override Element extension methods to also check for modifierExtensions

org.hl7.fhir.r5/src/main/java/org/hl7/fhir/r5/model/BackboneElement.java

@@ -241,6 +241,81 @@ Modifier extensions SHALL NOT change the meaning of any elements on Resource or
         
   }
 
+  public void addModifierExtension(String url, DataType value) {
+    if (isDisallowExtensions())
+      throw new Error("Extensions are not allowed in this context");
+    Extension ex = new Extension();
+    ex.setUrl(url);
+    ex.setValue(value);
+    getModifierExtension().add(ex);    
+  }
+
+
+   public Extension getExtensionByUrl(String theUrl) {
+     org.apache.commons.lang3.Validate.notBlank(theUrl, "theUrl must not be blank or null");
+     ArrayList<Extension> retVal = new ArrayList<Extension>();
+     Extension res = super.getExtensionByUrl(theUrl);
+     if (res != null) {
+       retVal.add(res);
+     }
+     for (Extension next : getModifierExtension()) {
+       if (theUrl.equals(next.getUrl())) {
+         retVal.add(next);
+       }
+     }
+     if (retVal.size() == 0)
+       return null;
+     else {
+       org.apache.commons.lang3.Validate.isTrue(retVal.size() == 1, "Url "+theUrl+" must have only one match");
+       return retVal.get(0);
+     }
+   }
+  
+   public void removeExtension(String theUrl) {
+     for (int i = getModifierExtension().size()-1; i >= 0; i--) {
+       if (theUrl.equals(getExtension().get(i).getUrl()))
+         getExtension().remove(i);
+     }
+     super.removeExtension(theUrl);
+   }
+   
+
+   /**
+    * Returns an unmodifiable list containing all extensions on this element which 
+    * match the given URL.
+    * 
+    * @param theUrl The URL. Must not be blank or null.
+    * @return an unmodifiable list containing all extensions on this element which 
+    * match the given URL
+    */
+   public List<Extension> getExtensionsByUrl(String theUrl) {
+     org.apache.commons.lang3.Validate.notBlank(theUrl, "theUrl must not be blank or null");
+     ArrayList<Extension> retVal = new ArrayList<Extension>();
+     retVal.addAll(super.getExtensionsByUrl(theUrl));
+     for (Extension next : getModifierExtension()) {
+       if (theUrl.equals(next.getUrl())) {
+         retVal.add(next);
+       }
+     }
+     return java.util.Collections.unmodifiableList(retVal);
+   }
+   
+   public boolean hasExtension(String theUrl) {
+     return !getExtensionsByUrl(theUrl).isEmpty(); 
+   }
+
+
+  public String getExtensionString(String theUrl) throws FHIRException {
+    List<Extension> ext = getExtensionsByUrl(theUrl); 
+    if (ext.isEmpty()) 
+      return null; 
+    if (ext.size() > 1) 
+      throw new FHIRException("Multiple matching extensions found");
+    if (!ext.get(0).getValue().isPrimitive())
+      throw new FHIRException("Extension could not be converted to a string");
+    return ext.get(0).getValue().primitiveValue();
+  }
+
 // end addition
 
 }