/*
 * Copyright 2012-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.util;

import com.google.common.base.Preconditions;

import java.io.File;
import java.io.IOException;
import java.util.Enumeration;
import java.util.zip.ZipEntry;
import java.util.zip.ZipFile;

public abstract class ZipFileTraversal {
  private ZipFile zipFile;
  private final File file;

  public ZipFileTraversal(File file) {
    this.file = Preconditions.checkNotNull(file);
  }

  public abstract void visit(ZipFile zipFile, ZipEntry zipEntry) throws IOException;

  public final void traverse() throws IOException {
    zipFile = new ZipFile(file);
    Enumeration<? extends ZipEntry> entries = zipFile.entries();
    while (entries.hasMoreElements()) {
      ZipEntry entry = entries.nextElement();
      visit(zipFile, entry);
    }
  }
}