/*
* Copyright DataStax, Inc.
*
* 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.
*/
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 GenericType.where(GenericTypeParameter, GenericType)
. /**
* 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;
}
}