hadoop UnresolvedPathException 源码

  • 2022-10-20
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haddop UnresolvedPathException 代码


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 * 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
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package org.apache.hadoop.hdfs.protocol;

import org.apache.hadoop.classification.InterfaceAudience;
import org.apache.hadoop.classification.InterfaceStability;
import org.apache.hadoop.fs.UnresolvedLinkException;
import org.apache.hadoop.fs.Path;

 * Thrown when a symbolic link is encountered in a path.
public final class UnresolvedPathException extends UnresolvedLinkException {
  private static final long serialVersionUID = 1L;
  private String path;        // The path containing the link
  private String preceding;   // The path part preceding the link
  private String remainder;   // The path part following the link
  private String linkTarget;  // The link's target

   * Used by RemoteException to instantiate an UnresolvedPathException.
  public UnresolvedPathException(String msg) {

  public UnresolvedPathException(String path, String preceding,
      String remainder, String linkTarget) {
    this.path = path;
    this.preceding = preceding;
    this.remainder = remainder;
    this.linkTarget = linkTarget;

   * Return a path with the link resolved with the target.
  public Path getResolvedPath() {
    // If the path is absolute we cam throw out the preceding part and
    // just append the remainder to the target, otherwise append each
    // piece to resolve the link in path.
    boolean noRemainder = (remainder == null || "".equals(remainder));
    Path target = new Path(linkTarget);
    if (target.isUriPathAbsolute()) {
      return noRemainder ? target : new Path(target, remainder);
    } else {
      return noRemainder
        ? new Path(preceding, target)
        : new Path(new Path(preceding, linkTarget), remainder);

  public String getMessage() {
    String msg = super.getMessage();
    if (msg != null) {
      return msg;
    return getResolvedPath().toString();


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