DirectoryCrawler (ORbit Extrapolation KIT 9.3 API)

java.lang.Object
- org.orekit.data.DirectoryCrawler

All Implemented Interfaces:

DataProvider
```
public class DirectoryCrawler
extends Object
implements DataProvider
```
Provider for data files stored in a directories tree on filesystem.
This class handles data files recursively starting from a root directories tree. The organization of files in the directories is free. There may be sub-directories to any level. All sub-directories are browsed and all terminal files are checked for loading.

Gzip-compressed files are supported.

Zip archives entries are supported recursively.

This is a simple application of the visitor design pattern for directory hierarchy crawling.

Author:

Luc Maisonobe

See Also:

DataProvidersManager

Field Summary
- Fields inherited from interface org.orekit.data.DataProvider
  GZIP_FILE_PATTERN, ZIP_ARCHIVE_PATTERN

Constructor Summary

Constructors
Constructor Description

DirectoryCrawler(File root)
Build a data files crawler.

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`boolean`	`feed(Pattern supported, DataLoader visitor)`	Feed a data file loader by browsing the data collection.

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Constructor Detail
  - DirectoryCrawler
```
public DirectoryCrawler(File root)
```
    Build a data files crawler.
    
    Parameters:
    
    root - root of the directories tree (must be a directory)
- Method Detail
  - feed
```
public boolean feed(Pattern supported,
                    DataLoader visitor)
```
    Feed a data file loader by browsing the data collection.
    The method crawls all files referenced in the instance (for example all files in a directories tree) and for each file supported by the file loader it asks the file loader to load it.
    
    If the method completes without exception, then the data loader is considered to have been fed successfully and the top level data providers manager will return immediately without attempting to use the next configured providers.
    
    If the method completes abruptly with an exception, then the top level data providers manager will try to use the next configured providers, in case another one can feed the data loader.
    
    Specified by:
    
    feed in interface DataProvider
    
    Parameters:
    
    supported - pattern for file names supported by the visitor
    
    visitor - data file visitor to use
    
    Returns:
    
    true if some data has been loaded