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gaia/apps/system/lockscreen/js/state/lockscreen_basic_state.js

@@ -0,0 +1,71 @@
+/* global Stream */
+'use strict';
+
+(function(exports) {
+  var LockScreenBasicState = function(component) {
+    // Replace with the name of concrete state.
+    this.configs = {
+      name: 'LockScreenBasicState',
+      // Note the event means events forwarded from sources, not DOM events.
+      stream: {
+        events: [],
+        interrupts: [],
+        sources: []
+      }
+    };
+    // Component reference proivdes every resource & property
+    // need by all states.
+    this.component = component;
+  };
+
+  /**
+   * Stream' phase is the state's phase.
+   */
+  LockScreenBasicState.prototype.phase =
+  function() {
+    return this.stream.phase();
+  };
+
+  /**
+   * Derived states should extend these basic methods.
+   */
+  LockScreenBasicState.prototype.start =
+  function() {
+    this.stream = new Stream(this.configs.stream);
+    return this.stream.start(this.handleSourceEvent.bind(this))
+      .next(this.stream.ready.bind(this.stream));
+  };
+
+  LockScreenBasicState.prototype.stop = function() {
+    return this.stream.stop();
+  };
+
+  LockScreenBasicState.prototype.destroy = function() {
+    return this.stream.destroy();
+  };
+
+  LockScreenBasicState.prototype.live = function() {
+    return this.stream.until('stop');
+  };
+
+  LockScreenBasicState.prototype.exist = function() {
+    return this.stream.until('destroy');
+  };
+
+  /**
+   * Must transfer to next state via component's method.
+   * Or the component cannot track the last active state.
+   */
+  LockScreenBasicState.prototype.transferTo = function() {
+    return this.component.transferTo.apply(this.component, arguments);
+  };
+
+  /**
+   * If this handler return a Promise, or Process, the underlying Stream
+   * can make sure the steps are queued even with asynchronous steps.
+   */
+  LockScreenBasicState.prototype.handleSourceEvent = function() {};
+
+  exports.LockScreenBasicState = LockScreenBasicState;
+})(window);
+