Task #3365: create Java ObjectFormatInfo class to provide mime lookup - Infrastructure - DataONE Tasks

Task #3365

Story #3309: get() downloads have inconsistent mime types and filenames

create Java ObjectFormatInfo class to provide mime lookup

Added by Matthew Jones about 12 years ago. Updated about 10 years ago.

Status:

Closed

Priority:

High

Assignee:

Matthew Jones

Category:

d1_libclient_java

Target version:

CCI-2.0.0

Start date:

2012-10-25

Due date:

% Done:

100%

Milestone:

CCI-1.1

Product Version:

Story Points:

Sprint:

Description

We will use utility classes in libclient to provide a consistent lookup service to allow applications to find out the mime type and file extension for formatIDs. Create an ObjectFormatInfo class that provides:
* a static singleton that can be called from anywhere in an application
* function to find the mime type based on a formt identifier string
* function to find the mime type based on an ObjectFormat instance
* function to find the extension based on a formt identifier string
* function to find the extension based on an ObjectFormat instance
* a default set of mapping data that ships with libclient as a CSV file
* the ability for calling applications to set a property (D1Client.resourcesDir) that determines where this CSV data file will live on disk
* the ObjectFormatInfo class should be able to reload itself at runtime, re-reading the CSV file so applications can refresh mappings without a restart

History

#1 Updated by Matthew Jones about 12 years ago

Status changed from In Progress to Testing

Implemented the ObjectFormatInfo class and associated CSV file. Created JUnit test to run some simple sanity checks on operation. After testing and review, this task can be closed if no new issues are identified.

#2 Updated by Matthew Jones about 12 years ago

Usage of the class uses calls such as:

@
String mimetype = ObjectFormatInfo.instance().getMimeType("netCDF-3");
String extension = ObjectFormatInfo.instance().getExtension("netCDF-3");
@

#3 Updated by Ben Leinfelder about 12 years ago

Now using in Metacat trunk -- initial testing looks good.

#4 Updated by Ben Leinfelder about 12 years ago

Changes to local file were reflected in download.
Moving mapping file to new location and point configuration to that location worked, too.
I'm happy with this feature.