1 /*
2  * Copyright 2014 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 IMG_UTILS_ORDERABLE
18 #define IMG_UTILS_ORDERABLE
19 
20 #include <cutils/compiler.h>
21 #include <stdint.h>
22 
23 namespace android {
24 namespace img_utils {
25 
26 #define COMPARE_DEF(op) \
27 inline bool operator op (const Orderable& orderable) const;
28 
29 /**
30  * Subclasses of Orderable can be compared and sorted.  This is
31  * intended to be used to create sorted arrays of TIFF entries
32  * and IFDs.
33  */
34 class ANDROID_API Orderable  {
35     public:
36         virtual ~Orderable();
37 
38         /**
39          * Comparison operatotors are based on the value returned
40          * from this method.
41          */
42         virtual uint32_t getComparableValue() const = 0;
43 
44         COMPARE_DEF(>)
45         COMPARE_DEF(<)
46         COMPARE_DEF(>=)
47         COMPARE_DEF(<=)
48         COMPARE_DEF(==)
49         COMPARE_DEF(!=)
50 };
51 
52 #undef COMPARE_DEF
53 
54 } /*namespace img_utils*/
55 } /*namespace android*/
56 
57 #endif /*IMG_UTILS_ORDERABLE*/
58