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To use this class as an extension you will also need to create a plugins.xml file which describes your extension to JAS3. Here is an example plugins.xml file for the HelloWorld extension. This file must be saved in a directory called PLUGIN-inf (please create it).
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<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plugins SYSTEM "http://java.freehep.org/schemas/plugin/1.0/plugin.dtd">
<plugins>
<plugin>
<information>
<name>HelloWorld</name>
<author>Tutorial User</author>
<version>1.0</version>
<description kind="short">HelloWorld extension</description>
<description>Illustrates how to write a plugin.</description>
<load-at-start/>
</information>
<plugin-desc class="test.HelloWorldPlugin"/>
</plugin>
</plugins>
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Finally you need to compile your java file, and package it into a jar file. The easiest way to do this is using ant, a make-like system commonly used by Java projects. Here is an ant build.xml file which will package up your extension into a HelloWorld.jar file, and then install the extension into JAS3.
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<?xml version="1.0" encoding="UTF-8"?>
<project basedir="." default="all" name="JAS3Tutorial">
<target depends="init,compile,jar,deploy" name="all"/>
<target name="init">
<property name="phase" value="1"/>
<property name="srcDir" value="phase${phase}"/>
<property name="tmpDir" value="tmp/${phase}"/>
<property name="jas3Dir" value="/Program Files/Stanford Linear Accelerator Center/JAS3"/>
</target>
<target name="compile" depends="init">
<mkdir dir="${tmpDir}"/>
<javac srcdir="${srcDir}" destdir="${tmpDir}">
<classpath>
<fileset dir="${jas3Dir}">
<include name="lib/*.jar"/>
</fileset>
</classpath>
</javac>
</target>
<target name="jar" depends="compile">
<jar jarfile="HelloWorld.jar">
<fileset dir="${tmpDir}">
<include name="**/*.class"/>
</fileset>
<fileset dir=".">
<include name="PLUGIN-inf/plugins.xml"/>
</fileset>
</jar>
</target>
<target name="deploy" depends="jar">
<copy file="HelloWorld.jar" toDir="${user.home}/.JAS3/extensions"/>
</target>
<target name="clean" depends="init">
<delete dir="tmp"/>
</target>
</project>
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