AMessage.h revision f933441648ef6a71dee783d733aac17b9508b452 
1/*
2 * Copyright (C) 2010 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 A_MESSAGE_H_
18
19#define A_MESSAGE_H_
20
21#include <media/stagefright/foundation/ABase.h>
22#include <media/stagefright/foundation/ALooper.h>
23#include <utils/KeyedVector.h>
24#include <utils/RefBase.h>
25
26namespace android {
27
28struct AString;
29struct Parcel;
30
31struct AMessage : public RefBase {
32    AMessage(uint32_t what = 0, ALooper::handler_id target = 0);
33
34    static sp<AMessage> FromParcel(const Parcel &parcel);
35    void writeToParcel(Parcel *parcel) const;
36
37    void setWhat(uint32_t what);
38    uint32_t what() const;
39
40    void setTarget(ALooper::handler_id target);
41    ALooper::handler_id target() const;
42
43    void clear();
44
45    void setInt32(const char *name, int32_t value);
46    void setInt64(const char *name, int64_t value);
47    void setSize(const char *name, size_t value);
48    void setFloat(const char *name, float value);
49    void setDouble(const char *name, double value);
50    void setPointer(const char *name, void *value);
51    void setString(const char *name, const char *s, ssize_t len = -1);
52    void setObject(const char *name, const sp<RefBase> &obj);
53    void setMessage(const char *name, const sp<AMessage> &obj);
54
55    bool findInt32(const char *name, int32_t *value) const;
56    bool findInt64(const char *name, int64_t *value) const;
57    bool findSize(const char *name, size_t *value) const;
58    bool findFloat(const char *name, float *value) const;
59    bool findDouble(const char *name, double *value) const;
60    bool findPointer(const char *name, void **value) const;
61    bool findString(const char *name, AString *value) const;
62    bool findObject(const char *name, sp<RefBase> *obj) const;
63    bool findMessage(const char *name, sp<AMessage> *obj) const;
64
65    void post(int64_t delayUs = 0);
66
67    sp<AMessage> dup() const;
68
69    AString debugString(int32_t indent = 0) const;
70
71protected:
72    virtual ~AMessage();
73
74private:
75    enum Type {
76        kTypeInt32,
77        kTypeInt64,
78        kTypeSize,
79        kTypeFloat,
80        kTypeDouble,
81        kTypePointer,
82        kTypeString,
83        kTypeObject,
84        kTypeMessage,
85    };
86
87    uint32_t mWhat;
88    ALooper::handler_id mTarget;
89
90    struct Item {
91        union {
92            int32_t int32Value;
93            int64_t int64Value;
94            size_t sizeValue;
95            float floatValue;
96            double doubleValue;
97            void *ptrValue;
98            RefBase *refValue;
99            AString *stringValue;
100        } u;
101        const char *mName;
102        Type mType;
103    };
104
105    enum {
106        kMaxNumItems = 16
107    };
108    Item mItems[kMaxNumItems];
109    size_t mNumItems;
110
111    Item *allocateItem(const char *name);
112    void freeItem(Item *item);
113    const Item *findItem(const char *name, Type type) const;
114
115    DISALLOW_EVIL_CONSTRUCTORS(AMessage);
116};
117
118}  // namespace android
119
120#endif  // A_MESSAGE_H_
121