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// Copyright 2024 Proyectos y Sistemas de Mantenimiento SL (eProsima).
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#ifndef FASTDDS_EXAMPLES_CPP_CONTENT_FILTER__CUSTOMCONTENTFILTER_HPP
#define FASTDDS_EXAMPLES_CPP_CONTENT_FILTER__CUSTOMCONTENTFILTER_HPP
#include <fastcdr/Cdr.h>
#include <fastdds/dds/topic/IContentFilter.hpp>
#include <fastdds/rtps/common/CdrSerialization.hpp>
//! Custom filter class
//! It requieres two parameters 'low_mark_' and 'high_mark_'.
//! Filter samples which index is lower than 'low_mark_' and higher than 'high_mark_'.
class CustomContentFilter : public eprosima::fastdds::dds::IContentFilter
{
public:
/**
* @brief Construct a new CustomContentFilter object
*
* @param low_mark
* @param high_mark
*/
CustomContentFilter(
int low_mark,
int high_mark)
: low_mark_(low_mark)
, high_mark_(high_mark)
{
}
//! Destructor
virtual ~CustomContentFilter() = default;
/**
* @brief Evaluate filter discriminating whether the sample is relevant or not, i.e. whether it meets the filtering
* criteria
*
* @param payload Serialized sample
* @return true if sample meets filter requirements. false otherwise.
*/
bool evaluate(
const SerializedPayload& payload,
const FilterSampleInfo& /*sample_info*/,
const GUID_t& /*reader_guid*/) const override
{
// Deserialize the `index` field from the serialized sample.
eprosima::fastcdr::FastBuffer fastbuffer(reinterpret_cast<char*>(payload.data), payload.length);
eprosima::fastcdr::Cdr deser(fastbuffer, eprosima::fastcdr::Cdr::DEFAULT_ENDIAN,
eprosima::fastdds::rtps::DEFAULT_XCDR_VERSION);
// Deserialize encapsulation.
deser.read_encapsulation();
uint32_t index = 0;
// Deserialize `index` field.
try
{
deser >> index;
}
catch (eprosima::fastcdr::exception::NotEnoughMemoryException& /*exception*/)
{
return false;
}
// Custom filter: reject samples where index > low_mark_ and index < high_mark_.
if (index < low_mark_ || index > high_mark_)
{
return true;
}
return false;
}
private:
//! Low mark: lower threshold below which the samples are relevant
uint32_t low_mark_ = 0;
//! High mark: upper threshold over which the samples are relevant
uint32_t high_mark_ = 0;
};
#endif // FASTDDS_EXAMPLES_CPP_CONTENT_FILTER__CUSTOMCONTENTFILTER_HPP
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