WebAnnotation API tweaks

src/WebAnnotation.js

@@ -1,7 +1,7 @@
 export default class WebAnnotation {
 
   constructor(annotation) {
-    this._annotation = annotation;
+    this.underlying = annotation;
   }
 
   /** For convenience - creates an empty web annotation **/
@@ -17,19 +17,19 @@ export default class WebAnnotation {
 
   /** Creates a copy of this annotation **/
   clone = opt_props => {
-    return new WebAnnotation({ ...this._annotation, ...opt_props});
+    return new WebAnnotation({ ...this.underlying, ...opt_props});
   }
 
   /** An equality check based on the underlying object or (if given) ID **/
   isEqual(other) {
     if (!other) {
       return false;
-    } else if (this._annotation === other._annotation) {
+    } else if (this.underlying === other.underlying) {
       return true;
-    } else if (!this._annotation.id || !other._annotation.id) {
+    } else if (!this.underlying.id || !other.underlying.id) {
       return false;
     }
-    return this._annotation.id === other._annotation.id
+    return this.underlying.id === other.underlying.id
   }
 
   /*************************************/ 
@@ -38,40 +38,40 @@ export default class WebAnnotation {
   /*************************************/
 
   get id() {
-    return this._annotation.id; 
+    return this.underlying.id; 
   }
 
   get type() {
-    return this._annotation.type;
+    return this.underlying.type;
   }
 
   get motivation() {
-    return this._annotation.motivation;
+    return this.underlying.motivation;
   }
 
   get body() {
-    return this._annotation.body;
+    return this.underlying.body;
   }
 
   get target() {
-    return this._annotation.target;
+    return this.underlying.target;
   }
 
   /** Same as .body, but guaranteed to return an array **/
   get bodies() {
-    return (Array.isArray(this._annotation.body)) ?
-      this._annotation.body : [ this._annotation.body ];
+    return (Array.isArray(this.underlying.body)) ?
+      this.underlying.body : [ this.underlying.body ];
   }
 
   /** Only bodies are meant to be mutated by the application **/
   set bodies(bodies) {
-    this._annotation.body = bodies;
+    this.underlying.body = bodies;
   }
 
   /** Same as .target, but guaranteed to return an array **/
   get targets() {
-    return (Array.isArray(this._annotation.target)) ?
-      this._annotation.target : [ this._annotation.target ];
+    return (Array.isArray(this.underlying.target)) ?
+      this.underlying.target : [ this.underlying.target ];
   }
   
   /*****************************************/ 
@@ -80,8 +80,15 @@ export default class WebAnnotation {
 
   /** Selector of the given type **/
   selector = type => {
-    return this._annotation.target.selector && 
-      this._annotation.target.selector.find(t => t.type === type);
+    const { target } = this.underlying;
+
+    if (target.selector) {
+      // Normalize to array
+      const selectors = Array.isArray(target.selector) ?
+        target.selector : [ target.selector ];
+
+      return selectors.find(s => s.type === type);
+    }
   }
 
   /** Shorthand for the 'exact' field of the TextQuoteSelector **/