1 files changed, 39 insertions, 0 deletions
diff --git a/java/com/android/incallui/answer/impl/classifier/LengthCountClassifier.java b/java/com/android/incallui/answer/impl/classifier/LengthCountClassifier.java
new file mode 100644
index 000000000..7dd2ab674
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+++ b/java/com/android/incallui/answer/impl/classifier/LengthCountClassifier.java
@@ -0,0 +1,39 @@
+/*
+ * Copyright (C) 2015 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
+ */
+
+package com.android.incallui.answer.impl.classifier;
+
+/**
+ * A classifier which looks at the ratio between the length of the stroke and its number of points.
+ * The number of points is subtracted by 2 because the UP event comes in with some delay and it
+ * should not influence the ratio and also strokes which are long and have a small number of points
+ * are punished more (these kind of strokes are usually bad ones and they tend to score well in
+ * other classifiers).
+ */
+class LengthCountClassifier extends StrokeClassifier {
+  public LengthCountClassifier(ClassifierData classifierData) {}
+
+  @Override
+  public String getTag() {
+    return "LEN_CNT";
+  }
+
+  @Override
+  public float getFalseTouchEvaluation(Stroke stroke) {
+    return LengthCountEvaluator.evaluate(
+        stroke.getTotalLength() / Math.max(1.0f, stroke.getCount() - 2));
+  }
+}