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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.io;

import java.io.IOException;
import proguard.classfile.*;
import proguard.util.StringFunction;

/**
 * This {@link DataEntryReader} delegates to another {@link DataEntryReader}, renaming the data
 * entries based on the given string function. Entries whose name are transformed to null or an
 * empty string are passed to an optional alternative {@link DataEntryReader}.
 *
 * @author Eric Lafortune
 */
public class RenamedDataEntryReader implements DataEntryReader {
  private final StringFunction nameFunction;
  private final DataEntryReader dataEntryReader;
  private final DataEntryReader missingDataEntryReader;

  /**
   * Creates a new RenamedDataEntryReader.
   *
   * @param nameFunction the function from old names to new names.
   * @param dataEntryReader the DataEntryReader to which renamed data entries will be passed.
   */
  public RenamedDataEntryReader(StringFunction nameFunction, DataEntryReader dataEntryReader) {
    this(nameFunction, dataEntryReader, null);
  }

  /**
   * Creates a new RenamedDataEntryReader.
   *
   * @param nameFunction the function from old names to new names.
   * @param dataEntryReader the DataEntryReader to which renamed data entries will be passed.
   * @param missingDataEntryReader the optional DataEntryReader to which data entries that can't be
   *     renamed will be passed.
   */
  public RenamedDataEntryReader(
      StringFunction nameFunction,
      DataEntryReader dataEntryReader,
      DataEntryReader missingDataEntryReader) {
    this.nameFunction = nameFunction;
    this.dataEntryReader = dataEntryReader;
    this.missingDataEntryReader = missingDataEntryReader;
  }

  // Implementations for DataEntryReader.

  @Override
  public void read(DataEntry dataEntry) throws IOException {
    String name = dataEntry.getName();

    // Add a directory separator if necessary.
    if (dataEntry.isDirectory() && name.length() > 0) {
      name += TypeConstants.PACKAGE_SEPARATOR;
    }

    String newName = nameFunction.transform(name);
    if (newName != null && newName.length() > 0) {
      // Remove the directory separator if necessary.
      if (dataEntry.isDirectory()) {
        newName = newName.substring(0, newName.length() - 1);
      }

      dataEntryReader.read(new RenamedDataEntry(dataEntry, newName));
    } else if (missingDataEntryReader != null) {
      missingDataEntryReader.read(dataEntry);
    }
  }
}