org.apache.commons.configuration2.io

Class FileSystemLocationStrategy

java.lang.Object

org.apache.commons.configuration2.io.FileSystemLocationStrategy

All Implemented Interfaces:

FileLocationStrategy

public class FileSystemLocationStrategy
extends Object
implements FileLocationStrategy

A specialized implementation of FileLocationStrategy which uses the passed in FileSystem to locate a file.

This strategy implementation ignores the URL of the passed in FileLocator and operates on its base path and file name. These properties are passed to the locateFromURL() method of FileSystem. So the burden of resolving the file is delegated to the FileSystem.

Since:

2.0

Constructor Summary

Constructors

Constructor and Description
FileSystemLocationStrategy()

Method Summary

Modifier and Type	Method and Description
URL	locate(FileSystem fileSystem, FileLocator locator) Tries to locate the specified file.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

FileSystemLocationStrategy

public FileSystemLocationStrategy()

Method Detail

locate

public URL locate(FileSystem fileSystem,
                  FileLocator locator)

Tries to locate the specified file. The method also expects the FileSystem to be used. Note that the FileLocator object may also contain a FileSystem, but this is optional. The passed in FileSystem should be used, and callers must not pass a null reference for this argument. A concrete implementation has to evaluate the properties stored in the FileLocator object and try to match them to an existing file. If this can be done, a corresponding URL is returned. Otherwise, result is null. Implementations should not throw an exception (unless parameters are null) as there might be alternative strategies which can find the file in question. This implementation delegates to the FileSystem.

Specified by:

locate in interface FileLocationStrategy

Parameters:

fileSystem - the FileSystem to be used for this operation

locator - the object describing the file to be located

Returns:

a URL pointing to the referenced file if location was successful; null if the file could not be resolved