FileDownloadCacheWrapper

public class FileDownloadCacheWrapper
extends Object implements IFileDownloader

java.lang.Object
↳	com.android.tradefed.build.FileDownloadCacheWrapper

A wrapper class that provides FileDownloadCache facilities while implementing the IFileDownloader interface.

Useful for cases where you want to abstract the use of the cache from callers.

Summary

Public constructors
`FileDownloadCacheWrapper(File cacheDir, IFileDownloader delegateDownloader)`

Public methods
`void`	`downloadFile(String remotePath, File destFile)` Alternate form of `downloadFile(String)`, that allows caller to specify the destination file the remote contents should be placed in.
`File`	`downloadFile(String remoteFilePath)` Downloads a remote file to a temporary file on local disk.
`boolean`	`isFresh(File localFile, String remoteFilePath)` Check local file's freshness.

Public constructors

FileDownloadCacheWrapper

public FileDownloadCacheWrapper (File cacheDir, 
                IFileDownloader delegateDownloader)

Parameters
`cacheDir`	`File`
`delegateDownloader`	`IFileDownloader`

Public methods

downloadFile

public void downloadFile (String remotePath, 
                File destFile)

Alternate form of downloadFile(String), that allows caller to specify the destination file the remote contents should be placed in.

Parameters
`remotePath`	`String`: the remote path to the file to download, relative to an implementation-specific root.
`destFile`	`File`: the file to place the downloaded contents into. Should not exist.

Throws
`BuildRetrievalError`

downloadFile

public File downloadFile (String remoteFilePath)

Downloads a remote file to a temporary file on local disk.

Parameters
`remoteFilePath`	`String`: the remote path to the file to download, relative to a implementation specific root.

Returns
`File`	the temporary local downloaded `ERROR(/File)`.

Throws
`BuildRetrievalError`

isFresh

public boolean isFresh (File localFile, 
                String remoteFilePath)

Check local file's freshness. If local file is the same as remote file, then it's fresh. If not, local file is stale. This is mainly used for cache. The default implementation will always return true, so if the file is immutable it will never need to check freshness.

Parameters
`localFile`	`File`: local file.
`remoteFilePath`	`String`: remote file path.

Returns
`boolean`	True if local file is fresh, otherwise false.

Throws
`BuildRetrievalError`