Package org.orekit.data

Class ClasspathCrawler

java.lang.Object
org.orekit.data.ClasspathCrawler
All Implemented Interfaces:
DataProvider
public class ClasspathCrawler extends Object implements DataProvider
Provider for data files stored as resources in the classpath.

This class handles a list of data files or zip/jar archives located in the classpath. Since the classpath is not a tree structure the list elements cannot be whole directories recursively browsed as in DirectoryCrawler, they must be data files or zip/jar archives.

A typical use case is to put all data files in a single zip or jar archive and to build an instance of this class with the single name of this zip/jar archive. Two different instances may be used one for user or project specific data and another one for system-wide or general data.

All registered filters are applied.

Zip archives entries are supported recursively.

This is a simple application of the visitor design pattern for list browsing.

Author:
Luc Maisonobe
See Also:

  • Constructor Details

    • ClasspathCrawler

      public ClasspathCrawler(String... list)
      Build a data classpath crawler.

      Calling this constructor has the same effect as calling ClasspathCrawler(ClassLoader, String...) with ClasspathCrawler.class.getClassLoader() as first argument.

      Parameters:
      list - list of data file names within the classpath

    • ClasspathCrawler

      public ClasspathCrawler(ClassLoader classLoader, String... list)
      Build a data classpath crawler.
      Parameters:
      classLoader - class loader to use to retrieve the resources
      list - list of data file names within the classpath

  • Method Details

    • feed

      public boolean feed(Pattern supported, DataLoader visitor, DataProvidersManager manager)
      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
      manager - with the filters to apply to the resources.
      Returns:
      true if some data has been loaded