/*
    * SPDX-FileCopyrightText: Copyright (c) 2012-2025 Yegor Bugayenko
    * SPDX-License-Identifier: MIT
    */
   package com.jcabi.manifests;
   
   import java.io.File;
   import java.io.IOException;
   import java.io.InputStream;
  import java.util.ArrayList;
  import java.util.Collection;
  import java.util.Collections;
  
  /**
   * Manifests in files.
   *
   * Append attributes from {@code MANIFEST.MF} file:
   *
   * <pre> Manifests.append(new FilesMfs(new File("MANIFEST.MF")));</pre>
   *
   * <p>The class is immutable and thread-safe.
   *
   * @since 1.1
   */
  public final class FilesMfs implements Mfs {
  
      /**
       * Files.
       */
      private final transient Collection<File> files;
  
      /**
       * Ctor.
       * @param file File
       */
      public FilesMfs(final File file) {
          this(Collections.singleton(file));
      }
  
      /**
       * Ctor.
       * @param list Files
       */
      public FilesMfs(final Collection<File> list) {
          this.files = Collections.unmodifiableCollection(list);
      }
  
      @Override
      public Collection<InputStream> fetch() throws IOException {
          final Collection<InputStream> streams = new ArrayList<>(1);
          for (final File file : this.files) {
              streams.add(file.toURI().toURL().openStream());
          }
          return streams;
      }
  
  }