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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;

/**
 * This {@link DataEntryReader} reads data entries and requests their corresponding output streams
 * from a given {@link DataEntryWriter}, without actually using the output stream. This approach
 * correctly accounts for any filtering of the classes to output archives.
 *
 * @author Eric Lafortune
 */
public class IdleRewriter implements DataEntryReader {
  private final DataEntryWriter dataEntryWriter;

  public IdleRewriter(DataEntryWriter dataEntryWriter) {
    this.dataEntryWriter = dataEntryWriter;
  }

  // Implementations for DataEntryReader.

  @Override
  public void read(DataEntry dataEntry) throws IOException {
    // Get the output entry corresponding to this input entry, but don't
    // even try to close it.
    dataEntryWriter.createOutputStream(dataEntry);
  }
}