com.datastax.oss.driver.api.core.type.reflect.GenericTypeParameter Maven / Gradle / Ivy
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/*
* 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 {
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;
}
}