Enable configuring @type attribute for JSON payload in Maven plugin

Author: atextor

documentation/developer-guide/modules/tooling-guide/pages/maven-plugin.adoc

@@ -524,6 +524,7 @@ Configuration Properties:
 | `modelsRootDirectory` | The path to the root directory containing the Aspect Model file(s). | `String` | `$\{basedir}/src/main/resources/aspects` | {nok}
 | `includes` | A list of Aspect Model URNs identifying the Aspect Models to be included in the plugin execution. | `String` | none | {ok}
 | `outputDirectory` | The path to the directory where the generated JSON payload will be written to. | `String` | none | {ok}
+| `addTypeAttribute` | Adds a `@type` attribute for inherited Entities | `Boolean` | `false` | {ok}
 |===
 
 === Generating JSON-LD representation of an Aspect Model

tools/esmf-aspect-model-maven-plugin/src/main/java/org/eclipse/esmf/aspectmodel/GenerateJsonPayload.java

@@ -16,26 +16,35 @@
 import java.util.Set;
 
 import org.eclipse.esmf.aspectmodel.generator.json.AspectModelJsonPayloadGenerator;
+import org.eclipse.esmf.aspectmodel.generator.json.JsonPayloadGenerationConfig;
+import org.eclipse.esmf.aspectmodel.generator.json.JsonPayloadGenerationConfigBuilder;
 import org.eclipse.esmf.metamodel.Aspect;
 
 import org.apache.maven.plugin.MojoExecutionException;
 import org.apache.maven.plugin.MojoFailureException;
 import org.apache.maven.plugins.annotations.LifecyclePhase;
 import org.apache.maven.plugins.annotations.Mojo;
+import org.apache.maven.plugins.annotations.Parameter;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
 @Mojo( name = "generateJsonPayload", defaultPhase = LifecyclePhase.GENERATE_RESOURCES )
 public class GenerateJsonPayload extends AspectModelMojo {
    private static final Logger LOG = LoggerFactory.getLogger( GenerateJsonPayload.class );
 
+   @Parameter( defaultValue = "false" )
+   private boolean addTypeAttribute;
+
    @Override
    public void executeGeneration() throws MojoExecutionException, MojoFailureException {
       validateParameters();
 
       final Set<Aspect> aspects = loadAspects();
       for ( final Aspect context : aspects ) {
-         final AspectModelJsonPayloadGenerator generator = new AspectModelJsonPayloadGenerator( context );
+         final JsonPayloadGenerationConfig config = JsonPayloadGenerationConfigBuilder.builder()
+               .addTypeAttributeForEntityInheritance( addTypeAttribute )
+               .build();
+         final AspectModelJsonPayloadGenerator generator = new AspectModelJsonPayloadGenerator( context, config );
          generator.generate( name -> getOutputStreamForFile( name + ".json", outputDirectory ) );
       }
       LOG.info( "Successfully generated example JSON payloads for Aspect Models." );