Match pulled events in gauge metric.

Bug: b/117703265

Test: statsd unit tests
Change-Id: Ia4c67ebfdb4f9647d4135c6879f04faa4efdd471
diff --git a/cmds/statsd/src/matchers/EventMatcherWizard.h b/cmds/statsd/src/matchers/EventMatcherWizard.h
new file mode 100644
index 0000000..57ec2b3
--- /dev/null
+++ b/cmds/statsd/src/matchers/EventMatcherWizard.h
@@ -0,0 +1,41 @@
+/*
+ * Copyright (C) 2018 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#pragma once
+
+#include "LogMatchingTracker.h"
+
+namespace android {
+namespace os {
+namespace statsd {
+
+class EventMatcherWizard : public virtual android::RefBase {
+public:
+    EventMatcherWizard(){};  // for testing
+    EventMatcherWizard(const std::vector<sp<LogMatchingTracker>>& eventTrackers)
+        : mAllEventMatchers(eventTrackers){};
+
+    virtual ~EventMatcherWizard(){};
+
+    MatchingState matchLogEvent(const LogEvent& event, int matcher_index);
+
+private:
+    std::vector<sp<LogMatchingTracker>> mAllEventMatchers;
+};
+
+}  // namespace statsd
+}  // namespace os
+}  // namespace android