711 lines
23 KiB
C++
711 lines
23 KiB
C++
/* $Id$ */
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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
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* 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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* Shorthand functions for reading and writing from/to the root container
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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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* 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
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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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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.
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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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bool readBool(const string &name="") const
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PJSUA2_THROW(Error);
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/**
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* Read a string value from the container and return the value.
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* This will throw Error if the current element is not a string.
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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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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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*
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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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StringVector readStringVector(const string &name="") const
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PJSUA2_THROW(Error);
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/**
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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.
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*/
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void readObject(PersistentObject &obj) const
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PJSUA2_THROW(Error);
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/**
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* Read a container from the container. This will throw Error if the
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* current element is not an object. The read position will be advanced
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* 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 Container object.
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*/
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ContainerNode readContainer(const string &name="") const
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PJSUA2_THROW(Error);
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/**
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* Read array container from the container. This will throw Error if the
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* current element is not an array. The read position will be advanced
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* 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 Container object.
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*/
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ContainerNode readArray(const string &name="") const
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PJSUA2_THROW(Error);
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/**
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* Write a number value to the container.
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*
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* @param name The name for the value in the container.
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* @param num The value to be written.
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*/
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void writeNumber(const string &name,
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float num) PJSUA2_THROW(Error);
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/**
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* Write a number value to the container.
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*
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* @param name The name for the value in the container.
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* @param num The value to be written.
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*/
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void writeInt(const string &name,
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int num) PJSUA2_THROW(Error);
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/**
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* Write a boolean value to the container.
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*
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* @param name The name for the value in the container.
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* @param value The value to be written.
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*/
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void writeBool(const string &name,
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bool value) PJSUA2_THROW(Error);
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/**
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* Write a string value to the container.
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*
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* @param name The name for the value in the container.
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* @param value The value to be written.
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*/
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void writeString(const string &name,
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const string &value) PJSUA2_THROW(Error);
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/**
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* Write string vector to the container.
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*
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* @param name The name for the value in the container.
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* @param arr The vector to be written.
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*/
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void writeStringVector(const string &name,
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const StringVector &arr)
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PJSUA2_THROW(Error);
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/**
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* Write an object to the container. This is equal to calling
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* PersistentObject.writeObject(ContainerNode);
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*
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* @param obj The object to be written
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*/
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void writeObject(const PersistentObject &obj)
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PJSUA2_THROW(Error);
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/**
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* Create and write an empty Object node that can be used as parent
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* for subsequent write operations.
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*
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* @param name The name for the new container in the container.
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*
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* @return A sub-container.
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*/
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ContainerNode writeNewContainer(const string &name)
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PJSUA2_THROW(Error);
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/**
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* Create and write an empty array node that can be used as parent
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* for subsequent write operations.
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*
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* @param name The name for the array.
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*
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* @return A sub-container.
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*/
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ContainerNode writeNewArray(const string &name)
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PJSUA2_THROW(Error);
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};
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/**
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* Forward declaration of container_node_op.
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*/
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struct container_node_op;
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/**
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* Internal data for ContainerNode. See ContainerNode implementation notes
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* for more info.
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*/
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struct container_node_internal_data
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{
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void *doc; /**< The document. */
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void *data1; /**< Internal data 1 */
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void *data2; /**< Internal data 2 */
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};
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/**
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* A container node is a placeholder for storing other data elements, which
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* could be boolean, number, string, array of strings, or another container.
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* Each data in the container is basically a name/value pair, with a type
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* internally associated with it so that written data can be read in the
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* correct type. Data is read and written serially, hence the order of
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* reading must be the same as the order of writing.
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*
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* Application can read data from it by using the various read methods, and
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* write data to it using the various write methods. Alternatively, it
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* may be more convenient to use the provided macros below to read and write
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* the data, because these macros set the name automatically:
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* - NODE_READ_BOOL(node,item)
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* - NODE_READ_UNSIGNED(node,item)
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* - NODE_READ_INT(node,item)
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* - NODE_READ_FLOAT(node,item)
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* - NODE_READ_NUM_T(node,type,item)
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* - NODE_READ_STRING(node,item)
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* - NODE_READ_STRINGV(node,item)
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* - NODE_READ_OBJ(node,item)
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* - NODE_WRITE_BOOL(node,item)
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* - NODE_WRITE_UNSIGNED(node,item)
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* - NODE_WRITE_INT(node,item)
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* - NODE_WRITE_FLOAT(node,item)
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* - NODE_WRITE_NUM_T(node,type,item)
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* - NODE_WRITE_STRING(node,item)
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* - NODE_WRITE_STRINGV(node,item)
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* - NODE_WRITE_OBJ(node,item)
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*
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* Implementation notes:
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*
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* The ContainerNode class is subclass-able, but not in the usual C++ way.
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* With the usual C++ inheritance, some methods will be made pure virtual
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* and must be implemented by the actual class. However, doing so will
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* require dynamic instantiation of the ContainerNode class, which means
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* we will need to pass around the class as pointer, for example as the
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* return value of readContainer() and writeNewContainer() methods. Then
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* we will need to establish who needs or how to delete these objects, or
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* use shared pointer mechanism, each of which is considered too inconvenient
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* or complicated for the purpose.
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*
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* So hence we use C style "inheritance", where the methods are declared in
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* container_node_op and the data in container_node_internal_data structures.
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* An implementation of ContainerNode class will need to set up these members
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* with values that makes sense to itself. The methods in container_node_op
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* contains the pointer to the actual implementation of the operation, which
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* would be specific according to the format of the document. The methods in
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* this ContainerNode class are just thin wrappers which call the
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* implementation in the container_node_op structure.
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*
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*/
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class ContainerNode
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{
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public:
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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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bool hasUnread() const;
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/**
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* Get the name of the next unread element.
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*/
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string unreadName() const PJSUA2_THROW(Error);
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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 number 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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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.
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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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bool readBool(const string &name="") const
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PJSUA2_THROW(Error);
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/**
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* Read a string value from the container and return the value.
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* This will throw Error if the current element is not a string.
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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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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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*
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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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StringVector readStringVector(const string &name="") const
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PJSUA2_THROW(Error);
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/**
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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.
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*/
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void readObject(PersistentObject &obj) const
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PJSUA2_THROW(Error);
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/**
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* Read a container from the container. This will throw Error if the
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* current element is not a container. The read position will be advanced
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* 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 Container object.
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*/
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ContainerNode readContainer(const string &name="") const
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PJSUA2_THROW(Error);
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/**
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* Read array container from the container. This will throw Error if the
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* current element is not an array. The read position will be advanced
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* 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 Container object.
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*/
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ContainerNode readArray(const string &name="") const
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PJSUA2_THROW(Error);
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/**
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* 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__ */
|