Added a TextualBody class and the parsing of a bodyValue property def…

…ined

on an annotation to a TextualBody resource as an annotation body

src/Annotation.ts

@@ -5,7 +5,8 @@ import {
   IManifestoOptions,
   ManifestResource,
   Resource,
-  SpecificResource
+  SpecificResource,
+  TextualBody
 } from "./internal";
 
 import { Vector3 } from "threejs-math";
@@ -23,6 +24,28 @@ export class Annotation extends ManifestResource {
   **/
   getBody(): ( AnnotationBody | SpecificResource) [] {
     let bodies: ( AnnotationBody | SpecificResource)[] = [];
+
+    /*
+    A bodyValue property in the annotation json will short circuit
+    the parsing process and be interpreted as a shorthand version of
+    a TextualBody resource defining as the body
+    
+    This procedure is allowed, see Web Annotation Data Model section 3.2.5
+    https://www.w3.org/TR/annotation-model/#string-body
+    */
+
+    var stringBody : string | undefined = this.getProperty("bodyValue");
+    //console.log("retrieved stringBody " + stringBody);
+    if (stringBody){
+        return [new TextualBody(
+            { "id" : "https://example.com/TextualBody/1",
+              "value" : stringBody,
+              "type"  : "TextualBody"
+            },
+            this.options
+        )];
+    }
+
     const body: any = this.getProperty("body");
 
     // the following is intended to handle the following cases for

src/TextualBody.ts

@@ -0,0 +1,30 @@
+import { 
+    IManifestoOptions, 
+    AnnotationBody} from "./internal";
+
+/**
+An implementation of the TextualBody class (class in JSON-LD sense)
+as it is described in Web Annotation Data Model Section 3.2.4
+https://www.w3.org/TR/annotation-model/#embedded-textual-body
+**/
+export class TextualBody extends AnnotationBody {
+  constructor(jsonld?: any, options?: IManifestoOptions) {
+    super(jsonld, options);
+    this.isModel  = false;
+    this.isLight  = false;
+    this.isCamera  = false;
+  }
+
+/**
+identify an instance of this typescript as representing a resource
+having these json-ld Class relationships.
+**/
+get isTextualBody() : boolean { return true;}
+get isText() : boolean {return true;}
+
+/**
+The simple string that is the data content of this resource
+will return empty string as a default value
+**/
+get Value(): string {return this.getProperty("value") || "" ;}
+}

src/internal.ts

@@ -10,6 +10,7 @@ export * from "./SpecificResource";
 export * from "./AnnotationBody";
 export * from "./Light";
 export * from "./Camera";
+export * from "./TextualBody";
 export * from "./AnnotationBodyParser";
 export * from "./Annotation";