StringLengthToEmpty.java

/*
 * Copyright 2016 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.
 */

import com.google.errorprone.refaster.annotation.AfterTemplate;
import com.google.errorprone.refaster.annotation.AlsoNegation;
import com.google.errorprone.refaster.annotation.BeforeTemplate;

/** Example template: Replaces calls of String.length() == 0 to String.isEmpty() */
public class StringLengthToEmpty {
  @BeforeTemplate
  boolean toUtf8Length(String string) {
    return string.length() == 0;
  }

  @AfterTemplate
  @AlsoNegation
  boolean optimizedMethod(String string) {
    return string.isEmpty();
  }
}