content: /*
   * Licensed to the Apache Software Foundation (ASF) under one
   * or more contributor license agreements.  See the NOTICE file
   * distributed with this work for additional information
   * regarding copyright ownership.  The ASF 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 com.datastax.oss.driver.api.core.type.reflect;
  
  import com.datastax.oss.driver.shaded.guava.common.base.Preconditions;
  import edu.umd.cs.findbugs.annotations.NonNull;
  import java.lang.reflect.ParameterizedType;
  import java.lang.reflect.Type;
  import java.lang.reflect.TypeVariable;
  import net.jcip.annotations.Immutable;
  
  /**
   * Captures a free type variable that can be used in {@link GenericType#where(GenericTypeParameter,
   * GenericType)}.
   */
  @Immutable
  @SuppressWarnings("unused") // for T (unfortunately has to cover the whole class)
  public class GenericTypeParameter<T> {
    private final TypeVariable<?> typeVariable;
  
    protected GenericTypeParameter() {
      Type superclass = getClass().getGenericSuperclass();
      Preconditions.checkArgument(
          superclass instanceof ParameterizedType, "%s isn't parameterized", superclass);
      this.typeVariable =
          (TypeVariable<?>) ((ParameterizedType) superclass).getActualTypeArguments()[0];
    }
  
    @NonNull
    public TypeVariable<?> getTypeVariable() {
      return typeVariable;
    }
  }
  