com.liulishuo.filedownloader.services

Class DefaultIdGenerator

java.lang.Object

com.liulishuo.filedownloader.services.DefaultIdGenerator

All Implemented Interfaces:

FileDownloadHelper.IdGenerator

public class DefaultIdGenerator
extends Object
implements FileDownloadHelper.IdGenerator

The default id generator.

Constructor Summary

Constructors

Constructor and Description
DefaultIdGenerator()

Method Summary

Modifier and Type	Method and Description
int	generateId(String url, String path, boolean pathAsDirectory) Invoke this method when there is a new task from very beginning.
int	transOldId(int oldId, String url, String path, boolean pathAsDirectory) Invoke this method when the data is restoring from the database.

Methods inherited from class java.lang.Object

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

Constructor Detail

DefaultIdGenerator

public DefaultIdGenerator()

Method Detail

transOldId

public int transOldId(int oldId,
                      String url,
                      String path,
                      boolean pathAsDirectory)

Description copied from interface: FileDownloadHelper.IdGenerator

Invoke this method when the data is restoring from the database.

Specified by:

transOldId in interface FileDownloadHelper.IdGenerator

Parameters:

oldId - the old download id which is generated through the different.

url - the url path.

path - the download path.

pathAsDirectory - true: if the path is absolute directory to store the downloading file, and the filename will be found in contentDisposition from the response as default, if can't find contentDisposition,the filename will be generated by FileDownloadUtils.generateFileName(String) with url.

false: if the path = (absolute directory/filename)

Returns:

the new download id.

generateId

public int generateId(String url,
                      String path,
                      boolean pathAsDirectory)

Description copied from interface: FileDownloadHelper.IdGenerator

Invoke this method when there is a new task from very beginning.

Important Ting: this method would be used on the FileDownloadService and the upper-layer, so as default FileDownloadService is running on the `:filedownloader` process, and upper-layer is on the user process, in this case, if you want to cache something on this instance, it would be two different caches on two processes.

Tips: if you want the FileDownloadService runs on the upper-layer process too, just config process.non-separate=true on the filedownloader.properties, more detail please move to FileDownloadProperties

Specified by:

generateId in interface FileDownloadHelper.IdGenerator

Parameters:

url - the download url.

path - the download path.

pathAsDirectory - true: if the path is absolute directory to store the downloading file, and the filename will be found in contentDisposition from the response as default, if can't find contentDisposition,the filename will be generated by FileDownloadUtils.generateFileName(String) with url.

false: if the path = (absolute directory/filename)

Returns:

the download task identify.