java - Hadoop get relative path from absolute path and base path -

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i want relative path absolute path, given absolute base path. there hadoop java api this?

for example, if absolute hdfs path abs_path = hdfs://name-node/level1/level2/level3 , absolute base path abs_base_path = hdfs://name-node/level1, extract relative path abs_path, rel_path = level2/level3. familiar using path constructor combine 2 paths.

for example, if have rel_path , abs_base_path, can use 1 of overloaded constructors in path class http://hadoop.apache.org/docs/current/api/org/apache/hadoop/fs/path build abs_path cannot find api reverse.

this done in fileoutputcommitter's source code. relevant function is

   /**    * find final name of given output file, given job output directory    * , work directory.    * @param joboutputdir job's output directory    * @param taskoutput specific task output file    * @param taskoutputpath job's work directory    * @return final path specific output file    * @throws ioexception    */   private path getfinalpath(path joboutputdir, path taskoutput,                              path taskoutputpath) throws ioexception {     uri taskoutputuri = taskoutput.touri();     uri relativepath = taskoutputpath.touri().relativize(taskoutputuri);     if (taskoutputuri == relativepath) {       throw new ioexception("can not relative path: base = " +            taskoutputpath + " child = " + taskoutput);     }     if (relativepath.getpath().length() > 0) {       return new path(joboutputdir, relativepath.getpath());     } else {       return joboutputdir;     }   }

the idea create uri base directory , create new path new, relativized uri.

hope helps.


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