Add spellcheck and word suggestion to the prediction service

third_party/prediction/suggest/policyimpl/utils/edit_distance_policy.h

+/*
+ * Copyright (C) 2013 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.
+ */
+
+#ifndef LATINIME_EDIT_DISTANCE_POLICY_H
+#define LATINIME_EDIT_DISTANCE_POLICY_H
+
+#include "third_party/prediction/defines.h"
+
+namespace latinime {
+
+class EditDistancePolicy {
+ public:
+  virtual float getSubstitutionCost(const int index0,
+                                    const int index1) const = 0;
+  virtual float getDeletionCost(const int index0, const int index1) const = 0;
+  virtual float getInsertionCost(const int index0, const int index1) const = 0;
+  virtual bool allowTransposition(const int index0, const int index1) const = 0;
+  virtual float getTranspositionCost(const int index0,
+                                     const int index1) const = 0;
+  virtual int getString0Length() const = 0;
+  virtual int getString1Length() const = 0;
+
+ protected:
+  EditDistancePolicy() {}
+  virtual ~EditDistancePolicy() {}
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(EditDistancePolicy);
+};
+}  // namespace latinime
+
+#endif  // LATINIME_EDIT_DISTANCE_POLICY_H