TypeWrappers.h revision f6113af2d6f6eebee68d3ac510fe96d38a7a39e9 
1/*
2 * Copyright (C) 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 __TYPE_WRAPPERS_H
18#define __TYPE_WRAPPERS_H
19
20#include <androidfw/ResourceTypes.h>
21#include <utils/ByteOrder.h>
22
23namespace android {
24
25struct TypeVariant {
26    TypeVariant(const ResTable_type* data)
27        : data(data) {}
28
29    class iterator {
30    public:
31        iterator& operator=(const iterator& rhs) {
32            mTypeVariant = rhs.mTypeVariant;
33            mIndex = rhs.mIndex;
34            return *this;
35        }
36
37        bool operator==(const iterator& rhs) const {
38            return mTypeVariant == rhs.mTypeVariant && mIndex == rhs.mIndex;
39        }
40
41        bool operator!=(const iterator& rhs) const {
42            return mTypeVariant != rhs.mTypeVariant || mIndex != rhs.mIndex;
43        }
44
45        iterator operator++(int) {
46            uint32_t prevIndex = mIndex;
47            operator++();
48            return iterator(mTypeVariant, prevIndex);
49        }
50
51        const ResTable_entry* operator->() const {
52            return operator*();
53        }
54
55        uint32_t index() const {
56            return mIndex;
57        }
58
59        iterator& operator++();
60        const ResTable_entry* operator*() const;
61
62    private:
63        friend struct TypeVariant;
64        iterator(const TypeVariant* tv, uint32_t index)
65            : mTypeVariant(tv), mIndex(index) {}
66        const TypeVariant* mTypeVariant;
67        uint32_t mIndex;
68    };
69
70    iterator beginEntries() const {
71        return iterator(this, 0);
72    }
73
74    iterator endEntries() const {
75        return iterator(this, dtohl(data->entryCount));
76    }
77
78    const ResTable_type* data;
79};
80
81} // namespace android
82
83#endif // __TYPE_WRAPPERS_H
84