content: /*
   * Created on Jan 24, 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.reflect.reference;
  
  import org.fest.reflect.exception.ReflectionError;
  
  import org.jetbrains.annotations.NotNull;
  import java.lang.reflect.ParameterizedType;
  import java.lang.reflect.Type;
  
  import static org.fest.util.Preconditions.checkNotNull;
  
  /**
   * Allows usage of generics without the effects of
   * <a href="http://docs.oracle.com/javase/tutorial/java/generics/erasure.html" target="_blank">type erasure</a>. Based
   * on Neal Gafter's
   * {@code <a href="http://gafter.blogspot.com/2006/12/super-type-tokens.html" target="_blank">TypeReference</a>}.
   *
   * @param <T> the generic type in this reference.
   * @author crazybob@google.com (Bob Lee)
   * @author Alex Ruiz
   * @since 1.1
   */
  public abstract class TypeRef<T> {
    private final Class<T> rawType;
  
    /**
     * Creates a new {@link TypeRef}.
     *
     * @throws ReflectionError if the generic type of this reference is missing the type parameter.
     */
    @SuppressWarnings("unchecked")
    public TypeRef() {
      Type superclass = getClass().getGenericSuperclass();
      if (superclass instanceof Class<?>) {
        throw new ReflectionError("Missing type parameter.");
      }
      Type type = ((ParameterizedType) superclass).getActualTypeArguments()[0];
      rawType = type instanceof Class<?> ? (Class<T>) type : (Class<T>) ((ParameterizedType) type).getRawType();
      checkNotNull(rawType);
    }
  
    /**
     * @return the raw type of the generic type in this reference.
     */
    public final @NotNull Class<T> rawType() {
      return rawType;
    }
  }
  