src/com/facebook/buck/zip/CustomZipEntry.java

/*
 * Copyright 2013-present Facebook, Inc.
 *
 * 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 com.facebook.buck.zip;

import static java.util.zip.Deflater.BEST_COMPRESSION;
import static java.util.zip.Deflater.NO_COMPRESSION;

import com.google.common.base.Preconditions;

import java.util.zip.Deflater;
import java.util.zip.ZipEntry;

public class CustomZipEntry extends ZipEntry {

  private int compressionLevel = Deflater.DEFAULT_COMPRESSION;

  public CustomZipEntry(ZipEntry other) {
    super(other);
    setDefaultMethodIfMethodUnset();
  }

  public CustomZipEntry(String name) {
    super(name);
    setDefaultMethodIfMethodUnset();
  }

  private void setDefaultMethodIfMethodUnset() {
    if (getMethod() == -1) {
      setMethod(DEFLATED);
    }
  }

  public void setCompressionLevel(int compressionLevel) {
    Preconditions.checkArgument(
        compressionLevel >= NO_COMPRESSION && compressionLevel <= BEST_COMPRESSION);
    this.compressionLevel = compressionLevel;

    // We need to update the underlying method declared
    setMethod(compressionLevel == NO_COMPRESSION ? STORED : DEFLATED);

    // Reset the various fields that need to be updated.
    setCrc(0);
    setSize(0);
    setCompressedSize(0);
  }

  public int getCompressionLevel() {
    return compressionLevel;
  }
}