long.class, Long.class);
      PRIMITIVE_TO_WRAPPER_TYPE.put(float.class, Float.class);
      PRIMITIVE_TO_WRAPPER_TYPE.put(double.class, Double.class);
      PRIMITIVE_TO_WRAPPER_TYPE.put(char.class, Character.class);
    }
  
    private Types() {
    }
  
    /**
     * Casts the given object to the given type. This method handles primitive types properly.
     *
     * @param o    the object to cast.
     * @param type the type to cast the given object to.
     * @return the given object casted to the given type.
     */
    public static <T> T castSafely(@Nullable Object o, @NotNull Class<T> type) {
      checkNotNull(type);
      if (type.isPrimitive()) {
        return getWrapperType(type).cast(o);
      }
      return type.cast(o);
    }
  
    @SuppressWarnings("unchecked")
    private static @NotNull <T> Class<T> getWrapperType(@NotNull Class<T> primitiveClass) {
      checkNotNull(primitiveClass);
      if (!primitiveClass.isPrimitive()) {
        String msg = String.format("The class %s is not a primitive type", primitiveClass.getName());
        throw new IllegalArgumentException(msg);
      }
      return (Class<T>) checkNotNull(PRIMITIVE_TO_WRAPPER_TYPE.get(primitiveClass));
    }
  }
  