/*
* 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.Ordering;
import com.google.errorprone.refaster.annotation.AfterTemplate;
import com.google.errorprone.refaster.annotation.BeforeTemplate;
import com.google.errorprone.refaster.annotation.Placeholder;
/**
* Example template calling {@code return} on a placeholder invocation.
*
* @author lowasser@google.com (Louis Wasserman)
*/
public abstract class ReturnPlaceholderTemplate<T> {
// This particular example is inspired by a much more practically useful example with Java 8...
@Placeholder
abstract int firstCompare(T left, T right);
@Placeholder
abstract int secondCompare(T left, T right);
@BeforeTemplate
Ordering<T> combined() {
return new Ordering<T>() {
@Override
public int compare(T left, T right) {
int cmp = firstCompare(left, right);
if (cmp != 0) {
return cmp;
}
return secondCompare(left, right);
}
};
}
@AfterTemplate
Ordering<T> split() {
return new Ordering<T>() {
@Override
public int compare(T left, T right) {
/*
* firstCompare was used as a one-line expression in @BeforeTemplate, but will be a return
* placeholder here
*/
return firstCompare(left, right);
}
}.compound(new Ordering<T>() {
@Override
public int compare(T left, T right) {
return secondCompare(left, right);
}
});
}
}