import org.apache.hadoop.hdfs.web.resources.HttpOpParam.Op; //导入依赖的package包/类
Param<?,?>[] getAuthParameters(final HttpOpParam.Op op) throws IOException {
  List<Param<?,?>> authParams = Lists.newArrayList();    
  // Skip adding delegation token for token operations because these
  // operations require authentication.
  Token<?> token = null;
  if (!op.getRequireAuth()) {
    token = getDelegationToken();
  }
  if (token != null) {
    authParams.add(new DelegationParam(token.encodeToUrlString()));
  } else {
    UserGroupInformation userUgi = ugi;
    UserGroupInformation realUgi = userUgi.getRealUser();
    if (realUgi != null) { // proxy user
      authParams.add(new DoAsParam(userUgi.getShortUserName()));
      userUgi = realUgi;
    }
    authParams.add(new UserParam(userUgi.getShortUserName()));
  }
  return authParams.toArray(new Param<?,?>[0]);
}
 

import org.apache.hadoop.hdfs.web.resources.HttpOpParam.Op; //导入依赖的package包/类
@Override
public Map<String, byte[]> getXAttrs(Path p, final List<String> names) 
    throws IOException {
  Preconditions.checkArgument(names != null && !names.isEmpty(), 
      "XAttr names cannot be null or empty.");
  Param<?,?>[] parameters = new Param<?,?>[names.size() + 1];
  for (int i = 0; i < parameters.length - 1; i++) {
    parameters[i] = new XAttrNameParam(names.get(i));
  }
  parameters[parameters.length - 1] = new XAttrEncodingParam(XAttrCodec.HEX);
  
  final HttpOpParam.Op op = GetOpParam.Op.GETXATTRS;
  return new FsPathResponseRunner<Map<String, byte[]>>(op, parameters, p) {
    @Override
    Map<String, byte[]> decodeResponse(Map<?, ?> json) throws IOException {
      return JsonUtil.toXAttrs(json);
    }
  }.run();
}
 

import org.apache.hadoop.hdfs.web.resources.HttpOpParam.Op; //导入依赖的package包/类
@Override
public FileStatus[] listStatus(final Path f) throws IOException {
  statistics.incrementReadOps(1);

  final HttpOpParam.Op op = GetOpParam.Op.LISTSTATUS;
  return new FsPathResponseRunner<FileStatus[]>(op, f) {
    @Override
    FileStatus[] decodeResponse(Map<?,?> json) {
      final Map<?, ?> rootmap = (Map<?, ?>)json.get(FileStatus.class.getSimpleName() + "es");
      final List<?> array = JsonUtil.getList(
          rootmap, FileStatus.class.getSimpleName());

      //convert FileStatus
      final FileStatus[] statuses = new FileStatus[array.size()];
      int i = 0;
      for (Object object : array) {
        final Map<?, ?> m = (Map<?, ?>) object;
        statuses[i++] = makeQualified(JsonUtil.toFileStatus(m, false), f);
      }
      return statuses;
    }
  }.run();
}
 

import org.apache.hadoop.hdfs.web.resources.HttpOpParam.Op; //导入依赖的package包/类
@Override
public Token<DelegationTokenIdentifier> getDelegationToken(
    final String renewer) throws IOException {
  final HttpOpParam.Op op = GetOpParam.Op.GETDELEGATIONTOKEN;
  Token<DelegationTokenIdentifier> token =
      new FsPathResponseRunner<Token<DelegationTokenIdentifier>>(
          op, null, new RenewerParam(renewer)) {
    @Override
    Token<DelegationTokenIdentifier> decodeResponse(Map<?,?> json)
        throws IOException {
      return JsonUtil.toDelegationToken(json);
    }
  }.run();
  if (token != null) {
    token.setService(tokenServiceName);
  } else {
    if (disallowFallbackToInsecureCluster) {
      throw new AccessControlException(CANT_FALLBACK_TO_INSECURE_MSG);
    }
  }
  return token;
}
 

import org.apache.hadoop.hdfs.web.resources.HttpOpParam.Op; //导入依赖的package包/类
@Override
public Path getHomeDirectory() {
  if (cachedHomeDirectory == null) {
    final HttpOpParam.Op op = GetOpParam.Op.GETHOMEDIRECTORY;
    try {
      String pathFromDelegatedFS = new FsPathResponseRunner<String>(op, null,
          new UserParam(ugi)) {
        @Override
        String decodeResponse(Map<?, ?> json) throws IOException {
          return JsonUtilClient.getPath(json);
        }
      }   .run();

      cachedHomeDirectory = new Path(pathFromDelegatedFS).makeQualified(
          this.getUri(), null);

    } catch (IOException e) {
      LOG.error("Unable to get HomeDirectory from original File System", e);
      cachedHomeDirectory = new Path("/user/" + ugi.getShortUserName())
          .makeQualified(this.getUri(), null);
    }
  }
  return cachedHomeDirectory;
}
 

import org.apache.hadoop.hdfs.web.resources.HttpOpParam.Op; //导入依赖的package包/类
Param<?,?>[] getAuthParameters(final HttpOpParam.Op op) throws IOException {
  List<Param<?,?>> authParams = Lists.newArrayList();
  // Skip adding delegation token for token operations because these
  // operations require authentication.
  Token<?> token = null;
  if (!op.getRequireAuth()) {
    token = getDelegationToken();
  }
  if (token != null) {
    authParams.add(new DelegationParam(token.encodeToUrlString()));
  } else {
    UserGroupInformation userUgi = ugi;
    UserGroupInformation realUgi = userUgi.getRealUser();
    if (realUgi != null) { // proxy user
      authParams.add(new DoAsParam(userUgi.getShortUserName()));
      userUgi = realUgi;
    }
    authParams.add(new UserParam(userUgi.getShortUserName()));
  }
  return authParams.toArray(new Param<?,?>[0]);
}
 

import org.apache.hadoop.hdfs.web.resources.HttpOpParam.Op; //导入依赖的package包/类
@Override
public Map<String, byte[]> getXAttrs(Path p, final List<String> names)
    throws IOException {
  Preconditions.checkArgument(names != null && !names.isEmpty(),
      "XAttr names cannot be null or empty.");
  Param<?,?>[] parameters = new Param<?,?>[names.size() + 1];
  for (int i = 0; i < parameters.length - 1; i++) {
    parameters[i] = new XAttrNameParam(names.get(i));
  }
  parameters[parameters.length - 1] = new XAttrEncodingParam(XAttrCodec.HEX);

  final HttpOpParam.Op op = GetOpParam.Op.GETXATTRS;
  return new FsPathResponseRunner<Map<String, byte[]>>(op, parameters, p) {
    @Override
    Map<String, byte[]> decodeResponse(Map<?, ?> json) throws IOException {
      return JsonUtilClient.toXAttrs(json);
    }
  }.run();
}
 

import org.apache.hadoop.hdfs.web.resources.HttpOpParam.Op; //导入依赖的package包/类
@Override
public FSDataOutputStream createNonRecursive(final Path f,
    final FsPermission permission, final EnumSet<CreateFlag> flag,
    final int bufferSize, final short replication, final long blockSize,
    final Progressable progress) throws IOException {
  statistics.incrementWriteOps(1);

  final HttpOpParam.Op op = PutOpParam.Op.CREATE;
  return new FsPathOutputStreamRunner(op, f, bufferSize,
      new PermissionParam(applyUMask(permission)),
      new CreateFlagParam(flag),
      new CreateParentParam(false),
      new BufferSizeParam(bufferSize),
      new ReplicationParam(replication),
      new BlockSizeParam(blockSize)
  ).run();
}
 

import org.apache.hadoop.hdfs.web.resources.HttpOpParam.Op; //导入依赖的package包/类
@Override
public Token<DelegationTokenIdentifier> getDelegationToken(
    final String renewer) throws IOException {
  final HttpOpParam.Op op = GetOpParam.Op.GETDELEGATIONTOKEN;
  Token<DelegationTokenIdentifier> token =
      new FsPathResponseRunner<Token<DelegationTokenIdentifier>>(
          op, null, new RenewerParam(renewer)) {
        @Override
        Token<DelegationTokenIdentifier> decodeResponse(Map<?,?> json)
            throws IOException {
          return JsonUtilClient.toDelegationToken(json);
        }
      }.run();
  if (token != null) {
    token.setService(tokenServiceName);
  } else {
    if (disallowFallbackToInsecureCluster) {
      throw new AccessControlException(CANT_FALLBACK_TO_INSECURE_MSG);
    }
  }
  return token;
}
 

import org.apache.hadoop.hdfs.web.resources.HttpOpParam.Op; //导入依赖的package包/类
URL toUrl(final HttpOpParam.Op op, final Path fspath,
    final Param<?,?>... parameters) throws IOException {
  //initialize URI path and query
  final String path = PATH_PREFIX
      + (fspath == null? "/": makeQualified(fspath).toUri().getRawPath());
  final String query = op.toQueryString()
      + Param.toSortedString("&", getAuthParameters(op))
      + Param.toSortedString("&", parameters);
  final URL url = getNamenodeURL(path, query);
  if (LOG.isTraceEnabled()) {
    LOG.trace("url=" + url);
  }
  return url;
}
 

import org.apache.hadoop.hdfs.web.resources.HttpOpParam.Op; //导入依赖的package包/类
private HttpURLConnection connect(final HttpOpParam.Op op, final URL url)
    throws IOException {
  final HttpURLConnection conn =
      (HttpURLConnection)connectionFactory.openConnection(url);
  final boolean doOutput = op.getDoOutput();
  conn.setRequestMethod(op.getType().toString());
  conn.setInstanceFollowRedirects(false);
  switch (op.getType()) {
    // if not sending a message body for a POST or PUT operation, need
    // to ensure the server/proxy knows this 
    case POST:
    case PUT: {
      conn.setDoOutput(true);
      if (!doOutput) {
        // explicitly setting content-length to 0 won't do spnego!!
        // opening and closing the stream will send "Content-Length: 0"
        conn.getOutputStream().close();
      } else {
        conn.setRequestProperty("Content-Type",
            MediaType.APPLICATION_OCTET_STREAM);
        conn.setChunkedStreamingMode(32 << 10); //32kB-chunk
      }
      break;
    }
    default: {
      conn.setDoOutput(doOutput);
      break;
    }
  }
  conn.connect();
  return conn;
}
 

import org.apache.hadoop.hdfs.web.resources.HttpOpParam.Op; //导入依赖的package包/类
private HdfsFileStatus getHdfsFileStatus(Path f) throws IOException {
  final HttpOpParam.Op op = GetOpParam.Op.GETFILESTATUS;
  HdfsFileStatus status = new FsPathResponseRunner<HdfsFileStatus>(op, f) {
    @Override
    HdfsFileStatus decodeResponse(Map<?,?> json) {
      return JsonUtil.toFileStatus(json, true);
    }
  }.run();
  if (status == null) {
    throw new FileNotFoundException("File does not exist: " + f);
  }
  return status;
}
 

import org.apache.hadoop.hdfs.web.resources.HttpOpParam.Op; //导入依赖的package包/类
@Override
public AclStatus getAclStatus(Path f) throws IOException {
  final HttpOpParam.Op op = GetOpParam.Op.GETACLSTATUS;
  AclStatus status = new FsPathResponseRunner<AclStatus>(op, f) {
    @Override
    AclStatus decodeResponse(Map<?,?> json) {
      return JsonUtil.toAclStatus(json);
    }
  }.run();
  if (status == null) {
    throw new FileNotFoundException("File does not exist: " + f);
  }
  return status;
}
 

import org.apache.hadoop.hdfs.web.resources.HttpOpParam.Op; //导入依赖的package包/类
@Override
public boolean mkdirs(Path f, FsPermission permission) throws IOException {
  statistics.incrementWriteOps(1);
  final HttpOpParam.Op op = PutOpParam.Op.MKDIRS;
  return new FsPathBooleanRunner(op, f,
      new PermissionParam(applyUMask(permission))
  ).run();
}
 

import org.apache.hadoop.hdfs.web.resources.HttpOpParam.Op; //导入依赖的package包/类
/**
 * Create a symlink pointing to the destination path.
 * @see org.apache.hadoop.fs.Hdfs#createSymlink(Path, Path, boolean) 
 */
public void createSymlink(Path destination, Path f, boolean createParent
    ) throws IOException {
  statistics.incrementWriteOps(1);
  final HttpOpParam.Op op = PutOpParam.Op.CREATESYMLINK;
  new FsPathRunner(op, f,
      new DestinationParam(makeQualified(destination).toUri().getPath()),
      new CreateParentParam(createParent)
  ).run();
}
 

import org.apache.hadoop.hdfs.web.resources.HttpOpParam.Op; //导入依赖的package包/类
@Override
public boolean rename(final Path src, final Path dst) throws IOException {
  statistics.incrementWriteOps(1);
  final HttpOpParam.Op op = PutOpParam.Op.RENAME;
  return new FsPathBooleanRunner(op, src,
      new DestinationParam(makeQualified(dst).toUri().getPath())
  ).run();
}
 

import org.apache.hadoop.hdfs.web.resources.HttpOpParam.Op; //导入依赖的package包/类
@Override
public void setXAttr(Path p, String name, byte[] value, 
    EnumSet<XAttrSetFlag> flag) throws IOException {
  statistics.incrementWriteOps(1);
  final HttpOpParam.Op op = PutOpParam.Op.SETXATTR;
  if (value != null) {
    new FsPathRunner(op, p, new XAttrNameParam(name), new XAttrValueParam(
        XAttrCodec.encodeValue(value, XAttrCodec.HEX)), 
        new XAttrSetFlagParam(flag)).run();
  } else {
    new FsPathRunner(op, p, new XAttrNameParam(name), 
        new XAttrSetFlagParam(flag)).run();
  }
}
 

import org.apache.hadoop.hdfs.web.resources.HttpOpParam.Op; //导入依赖的package包/类
@Override
public byte[] getXAttr(Path p, final String name) throws IOException {
  final HttpOpParam.Op op = GetOpParam.Op.GETXATTRS;
  return new FsPathResponseRunner<byte[]>(op, p, new XAttrNameParam(name), 
      new XAttrEncodingParam(XAttrCodec.HEX)) {
    @Override
    byte[] decodeResponse(Map<?, ?> json) throws IOException {
      return JsonUtil.getXAttr(json, name);
    }
  }.run();
}
 

import org.apache.hadoop.hdfs.web.resources.HttpOpParam.Op; //导入依赖的package包/类
@Override
public List<String> listXAttrs(Path p) throws IOException {
  final HttpOpParam.Op op = GetOpParam.Op.LISTXATTRS;
  return new FsPathResponseRunner<List<String>>(op, p) {
    @Override
    List<String> decodeResponse(Map<?, ?> json) throws IOException {
      return JsonUtil.toXAttrNames(json);
    }
  }.run();
}
 

import org.apache.hadoop.hdfs.web.resources.HttpOpParam.Op; //导入依赖的package包/类
@Override
public void setOwner(final Path p, final String owner, final String group
    ) throws IOException {
  if (owner == null && group == null) {
    throw new IOException("owner == null && group == null");
  }

  statistics.incrementWriteOps(1);
  final HttpOpParam.Op op = PutOpParam.Op.SETOWNER;
  new FsPathRunner(op, p,
      new OwnerParam(owner), new GroupParam(group)
  ).run();
}