Implementing Additional Platform Support

In order to behave well on a given platform, OHR has to do certain things according to that platform's established conventions. Failure to do this will cause irritation to the user and possibly also mistakes because the app does not behave the way that the users expects.

I am aware of three ways in which OHR interacts with the host platform. These are summarised in the following table:

Interaction	Implementation
Files	the abstract class net.winnall.ohr.host.Host, which is overridden by platform-specific classes
UI	the SASS files, from which the CSS files used by JavaFX are generated; and JavaFX itself, which has some platform specific awareness (order of buttons, file and folder choosers, etc.)
Executable	pom.xml contains instructions (de.perdian.maven.plugins:macosappbundler-maven-plugin) to generate a MacOS application; something similar is needed for other platforms unless a simple JAR is adequate.

Overriding Host

The current version of OHR is aware of the the following platforms:

Platform	Overriding Class	Status
MacOS	MacOSHost	implemented
iOS	IOSHost	stub
Linux	LinuxHost	stub
Unix	UnixHost	stub
Windows	WindowsHost	stub

Host is implemented as a singleton and provides two general purpose methods and several methods for accessing application support files:

Method	Purpose
applyHostConventions	do any necessary initialisation to set up platform conventions (e.g. location of menu on screen)
getUserHome	return the name of user's login folder
---	---
getInputSupportFile	look for an application support file (also in JAR) and return it as an InputStream
getInputSupportFolderName	look for an application support folder and return it as an String
getOutputSupportFile	create an application support file and return it as an OutputStream
getInputHostSupportFile	look for an application support file (but not in JAR) and return it as an InputStream

It is assumed that application support files can be in:

1. user space
2. system space
3. OHR JAR file

and they are searched for in that order. This allows for system- and user-level overriding of the default settings in the OHR application. The following table illustrates how this works on MacOS and might work on other platforms:

OS	User Space	System Space
MacOS	~/Library/Application Support/OpenHAB Reporter/	/Library/Application Support/OpenHAB Reporter/
Linux	~/.ohr	/etc/ohr
Unix	~/.ohr	/etc/ohr

Overriding Host entails instantiating abstract methods, where necessary, and possibly overriding other methods to achieve an appropriate result as outlined above on the given platform whilst observing relevant platform conventions.