148 lines
3.9 KiB
C++
148 lines
3.9 KiB
C++
/*
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* Copyright 2007-2017 Content Management AG
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* All rights reserved.
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*
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* author: Max Kellermann <mk@cm4all.com>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* - Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* - Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the
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* distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* FOUNDATION OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
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* OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef ODBUS_READ_ITER_HXX
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#define ODBUS_READ_ITER_HXX
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#include "Iter.hxx"
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#include "util/Compiler.h"
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#include "util/ConstBuffer.hxx"
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#if GCC_OLDER_THAN(8,0)
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/* switch off completely bogus shadow warnings in older GCC
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versions */
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#pragma GCC diagnostic ignored "-Wshadow"
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#endif
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namespace ODBus {
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class ReadMessageIter : public MessageIter {
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struct RecurseTag {};
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ReadMessageIter(RecurseTag, ReadMessageIter &parent) noexcept {
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dbus_message_iter_recurse(&parent.iter, &iter);
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}
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public:
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explicit ReadMessageIter(DBusMessage &msg) noexcept {
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dbus_message_iter_init(&msg, &iter);
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}
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bool HasNext() noexcept {
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return dbus_message_iter_has_next(&iter);
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}
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bool Next() noexcept {
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return dbus_message_iter_next(&iter);
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}
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int GetArgType() noexcept {
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return dbus_message_iter_get_arg_type(&iter);
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}
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const char *GetSignature() noexcept {
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return dbus_message_iter_get_signature(&iter);
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}
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void GetBasic(void *value) noexcept {
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dbus_message_iter_get_basic(&iter, value);
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}
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const char *GetString() noexcept {
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const char *value;
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GetBasic(&value);
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return value;
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}
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template<typename T>
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ConstBuffer<T> GetFixedArray() noexcept {
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void *value;
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int n_elements;
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dbus_message_iter_get_fixed_array(&iter, &value, &n_elements);
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return {(const T *)value, size_t(n_elements)};
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}
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/**
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* Create a new iterator which recurses into a container
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* value.
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*/
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ReadMessageIter Recurse() noexcept {
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return {RecurseTag(), *this};
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}
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/**
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* Invoke a function for each element (including the current
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* one), as long as the argument type is the specified one.
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*/
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template<typename F>
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void ForEach(int arg_type, F &&f) {
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for (; GetArgType() == arg_type; Next())
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f(*this);
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}
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/**
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* Wrapper for ForEach() which passes a recursed iterator for
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* each element.
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*/
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template<typename F>
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void ForEachRecurse(int arg_type, F &&f) {
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ForEach(arg_type, [&f](auto &&i){
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f(i.Recurse());
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});
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}
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/**
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* Invoke a function for each name/value pair (string/variant)
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* in a dictionary (array containing #DBUS_TYPE_DICT_ENTRY).
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* The function gets two parameters: the property name (as C
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* string) and the variant value (as #ReadMessageIter).
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*/
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template<typename F>
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void ForEachProperty(F &&f) {
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ForEachRecurse(DBUS_TYPE_DICT_ENTRY, [&f](auto &&i){
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if (i.GetArgType() != DBUS_TYPE_STRING)
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return;
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const char *name = i.GetString();
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i.Next();
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if (i.GetArgType() != DBUS_TYPE_VARIANT)
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return;
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f(name, i.Recurse());
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});
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}
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};
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} /* namespace ODBus */
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#endif
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