org.jclouds.blobstore.strategy.internal
Class MarkersGetDirectoryStrategy

java.lang.Object
  org.jclouds.blobstore.strategy.internal.MarkersGetDirectoryStrategy

All Implemented Interfaces:

GetDirectoryStrategy

@Singleton
public class MarkersGetDirectoryStrategy
extends Object
implements GetDirectoryStrategy

Key-value implementations of BlobStore, such as S3, do not have directories. In following the rackspace cloud files project, we use an empty object '#{dirpath}' with content type set to 'application/directory'.

To interoperate with other S3 tools, we accept the following ways to tell if the directory exists:

• an object named '#{dirpath}_$folder$' or '#{dirpath}/' denoting a directory marker
• an object with content type set to 'application/directory' denoting a directory marker
• if there exists any objects with the prefix "#{dirpath}/", then the directory is said to exist
• if both a file with the name of a directory and a marker for that directory exists, then the *file masks the directory*, and the directory is never returned.

Author:

Adrian Cole

See Also:

MarkerFileMkdirStrategy

Field Summary

protected ResourceMetadataToRelativePathResourceMetadata

resource2Directory

Constructor Summary

MarkersGetDirectoryStrategy(BlobStore connection, ResourceMetadataToRelativePathResourceMetadata resource2Directory)

Method Summary

StorageMetadata

execute(String containerName, String directory)

Methods inherited from class java.lang.Object

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

Field Detail

resource2Directory

protected final ResourceMetadataToRelativePathResourceMetadata resource2Directory

Constructor Detail

MarkersGetDirectoryStrategy

@Inject
public MarkersGetDirectoryStrategy(BlobStore connection,
                                          ResourceMetadataToRelativePathResourceMetadata resource2Directory)

Method Detail

execute

public StorageMetadata execute(String containerName,
                               String directory)

Specified by:

execute in interface GetDirectoryStrategy