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/* $Id$ */
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/*
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* Copyright (C) 2013 Teluu Inc. (http://www.teluu.com)
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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||||
* This program is distributed in the hope that it will be useful,
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||||
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||||
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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||||
* GNU General Public License for more details.
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||||
*
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||||
* You should have received a copy of the GNU General Public License
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||||
* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#ifndef __PJSUA2_PERSISTENT_HPP__
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#define __PJSUA2_PERSISTENT_HPP__
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/**
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* @file pjsua2/persistent.hpp
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* @brief PJSUA2 Persistent Services
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*/
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#include <pjsua2/types.hpp>
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#include <string>
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#include <vector>
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/** PJSUA2 API is inside pj namespace */
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namespace pj
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{
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/**
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* @defgroup PJSUA2_PERSISTENT Persistent API
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* @ingroup PJSUA2_Ref
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* @{
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* The persistent API provides functionality to read/write data from/to
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* a document (string or file). The data can be simple data types such
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* as boolean, number, string, and string arrays, or a user defined object.
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* Currently the implementation supports reading and writing from/to JSON
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* document, but the framework allows application to extend the API to
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* support other document formats.
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*/
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using std::string;
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using std::vector;
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/* Forward declaration for ContainerNode */
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class ContainerNode;
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/**
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* This is the abstract base class of objects that can be serialized to/from
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* persistent document.
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*/
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class PersistentObject
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{
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public:
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/**
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* Virtual destructor
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*/
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virtual ~PersistentObject()
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{}
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/**
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* Read this object from a container node.
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*
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* @param node Container to read values from.
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*/
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virtual void readObject(const ContainerNode &node) PJSUA2_THROW(Error) = 0;
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/**
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* Write this object to a container node.
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*
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* @param node Container to write values to.
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*/
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virtual void writeObject(ContainerNode &node) const PJSUA2_THROW(Error) = 0;
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};
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/**
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* This a the abstract base class for a persistent document. A document
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* is created either by loading from a string or a file, or by constructing
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* it manually when writing data to it. The document then can be saved
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* to either string or to a file. A document contains one root ContainerNode
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* where all data are stored under.
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*
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* Document is read and written serially, hence the order of reading must be
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* the same as the order of writing. The PersistentDocument class provides
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* API to read and write to the root node, but for more flexible operations
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* application can use the ContainerNode methods instead. Indeed the read
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* and write API in PersistentDocument is just a shorthand which calls the
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* relevant methods in the ContainerNode. As a tip, normally application only
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* uses the readObject() and writeObject() methods declared here to read/write
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* top level objects, and use the macros that are explained in ContainerNode
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* documentation to read/write more detailed data.
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*/
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class PersistentDocument
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{
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public:
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/**
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* Virtual destructor
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*/
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virtual ~PersistentDocument()
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{}
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/**
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* Load this document from a file.
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*
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* @param filename The file name.
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*/
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virtual void loadFile(const string &filename)
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PJSUA2_THROW(Error) = 0;
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/**
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* Load this document from string.
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*
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* @param input The string.
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*/
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virtual void loadString(const string &input)
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PJSUA2_THROW(Error) = 0;
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/**
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* Write this document to a file.
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*
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* @param filename The file name.
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*/
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virtual void saveFile(const string &filename)
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PJSUA2_THROW(Error) = 0;
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/**
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* Write this document to string.
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*
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* @return The string document.
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*/
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virtual string saveString() PJSUA2_THROW(Error) = 0;
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/**
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* Get the root container node for this document
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*
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* @return The root node.
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*/
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virtual ContainerNode & getRootContainer() const = 0;
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||||
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/*
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* Shorthand functions for reading and writing from/to the root container
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||||
*/
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||||
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||||
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/**
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* Determine if there is unread element. If yes, then app can use one of
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* the readXxx() functions to read it.
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*
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* @return True if there is.
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*/
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bool hasUnread() const;
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/**
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* Get the name of the next unread element. It will throw Error if there
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* is no more element to read.
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*
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* @return The name of the next element .
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*/
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string unreadName() const PJSUA2_THROW(Error);
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|
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/**
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* Read an integer value from the document and return the value.
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* This will throw Error if the current element is not a number.
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* The read position will be advanced to the next element.
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*
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* @param name If specified, then the function will check if the
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* name of the next element matches the specified
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* name and throw Error if it doesn't match.
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||||
*
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||||
* @return The value.
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||||
*/
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int readInt(const string &name="") const
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PJSUA2_THROW(Error);
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/**
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* Read a float value from the document and return the value.
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* This will throw Error if the current element is not a number.
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||||
* The read position will be advanced to the next element.
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*
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||||
* @param name If specified, then the function will check if the
|
||||
* name of the next element matches the specified
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* name and throw Error if it doesn't match.
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||||
*
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* @return The value.
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||||
*/
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||||
float readNumber(const string &name="") const
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||||
PJSUA2_THROW(Error);
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||||
|
||||
/**
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* Read a boolean value from the container and return the value.
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||||
* This will throw Error if the current element is not a boolean.
|
||||
* The read position will be advanced to the next element.
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||||
*
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||||
* @param name If specified, then the function will check if the
|
||||
* name of the next element matches the specified
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||||
* name and throw Error if it doesn't match.
|
||||
*
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||||
* @return The value.
|
||||
*/
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||||
bool readBool(const string &name="") const
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||||
PJSUA2_THROW(Error);
|
||||
|
||||
/**
|
||||
* Read a string value from the container and return the value.
|
||||
* This will throw Error if the current element is not a string.
|
||||
* The read position will be advanced to the next element.
|
||||
*
|
||||
* @param name If specified, then the function will check if the
|
||||
* name of the next element matches the specified
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||||
* name and throw Error if it doesn't match.
|
||||
*
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||||
* @return The value.
|
||||
*/
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||||
string readString(const string &name="") const
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||||
PJSUA2_THROW(Error);
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||||
|
||||
/**
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||||
* Read a string array from the container. This will throw Error
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||||
* if the current element is not a string array. The read position
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||||
* will be advanced to the next element.
|
||||
*
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||||
* @param name If specified, then the function will check if the
|
||||
* name of the next element matches the specified
|
||||
* name and throw Error if it doesn't match.
|
||||
*
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||||
* @return The value.
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||||
*/
|
||||
StringVector readStringVector(const string &name="") const
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||||
PJSUA2_THROW(Error);
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||||
|
||||
/**
|
||||
* Read the specified object from the container. This is equal to
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||||
* calling PersistentObject.readObject(ContainerNode);
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||||
*
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||||
* @param obj The object to read.
|
||||
*/
|
||||
void readObject(PersistentObject &obj) const
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PJSUA2_THROW(Error);
|
||||
|
||||
/**
|
||||
* Read a container from the container. This will throw Error if the
|
||||
* current element is not an object. The read position will be advanced
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||||
* to the next element.
|
||||
*
|
||||
* @param name If specified, then the function will check if the
|
||||
* name of the next element matches the specified
|
||||
* name and throw Error if it doesn't match.
|
||||
*
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||||
* @return Container object.
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||||
*/
|
||||
ContainerNode readContainer(const string &name="") const
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PJSUA2_THROW(Error);
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||||
/**
|
||||
* Read array container from the container. This will throw Error if the
|
||||
* current element is not an array. The read position will be advanced
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||||
* to the next element.
|
||||
*
|
||||
* @param name If specified, then the function will check if the
|
||||
* name of the next element matches the specified
|
||||
* name and throw Error if it doesn't match.
|
||||
*
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||||
* @return Container object.
|
||||
*/
|
||||
ContainerNode readArray(const string &name="") const
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||||
PJSUA2_THROW(Error);
|
||||
|
||||
/**
|
||||
* Write a number value to the container.
|
||||
*
|
||||
* @param name The name for the value in the container.
|
||||
* @param num The value to be written.
|
||||
*/
|
||||
void writeNumber(const string &name,
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||||
float num) PJSUA2_THROW(Error);
|
||||
|
||||
/**
|
||||
* Write a number value to the container.
|
||||
*
|
||||
* @param name The name for the value in the container.
|
||||
* @param num The value to be written.
|
||||
*/
|
||||
void writeInt(const string &name,
|
||||
int num) PJSUA2_THROW(Error);
|
||||
|
||||
/**
|
||||
* Write a boolean value to the container.
|
||||
*
|
||||
* @param name The name for the value in the container.
|
||||
* @param value The value to be written.
|
||||
*/
|
||||
void writeBool(const string &name,
|
||||
bool value) PJSUA2_THROW(Error);
|
||||
|
||||
/**
|
||||
* Write a string value to the container.
|
||||
*
|
||||
* @param name The name for the value in the container.
|
||||
* @param value The value to be written.
|
||||
*/
|
||||
void writeString(const string &name,
|
||||
const string &value) PJSUA2_THROW(Error);
|
||||
|
||||
/**
|
||||
* Write string vector to the container.
|
||||
*
|
||||
* @param name The name for the value in the container.
|
||||
* @param arr The vector to be written.
|
||||
*/
|
||||
void writeStringVector(const string &name,
|
||||
const StringVector &arr)
|
||||
PJSUA2_THROW(Error);
|
||||
|
||||
/**
|
||||
* Write an object to the container. This is equal to calling
|
||||
* PersistentObject.writeObject(ContainerNode);
|
||||
*
|
||||
* @param obj The object to be written
|
||||
*/
|
||||
void writeObject(const PersistentObject &obj)
|
||||
PJSUA2_THROW(Error);
|
||||
|
||||
/**
|
||||
* Create and write an empty Object node that can be used as parent
|
||||
* for subsequent write operations.
|
||||
*
|
||||
* @param name The name for the new container in the container.
|
||||
*
|
||||
* @return A sub-container.
|
||||
*/
|
||||
ContainerNode writeNewContainer(const string &name)
|
||||
PJSUA2_THROW(Error);
|
||||
|
||||
/**
|
||||
* Create and write an empty array node that can be used as parent
|
||||
* for subsequent write operations.
|
||||
*
|
||||
* @param name The name for the array.
|
||||
*
|
||||
* @return A sub-container.
|
||||
*/
|
||||
ContainerNode writeNewArray(const string &name)
|
||||
PJSUA2_THROW(Error);
|
||||
};
|
||||
|
||||
|
||||
/**
|
||||
* Forward declaration of container_node_op.
|
||||
*/
|
||||
struct container_node_op;
|
||||
|
||||
|
||||
/**
|
||||
* Internal data for ContainerNode. See ContainerNode implementation notes
|
||||
* for more info.
|
||||
*/
|
||||
struct container_node_internal_data
|
||||
{
|
||||
void *doc; /**< The document. */
|
||||
void *data1; /**< Internal data 1 */
|
||||
void *data2; /**< Internal data 2 */
|
||||
};
|
||||
|
||||
/**
|
||||
* A container node is a placeholder for storing other data elements, which
|
||||
* could be boolean, number, string, array of strings, or another container.
|
||||
* Each data in the container is basically a name/value pair, with a type
|
||||
* internally associated with it so that written data can be read in the
|
||||
* correct type. Data is read and written serially, hence the order of
|
||||
* reading must be the same as the order of writing.
|
||||
*
|
||||
* Application can read data from it by using the various read methods, and
|
||||
* write data to it using the various write methods. Alternatively, it
|
||||
* may be more convenient to use the provided macros below to read and write
|
||||
* the data, because these macros set the name automatically:
|
||||
* - NODE_READ_BOOL(node,item)
|
||||
* - NODE_READ_UNSIGNED(node,item)
|
||||
* - NODE_READ_INT(node,item)
|
||||
* - NODE_READ_FLOAT(node,item)
|
||||
* - NODE_READ_NUM_T(node,type,item)
|
||||
* - NODE_READ_STRING(node,item)
|
||||
* - NODE_READ_STRINGV(node,item)
|
||||
* - NODE_READ_OBJ(node,item)
|
||||
* - NODE_WRITE_BOOL(node,item)
|
||||
* - NODE_WRITE_UNSIGNED(node,item)
|
||||
* - NODE_WRITE_INT(node,item)
|
||||
* - NODE_WRITE_FLOAT(node,item)
|
||||
* - NODE_WRITE_NUM_T(node,type,item)
|
||||
* - NODE_WRITE_STRING(node,item)
|
||||
* - NODE_WRITE_STRINGV(node,item)
|
||||
* - NODE_WRITE_OBJ(node,item)
|
||||
*
|
||||
* Implementation notes:
|
||||
*
|
||||
* The ContainerNode class is subclass-able, but not in the usual C++ way.
|
||||
* With the usual C++ inheritance, some methods will be made pure virtual
|
||||
* and must be implemented by the actual class. However, doing so will
|
||||
* require dynamic instantiation of the ContainerNode class, which means
|
||||
* we will need to pass around the class as pointer, for example as the
|
||||
* return value of readContainer() and writeNewContainer() methods. Then
|
||||
* we will need to establish who needs or how to delete these objects, or
|
||||
* use shared pointer mechanism, each of which is considered too inconvenient
|
||||
* or complicated for the purpose.
|
||||
*
|
||||
* So hence we use C style "inheritance", where the methods are declared in
|
||||
* container_node_op and the data in container_node_internal_data structures.
|
||||
* An implementation of ContainerNode class will need to set up these members
|
||||
* with values that makes sense to itself. The methods in container_node_op
|
||||
* contains the pointer to the actual implementation of the operation, which
|
||||
* would be specific according to the format of the document. The methods in
|
||||
* this ContainerNode class are just thin wrappers which call the
|
||||
* implementation in the container_node_op structure.
|
||||
*
|
||||
*/
|
||||
class ContainerNode
|
||||
{
|
||||
public:
|
||||
/**
|
||||
* Determine if there is unread element. If yes, then app can use one of
|
||||
* the readXxx() functions to read it.
|
||||
*/
|
||||
bool hasUnread() const;
|
||||
|
||||
/**
|
||||
* Get the name of the next unread element.
|
||||
*/
|
||||
string unreadName() const PJSUA2_THROW(Error);
|
||||
|
||||
/**
|
||||
* Read an integer value from the document and return the value.
|
||||
* This will throw Error if the current element is not a number.
|
||||
* The read position will be advanced to the next element.
|
||||
*
|
||||
* @param name If specified, then the function will check if the
|
||||
* name of the next element matches the specified
|
||||
* name and throw Error if it doesn't match.
|
||||
*
|
||||
* @return The value.
|
||||
*/
|
||||
int readInt(const string &name="") const
|
||||
PJSUA2_THROW(Error);
|
||||
|
||||
/**
|
||||
* Read a number value from the document and return the value.
|
||||
* This will throw Error if the current element is not a number.
|
||||
* The read position will be advanced to the next element.
|
||||
*
|
||||
* @param name If specified, then the function will check if the
|
||||
* name of the next element matches the specified
|
||||
* name and throw Error if it doesn't match.
|
||||
*
|
||||
* @return The value.
|
||||
*/
|
||||
float readNumber(const string &name="") const
|
||||
PJSUA2_THROW(Error);
|
||||
|
||||
/**
|
||||
* Read a boolean value from the container and return the value.
|
||||
* This will throw Error if the current element is not a boolean.
|
||||
* The read position will be advanced to the next element.
|
||||
*
|
||||
* @param name If specified, then the function will check if the
|
||||
* name of the next element matches the specified
|
||||
* name and throw Error if it doesn't match.
|
||||
*
|
||||
* @return The value.
|
||||
*/
|
||||
bool readBool(const string &name="") const
|
||||
PJSUA2_THROW(Error);
|
||||
|
||||
/**
|
||||
* Read a string value from the container and return the value.
|
||||
* This will throw Error if the current element is not a string.
|
||||
* The read position will be advanced to the next element.
|
||||
*
|
||||
* @param name If specified, then the function will check if the
|
||||
* name of the next element matches the specified
|
||||
* name and throw Error if it doesn't match.
|
||||
*
|
||||
* @return The value.
|
||||
*/
|
||||
string readString(const string &name="") const
|
||||
PJSUA2_THROW(Error);
|
||||
|
||||
/**
|
||||
* Read a string array from the container. This will throw Error
|
||||
* if the current element is not a string array. The read position
|
||||
* will be advanced to the next element.
|
||||
*
|
||||
* @param name If specified, then the function will check if the
|
||||
* name of the next element matches the specified
|
||||
* name and throw Error if it doesn't match.
|
||||
*
|
||||
* @return The value.
|
||||
*/
|
||||
StringVector readStringVector(const string &name="") const
|
||||
PJSUA2_THROW(Error);
|
||||
|
||||
/**
|
||||
* Read the specified object from the container. This is equal to
|
||||
* calling PersistentObject.readObject(ContainerNode);
|
||||
*
|
||||
* @param obj The object to read.
|
||||
*/
|
||||
void readObject(PersistentObject &obj) const
|
||||
PJSUA2_THROW(Error);
|
||||
|
||||
/**
|
||||
* Read a container from the container. This will throw Error if the
|
||||
* current element is not a container. The read position will be advanced
|
||||
* to the next element.
|
||||
*
|
||||
* @param name If specified, then the function will check if the
|
||||
* name of the next element matches the specified
|
||||
* name and throw Error if it doesn't match.
|
||||
*
|
||||
* @return Container object.
|
||||
*/
|
||||
ContainerNode readContainer(const string &name="") const
|
||||
PJSUA2_THROW(Error);
|
||||
|
||||
/**
|
||||
* Read array container from the container. This will throw Error if the
|
||||
* current element is not an array. The read position will be advanced
|
||||
* to the next element.
|
||||
*
|
||||
* @param name If specified, then the function will check if the
|
||||
* name of the next element matches the specified
|
||||
* name and throw Error if it doesn't match.
|
||||
*
|
||||
* @return Container object.
|
||||
*/
|
||||
ContainerNode readArray(const string &name="") const
|
||||
PJSUA2_THROW(Error);
|
||||
|
||||
/**
|
||||
* Write a number value to the container.
|
||||
*
|
||||
* @param name The name for the value in the container.
|
||||
* @param num The value to be written.
|
||||
*/
|
||||
void writeNumber(const string &name,
|
||||
float num) PJSUA2_THROW(Error);
|
||||
|
||||
/**
|
||||
* Write a number value to the container.
|
||||
*
|
||||
* @param name The name for the value in the container.
|
||||
* @param num The value to be written.
|
||||
*/
|
||||
void writeInt(const string &name,
|
||||
int num) PJSUA2_THROW(Error);
|
||||
|
||||
/**
|
||||
* Write a boolean value to the container.
|
||||
*
|
||||
* @param name The name for the value in the container.
|
||||
* @param value The value to be written.
|
||||
*/
|
||||
void writeBool(const string &name,
|
||||
bool value) PJSUA2_THROW(Error);
|
||||
|
||||
/**
|
||||
* Write a string value to the container.
|
||||
*
|
||||
* @param name The name for the value in the container.
|
||||
* @param value The value to be written.
|
||||
*/
|
||||
void writeString(const string &name,
|
||||
const string &value) PJSUA2_THROW(Error);
|
||||
|
||||
/**
|
||||
* Write string vector to the container.
|
||||
*
|
||||
* @param name The name for the value in the container.
|
||||
* @param arr The vector to be written.
|
||||
*/
|
||||
void writeStringVector(const string &name,
|
||||
const StringVector &arr)
|
||||
PJSUA2_THROW(Error);
|
||||
|
||||
/**
|
||||
* Write an object to the container. This is equal to calling
|
||||
* PersistentObject.writeObject(ContainerNode);
|
||||
*
|
||||
* @param obj The object to be written
|
||||
*/
|
||||
void writeObject(const PersistentObject &obj)
|
||||
PJSUA2_THROW(Error);
|
||||
|
||||
/**
|
||||
* Create and write an empty Object node that can be used as parent
|
||||
* for subsequent write operations.
|
||||
*
|
||||
* @param name The name for the new container in the container.
|
||||
*
|
||||
* @return A sub-container.
|
||||
*/
|
||||
ContainerNode writeNewContainer(const string &name)
|
||||
PJSUA2_THROW(Error);
|
||||
|
||||
/**
|
||||
* Create and write an empty array node that can be used as parent
|
||||
* for subsequent write operations.
|
||||
*
|
||||
* @param name The name for the array.
|
||||
*
|
||||
* @return A sub-container.
|
||||
*/
|
||||
ContainerNode writeNewArray(const string &name)
|
||||
PJSUA2_THROW(Error);
|
||||
|
||||
public:
|
||||
/* internal data */
|
||||
container_node_op *op; /**< Method table. */
|
||||
container_node_internal_data data; /**< Internal data */
|
||||
};
|
||||
|
||||
|
||||
/**
|
||||
* Pointer to actual ContainerNode implementation. See ContainerNode
|
||||
* implementation notes for more info.
|
||||
*/
|
||||
//! @cond Doxygen_Suppress
|
||||
struct container_node_op
|
||||
{
|
||||
bool (*hasUnread)(const ContainerNode*);
|
||||
string (*unreadName)(const ContainerNode*)
|
||||
PJSUA2_THROW(Error);
|
||||
float (*readNumber)(const ContainerNode*,
|
||||
const string&)
|
||||
PJSUA2_THROW(Error);
|
||||
bool (*readBool)(const ContainerNode*,
|
||||
const string&)
|
||||
PJSUA2_THROW(Error);
|
||||
string (*readString)(const ContainerNode*,
|
||||
const string&)
|
||||
PJSUA2_THROW(Error);
|
||||
StringVector (*readStringVector)(const ContainerNode*,
|
||||
const string&)
|
||||
PJSUA2_THROW(Error);
|
||||
ContainerNode (*readContainer)(const ContainerNode*,
|
||||
const string &)
|
||||
PJSUA2_THROW(Error);
|
||||
ContainerNode (*readArray)(const ContainerNode*,
|
||||
const string &)
|
||||
PJSUA2_THROW(Error);
|
||||
void (*writeNumber)(ContainerNode*,
|
||||
const string &name,
|
||||
float num)
|
||||
PJSUA2_THROW(Error);
|
||||
void (*writeBool)(ContainerNode*,
|
||||
const string &name,
|
||||
bool value)
|
||||
PJSUA2_THROW(Error);
|
||||
void (*writeString)(ContainerNode*,
|
||||
const string &name,
|
||||
const string &value)
|
||||
PJSUA2_THROW(Error);
|
||||
void (*writeStringVector)(ContainerNode*,
|
||||
const string &name,
|
||||
const StringVector &value)
|
||||
PJSUA2_THROW(Error);
|
||||
ContainerNode (*writeNewContainer)(ContainerNode*,
|
||||
const string &name)
|
||||
PJSUA2_THROW(Error);
|
||||
ContainerNode (*writeNewArray)(ContainerNode*,
|
||||
const string &name)
|
||||
PJSUA2_THROW(Error);
|
||||
};
|
||||
|
||||
/*
|
||||
* Convenient macros.
|
||||
*/
|
||||
#define NODE_READ_BOOL(node,item) item = node.readBool(#item)
|
||||
#define NODE_READ_UNSIGNED(node,item) item = (unsigned)node.readNumber(#item)
|
||||
#define NODE_READ_INT(node,item) item = (int) node.readNumber(#item)
|
||||
#define NODE_READ_FLOAT(node,item) item = node.readNumber(#item)
|
||||
#define NODE_READ_NUM_T(node,T,item) item = (T)(int)node.readNumber(#item)
|
||||
#define NODE_READ_STRING(node,item) item = node.readString(#item)
|
||||
#define NODE_READ_STRINGV(node,item) item = node.readStringVector(#item)
|
||||
#define NODE_READ_OBJ(node,item) node.readObject(item)
|
||||
|
||||
#define NODE_WRITE_BOOL(node,item) node.writeBool(#item, item)
|
||||
#define NODE_WRITE_UNSIGNED(node,item) node.writeNumber(#item, (float)item)
|
||||
#define NODE_WRITE_INT(node,item) node.writeNumber(#item, (float)item)
|
||||
#define NODE_WRITE_NUM_T(node,T,item) node.writeNumber(#item, (float)item)
|
||||
#define NODE_WRITE_FLOAT(node,item) node.writeNumber(#item, item)
|
||||
#define NODE_WRITE_STRING(node,item) node.writeString(#item, item)
|
||||
#define NODE_WRITE_STRINGV(node,item) node.writeStringVector(#item, item)
|
||||
#define NODE_WRITE_OBJ(node,item) node.writeObject(item)
|
||||
|
||||
//! @endcond
|
||||
|
||||
/**
|
||||
* @} PJSUA2
|
||||
*/
|
||||
|
||||
} // namespace pj
|
||||
|
||||
|
||||
|
||||
#endif /* __PJSUA2_PERSISTENT_HPP__ */
|
||||
Reference in new issue
Block a user