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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} delegates to a given {@link DataEntryReader}, each time stripping a
 * possible prefix from the read data entry name.
 *
 * @author Eric Lafortune
 */
public class PrefixStrippingDataEntryReader implements DataEntryReader {
  private final String prefix;
  private final DataEntryReader dataEntryReader;

  /** Creates a new PrefixStrippingDataEntryReader. */
  public PrefixStrippingDataEntryReader(String prefix, DataEntryReader dataEntryReader) {
    this.prefix = prefix;
    this.dataEntryReader = dataEntryReader;
  }

  // Implementation for DataEntryReader.

  @Override
  public void read(DataEntry dataEntry) throws IOException {
    // Strip the prefix if necessary.
    String name = dataEntry.getName();
    if (name.startsWith(prefix)) {
      dataEntry = new RenamedDataEntry(dataEntry, name.substring(prefix.length()));
    }

    // Read the data entry.
    dataEntryReader.read(dataEntry);
  }
}