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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 static proguard.classfile.ClassConstants.CLASS_FILE_EXTENSION;
import static proguard.classfile.util.ClassUtil.internalClassName;

import java.io.*;

/**
 * {@link DataEntry} implementation which loads an input stream from the classpath of the running
 * VM.
 *
 * @author Johan Leys
 */
public class ClassPathDataEntry implements DataEntry {
  private final String name;

  private InputStream inputStream;

  /**
   * Creas an new ClassPathDataEntry for the given class.
   *
   * @param clazz the class for which to create a data entry.
   */
  public ClassPathDataEntry(Class clazz) {
    this(internalClassName(clazz.getName()) + CLASS_FILE_EXTENSION);
  }

  /**
   * Creates a new ClassPathDataEntry for the entry with the given name.
   *
   * @param name the name of the class for which to create a data entry.
   */
  public ClassPathDataEntry(String name) {
    this.name = name;
  }

  // Implementations for DataEntry.

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

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

  @Override
  public long getSize() {
    return -1;
  }

  @Override
  public boolean isDirectory() {
    return false;
  }

  @Override
  public InputStream getInputStream() throws IOException {
    if (inputStream == null) {
      inputStream = getClass().getClassLoader().getResourceAsStream(name);
    }
    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();
  }
}