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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 {@link DataEntryWriter} delegates to a given {@link DataEntryWriter}, each time adding a
 * prefix of the written data entry name.
 *
 * @author Eric Lafortune
 */
public class PrefixAddingDataEntryWriter implements DataEntryWriter {
  private final String prefix;
  private final DataEntryWriter dataEntryWriter;

  /** Creates a new PrefixAddingDataEntryWriter. */
  public PrefixAddingDataEntryWriter(String prefix, DataEntryWriter dataEntryWriter) {
    this.prefix = prefix;
    this.dataEntryWriter = dataEntryWriter;
  }

  // Implementations for DataEntryWriter.

  @Override
  public boolean createDirectory(DataEntry dataEntry) throws IOException {
    return dataEntryWriter.createDirectory(renamedDataEntry(dataEntry));
  }

  @Override
  public boolean sameOutputStream(DataEntry dataEntry1, DataEntry dataEntry2) throws IOException {
    return dataEntryWriter.sameOutputStream(
        renamedDataEntry(dataEntry1), renamedDataEntry(dataEntry2));
  }

  @Override
  public OutputStream createOutputStream(DataEntry dataEntry) throws IOException {
    return dataEntryWriter.createOutputStream(renamedDataEntry(dataEntry));
  }

  @Override
  public void close() throws IOException {
    dataEntryWriter.close();
  }

  @Override
  public void println(PrintWriter pw, String prefix) {
    pw.println(prefix + "PrefixAddingDataEntryWriter (prefix = " + prefix + ")");
    dataEntryWriter.println(pw, prefix + "  ");
  }

  // Small utility methods.

  /** Adds the prefix to the given data entry name. */
  private DataEntry renamedDataEntry(DataEntry dataEntry) {
    return new RenamedDataEntry(dataEntry, prefix + dataEntry.getName());
  }
}