com.google.guava4pingcap.reflect.TypeParameter Maven / Gradle / Ivy
/*
* Copyright (C) 2011 The Guava Authors
*
* 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.google.guava4pingcap.reflect;
import static com.google.guava4pingcap.base.Preconditions.checkArgument;
import com.google.guava4pingcap.annotations.Beta;
import java.lang.reflect.Type;
import java.lang.reflect.TypeVariable;
import javax.annotation.Nullable;
/**
* Captures a free type variable that can be used in {@link TypeToken#where}.
* For example:
*
* {@code
* static TypeToken> listOf(Class elementType) {
* return new TypeToken>() {}
* .where(new TypeParameter() {}, elementType);
* }}
*
* @author Ben Yu
* @since 12.0
*/
@Beta
public abstract class TypeParameter extends TypeCapture {
final TypeVariable typeVariable;
protected TypeParameter() {
Type type = capture();
checkArgument(type instanceof TypeVariable, "%s should be a type variable.", type);
this.typeVariable = (TypeVariable) type;
}
@Override public final int hashCode() {
return typeVariable.hashCode();
}
@Override public final boolean equals(@Nullable Object o) {
if (o instanceof TypeParameter) {
TypeParameter that = (TypeParameter) o;
return typeVariable.equals(that.typeVariable);
}
return false;
}
@Override public String toString() {
return typeVariable.toString();
}
}