gwt/org/danvk/Dygraphs.java

   1 package org.danvk;
   2
   3 import com.google.gwt.core.client.GWT;
   4 import com.google.gwt.dom.client.Document;
   5 import com.google.gwt.dom.client.ScriptElement;
   6 import com.google.gwt.resources.client.ClientBundle;
   7 import com.google.gwt.resources.client.TextResource;
   8
   9 /**
  10  * Methods for installing Dygraphs source in a GWT document.
  11  *
  12  * @author flooey@google.com (Adam Vartanian)
  13  */
  14 public class Dygraphs {
  15
  16   // Protected because the GWT compiler has to generate a subclass.
  17   protected interface Resources extends ClientBundle {
  18     @Source("org/danvk/dygraph-combined.js")
  19     TextResource dygraphs();
  20   }
  21
  22   private static final Resources RESOURCES = GWT.create(Resources.class);
  23   private static boolean installed = false;
  24
  25   /**
  26    * Install the Dygraphs JavaScript source into the current document.  This
  27    * method is idempotent.
  28    */
  29   public static synchronized void install() {
  30     if (!installed) {
  31       ScriptElement e = Document.get().createScriptElement();
  32       e.setText(RESOURCES.dygraphs().getText());
  33       Document.get().getBody().appendChild(e);
  34       installed = true;
  35     }
  36   }
  37
  38   // Prevent construction
  39   private Dygraphs() { }
  40
  41 }