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      1 /*
      2  * Copyright 2017, The Android Open Source Project
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  *     http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License.
     15  */
     16 
     17 #ifndef ENTITY_H
     18 #define ENTITY_H
     19 
     20 #include <memory>
     21 #include <vector>
     22 
     23 #include "word_stream.h"
     24 
     25 namespace android {
     26 namespace spirit {
     27 
     28 class Builder;
     29 class IVisitor;
     30 
     31 class Entity {
     32 public:
     33   Entity() {}
     34   Entity(Builder *b) : mBuilder(b) {}
     35 
     36   virtual ~Entity() {}
     37 
     38   virtual void accept(IVisitor *visitor) = 0;
     39   virtual bool DeserializeInternal(InputWordStream &IS) = 0;
     40   virtual void Serialize(OutputWordStream &OS) const;
     41   virtual void dump() const {}
     42 
     43   void setBuilder(Builder *builder) { mBuilder = builder; }
     44 
     45 protected:
     46   Builder *mBuilder;
     47 };
     48 
     49 template <typename T> T *Deserialize(InputWordStream &IS) {
     50   std::unique_ptr<T> entity(new T());
     51   if (!entity->DeserializeInternal(IS)) {
     52     return nullptr;
     53   }
     54   return entity.release();
     55 }
     56 
     57 template <typename T> T *Deserialize(const std::vector<uint32_t> &words) {
     58   std::unique_ptr<InputWordStream> IS(InputWordStream::Create(words));
     59   return Deserialize<T>(*IS);
     60 }
     61 
     62 template <class T>
     63 void DeserializeZeroOrMore(InputWordStream &IS, std::vector<T *> &all) {
     64   while (auto entity = Deserialize<T>(IS)) {
     65     all.push_back(entity);
     66   }
     67 }
     68 
     69 template <class T>
     70 std::vector<uint32_t> Serialize(T* e) {
     71   std::unique_ptr<OutputWordStream> OS(OutputWordStream::Create());
     72   e->Serialize(*OS);
     73   return OS->getWords();
     74 }
     75 
     76 } // namespace spirit
     77 } // namespace android
     78 
     79 #endif // ENTITY_H
     80