Supplemental information for JOSM -- the Java OpenStreetMap Editor

=============================================================================
            I. Install & Launch
=============================================================================

Installation notes
------------------
To run JOSM, you need:

* The JOSM .jar file, e.g., josm-tested.jar or josm-latest.jar
* Java Runtime Environment (JRE) 11, or later.


How to get Java Runtime Environment
-----------------------------------
You need JRE Version 11, or later.

Microsoft Windows and Apple macOS users should visit one of:
- https://www.azul.com/downloads/?package=jdk#download-openjdk
- https://bell-sw.com/pages/downloads/#mn
and download the latest Java executable for their system.

Linux users should visit http://www.oracle.com/technetwork/java/index.html
There is a Linux binary installer, which you must execute from a console, or
use the mechanism of your distribution's packaging system.


How to launch
-------------
Microsoft Windows users launch by double-clicking on the .jar file.
If this does not work, open a command shell and type
"java -jar josm-latest.jar"  in the directory that holds the file. (Please
replace josm-latest.jar with the name of your .jar file, if you aren't using
the latest version.)

Under Linux, open a shell, go to the file directory and type
"java -jar josm-latest.jar" to launch. If this does not work, try to set
your JAVA_HOME variable to the java executable location (the root location,
not the bin).

macOS users just click on the .jar file icon.

=============================================================================
            II. Development
=============================================================================

How to get the source code
--------------------------
Download it directly from the subversion at
https://josm.openstreetmap.de/svn/trunk. To use the command line subversion
client, type

svn co https://josm.openstreetmap.de/svn/trunk josm


Files & directories
-------------------
This is an overview of the files and directories in the JOSM code repository:
- build.xml                 ant build file (standard way to create a JOSM binary)
- CONTRIBUTION              list of major code contributors
- gpl-2.0.txt, gpl-3.0.txt  full text of the GNU General Public License
- LICENSE                   the JOSM license terms
- native/                   OS-specific files
  - linux/                  files useful for Linux distributions, including Appdata files, .desktop
                            files, Debian/Ubuntu scripts, man pages, icons, etc.
  - macosx/                 files needed to create the MacOS package
  - windows/                files needed to create the Windows installer
  - josm.jnlp               Java Web Start launcher file (used on the website for the tested version)
  - josm-latest.jnlp        Java Web Start launcher file (used on the website for the latest version)
- nodist/                   files not included in JOSM binary
  - data/                   data files that are useful for development, but not distributed
    - exif-direction-example.jpg
                            sample image, that contains direction information in the EXIF header
                            (keys: Exif.GPSInfo.GPSImgDirectionRef, Exif.GPSInfo.GPSImgDirection)
    - filterTests.osm       used for unit testing of the filter feature
                            (see test/unit/org/openstreetmap/josm/data/osm/FilterTest.java)
    - Join_Areas_Tests.osm  some examples to test the 'join areas' feature
    - *.*                   various other data files used for unit testing and as reference file
    - projection/           projection files
      - *.gsb               NTv2 grid files for projection support, downloaded by the
                            client on demand (see CONTRIBUTION)
      - CHENyx06-Distribution.pdf
                            archive of terms of use for the CHENyx06.gsb file
      - epsg                EPSG data file, taken from the proj.4 project
                            (see https://github.com/OSGeo/proj.4/blob/master/nad/epsg)
      - esri                ESRI data file, taken from the proj.4 project
                            (see https://github.com/OSGeo/proj.4/blob/master/nad/esri)
      - josm-epsg           customizations to the epsg file, used together with the epsg file
                            to generate data/projection/custom-epsg
                            
      - projection-reference-data.csv
                            reference data for projection tests
                            (see test/unit/org/openstreetmap/josm/data/projection/ProjectionRefTest.java)
      - projection-regression-test-data.csv
                            regression data for projection tests
                            (see test/unit/org/openstreetmap/josm/data/projection/ProjectionRegressionTest.java)
    - trans/*.lang          translation data for files that are not distributed, but used
                            by the server for localization of the services;
                            currently contains plugin descriptions in order to include translations
                            in the downloaded plugin list
  - images/                 images, which are not for distribution, but may be useful later (e.g. high
                            resolution and vector versions)
  - styles/                 files needed for map style maintenance
- README                    this file
- resources/                resource files that will be included in the JOSM jar file
  - data/                   data files that will be included in the JOSM jar file
    - fonts/                font files used for map rendering
    - gpx/                  different color gradients for gpx drawing
    - projection/           projection files
      - custom-epsg         list of projection definitions, auto-generated file created by ant task 'epsg'
    - security/*.pem        certificates that we like to accept for TLS connections, but are missing in the
                            default Java certificate store
    - validator/            data files used by the JOSM validator
      - *.cfg               files designed for the old tagchecker, still in use
      - *.mapcss            default validation rules for the MapCSS-based tagchecker
    - boundaries.osm        OSM file containing boundary data for the states of the earth, including
                            data for right and left-hand traffic
    - defaultpresets.xml    data file for the core tagging presets
    - help-browser.css      CSS file for the help sites (HTML content is downloaded from the website
                            on demand, but displayed inside the programm in a Java web browser component.)
    - *.lang                translation data
    - *.xsd                 xml schema files for validation of configuration files
  - images/                 images distributed with the JOSM binary
    - icons                 images for the Potlatch 2 style
    - presets               images for the main mappaint style and the internal presets
  - styles/                 map styles included in JOSM
- scripts/                  various scripts used by JOSM developers
  - BuildProjectionDefinitions.java
                            called from the ant build file to combine the files epsg and josm-epsg
                            to create the custom-epsg file for distribution
  - geticons.pl             tool to find all used icons and allows deleting unused icons
                            searches also for images with incompatible svg code
  - optimize-images         short script to decrease size of PNG images
  - since_xxx.py            developer tool to replace "@since xxx" in Javadoc by the upcoming revision number
  - SyncEditorLayerIndex.java
                            script to compare and analyse the differences of the editor layer index and the
                            JOSM imagery list (see https://josm.openstreetmap.de/wiki/ImageryCompare)
  - TagInfoExtract.java     extracts tag information for the taginfo project
- src/                      the source code of the application
- start.html                HTML page to run the applet version of JOSM
- test/                     automated software tests
    - data/                 resources used for some tests
    - functional/           functional tests (source code)
    - lib/                  libraries needed for (some of) the tests, including JUnit
    - performance/          performance tests (source code)
    - unit/                 unit tests (source code)
- tools/                    libraries, tools and configuration files that help in the development process
    - checkstyle/           libs and config files for checkstyle (automatically detects code style
                            problems in source code); can be launched as an ant target in build.xml
    - eclipse/              preconfigured Eclipse configuration files
    - ivy/                  Apache Ivy binary, configuration file, and downloaded dependencies 
    - jacocoant.jar         used to include coverage data into JUnit test reports
    - japicc/               used to generate a compatibility report between optimized jar and normal one
    - netbeans/             preconfigured Netbeans project
    - pmd/                  config files for PMD (source code analyzer, finds common programming flaws)
    - spotbugs/             libs and config files for spotbugs (automatically detects common bugs and potential
                            problems in source code); can be launched as an ant target in build.xml

Third party libraries
---------------------
There are some third party libraries which are directly included in the source code tree, in particular:

* jmapviewer: Java component to browse a TMS map
    src/org/openstreetmap/gui (svn external)
    -> https://josm.openstreetmap.de/osmsvn/applications/viewer/jmapviewer/
* Apache commons compress: Support for bzip2 compression when opening files
    -> https://github.com/apache/commons-compress
* Apache commons validator: Improved validator routines
    src/org/openstreetmap/josm/data/validation/routines
    -> http://commons.apache.org/proper/commons-validator
* SVG Salamander: Support for SVG image format
    -> https://github.com/blackears/svgSalamander
* Metadata Extractor: Read EXIF Metadata of photos
    -> https://github.com/drewnoakes/metadata-extractor
* MultiSplitPane: Small lib for GUI layout management
    src/org/openstreetmap/josm/gui/MultiSplitLayout.java, MultiSplitPane.java
    -> https://github.com/floscher/multi-split
    -> https://community.oracle.com/docs/DOC-983539
* swinghelper: Class CheckThreadViolationRepaintManager to find EDT violations
    src/org/openstreetmap/josm/gui/util/CheckThreadViolationRepaintManager.java
    -> https://github.com/floscher/swinghelper
* xz extractor (0BSD)
    -> https://tukaani.org/xz/java.html
* OpeningHoursParser (MIT license)
    -> https://github.com/simonpoole/OpeningHoursParser