/*
* Copyright 2013 Google Inc. All rights reserved.
*
* 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.errorprone.refaster;
import com.sun.tools.javac.code.Type;
import com.sun.tools.javac.code.Types;
import javax.annotation.Nullable;
/**
* A serializable representation of a type template, used for enforcing type constraints on target
* ASTs.
*
* @author Louis Wasserman
*/
public abstract class UType extends Types.SimpleVisitor<Choice<Unifier>, Unifier>
implements Unifiable<Type>, Inlineable<Type> {
@Override
@Nullable
public Choice<Unifier> visitType(Type t, @Nullable Unifier unifier) {
return Choice.none();
}
@Override
public final Choice<Unifier> unify(Type target, Unifier unifier) {
return (target != null) ? target.accept(this, unifier) : Choice.<Unifier>none();
}
}