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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.*;

/**
 * This DataEntrySource can read a given file or directory, recursively, passing its files as {@link
 * DataEntry} instances to {@link DataEntryReader} instances.
 *
 * @author Eric Lafortune
 */
public class DirectorySource implements DataEntrySource {
  private final File directory;

  /** Creates a new DirectorySource for the given directory. */
  public DirectorySource(File directory) {
    this.directory = directory;
  }

  // Implementations for DataEntrySource.

  @Override
  public void pumpDataEntries(DataEntryReader dataEntryReader) throws IOException {
    if (!directory.exists()) {
      throw new IOException("No such file or directory: " + directory);
    }

    readFiles(directory, dataEntryReader);
  }

  // Small utility methods.

  /**
   * Reads the given subdirectory recursively, applying the given DataEntryReader to all files that
   * are encountered.
   */
  private void readFiles(File file, DataEntryReader dataEntryReader) throws IOException {
    // Pass the file data entry to the reader.
    dataEntryReader.read(new FileDataEntry(directory, file));

    if (file.isDirectory()) {
      // Recurse into the subdirectory.
      File[] listedFiles = file.listFiles();

      for (int index = 0; index < listedFiles.length; index++) {
        File listedFile = listedFiles[index];
        try {
          readFiles(listedFile, dataEntryReader);
        } catch (IOException e) {
          throw new IOException(
              "Can't read [" + listedFile.getName() + "] (" + e.getMessage() + ")", e);
        }
      }
    }
  }
}