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 #include "jni.h"
21 #include <stdint.h>
22 
23 class FrameSequence;
24 class Decoder;
25 class Stream;
26 
27 struct RegistryEntry {
28     int requiredHeaderBytes;
29     bool (*checkHeader)(void* header, int header_size);
30     FrameSequence* (*createFrameSequence)(Stream* stream);
31     Decoder* (*createDecoder)(Stream* stream);
32     bool (*acceptsBuffer)();
33 };
34 
35 /**
36  * Template class for registering subclasses that can produce instances of themselves given a
37  * DataStream pointer.
38  *
39  * The super class / root constructable type only needs to define a single static construction
40  * meathod that creates an instance by iterating through all factory methods.
41  */
42 class Registry {
43 public:
44     Registry(const RegistryEntry& entry);
45 
46     static const RegistryEntry* Find(Stream* stream);
47 
48 private:
49     RegistryEntry mImpl;
50     Registry* mNext;
51 };
52 
53 #endif // RASTERMILL_REGISTRY_H
54