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www.hdfgroup.o rg The HDF Group ESIP Summer Meeting HDF-Java Overview Joel Plutchak The HDF Group 1 July 8 – 11, 2014
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www.hdfgroup.org
The HDF Group
1ESIP Summer Meeting
HDF-Java Overview
Joel PlutchakThe HDF Group
July 8 – 11, 2014
www.hdfgroup.orgESIP Summer Meeting 2July 8 – 11, 2014
Jan 1996Java 1.0
JHV & JHI1996
Fall 1997Java
Proposal
HDF5 Object LayerSpring 1999
Summer 2002
Common Object Model
EditingSpring 2003
Summer 2003
Abstract Interfaces & plug-in
framework
NPOESS: regions
references & bitfieldsSummer
2009
Summer 2013
CF Conven-
tions
An HDF-Java Timeline
www.hdfgroup.orgESIP Summer Meeting 3
HDF-Java Architecture
High-level architecture:• Java Application• Java Object Layer API• Format-specific / Java
Native Interface (JNI) implementations
• HDFView
July 8 – 11, 2014
www.hdfgroup.orgESIP Summer Meeting 4
HDFView
July 8 – 11, 2014
www.hdfgroup.orgESIP Summer Meeting 5
Current Status
Basic capabilities & limitationsHDFView:• Image & table views, editing, animation, some metadata convention support• Plug-in architecture for I/O and GUI (netCDF, FITS, HDF-EOS2/5)• Outdated graphical interface; scope creep
Java Object Layer:• Abstraction of HDF & generic dataset concepts• Data type mapping issues from HDF representation to Java• Memory model: monolithic
HDF4/HDF5 JNI Layer:• Most HDF functionality and data types supported• Some missing: e.g., variable length types, compound compound
July 8 – 11, 2014
http://www.hdfgroup.org/products/java/
www.hdfgroup.orgESIP Summer Meeting 6
Future Direction
July 8 – 11, 2014
?
Near-term work• Data types & functionality: fully realize in HDF Object and JNI
Layers • Decouple layers: easier packaging and distribution• Memory model: redesign to support large(r) datasets• Prepare to support new HDF5 features: HDF5 1.10
The Future
www.hdfgroup.orgESIP Summer Meeting 7
Questions?
Thank you!
July 8 – 11, 2014
This work was supported by subcontract 114820 under prime contract NNG10HP02C, funded by the National Aeronautics and Space Administration (NASA). Any opinions, findings, or conclusions expressed in this material are those of the author and do not necessarily reflect the views of NASA.
Joel [email protected]
www.hdfgroup.orgESIP Summer Meeting 8
Supplemental Slides
July 8 – 11, 2014
www.hdfgroup.orgESIP Summer Meeting 9
HDF-Java Object Classes
July 8 – 11, 2014
www.hdfgroup.orgESIP Summer Meeting
HDFView
July 8 – 11, 2014 10
www.hdfgroup.org
The HDF Group
11ESIP Summer Meeting
Earth Science GroupTed Habermann
Aleksandar JelenakH. Joe Lee
Joel PlutchakKent Yang
July 8 – 11, 2014
