public code v1

plugins/afryca.ase.engine.Jython/src/afryca/ase/engine/Jython/Jython.java

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+package afryca.ase.engine.Jython;
+
+import javax.script.ScriptException;
+
+import org.python.jsr223.PyScriptEngine;
+
+import afryca.ase.engine.IEngine;
+
+/**
+ * Jython engine for ASE
+ * 
+ * @author Sinbad²
+ * @version 3.0
+ */
+public class Jython implements IEngine {
+	
+	public static final String ID = "Jython"; //$NON-NLS-1$
+
+	private PyScriptEngine engine;
+	private String name;
+
+	private Jython() {
+		super();
+		name = ID;
+		engine = null;
+	}
+
+	/**
+	 * Build Jython engine
+	 * 
+	 * @param engine
+	 *            jython engine
+	 */
+	public Jython(PyScriptEngine engine) {
+		this();
+		assert engine != null;
+		this.engine = engine;
+	}
+	
+	@Override
+	public String getName() {
+		return name;
+	}
+
+	@Override
+	public Object getEngine() {
+		return engine;
+	}
+	
+	@Override
+	public Object eval(String script) throws ScriptException {
+		return engine.eval(script);
+	}
+
+	@Override
+	public void end() {
+		engine = null;
+	}
+
+}

plugins/afryca.ase.engine.Jython/src/afryca/ase/engine/Jython/addon/JythonEngineAddon.java

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+package afryca.ase.engine.Jython.addon;
+
+import javax.annotation.PostConstruct;
+import javax.inject.Inject;
+
+import org.eclipse.core.runtime.IProgressMonitor;
+import org.eclipse.core.runtime.IStatus;
+import org.eclipse.core.runtime.Status;
+import org.eclipse.core.runtime.jobs.Job;
+
+import afryca.ase.engine.IEngine;
+import afryca.ase.engine.Jython.provider.IJythonEngineProvider;
+import afryca.ase.service.IASEService;
+
+/**
+ * Jython engine add-on
+ * 
+ * @author Sinbad²
+ * @version 3.0
+ */
+public class JythonEngineAddon {
+	
+	@Inject
+	private IASEService aseService;
+
+	@Inject
+	private IJythonEngineProvider jythonEngineProvider;
+	
+	@PostConstruct
+	private void addEngine() {
+		addEngineJob(IJythonEngineProvider.JYTHON);
+	}
+	
+	private void addEngineJob(String scriptName) {
+		Job job = new Job(scriptName) {
+			@Override
+			protected IStatus run(IProgressMonitor monitor) {
+				IEngine engine = getEngine();
+				if (engine != null) {
+					aseService.addEngine(engine);
+					return Status.OK_STATUS;
+				}
+				return Status.CANCEL_STATUS;
+			}
+		};
+		job.schedule();
+	}
+	
+	private IEngine getEngine() {
+		return jythonEngineProvider.getEngine();
+	}
+}

plugins/afryca.ase.engine.Jython/src/afryca/ase/engine/Jython/provider/IJythonEngineProvider.java

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+package afryca.ase.engine.Jython.provider;
+
+import afryca.ase.engine.IEngine;
+
+/**
+ * Jython engine provider interface
+ * 
+ * @author Sinbad²
+ * @version 3.0
+ */
+public interface IJythonEngineProvider {
+	
+	public static final String JYTHON = "Jython"; //$NON-NLS-1$
+
+	/**
+	 * Return Jython engine instance
+	 * 
+	 * @return Jython engine instance
+	 */
+	IEngine getEngine();
+}

plugins/afryca.ase.engine.Jython/src/afryca/ase/engine/Jython/provider/internal/JythonEngineDefaultProvider.java

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+package afryca.ase.engine.Jython.provider.internal;
+
+import java.io.IOException;
+import java.net.URL;
+import java.util.Properties;
+
+import javax.annotation.PostConstruct;
+import javax.inject.Inject;
+import javax.script.ScriptEngine;
+
+import org.eclipse.core.runtime.FileLocator;
+import org.eclipse.core.runtime.IProgressMonitor;
+import org.eclipse.core.runtime.IStatus;
+import org.eclipse.core.runtime.Path;
+import org.eclipse.core.runtime.Status;
+import org.eclipse.core.runtime.jobs.Job;
+import org.eclipse.e4.core.contexts.IEclipseContext;
+import org.osgi.framework.Bundle;
+import org.osgi.framework.FrameworkUtil;
+import org.python.jsr223.PyScriptEngine;
+import org.python.jsr223.PyScriptEngineFactory;
+import org.python.util.PythonInterpreter;
+
+import afryca.ase.engine.IEngine;
+import afryca.ase.engine.Jython.Jython;
+import afryca.ase.engine.Jython.provider.IJythonEngineProvider;
+
+/**
+ * Jython engine default provider
+ * 
+ * @author Sinbad²
+ * @version 3.0
+ */
+public class JythonEngineDefaultProvider implements IJythonEngineProvider {
+
+	private static final String PYTHON_HOME = "python.home"; //$NON-NLS-1$
+
+	@Inject
+	private IEclipseContext context;
+
+	private IEclipseContext topContext;
+
+	private Jython engine;
+	
+	private Job job;
+
+	@PostConstruct
+	private void initialize() {
+		getTopContext();
+		createEngineJob(JYTHON);
+	}
+
+	private void getTopContext() {
+		IEclipseContext parent = context;
+		do {
+			topContext = parent;
+			parent = topContext.getParent();
+		} while (parent != null);
+	}
+
+	@Override
+	public IEngine getEngine() {
+		try {
+			job.join();
+		} catch (InterruptedException e) {
+			// Nothing to do
+		}
+		return (afryca.ase.engine.IEngine) topContext.get(JYTHON);
+	}
+	
+	private void createEngineJob(String scriptName) {
+		job = new Job(scriptName) {
+			@Override
+			protected IStatus run(IProgressMonitor monitor) {
+				createEngine();
+				return (topContext.get(scriptName) != null)
+						? Status.OK_STATUS
+						: Status.CANCEL_STATUS;
+			}
+		};
+		job.schedule();
+	}
+
+	private void createEngine() {
+		ScriptEngine scriptEngine = null;
+		String home = getPythonHome();
+		if (home != null) {
+			Properties postProperties = new Properties();
+			postProperties.put(PYTHON_HOME, home);
+			PythonInterpreter.initialize(System.getProperties(), postProperties, null);
+			PyScriptEngineFactory factory = new PyScriptEngineFactory();
+			try {
+				scriptEngine = factory.getScriptEngine();
+			} catch(Exception e) {
+				//Nothing to do
+			}
+		}
+		topContext.set(JYTHON, (scriptEngine != null)
+				? new Jython((PyScriptEngine) scriptEngine)
+				: null);
+	}
+
+	private static String getPythonHome() {
+		try {
+			Bundle bundle = FrameworkUtil.getBundle(PythonInterpreter.class);
+			URL url = FileLocator.find(bundle, new Path("."), null); //$NON-NLS-1$
+			return FileLocator.toFileURL(url).getFile();
+		} catch (IOException ioException) {
+			return null;
+		}
+	}
+
+	public void end() {
+		if (engine != null) {
+			engine.end();
+		}
+	}
+}

plugins/afryca.ase.engine.Jython/src/afryca/ase/engine/Jython/provider/internal/JythonEngineProviderContextFunction.java

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+package afryca.ase.engine.Jython.provider.internal;
+
+import org.eclipse.e4.core.contexts.ContextFunction;
+import org.eclipse.e4.core.contexts.ContextInjectionFactory;
+import org.eclipse.e4.core.contexts.IEclipseContext;
+import org.eclipse.e4.ui.model.application.MApplication;
+
+import afryca.ase.engine.Jython.provider.IJythonEngineProvider;
+
+/**
+ * Jython engine provider context function
+ * 
+ * @author Sinbad²
+ * @version 3.0
+ */
+public class JythonEngineProviderContextFunction extends ContextFunction {
+	@Override
+	public Object compute(IEclipseContext context, String contextKey) {
+		IJythonEngineProvider jythonEngineProvider = ContextInjectionFactory.make(JythonEngineDefaultProvider.class,
+				context);
+		MApplication application = context.get(MApplication.class);
+		IEclipseContext applicationContext = application.getContext();
+		applicationContext.set(IJythonEngineProvider.class, jythonEngineProvider);
+		return jythonEngineProvider;
+	}
+
+}