content: /*
   * Licensed to the Apache Software Foundation (ASF) under one
   * or more contributor license agreements.  See the NOTICE file
   * distributed with this work for additional information
   * regarding copyright ownership.  The ASF licenses this file
   * to you 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 org.apache.beam.sdk.io;
  
  import static java.nio.channels.Channels.newInputStream;
  import static org.junit.Assert.assertArrayEquals;
  import static org.junit.Assert.assertEquals;
  
  import java.io.IOException;
  import java.io.InputStream;
  import java.nio.channels.ReadableByteChannel;
  import org.apache.beam.sdk.io.fs.ResolveOptions;
  import org.apache.beam.sdk.options.PipelineOptionsFactory;
  import org.junit.Test;
  import org.junit.runner.RunWith;
  import org.junit.runners.JUnit4;
  
  @RunWith(JUnit4.class)
  public class ClassLoaderFileSystemTest {
  
    private static final String SOME_CLASS =
        "classpath://org/apache/beam/sdk/io/ClassLoaderFileSystem.class";
  
    @Test
    public void testOpen() throws IOException {
      ClassLoaderFileSystem filesystem = new ClassLoaderFileSystem();
      ReadableByteChannel channel = filesystem.open(filesystem.matchNewResource(SOME_CLASS, false));
      checkIsClass(channel);
    }
  
    @Test
    public void testRegistrar() throws IOException {
      ReadableByteChannel channel = FileSystems.open(FileSystems.matchNewResource(SOME_CLASS, false));
      checkIsClass(channel);
    }
  
    @Test
    public void testResolve() throws IOException {
      ClassLoaderFileSystem filesystem = new ClassLoaderFileSystem();
      ClassLoaderFileSystem.ClassLoaderResourceId original =
          filesystem.matchNewResource(SOME_CLASS, false);
      ClassLoaderFileSystem.ClassLoaderResourceId parent = original.getCurrentDirectory();
      ClassLoaderFileSystem.ClassLoaderResourceId grandparent = parent.getCurrentDirectory();
      assertEquals("classpath://org/apache/beam/sdk", grandparent.getFilename());
      ClassLoaderFileSystem.ClassLoaderResourceId resource =
          grandparent
              .resolve("io", ResolveOptions.StandardResolveOptions.RESOLVE_DIRECTORY)
              .resolve(
                  "ClassLoaderFileSystem.class", ResolveOptions.StandardResolveOptions.RESOLVE_FILE);
      ReadableByteChannel channel = filesystem.open(resource);
      checkIsClass(channel);
    }
  
    public void checkIsClass(ReadableByteChannel channel) throws IOException {
      FileSystems.setDefaultPipelineOptions(PipelineOptionsFactory.create());
      InputStream inputStream = newInputStream(channel);
      byte[] magic = new byte[4];
      inputStream.read(magic);
      assertArrayEquals(magic, new byte[] {(byte) 0xCA, (byte) 0xFE, (byte) 0xBA, (byte) 0xBE});
    }
  }
  