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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.*;
import proguard.classfile.TypeConstants;

/**
 * This {@link DataEntry} represents a file.
 *
 * @author Eric Lafortune
 */
public class FileDataEntry implements DataEntry {
  private final File directory;
  private final File file;
  private InputStream inputStream;

  /**
   * Creates a new FileDataEntry.
   *
   * @param file the the absolute or relative location of the file.
   */
  public FileDataEntry(File file) {
    this(null, file);
  }

  /**
   * Creates a new FileDataEntry.
   *
   * @param directory the base directory for the file.
   * @param file the the absolute or relative location of the file.
   */
  public FileDataEntry(File directory, File file) {
    this.directory = directory;
    this.file = file;
  }

  /** Returns the complete file, including its directory. */
  public File getFile() {
    return directory == null || file.equals(directory)
        ? file
        : new File(directory, getRelativeFilePath());
  }

  // Implementations for DataEntry.

  @Override
  public String getName() {
    // Chop the directory name from the file name and get the right separators.
    return directory == null || file.equals(directory) ? file.getName() : getRelativeFilePath();
  }

  /**
   * Returns the file path of this data entry, relative to the base directory. If the file equals
   * the base directory, an empty string is returned.
   */
  private String getRelativeFilePath() {
    return directory == null || file.equals(directory)
        ? ""
        : file.getPath()
            .substring(directory.getPath().length() + File.separator.length())
            .replace(File.separatorChar, TypeConstants.PACKAGE_SEPARATOR);
  }

  @Override
  public String getOriginalName() {
    return getName();
  }

  @Override
  public long getSize() {
    return file.length();
  }

  @Override
  public boolean isDirectory() {
    return file.isDirectory();
  }

  @Override
  public InputStream getInputStream() throws IOException {
    if (inputStream == null) {
      inputStream = new BufferedInputStream(new FileInputStream(file));
    }

    return inputStream;
  }

  @Override
  public void closeInputStream() throws IOException {
    inputStream.close();
    inputStream = null;
  }

  @Override
  public DataEntry getParent() {
    return null;
  }

  // Implementations for Object.

  @Override
  public String toString() {
    return getName();
  }
}