Examples of org.apache.hadoop.fs.FileContext.listStatus()

org.apache.hadoop.fs.FileContext.listStatus()
List the statuses of the files/directories in the given path if the path is a directory. @param f is the path @return an iterator that traverses statuses of the files/directories in the given path @throws AccessControlException If access is denied @throws FileNotFoundException If f does not exist @throws UnsupportedFileSystemException If file system for f isnot supported @throws IOException If an I/O error occurredExceptions applicable to file systems accessed over RPC: @throws RpcClientException If an exception occurred in the RPC client @throws RpcServerException If an exception occurred in the RPC server @throws UnexpectedServerException If server implementation throws undeclared exception to RPC server

    String logicalHost = fs.getUri().getHost();
    Configuration haClientConf = fs.getConf();
    
    FileContext fc = FileContext.getFileContext(haClientConf);
    Path root = new Path("/");
    fc.listStatus(root);
    fc.listStatus(fc.makeQualified(root));
    fc.getDefaultFileSystem().getCanonicalServiceName();


    // Ensure that the logical hostname was never resolved.
    Mockito.verify(spyNS, Mockito.never()).lookupAllHostAddr(Mockito.eq(logicalHost));

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    Configuration haClientConf = fs.getConf();
    
    FileContext fc = FileContext.getFileContext(haClientConf);
    Path root = new Path("/");
    fc.listStatus(root);
    fc.listStatus(fc.makeQualified(root));
    fc.getDefaultFileSystem().getCanonicalServiceName();


    // Ensure that the logical hostname was never resolved.
    Mockito.verify(spyNS, Mockito.never()).lookupAllHostAddr(Mockito.eq(logicalHost));
  }

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      assertTrue(status.getLen() == fileSize);
      assertEquals(file1.makeQualified(fs.getUri(), 
          fs.getWorkingDirectory()).toString(), 
          status.getPath().toString());
      
      Iterator<FileStatus> itor = fc.listStatus(file1);
      status = itor.next();
      assertEquals(stats[0], status);
      assertTrue(file1 + " should be a file", 
          status.isDirectory() == false);

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      } catch (FileNotFoundException fe) {
        assertTrue(fe.getMessage().equals("File " + dir + " does not exist."));
      }
      
      try {
        itor = fc.listStatus(dir);
        fail("listStatus of non-existent path should fail");
      } catch (FileNotFoundException fe) {
        assertTrue(fe.getMessage().equals("File " + dir + " does not exist."));
      }
      try {

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      assertEquals(dir + " should be zero size ",
          0, fs.getContentSummary(dir).getLength());
      assertEquals(dir + " should be zero size using hftp",
          0, hftpfs.getContentSummary(dir).getLength());
      
      itor = fc.listStatus(dir);
      assertFalse(dir + " should be empty", itor.hasNext());


      // create another file that is smaller than a block.
      //
      Path file2 = new Path(dir, "filestatus2.dat");

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      stats = fs.listStatus(dir);
      assertEquals(dir + " should have two entries", 2, stats.length);
      assertEquals(file2.toString(), stats[0].getPath().toString());
      assertEquals(file3.toString(), stats[1].getPath().toString());


      itor = fc.listStatus(dir);
      assertEquals(file2.toString(), itor.next().getPath().toString());
      assertEquals(file3.toString(), itor.next().getPath().toString());
      assertFalse(itor.hasNext());


      // test iterative listing

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      assertEquals(dir + " should have three entries", 3, stats.length);
      assertEquals(dir3.toString(), stats[0].getPath().toString());
      assertEquals(file2.toString(), stats[1].getPath().toString());
      assertEquals(file3.toString(), stats[2].getPath().toString());


      itor = fc.listStatus(dir);
      assertEquals(dir3.toString(), itor.next().getPath().toString());
      assertEquals(file2.toString(), itor.next().getPath().toString());
      assertEquals(file3.toString(), itor.next().getPath().toString());
      assertFalse(itor.hasNext());

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      assertEquals(dir4.toString(), stats[1].getPath().toString());
      assertEquals(dir5.toString(), stats[2].getPath().toString());
      assertEquals(file2.toString(), stats[3].getPath().toString());
      assertEquals(file3.toString(), stats[4].getPath().toString());
      
      itor = fc.listStatus(dir);
      assertEquals(dir3.toString(), itor.next().getPath().toString());
      assertEquals(dir4.toString(), itor.next().getPath().toString());
      assertEquals(dir5.toString(), itor.next().getPath().toString());
      assertEquals(file2.toString(), itor.next().getPath().toString());
      assertEquals(file3.toString(), itor.next().getPath().toString());

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    String logicalHost = fs.getUri().getHost();
    Configuration haClientConf = fs.getConf();
    
    FileContext fc = FileContext.getFileContext(haClientConf);
    Path root = new Path("/");
    fc.listStatus(root);
    fc.listStatus(fc.makeQualified(root));
    fc.getDefaultFileSystem().getCanonicalServiceName();


    // Ensure that the logical hostname was never resolved.
    Mockito.verify(spyNS, Mockito.never()).lookupAllHostAddr(Mockito.eq(logicalHost));

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    Configuration haClientConf = fs.getConf();
    
    FileContext fc = FileContext.getFileContext(haClientConf);
    Path root = new Path("/");
    fc.listStatus(root);
    fc.listStatus(fc.makeQualified(root));
    fc.getDefaultFileSystem().getCanonicalServiceName();


    // Ensure that the logical hostname was never resolved.
    Mockito.verify(spyNS, Mockito.never()).lookupAllHostAddr(Mockito.eq(logicalHost));
  }

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