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/*
* Copyright (C) 2010 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#ifndef A_MESSAGE_H_
#define A_MESSAGE_H_
#include <media/stagefright/foundation/ABase.h>
#include <media/stagefright/foundation/ALooper.h>
#include <utils/KeyedVector.h>
#include <utils/RefBase.h>
namespace android {
struct ABuffer;
struct AString;
struct Parcel;
struct AMessage : public RefBase {
AMessage(uint32_t what = 0, ALooper::handler_id target = 0);
static sp<AMessage> FromParcel(const Parcel &parcel);
void writeToParcel(Parcel *parcel) const;
void setWhat(uint32_t what);
uint32_t what() const;
void setTarget(ALooper::handler_id target);
ALooper::handler_id target() const;
void clear();
void setInt32(const char *name, int32_t value);
void setInt64(const char *name, int64_t value);
void setSize(const char *name, size_t value);
void setFloat(const char *name, float value);
void setDouble(const char *name, double value);
void setPointer(const char *name, void *value);
void setString(const char *name, const char *s, ssize_t len = -1);
void setString(const char *name, const AString &s);
void setObject(const char *name, const sp<RefBase> &obj);
void setBuffer(const char *name, const sp<ABuffer> &buffer);
void setMessage(const char *name, const sp<AMessage> &obj);
void setRect(
const char *name,
int32_t left, int32_t top, int32_t right, int32_t bottom);
bool contains(const char *name) const;
bool findInt32(const char *name, int32_t *value) const;
bool findInt64(const char *name, int64_t *value) const;
bool findSize(const char *name, size_t *value) const;
bool findFloat(const char *name, float *value) const;
bool findDouble(const char *name, double *value) const;
bool findPointer(const char *name, void **value) const;
bool findString(const char *name, AString *value) const;
bool findObject(const char *name, sp<RefBase> *obj) const;
bool findBuffer(const char *name, sp<ABuffer> *buffer) const;
bool findMessage(const char *name, sp<AMessage> *obj) const;
bool findRect(
const char *name,
int32_t *left, int32_t *top, int32_t *right, int32_t *bottom) const;
void post(int64_t delayUs = 0);
// Posts the message to its target and waits for a response (or error)
// before returning.
status_t postAndAwaitResponse(sp<AMessage> *response);
// If this returns true, the sender of this message is synchronously
// awaiting a response, the "replyID" can be used to send the response
// via "postReply" below.
bool senderAwaitsResponse(uint32_t *replyID) const;
void postReply(uint32_t replyID);
// Performs a deep-copy of "this", contained messages are in turn "dup'ed".
// Warning: RefBase items, i.e. "objects" are _not_ copied but only have
// their refcount incremented.
sp<AMessage> dup() const;
AString debugString(int32_t indent = 0) const;
enum Type {
kTypeInt32,
kTypeInt64,
kTypeSize,
kTypeFloat,
kTypeDouble,
kTypePointer,
kTypeString,
kTypeObject,
kTypeMessage,
kTypeRect,
kTypeBuffer,
};
size_t countEntries() const;
const char *getEntryNameAt(size_t index, Type *type) const;
protected:
virtual ~AMessage();
private:
uint32_t mWhat;
ALooper::handler_id mTarget;
struct Rect {
int32_t mLeft, mTop, mRight, mBottom;
};
struct Item {
union {
int32_t int32Value;
int64_t int64Value;
size_t sizeValue;
float floatValue;
double doubleValue;
void *ptrValue;
RefBase *refValue;
AString *stringValue;
Rect rectValue;
} u;
const char *mName;
size_t mNameLength;
Type mType;
void setName(const char *name, size_t len);
};
enum {
kMaxNumItems = 64
};
Item mItems[kMaxNumItems];
size_t mNumItems;
Item *allocateItem(const char *name);
void freeItemValue(Item *item);
const Item *findItem(const char *name, Type type) const;
void setObjectInternal(
const char *name, const sp<RefBase> &obj, Type type);
size_t findItemIndex(const char *name, size_t len) const;
DISALLOW_EVIL_CONSTRUCTORS(AMessage);
};
} // namespace android
#endif // A_MESSAGE_H_
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