/*
* 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.source.tree.Tree;
import com.sun.source.util.SimpleTreeVisitor;
import com.sun.tools.javac.tree.JCTree;
import javax.annotation.Nullable;
/**
* A serializable representation of a template syntax tree which can be unified with a target AST
* and inlined based on a set of substitutions.
*
* @param <T> The type this tree inlines to.
* @author Louis Wasserman (lowasser@google.com)
*/
public abstract class UTree<T extends JCTree> extends SimpleTreeVisitor<Choice<Unifier>, Unifier>
implements Unifiable<Tree>, Inlineable<T>, Tree {
@Override
public Choice<Unifier> unify(@Nullable Tree target, Unifier unifier) {
return (target != null) ? target.accept(this, unifier) : Choice.<Unifier>none();
}
@Override
protected Choice<Unifier> defaultAction(Tree node, Unifier unifier) {
return Choice.none();
}
}