Basic processing in place with template

Needs more error checking and debug prints removed
Signed-off-by: Daniel Bluhm <bluhmdj@ornl.gov>

org.eclipse.ice.dev.annotations/src/main/java/org/eclipse/ice/dev/annotations/processors/DataElementProcessor.java

@@ -2,47 +2,217 @@ package org.eclipse.ice.dev.annotations.processors;
 
 import java.io.FileWriter;
 import java.io.IOException;
+import java.lang.annotation.Annotation;
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+import java.util.Optional;
+import java.util.Properties;
 import java.util.Set;
-import javax.annotation.processing.*;
+import java.util.stream.Collectors;
+
+import javax.annotation.processing.AbstractProcessor;
+import javax.annotation.processing.Messager;
+import javax.annotation.processing.ProcessingEnvironment;
+import javax.annotation.processing.Processor;
+import javax.annotation.processing.RoundEnvironment;
+import javax.annotation.processing.SupportedAnnotationTypes;
+import javax.annotation.processing.SupportedSourceVersion;
 import javax.lang.model.SourceVersion;
+import javax.lang.model.element.AnnotationMirror;
+import javax.lang.model.element.AnnotationValue;
 import javax.lang.model.element.Element;
+import javax.lang.model.element.ExecutableElement;
 import javax.lang.model.element.TypeElement;
+import javax.lang.model.element.VariableElement;
+import javax.lang.model.type.TypeMirror;
+import javax.lang.model.util.Elements;
+import javax.lang.model.util.SimpleAnnotationValueVisitor8;
 import javax.tools.Diagnostic;
 
+import org.apache.velocity.VelocityContext;
+import org.apache.velocity.app.Velocity;
+import org.apache.velocity.exception.MethodInvocationException;
+import org.apache.velocity.exception.ParseErrorException;
+import org.apache.velocity.exception.ResourceNotFoundException;
+import org.eclipse.ice.dev.annotations.DataField;
+import org.eclipse.ice.dev.annotations.DataFields;
+
 import com.google.auto.service.AutoService;
 
 @SupportedAnnotationTypes("org.eclipse.ice.dev.annotations.DataElement")
 @SupportedSourceVersion(SourceVersion.RELEASE_8)
 @AutoService(Processor.class)
 public class DataElementProcessor extends AbstractProcessor {
-	
+
+	private static final String template = "templates/DataElement.vm";
 	protected Messager messager;
-	
-	
-    @Override
-    public void init(ProcessingEnvironment env) {
-        messager = env.getMessager();
-        super.init(env);
-    }
-	
-	@Override
-	public boolean process(Set<? extends TypeElement> annotations, RoundEnvironment roundEnv) {
 
-		messager.printMessage(Diagnostic.Kind.NOTE, "Printing: ");
-		
-		for (TypeElement te : annotations)
-			for (Element e : roundEnv.getElementsAnnotatedWith(te))
-				messager.printMessage(Diagnostic.Kind.NOTE, "Printing: " + e.toString());
+	public class Fields {
+		public class Field {
+			String name;
+			String className;
+			public void setName(String name) {
+				this.name = name;
+			}
+			public void setClassName(String className) {
+				this.className = className;
+			}
+			public String getName() {
+				return name;
+			}
+			public String getClassName() {
+				return className;
+			}
+			@Override
+			public String toString() {
+				return "Field [name=" + name + ", className=" + className + "]";
+			}
+		}
+
+		protected List<Field> fields;
+		protected Field building;
+
+		public Fields() {
+			this.fields = new ArrayList<Field>();
+			this.building = null;
+		}
+
+		public void begin() {
+			this.building = new Field();
+		}
+
+		public void setName(String name) {
+			this.building.setName(name);
+		}
+
+		public void setClassName(String className) {
+			this.building.setClassName(className);
+		}
+
+		public void finish() {
+			this.fields.add(this.building);
+			this.building = null;
+		}
+
+		@Override
+		public String toString() {
+			return fields.toString();
+		}
+
+		public List<Field> getFields() {
+			return fields;
+		}
+	}
+
+	private class FieldVisitor extends SimpleAnnotationValueVisitor8<Void, Fields> {
 
+		protected final Elements elementUtils;
+
+		FieldVisitor(Elements elementUtils) {
+			this.elementUtils = elementUtils;
+		}
+
+		@Override
+		protected Void defaultAction(Object o, Fields f) {
+			System.out.println("Default action: " + o.toString());
+			return null;
+		}
+
+		@Override
+		public Void visitString(String s, Fields f) {
+			System.out.printf(">> stringValue: %s\n", s);
+			f.setName(s);
+			return null;
+		}
+
+		@Override
+		public Void visitAnnotation(AnnotationMirror a, Fields f) {
+			System.out.printf(">> annotationTypeValue: %s\n", a.toString());
+			if (a.getAnnotationType().toString().equals(DataField.class.getCanonicalName())) {
+				final Map<? extends ExecutableElement, ? extends AnnotationValue> elementValues =
+						elementUtils.getElementValuesWithDefaults(a);
+				f.begin();
+				for (Map.Entry<? extends ExecutableElement, ? extends AnnotationValue> entry
+						: elementValues.entrySet()) {
+					entry.getValue().accept(this, f);
+				}
+				f.finish();
+			}
+			return null;
+		}
+
+		@Override
+		public Void visitType(TypeMirror t, Fields f) {
+			System.out.printf(">> classValue: %s\n", t.toString());
+			f.setClassName(t.toString());
+			return null;
+		}
+
+		@Override
+		public Void visitArray(List<? extends AnnotationValue> vals, Fields f) {
+			for (AnnotationValue val : vals) {
+				val.accept(this, f);
+			}
+			return null;
+		}
+	}
+
+	@Override
+	public void init(ProcessingEnvironment env) {
+		messager = env.getMessager();
+		super.init(env);
+	}
+
+	private void writeClass(String className, Fields fields) {
+		VelocityContext context = new VelocityContext();
+		context.put("className", className);
+		context.put("fields", fields.getFields());
+		FileWriter writer;
 		try {
-			FileWriter writer = new FileWriter("/home/bkj/test.txt");
-			writer.write("Howdy!");
+			writer = new FileWriter("/tmp/test.txt");
+			Properties p = new Properties();
+			p.setProperty("resource.loader", "class");
+			p.setProperty(
+				"class.resource.loader.class",
+				"org.apache.velocity.runtime.resource.loader.ClasspathResourceLoader"
+			);
+			Velocity.init(p);
+			Velocity.mergeTemplate(template, "UTF-8", context, writer);
+			writer.flush();
 			writer.close();
-		} catch (IOException e) {
+		} catch (IOException | ParseErrorException | MethodInvocationException | ResourceNotFoundException e) {
 			// TODO Auto-generated catch block
 			e.printStackTrace();
 		}
-		return false;
 	}
 
+	@Override
+	public boolean process(Set<? extends TypeElement> annotations, RoundEnvironment roundEnv) {
+		final Elements elementUtils = this.processingEnv.getElementUtils();
+		FieldVisitor valueVisitor = new FieldVisitor(elementUtils);
+
+		for (TypeElement annotation : annotations) {
+			for (Element elem : roundEnv.getElementsAnnotatedWith(annotation)) {
+				if (!elem.getKind().isInterface()) {
+					messager.printMessage(Diagnostic.Kind.ERROR, "DataElement annotation is only for interfaces");
+					return false;
+				}
+				Fields fields = new Fields();
+				List<? extends AnnotationMirror> annotationMirrors = elem.getAnnotationMirrors();
+				for (AnnotationMirror annotationMirror : annotationMirrors) {
+					final Map<? extends ExecutableElement, ? extends AnnotationValue> elementValues =
+							elementUtils.getElementValuesWithDefaults(annotationMirror);
+					for (Map.Entry<? extends ExecutableElement, ? extends AnnotationValue> entry
+							: elementValues.entrySet()) {
+						entry.getValue().accept(valueVisitor, fields);
+					}
+				}
+				this.writeClass(elem.getSimpleName().toString(), fields);
+			}
+		}
+		return true;
+	}
 }

org.eclipse.ice.dev.annotations/src/main/resources/templates/DataElement.vm

+public class ${className}Implementation implements ${className} {
+#foreach($field in $fields)
+	protected ${field.ClassName} ${field.Name};
+#end
+
+	public static void main(String[] args) {
+		System.out.println("Hello, world!");
+	}
+}

rse-renderer-client-test/pom.xml

@@ -10,8 +10,10 @@
 	<packaging>jar</packaging>
 
 	<properties>
-		<maven.compiler.source>1.8</maven.compiler.source>
-		<maven.compiler.target>1.8</maven.compiler.target>
+        <java.version>11</java.version>
+		<maven.compiler.source>11</maven.compiler.source>
+		<maven.compiler.target>11</maven.compiler.target>
+        <maven.compiler.release>11</maven.compiler.release>
 		<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
 		<project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
 
@@ -115,6 +117,10 @@
 					<groupId>com.vaadin</groupId>
 					<artifactId>vaadin-core</artifactId>
 				</exclusion>
+				<exclusion>
+					<groupId>ch.qos.logback</groupId>
+					<artifactId>logback-classic</artifactId>
+				</exclusion>
 				<exclusion>
 					<groupId>ch.qos.logback</groupId>
 					<artifactId>logback-core</artifactId>
@@ -280,4 +286,4 @@
 		</profile>
 
 	</profiles>
-</project>
\ No newline at end of file
+</project>