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ProGuardCORE is a free library to read, analyze, modify, and write Java class files.

There is a newer version: 9.1.6

/*
 * ProGuardCORE -- library to process Java bytecode.
 *
 * Copyright (c) 2002-2020 Guardsquare NV
 *
 * 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 proguard.util;

/**
 * This {@link StringFunction} returns the original string if the given {@link StringFunction}
 * returns null, or null otherwise.
 *
 * @author Eric Lafortune
 */
public class NotStringFunction implements StringFunction {
  private final StringFunction stringFunction;

  /** Creates a new NotStringFunction with the two given string functions. */
  public NotStringFunction(StringFunction stringFunction) {
    this.stringFunction = stringFunction;
  }

  // Implementations for StringFunction.

  @Override
  public String transform(String string) {
    return stringFunction.transform(string) == null ? string : null;
  }
}