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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} removes a given prefix from each transformed String, if present.
 *
 * @author Johan Leys
 */
public class PrefixRemovingStringFunction implements StringFunction {
  private final String prefix;
  private final StringFunction successStringFunction;
  private final StringFunction failStringFunction;

  /**
   * Creates a new PrefixRemovingStringFunction.
   *
   * @param prefix the prefix to remove from each string.
   */
  public PrefixRemovingStringFunction(String prefix) {
    this(prefix, StringFunction.IDENTITY_FUNCTION);
  }

  /**
   * Creates a new PrefixRemovingStringFunction.
   *
   * @param prefix the prefix to remove from each string.
   * @param stringFunction the function to subsequently apply to all strings.
   */
  public PrefixRemovingStringFunction(String prefix, StringFunction stringFunction) {
    this(prefix, stringFunction, stringFunction);
  }

  /**
   * Creates a new PrefixRemovingStringFunction.
   *
   * @param prefix the prefix to remove from each string.
   * @param successStringFunction the function to subsequently apply to prefixed strings.
   * @param failStringFunction the function to subsequently apply to other strings.
   */
  public PrefixRemovingStringFunction(
      String prefix, StringFunction successStringFunction, StringFunction failStringFunction) {
    this.prefix = prefix;
    this.successStringFunction = successStringFunction;
    this.failStringFunction = failStringFunction;
  }

  // Implementations for StringFunction.

  public String transform(String string) {
    return string.startsWith(prefix)
        ? successStringFunction.transform(string.substring(prefix.length()))
        : failStringFunction.transform(string);
  }
}