How to write java code that runs in J2SE and Java CDC Personal Profile. From the gvSIG Mobile developers

1. gvSIG Mobile
How to code for desktop and mobile GIS/SDI
Miguel Montesinos Javier Carrasco
Project Manager Project Development Chief
gvSIG technical committee gvSIG technical committee
gvSIG management committee gvSIG developer
WEDNESDAY 1 OCT FOSS4G 2008 – Cape Town, South Africa 1

2. Agenda
●
Introduction
● New features in gvSIG Mobile
●
Mobile Devices
●
Java versions
●
J2SE-J2ME Compatibility Tips
●
Take packages from J2SE VMs
●
Use the compatible alternative
● MVC Splitting and dependency injection
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3. Introduction
Introduction. Prodevelop
● Spanish company, Valencia
●
15 years of GIS experience
●
More than 50 people
● Member of gvSIG dev. team
● High focus on FOSS4G
www.prodevelop.es
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4. Introduction
Introduction. gvSIG context
● Full-fledged GIS desktop with:
●
Vector/Raster support.
● SDI client (WMS, WMC, WFS, WCS, CSW, ...)
●
Analysis (Sextante project)
●
Edition, projections, adv.symbology, ...
● Going on:
● 3D
●
Network Analysis
●
Raster & remote sensing
● Adv. Analysis
●
4D, Sensor
●
European Union funds until 2013
● Available in 10+ languages
● Around 1.500 users subscribed to lists
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5. Introduction
Introduction. gvSIG @ FOSS4G2008
● PAL. A Cartographic Labeling Library
●
Olivier Ertz, Maxence Laurent, Daniel Rappo, Abson Sae-
Tang, Eric Taillard. Room 2.6a. TUESDAY 30 SEPT
●
●
Multipurpose metadata management in gvSIG
●
Laura Díaz. Room 2.6a (297). TUESDAY 30 SEPT
●
●
Improving open source GIS-SDI integration: the web service
publishing extension for gvSIG
●
Salvador Bayarri. Room 2.4b (120) THURSDAY 10:30
●
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6. Introduction
Introduction. gvSIG @ FOSS4G2008
●
●
gvSIG Status Report. Towards an open organization
●
Miguel Montesinos. Room 1.6 (260) THURSDAY 10:30
●
●
A free graphical modeling tool for geospatial analysis
● Victor Olaya. Room 1.6 (260) THURSDAY 10:30
●
●
Introduction to gvSIG/SEXTANTE as desktop GIS with
advanced spatial analysis and SDI publishing tools
●
Victor Olaya, Salvador Bayarri, Jose Vicente Higon, Laura Diaz
●
Workshop CODE: WS-F-8. FRIDAY 13:30
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7. Introduction. gvSIG Mobile
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8. Introduction
Introduction. gvSIG Mobile
●
gvSIG for mobile devices
●
Developed by:
●
Prodevelop
●
Robotics Institute @ Univ. of Valencia
● IVER
● New version in october
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9. New Features
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10. EDITING
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11. edition screenshots
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12. CUSTOM FORMS
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13. custom forms screenshots
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14. New Features
●
Edition
● Custom Forms
●
GML
●
KML
●
GPX
●
phoneME Advanced integration
● Easier installation
● Bugfixes
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15. Mobile Devices
Laptop
PDA
Phone
Smartphone
UMPC
Mini Laptop
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16. Mobile Devices
Portable PCs Mobile Phones
● Desktop OS ●
Propietary OS
●
Powerful processors ●
Slow processors
●
More than 512 RAM ● Very small memory
●
J2SE ● J2ME CLDC
●
Capable of running ●
Small non.touch screens
gvSIG desktop ●
Too limited for a
complete GIS
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17. Mobile Devices
PDAs and Smartphones
●
Cheap devices (200€+)
●
Touchscreens (240x360 or more)
●
J2ME CDC PP (Subset of J2SE)
● ARM 400MHz+ processors
●
64-128MB RAM
●
GPRS/UMTS internet
● Camera
● GPS
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18. Java Versions
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19. Java Versions
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20. Mobile Devices – Java Versions
●
Mobile Phones:
●
CLDC MIDP limited but connected map viewers
●
● Portable PCs:
●
Existing J2SE applications with customized GUIs
●
●
Smartphones and PDAs:
●
J2SE VMs for PDA runned too slow
●
J2ME CDC PP
● New applications
●
Share libraries with desktop applications
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21. Java Versions – CDC PP
Packages in both J2SE and in J2ME CDC PP
java.util java.io
java.applet java.awt java.lang
java.net java.rmi java.math
java.security java.beans java.text
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22. Java Versions – CDC PP
Packages in J2SE and NOT in J2ME CDC PP
java.sql
java.awt.geom javax.imageio javax.security
javax.sql
java.awt.dnd java.util.logging javax.sound javax.naming
java.awt.print
java.util.prefs javax.swing javax.net
javax.print
org.w3c.dom
java.nio java.util.regex org.xml javax.rmi
javax.xml
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23. Java Versions – CDC PP
Packages in J2ME CDC PP and NOT in J2SE
javax.microedition.io
javax.microedition.pki
javax.microedition.xlet
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24. Java Versions – CDC PP
Other differences with J2SE
● Classes non existent in shared packages
● For example the package java.io lacks
●
LineNumberInputStream
● StringBufferInputStream
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25. Java Versions – CDC PP
Other differences with J2SE
● Methods non existent in shared classes
●
For example String class lack the methods:
●
getBytes(int srcBegin, int srcEnd, byte[] dst, int dstBegin)
●
matches(String regex)
●
replaceAll(String regex, String replacement)
● replaceFirst(String regex, String replacement)
●
split(String regex)
●
split(String regex, int limit)
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26. How to code for J2SE and CDC PP
TIPS for compatibility
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27. J2SE – CDC PP Compatibility Tips
Tip 1
If you need a package just take it
Most VMs allow you to add protected packages
java -Xbootclasspath:myawtgeom.jar ...
There are free implementations of J2SE we can use
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28. J2SE – CDC PP Compatibility Tips
Tip 1
If you need a package just take it
●
Worked very well to add
●
java.awt.geom
● java.util.regex
We can use only pure java 1.4 code
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29. J2SE – CDC PP Compatibility Tips
Tip 2
Use the compatible alternative
● Use when possible packages and classes that
exist in both configurations
●
Instead of using SAX or DOM XML parsers use
lightweight pull parsers (ie KXML)
●
Use 3rd party libraries that only depends on packages
existing in both configurations
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30. J2SE – CDC PP Compatibility Tips
Tip 3
MVC Separation and Dependency Injection
● Controller can to be shared
●
Some Model libraries are compatible and some
others not
●
View never is compatible
●
Dependency Injection allows you to keep some
libraries common and others different
WEDNESDAY 1 OCT FOSS4G 2008 – Cape Town, South Africa 30

31. J2SE – CDC PP Compatibility Tips
Tip 3
MVC Separation and Dependency Injection
Model Controller View
Desktop
Desktop
Application optimized Swing
Libraries DI
DI MDI GUI
Common Common
Libraries Controller
Mobile
Application DI
PDA DI AWT
optimized Simple GUI
Libraries
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32. J2SE – CDC PP Compatibility Tips
Tip 4
Libraries of frequently used incompatible code
● Libraries with utilities not existing in CDC PP to
be used both in desktop and in mobile
●
Examples:
StringUtils NetworkUtils FileUtils
splitString() getNetFile() getImage()
replaceAll() sendEmail() fileToString()
WEDNESDAY 1 OCT FOSS4G 2008 – Cape Town, South Africa 32

33. Conclussions
●
It's doable to develop GIS with Java for PDAS
●
Ultramobile PCs and Low-Cost Laptops will need new
interfaces for existing desktop GIS applications
●
Java allows real portability of code
●
gvSIG now fits in our pockets
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34. VIDEOS
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35. Invitation
●
Valencia (Spain)
●
1st-5th December
● OGC Meeting
● eclipseDay
●
4th gvSIG Meeting
http://www.jornadasgvsig.gva.es
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36. WEDNESDAY 1 OCT FOSS4G 2008 – Cape Town, South Africa 36

37. gvSIG Mobile
How to code for desktop and mobile GIS/SDI
Thank you very much for your attention
Miguel Montesinos Javier Carrasco
mmontesinos@prodevelop.es jcarrasco@prodevelop.es
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38. http://creativecommons.org/licenses/by-nc-sa/3.0/legalcode
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