Moved to Plugins

ionic/plugins/plugin.ts

@@ -0,0 +1,50 @@
+export class NativePluginDecorator {
+  constructor(cls, config) {
+    this.cls = cls;
+    this.config = config;
+
+    cls.ifPlugin = (cb, returnType=null) => {
+      // Convert to boolean the plugin param
+      var exists = !!check;
+      if(typeof this.config.pluginCheck === 'function') {
+        exists = this.config.pluginCheck();
+      }
+      if(exists) {
+        return cb();
+      }
+
+      // We don't have the plugin, so print a warning message
+      cls.pluginWarn();
+
+      // If the user supplied a default return value, return it here.
+      return (typeof returnType === 'function') ? returnType() : returnType;
+    };
+
+    cls.pluginWarn = () => {
+      if(cls._pluginWarned) {
+        // Only warn once
+        return;
+      }
+
+      let platformString = [];
+      for(var k in this.config.platforms) {
+        platformString.push('\t' + k + ': '+ this.config.platforms[k]);
+      }
+      console.warn('Plugin for ' + this.config.name +
+      ' not installed. For native functionality, please install the correct plugin for your platform:\n' +
+      platformString.join('\n'));
+
+      // Set a flag so we don't warn again
+      cls._pluginWarned = true;
+    }
+  }
+}
+
+export function NativePlugin(config) {
+  return function(cls) {
+    var annotations = Reflect.getMetadata('annotations', cls) || [];
+    annotations.push(new NativePluginDecorator(cls, config));
+    Reflect.defineMetadata('annotations', annotations, cls);
+    return cls;
+  }
+}