mirror of
https://github.com/pocoproject/poco.git
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843ed4345e
* fix(ActiveRecord): missing ActiveRecordLib_API definitions for clang/gcc. * fix(FPEnvironment): export FPEnvironmentImpl classes (#4393, #3331) * fix(Crypto): export *Impl classes used from inlines (#4393, #3331) * fix(Dynamic): explicitly instantiate and export Dynamic::Struct for string and int (-fvisibility=hidden) (#4393, #3331) * fix(JSON): explicitly instantiate and export SharedPtr for JSON::Array and JSON::Object (-fvisibility=hidden) (#4393, #3331) * enh(CMake): Set symbol visibility to hidden (#4393, #3331) * enh(configure): user c++17 standard for iphone, Darwin and ARM-Linux. * fix(UTF): explicitly instantiate and export 16 and 32-bit strings (-fvisibility=hidden) (#4393, #3331) * fix(RecordSet): make Extraction.h internal and instantiate RecordsSet::column template functions only for supported types. (-fvisibility=hidden) (#4393, #3331) * fix(UTF): fix explicitly instantiation on Windows (-fvisibility=hidden) (#4393, #3331) * enh(CMake): Add github jobs for macOS with visibility set to hidden (#4393, #3331) * fix(CppParser): Add missing declarations for CppParser_API (#4393, #3331) * enh(CMake): Enable more options in github jobs for macOS with visibility set to hidden (#4393, #3331) * fix(MongoDB): Add missing MongoDB_API (#4393, #3331)
814 lines
17 KiB
C++
814 lines
17 KiB
C++
//
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// Object.h
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//
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// Library: JSON
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// Package: JSON
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// Module: Object
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//
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// Definition of the Object 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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// SPDX-License-Identifier: BSL-1.0
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//
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#ifndef JSON_Object_INCLUDED
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#define JSON_Object_INCLUDED
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#include "Poco/JSON/JSON.h"
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#include "Poco/JSON/Array.h"
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#include "Poco/JSON/Stringifier.h"
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#include "Poco/JSONString.h"
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#include "Poco/SharedPtr.h"
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#include "Poco/Dynamic/Var.h"
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#include "Poco/Dynamic/Struct.h"
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#include "Poco/Nullable.h"
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#include <map>
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#include <vector>
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#include <deque>
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#include <iostream>
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#include <sstream>
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namespace Poco {
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namespace JSON {
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class JSON_API Object;
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}
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#if defined(POCO_OS_FAMILY_WINDOWS)
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// Explicitly instatiated shared pointer in JSON library
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extern template class Poco::SharedPtr<Poco::JSON::Object>;
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#else
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// Explicitly instatiated shared pointer in JSON library
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extern template class JSON_API Poco::SharedPtr<Poco::JSON::Object>;
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#endif
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namespace JSON {
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class JSON_API Object
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/// Represents a JSON object. Object provides a representation based on
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/// shared pointers and optimized for performance. It is possible to
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/// convert Object to DynamicStruct. Conversion requires copying and therefore
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/// has performance penalty; the benefit is in improved syntax, eg:
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///
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/// std::string json = "{ \"test\" : { \"property\" : \"value\" } }";
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/// Parser parser;
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/// Var result = parser.parse(json);
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///
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/// // use pointers to avoid copying
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/// Object::Ptr object = result.extract<Object::Ptr>();
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/// Var test = object->get("test"); // holds { "property" : "value" }
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/// Object::Ptr subObject = test.extract<Object::Ptr>();
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/// test = subObject->get("property");
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/// std::string val = test.toString(); // val holds "value"
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///
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/// // copy/convert to Poco::DynamicStruct
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/// Poco::DynamicStruct ds = *object;
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/// val = ds["test"]["property"]; // val holds "value"
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///
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{
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public:
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using Ptr = SharedPtr<Object>;
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using ValueMap = std::map<std::string, Dynamic::Var>;
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using ValueType = ValueMap::value_type;
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using Iterator = ValueMap::iterator;
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using ConstIterator = ValueMap::const_iterator;
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using NameList = std::vector<std::string>;
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explicit Object(int options = 0);
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/// Creates an empty Object.
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///
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/// If JSON_PRESERVE_KEY_ORDER is specified, the object will
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/// preserve the items insertion order. Otherwise, items will be
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/// sorted by keys.
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///
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/// If JSON_ESCAPE_UNICODE is specified, when the object is
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/// stringified, all unicode characters will be escaped in the
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/// resulting string.
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Object(const Object& copy);
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/// Creates an Object by copying another one.
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///
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/// Struct is not copied to keep the operation as
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/// efficient as possible (when needed, it will be generated upon request).
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Object(Object&& other) noexcept;
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/// Move constructor
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~Object();
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/// Destroys the Object.
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Object &operator = (const Object &other);
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// Assignment operator
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Object &operator = (Object &&other) noexcept;
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// Move asignment operator
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void setEscapeUnicode(bool escape = true);
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/// Sets the flag for escaping unicode.
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bool getEscapeUnicode() const;
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/// Returns the flag for escaping unicode.
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void setLowercaseHex(bool lowercaseHex);
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/// Sets the flag for using lowercase hex numbers
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bool getLowercaseHex() const;
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/// Returns the flag for using lowercase hex numbers
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Iterator begin();
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/// Returns begin iterator for values.
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ConstIterator begin() const;
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/// Returns const begin iterator for values.
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Iterator end();
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/// Returns end iterator for values.
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ConstIterator end() const;
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/// Returns const end iterator for values.
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Dynamic::Var get(const std::string& key) const;
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/// Retrieves a property. An empty value is
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/// returned when the property doesn't exist.
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Array::Ptr getArray(const std::string& key) const;
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/// Returns a SharedPtr to an array when the property
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/// is an array. An empty SharedPtr is returned when
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/// the element doesn't exist or is not an array.
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Object::Ptr getObject(const std::string& key) const;
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/// Returns a SharedPtr to an object when the property
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/// is an object. An empty SharedPtr is returned when
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/// the property doesn't exist or is not an object
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template<typename T>
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T getValue(const std::string& key) const
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/// Retrieves the property with the given name and will
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/// try to convert the value to the given template type.
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/// The convert<T>() method of Var is called
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/// which can also throw exceptions for invalid values.
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/// Note: This will not work for an array or an object.
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{
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Dynamic::Var value = get(key);
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return value.convert<T>();
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}
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template<typename T>
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Poco::Nullable<T> getNullableValue(const std::string& key) const
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/// Retrieves the property with the given name and will
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/// try to convert the value to the given template type.
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///
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/// The convert<T> method of Var is called
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/// which can also throw exceptions for invalid values.
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/// Note: This will not work for an array or an object.
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{
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if (isNull(key))
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return Poco::Nullable<T>();
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Dynamic::Var value = get(key);
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return value.convert<T>();
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}
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void getNames(NameList& names) const;
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/// Fills the supplied vector with all property names.
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NameList getNames() const;
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/// Returns all property names.
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bool has(const std::string& key) const;
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/// Returns true when the given property exists.
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bool isArray(const std::string& key) const;
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/// Returns true when the given property contains an array.
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bool isArray(ConstIterator& it) const;
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/// Returns true when the given property contains an array.
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bool isNull(const std::string& key) const;
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/// Returns true when the given property contains a null value.
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bool isObject(const std::string& key) const;
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/// Returns true when the given property contains an object.
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bool isObject(ConstIterator& it) const;
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/// Returns true when the given property contains an object.
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template<typename T>
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T optValue(const std::string& key, const T& def) const
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/// Returns the value of a property when the property exists
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/// and can be converted to the given type. Otherwise
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/// def will be returned.
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{
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T value = def;
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ValueMap::const_iterator it = _values.find(key);
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if (it != _values.end() && ! it->second.isEmpty())
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{
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try
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{
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value = it->second.convert<T>();
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}
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catch (...)
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{
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// The default value will be returned
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}
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}
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return value;
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}
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std::size_t size() const;
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/// Returns the number of properties.
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Object& set(const std::string& key, const Dynamic::Var& value);
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/// Sets a new value.
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void stringify(std::ostream& out, unsigned int indent = 0, int step = -1) const;
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/// Prints the object to out stream.
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///
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/// When indent is 0, the object will be printed on a single
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/// line without indentation.
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void remove(const std::string& key);
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/// Removes the property with the given key.
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static Poco::DynamicStruct makeStruct(const Object::Ptr& obj);
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/// Utility function for creation of struct.
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static Poco::OrderedDynamicStruct makeOrderedStruct(const Object::Ptr& obj);
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/// Utility function for creation of ordered struct.
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operator const Poco::OrderedDynamicStruct& () const;
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/// Cast operator to Poco::OrderedDynamiStruct.
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operator const Poco::DynamicStruct& () const;
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/// Cast operator to Poco::DynamiStruct.
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void clear();
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/// Clears the contents of the object.
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///
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/// Insertion order preservation property is left intact.
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private:
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typedef std::deque<ValueMap::const_iterator> KeyList;
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typedef Poco::DynamicStruct::Ptr StructPtr;
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typedef Poco::OrderedDynamicStruct::Ptr OrdStructPtr;
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void syncKeys(const KeyList& keys);
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template <typename T>
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void resetDynStruct(T& pStruct) const
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{
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if (!pStruct)
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pStruct = new typename T::Type;
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else
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pStruct->clear();
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}
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template <typename C>
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void doStringify(const C& container, std::ostream& out, unsigned int indent, unsigned int step) const
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{
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int options = Poco::JSON_WRAP_STRINGS;
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options |= _escapeUnicode ? Poco::JSON_ESCAPE_UNICODE : 0;
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options |= _lowercaseHex ? Poco::JSON_LOWERCASE_HEX : 0;
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out << '{';
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if (indent > 0) out << std::endl;
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typename C::const_iterator it = container.begin();
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typename C::const_iterator end = container.end();
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for (; it != end;)
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{
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for (unsigned int i = 0; i < indent; i++) out << ' ';
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Stringifier::stringify(getKey(it), out, indent, step, options);
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out << ((indent > 0) ? ": " : ":");
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Stringifier::stringify(getValue(it), out, indent + step, step, options);
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if (++it != container.end()) out << ',';
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if (step > 0) out << std::endl;
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}
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if (indent >= step) indent -= step;
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for (unsigned int i = 0; i < indent; i++) out << ' ';
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out << '}';
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}
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template <typename S>
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static S makeStructImpl(const Object::Ptr& obj)
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{
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S ds;
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if (obj->_preserveInsOrder)
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{
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KeyList::const_iterator it = obj->_keys.begin();
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KeyList::const_iterator end = obj->_keys.end();
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for (; it != end; ++it)
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{
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if (obj->isObject((*it)->first))
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{
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Object::Ptr pObj = obj->getObject((*it)->first);
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S str = makeStructImpl<S>(pObj);
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ds.insert((*it)->first, str);
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}
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else if (obj->isArray((*it)->first))
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{
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Array::Ptr pArr = obj->getArray((*it)->first);
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std::vector<Poco::Dynamic::Var> v = Poco::JSON::Array::makeArray(pArr);
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ds.insert((*it)->first, v);
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}
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else
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ds.insert((*it)->first, (*it)->second);
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}
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}
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else
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{
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ConstIterator it = obj->begin();
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ConstIterator end = obj->end();
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for (; it != end; ++it)
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{
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if (obj->isObject(it))
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{
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Object::Ptr pObj = obj->getObject(it->first);
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S str = makeStructImpl<S>(pObj);
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ds.insert(it->first, str);
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}
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else if (obj->isArray(it))
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{
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Array::Ptr pArr = obj->getArray(it->first);
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std::vector<Poco::Dynamic::Var> v = Poco::JSON::Array::makeArray(pArr);
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ds.insert(it->first, v);
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}
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else
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ds.insert(it->first, it->second);
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}
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}
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return ds;
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}
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const std::string& getKey(ValueMap::const_iterator& it) const;
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const Dynamic::Var& getValue(ValueMap::const_iterator& it) const;
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const std::string& getKey(KeyList::const_iterator& it) const;
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const Dynamic::Var& getValue(KeyList::const_iterator& it) const;
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ValueMap _values;
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KeyList _keys;
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bool _preserveInsOrder;
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// Note:
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// The reason for this flag (rather than as argument to stringify()) is
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// because Object can be returned stringified from Dynamic::Var::toString(),
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// so it must know whether to escape unicode or not.
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bool _escapeUnicode;
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bool _lowercaseHex;
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mutable StructPtr _pStruct;
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mutable OrdStructPtr _pOrdStruct;
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mutable bool _modified;
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};
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//
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// inlines
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//
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inline void Object::setEscapeUnicode(bool escape)
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{
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_escapeUnicode = escape;
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}
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inline bool Object::getEscapeUnicode() const
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{
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return _escapeUnicode;
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}
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inline void Object::setLowercaseHex(bool lowercaseHex)
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{
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_lowercaseHex = lowercaseHex;
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}
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inline bool Object::getLowercaseHex() const
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{
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return _lowercaseHex;
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}
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inline Object::Iterator Object::begin()
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{
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return _values.begin();
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}
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inline Object::ConstIterator Object::begin() const
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{
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return _values.begin();
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}
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inline Object::Iterator Object::end()
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{
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return _values.end();
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}
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inline Object::ConstIterator Object::end() const
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{
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return _values.end();
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}
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inline bool Object::has(const std::string& key) const
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{
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ValueMap::const_iterator it = _values.find(key);
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return it != _values.end();
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}
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inline bool Object::isArray(const std::string& key) const
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{
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ValueMap::const_iterator it = _values.find(key);
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return isArray(it);
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}
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inline bool Object::isArray(ConstIterator& it) const
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{
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return it != _values.end() && (it->second.type() == typeid(Array::Ptr) || it->second.type() == typeid(Array));
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}
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inline bool Object::isNull(const std::string& key) const
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{
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ValueMap::const_iterator it = _values.find(key);
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return it == _values.end() || it->second.isEmpty();
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}
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inline bool Object::isObject(const std::string& key) const
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{
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ValueMap::const_iterator it = _values.find(key);
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return isObject(it);
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}
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inline bool Object::isObject(ConstIterator& it) const
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{
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return it != _values.end() && (it->second.type() == typeid(Object::Ptr) || it->second.type() == typeid(Object));
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}
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inline std::size_t Object::size() const
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{
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return static_cast<std::size_t>(_values.size());
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}
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inline void Object::remove(const std::string& key)
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{
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if (_preserveInsOrder)
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{
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KeyList::iterator it = _keys.begin();
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KeyList::iterator end = _keys.end();
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for (; it != end; ++it)
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{
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if (key == (*it)->first)
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{
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_keys.erase(it);
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break;
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}
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}
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}
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_values.erase(key);
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_modified = true;
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}
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inline const std::string& Object::getKey(ValueMap::const_iterator& it) const
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{
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return it->first;
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}
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inline const Dynamic::Var& Object::getValue(ValueMap::const_iterator& it) const
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{
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return it->second;
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}
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inline const Dynamic::Var& Object::getValue(KeyList::const_iterator& it) const
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{
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ValueMap::const_iterator itv = _values.find((*it)->first);
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if (itv != _values.end())
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return itv->second;
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else
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throw Poco::NotFoundException();
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}
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} } // namespace Poco::JSON
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namespace Poco {
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namespace Dynamic {
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template <>
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class VarHolderImpl<JSON::Object::Ptr>: public VarHolder
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{
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public:
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VarHolderImpl(const JSON::Object::Ptr& val): _val(val)
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{
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}
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~VarHolderImpl()
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{
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}
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const std::type_info& type() const
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{
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return typeid(JSON::Object::Ptr);
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}
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void convert(Int8&) const
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{
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throw BadCastException();
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}
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void convert(Int16&) const
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{
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throw BadCastException();
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}
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void convert(Int32&) const
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{
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throw BadCastException();
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}
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void convert(Int64&) const
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{
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throw BadCastException();
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}
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void convert(UInt8&) const
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{
|
|
throw BadCastException();
|
|
}
|
|
|
|
void convert(UInt16&) const
|
|
{
|
|
throw BadCastException();
|
|
}
|
|
|
|
void convert(UInt32&) const
|
|
{
|
|
throw BadCastException();
|
|
}
|
|
|
|
void convert(UInt64&) const
|
|
{
|
|
throw BadCastException();
|
|
}
|
|
|
|
void convert(bool& value) const
|
|
{
|
|
value = !_val.isNull() && _val->size() > 0;
|
|
}
|
|
|
|
void convert(float&) const
|
|
{
|
|
throw BadCastException();
|
|
}
|
|
|
|
void convert(double&) const
|
|
{
|
|
throw BadCastException();
|
|
}
|
|
|
|
void convert(char&) const
|
|
{
|
|
throw BadCastException();
|
|
}
|
|
|
|
void convert(std::string& s) const
|
|
{
|
|
std::ostringstream oss;
|
|
_val->stringify(oss);
|
|
s = oss.str();
|
|
}
|
|
|
|
void convert(DateTime& /*val*/) const
|
|
{
|
|
//TODO: val = _val;
|
|
throw NotImplementedException("Conversion not implemented: JSON:Object => DateTime");
|
|
}
|
|
|
|
void convert(LocalDateTime& /*ldt*/) const
|
|
{
|
|
//TODO: ldt = _val.timestamp();
|
|
throw NotImplementedException("Conversion not implemented: JSON:Object => LocalDateTime");
|
|
}
|
|
|
|
void convert(Timestamp& /*ts*/) const
|
|
{
|
|
//TODO: ts = _val.timestamp();
|
|
throw NotImplementedException("Conversion not implemented: JSON:Object => Timestamp");
|
|
}
|
|
|
|
VarHolder* clone(Placeholder<VarHolder>* pVarHolder = 0) const
|
|
{
|
|
return cloneHolder(pVarHolder, _val);
|
|
}
|
|
|
|
const JSON::Object::Ptr& value() const
|
|
{
|
|
return _val;
|
|
}
|
|
|
|
bool isArray() const
|
|
{
|
|
return false;
|
|
}
|
|
|
|
bool isInteger() const
|
|
{
|
|
return false;
|
|
}
|
|
|
|
bool isSigned() const
|
|
{
|
|
return false;
|
|
}
|
|
|
|
bool isNumeric() const
|
|
{
|
|
return false;
|
|
}
|
|
|
|
bool isString() const
|
|
{
|
|
return false;
|
|
}
|
|
|
|
private:
|
|
JSON::Object::Ptr _val;
|
|
};
|
|
|
|
|
|
template <>
|
|
class VarHolderImpl<JSON::Object>: public VarHolder
|
|
{
|
|
public:
|
|
VarHolderImpl(const JSON::Object& val): _val(val)
|
|
{
|
|
}
|
|
|
|
~VarHolderImpl()
|
|
{
|
|
}
|
|
|
|
const std::type_info& type() const
|
|
{
|
|
return typeid(JSON::Object);
|
|
}
|
|
|
|
void convert(Int8&) const
|
|
{
|
|
throw BadCastException();
|
|
}
|
|
|
|
void convert(Int16&) const
|
|
{
|
|
throw BadCastException();
|
|
}
|
|
|
|
void convert(Int32&) const
|
|
{
|
|
throw BadCastException();
|
|
}
|
|
|
|
void convert(Int64&) const
|
|
{
|
|
throw BadCastException();
|
|
}
|
|
|
|
void convert(UInt8&) const
|
|
{
|
|
throw BadCastException();
|
|
}
|
|
|
|
void convert(UInt16&) const
|
|
{
|
|
throw BadCastException();
|
|
}
|
|
|
|
void convert(UInt32&) const
|
|
{
|
|
throw BadCastException();
|
|
}
|
|
|
|
void convert(UInt64&) const
|
|
{
|
|
throw BadCastException();
|
|
}
|
|
|
|
void convert(bool& value) const
|
|
{
|
|
value = _val.size() > 0;
|
|
}
|
|
|
|
void convert(float&) const
|
|
{
|
|
throw BadCastException();
|
|
}
|
|
|
|
void convert(double&) const
|
|
{
|
|
throw BadCastException();
|
|
}
|
|
|
|
void convert(char&) const
|
|
{
|
|
throw BadCastException();
|
|
}
|
|
|
|
void convert(std::string& s) const
|
|
{
|
|
std::ostringstream oss;
|
|
_val.stringify(oss);
|
|
s = oss.str();
|
|
}
|
|
|
|
void convert(DateTime& /*val*/) const
|
|
{
|
|
//TODO: val = _val;
|
|
throw NotImplementedException("Conversion not implemented: JSON:Object => DateTime");
|
|
}
|
|
|
|
void convert(LocalDateTime& /*ldt*/) const
|
|
{
|
|
//TODO: ldt = _val.timestamp();
|
|
throw NotImplementedException("Conversion not implemented: JSON:Object => LocalDateTime");
|
|
}
|
|
|
|
void convert(Timestamp& /*ts*/) const
|
|
{
|
|
//TODO: ts = _val.timestamp();
|
|
throw NotImplementedException("Conversion not implemented: JSON:Object => Timestamp");
|
|
}
|
|
|
|
VarHolder* clone(Placeholder<VarHolder>* pVarHolder = 0) const
|
|
{
|
|
return cloneHolder(pVarHolder, _val);
|
|
}
|
|
|
|
const JSON::Object& value() const
|
|
{
|
|
return _val;
|
|
}
|
|
|
|
bool isArray() const
|
|
{
|
|
return false;
|
|
}
|
|
|
|
bool isInteger() const
|
|
{
|
|
return false;
|
|
}
|
|
|
|
bool isSigned() const
|
|
{
|
|
return false;
|
|
}
|
|
|
|
bool isNumeric() const
|
|
{
|
|
return false;
|
|
}
|
|
|
|
bool isString() const
|
|
{
|
|
return false;
|
|
}
|
|
|
|
private:
|
|
JSON::Object _val;
|
|
};
|
|
|
|
|
|
} } // namespace Poco::Dynamic
|
|
|
|
|
|
#endif // JSON_Object_INCLUDED
|