/*
* Copyright 2014 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.testdata.template;
import com.google.common.collect.ComparisonChain;
import com.google.errorprone.refaster.annotation.AfterTemplate;
import com.google.errorprone.refaster.annotation.BeforeTemplate;
import com.google.errorprone.refaster.annotation.Placeholder;
/**
* Example use of placeholder methods in a {@code ComparisonChain} refactoring.
*/
public abstract class ComparisonChainTemplate<A extends Comparable<A>, B extends Comparable<B>> {
@Placeholder(allowsIdentity = true) abstract <T> A propertyA(T t);
@Placeholder(allowsIdentity = true) abstract <T> B propertyB(T t);
@BeforeTemplate <T> int before(T left, T right) {
int cmp = propertyA(left).compareTo(propertyA(right));
if (cmp == 0) {
return propertyB(left).compareTo(propertyB(right));
} else {
return cmp;
}
}
@AfterTemplate <T> int after(T left, T right) {
return ComparisonChain.start()
.compare(propertyA(left), propertyA(right))
.compare(propertyB(left), propertyB(right))
.result();
}
}