com.cefriel.util.RmlLiftingAggregationStrategy Maven / Gradle / Ivy

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Chimera Component for the Apache Camel framework that enables RML based mappings through a fork of the rmlmapper library

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/*
 * Copyright (c) 2019-2022 Cefriel.
 *
 * 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.
 */
package com.cefriel.util;

import com.cefriel.graph.RDFGraph;
import com.cefriel.rml.RmlProcessor;
import org.apache.camel.AggregationStrategy;
import org.apache.camel.Exchange;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

public class RmlLiftingAggregationStrategy extends RmlProcessor implements AggregationStrategy {

    private final Logger logger = LoggerFactory.getLogger(RmlLiftingAggregationStrategy.class);

    public Exchange aggregate(Exchange oldExchange, Exchange newExchange) {

        RDFGraph graph;
        if (oldExchange.getMessage().getBody(RDFGraph.class) == null) {
            graph = newExchange.getMessage().getBody(RDFGraph.class);
            oldExchange.setProperty(ChimeraConstants.GRAPH, graph);
            return oldExchange;
        }
        else {
            graph = oldExchange.getMessage().getBody(RDFGraph.class);
            newExchange.setProperty(ChimeraConstants.GRAPH, graph);
            return newExchange;
        }
    }

}