1 /*
2  * Copyright (C) 2013 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 RASTERMILL_REGISTRY_H
18 #define RASTERMILL_REGISTRY_H
19 
20 class FrameSequence;
21 class Decoder;
22 class Stream;
23 
24 struct RegistryEntry {
25     int requiredHeaderBytes;
26     bool (*checkHeader)(void* header, int header_size);
27     FrameSequence* (*createFrameSequence)(Stream* stream);
28     Decoder* (*createDecoder)(Stream* stream);
29 };
30 
31 /**
32  * Template class for registering subclasses that can produce instances of themselves given a
33  * DataStream pointer.
34  *
35  * The super class / root constructable type only needs to define a single static construction
36  * meathod that creates an instance by iterating through all factory methods.
37  */
38 class Registry {
39 public:
40     Registry(const RegistryEntry& entry);
41 
42     static const RegistryEntry* Find(Stream* stream);
43 
44 private:
45     RegistryEntry mImpl;
46     Registry* mNext;
47 };
48 
49 #endif // RASTERMILL_REGISTRY_H
50