AMessage.h revision 72961230a5890071bcca436eb5630172ce84ec41 
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;
29
30struct AMessage : public RefBase {
31    AMessage(uint32_t what = 0, ALooper::handler_id target = 0);
32
33    void setWhat(uint32_t what);
34    uint32_t what() const;
35
36    void setTarget(ALooper::handler_id target);
37    ALooper::handler_id target() const;
38
39    void setInt32(const char *name, int32_t value);
40    void setInt64(const char *name, int64_t value);
41    void setSize(const char *name, size_t value);
42    void setFloat(const char *name, float value);
43    void setDouble(const char *name, double value);
44    void setPointer(const char *name, void *value);
45    void setString(const char *name, const char *s, ssize_t len = -1);
46    void setObject(const char *name, const sp<RefBase> &obj);
47    void setMessage(const char *name, const sp<AMessage> &obj);
48
49    bool findInt32(const char *name, int32_t *value) const;
50    bool findInt64(const char *name, int64_t *value) const;
51    bool findSize(const char *name, size_t *value) const;
52    bool findFloat(const char *name, float *value) const;
53    bool findDouble(const char *name, double *value) const;
54    bool findPointer(const char *name, void **value) const;
55    bool findString(const char *name, AString *value) const;
56    bool findObject(const char *name, sp<RefBase> *obj) const;
57    bool findMessage(const char *name, sp<AMessage> *obj) const;
58
59    void post(int64_t delayUs = 0);
60
61    sp<AMessage> dup() const;
62
63protected:
64    virtual ~AMessage();
65
66private:
67    enum Type {
68        kTypeInt32,
69        kTypeInt64,
70        kTypeSize,
71        kTypeFloat,
72        kTypeDouble,
73        kTypePointer,
74        kTypeString,
75        kTypeObject,
76        kTypeMessage,
77    };
78
79    uint32_t mWhat;
80    ALooper::handler_id mTarget;
81
82    struct Item {
83        union {
84            int32_t int32Value;
85            int64_t int64Value;
86            size_t sizeValue;
87            float floatValue;
88            double doubleValue;
89            void *ptrValue;
90            RefBase *refValue;
91            AString *stringValue;
92        } u;
93        const char *mName;
94        Type mType;
95    };
96
97    enum {
98        kMaxNumItems = 16
99    };
100    Item mItems[kMaxNumItems];
101    size_t mNumItems;
102
103    void clear();
104    Item *allocateItem(const char *name);
105    void freeItem(Item *item);
106    const Item *findItem(const char *name, Type type) const;
107
108    DISALLOW_EVIL_CONSTRUCTORS(AMessage);
109};
110
111}  // namespace android
112
113#endif  // A_MESSAGE_H_
114