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 26 namespace android { 27 28 struct AString; 29 struct Parcel; 30 31 struct 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 void setRect( 56 const char *name, 57 int32_t left, int32_t top, int32_t right, int32_t bottom); 58 59 bool findInt32(const char *name, int32_t *value) const; 60 bool findInt64(const char *name, int64_t *value) const; 61 bool findSize(const char *name, size_t *value) const; 62 bool findFloat(const char *name, float *value) const; 63 bool findDouble(const char *name, double *value) const; 64 bool findPointer(const char *name, void **value) const; 65 bool findString(const char *name, AString *value) const; 66 bool findObject(const char *name, sp<RefBase> *obj) const; 67 bool findMessage(const char *name, sp<AMessage> *obj) const; 68 69 bool findRect( 70 const char *name, 71 int32_t *left, int32_t *top, int32_t *right, int32_t *bottom) const; 72 73 void post(int64_t delayUs = 0); 74 75 // Posts the message to its target and waits for a response (or error) 76 // before returning. 77 status_t postAndAwaitResponse(sp<AMessage> *response); 78 79 // If this returns true, the sender of this message is synchronously 80 // awaiting a response, the "replyID" can be used to send the response 81 // via "postReply" below. 82 bool senderAwaitsResponse(uint32_t *replyID) const; 83 84 void postReply(uint32_t replyID); 85 86 // Performs a deep-copy of "this", contained messages are in turn "dup'ed". 87 // Warning: RefBase items, i.e. "objects" are _not_ copied but only have 88 // their refcount incremented. 89 sp<AMessage> dup() const; 90 91 AString debugString(int32_t indent = 0) const; 92 93 protected: 94 virtual ~AMessage(); 95 96 private: 97 enum Type { 98 kTypeInt32, 99 kTypeInt64, 100 kTypeSize, 101 kTypeFloat, 102 kTypeDouble, 103 kTypePointer, 104 kTypeString, 105 kTypeObject, 106 kTypeMessage, 107 kTypeRect, 108 }; 109 110 uint32_t mWhat; 111 ALooper::handler_id mTarget; 112 113 struct Rect { 114 int32_t mLeft, mTop, mRight, mBottom; 115 }; 116 117 struct Item { 118 union { 119 int32_t int32Value; 120 int64_t int64Value; 121 size_t sizeValue; 122 float floatValue; 123 double doubleValue; 124 void *ptrValue; 125 RefBase *refValue; 126 AString *stringValue; 127 Rect rectValue; 128 } u; 129 const char *mName; 130 Type mType; 131 }; 132 133 enum { 134 kMaxNumItems = 16 135 }; 136 Item mItems[kMaxNumItems]; 137 size_t mNumItems; 138 139 Item *allocateItem(const char *name); 140 void freeItem(Item *item); 141 const Item *findItem(const char *name, Type type) const; 142 143 DISALLOW_EVIL_CONSTRUCTORS(AMessage); 144 }; 145 146 } // namespace android 147 148 #endif // A_MESSAGE_H_ 149