mirror of
https://github.com/Telecominfraproject/wlan-cloud-lib-poco.git
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d8397b9153
- JSON: style and exceptions catch by ref fix - NumberParser: case-insensitive hex parsing - Dynamic::Var: const std::string& cast operator specialization (coaxing std::string ctor) - LocalDateTime: strftime fix (buffer too small for full tz string, use %Z instead of %z - makes no difference on windows but is more portable) - small buildwin.cmd vsvars32.bat call fix
111 lines
3.2 KiB
C++
111 lines
3.2 KiB
C++
//
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// Query.h
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//
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// $Id$
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//
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// Library: JSON
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// Package: JSON
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// Module: Query
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//
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// Definition of the Query class.
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//
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// Copyright (c) 2012, Applied Informatics Software Engineering GmbH.
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// and Contributors.
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//
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// Permission is hereby granted, free of charge, to any person or organization
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// obtaining a copy of the software and accompanying documentation covered by
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// this license (the "Software") to use, reproduce, display, distribute,
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// execute, and transmit the Software, and to prepare derivative works of the
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// Software, and to permit third-parties to whom the Software is furnished to
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// do so, all subject to the following:
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//
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// The copyright notices in the Software and this entire statement, including
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// the above license grant, this restriction and the following disclaimer,
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// must be included in all copies of the Software, in whole or in part, and
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// all derivative works of the Software, unless such copies or derivative
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// works are solely in the form of machine-executable object code generated by
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// a source language processor.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE, TITLE AND NON-INFRINGEMENT. IN NO EVENT
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// SHALL THE COPYRIGHT HOLDERS OR ANYONE DISTRIBUTING THE SOFTWARE BE LIABLE
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// FOR ANY DAMAGES OR OTHER LIABILITY, WHETHER IN CONTRACT, TORT OR OTHERWISE,
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// ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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// DEALINGS IN THE SOFTWARE.
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//
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#ifndef JSON_JSONQuery_INCLUDED
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#define JSON_JSONQuery_INCLUDED
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#include "Poco/JSON/JSON.h"
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#include "Poco/JSON/Object.h"
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#include "Poco/JSON/Array.h"
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namespace Poco {
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namespace JSON {
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class JSON_API Query
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/// Class that can be used to search for a value in a JSON object or array.
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{
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public:
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Query(const Dynamic::Var& source);
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/// Constructor. Pass the start object/array.
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virtual ~Query();
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/// Destructor
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Object::Ptr findObject(const std::string& path) const;
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/// Search for an object. When the object can't be found, an empty
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/// SharedPtr is returned.
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Array::Ptr findArray(const std::string& path) const;
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/// Search for an array. When the array can't be found, an empty
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/// SharedPtr is returned.
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Dynamic::Var find(const std::string& path) const;
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/// Searches a value
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/// For example: "person.children[0].name" will return the
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/// the name of the first child. When the value can't be found
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/// an empty value is returned.
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template<typename T>
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T findValue(const std::string& path, const T& def) const
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/// Searches for a value will convert it to the given type.
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/// When the value can't be found or has an invalid type
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/// the default value will be returned.
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{
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T result = def;
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Dynamic::Var value = find(path);
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if ( ! value.isEmpty() )
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{
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try
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{
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result = value.convert<T>();
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}
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catch(...) { }
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}
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return result;
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}
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std::string findValue(const char* path, const char* def) const
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/// Searches for a value will convert it to the given type.
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/// When the value can't be found or has an invalid type
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/// the default value will be returned.
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{
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return findValue<std::string>(path, def);
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}
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private:
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Dynamic::Var _source;
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};
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}} // namespace Poco::JSON
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#endif // JSON_JSONQuery_INCLUDED
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