Publish Vulpes Preview 15 sources for desktop, Android and Tundra

Share Gaia assets and adapters, keep private profiles and development documents local, and update both public READMEs.

gaia/apps/email/js/ext/headerCounter.js

@@ -0,0 +1,93 @@
+/**
+ * This file implements a function which performs a
+ * a streaming search of a folder to determine the count of
+ * headers which match a particular filter.
+ */
+
+
+define(
+  [
+    'module',
+    'exports'
+  ],
+  function(
+    $module,
+    exports) {
+
+
+exports.countHeaders = function(storage, filter, options, callback) {
+
+  var fetchClobber = null;
+  if (typeof options === "function") {
+    callback = options;
+  } else {
+    fetchClobber = options.fetchSize;
+  }
+  var matched = 0;
+
+  // Relatively arbitrary value, but makes sure we don't use too much
+  // memory while streaming
+  var fetchSize = fetchClobber || 100;
+  var startTS = null;
+  var startUID = null;
+
+  function gotMessages(dir, callback, headers, moreMessagesComing) {
+    // conditionally indent messages that are non-notable callbacks since we
+    // have more messages coming.  sanity measure for asuth for now.
+    var logPrefix = moreMessagesComing ? 'sf: ' : 'sf:';
+    console.log(logPrefix, 'gotMessages', headers.length, 'more coming?',
+                moreMessagesComing);
+    // update the range of what we have seen and searched
+    if (headers.length) {
+        var lastHeader = headers[headers.length - 1];
+        startTS = lastHeader.date;
+        startUID = lastHeader.id;
+    }
+
+    var checkHandle = function checkHandle(headers) {
+      // Update the matched count
+      for (var i = 0; i < headers.length; i++) {
+        var header = headers[i];
+        var isMatch = filter(header);
+        if (isMatch) {
+          matched++;
+        }
+      }
+
+      var atBottom = storage.headerIsOldestKnown(
+                        startTS, startUID);
+      var canGetMore = !atBottom,
+          wantMore = !moreMessagesComing && canGetMore;
+
+      if (wantMore) {
+        console.log(logPrefix, 'requesting more because want more');
+        getNewMessages(dir, false, true, callback);
+      } else if (!moreMessagesComing) {
+        callback(matched);
+      }
+
+      // (otherwise we need to wait for the additional messages to show before
+      //  doing anything conclusive)
+    };
+
+    checkHandle(headers);
+  }
+
+
+  function getNewMessages (dirMagnitude, userRequestsGrowth, autoDoNotDesireMore,
+    callback) {
+
+    storage.flushExcessCachedBlocks('countHeaders');
+
+    storage.getMessagesBeforeMessage(startTS, startUID,
+        fetchSize, gotMessages.bind(null, 1, callback));
+
+  }
+
+  storage.getMessagesInImapDateRange(
+    0, null, fetchSize, fetchSize,
+    gotMessages.bind(null, 1, callback));
+
+};
+
+}); // end define