org.n52.tamis.core.json.deserialize.processes.ProcessesDeserializer.java Source code

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Here is the source code for org.n52.tamis.core.json.deserialize.processes.ProcessesDeserializer.java

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/**
 * Copyright (C) 2016-2016 52North Initiative for Geospatial Open Source
 * Software GmbH
 *
 * This program is free software; you can redistribute it and/or modify it under
 * the terms of the GNU General Public License version 2 as publishedby the Free
 * Software Foundation.
 *
 * If the program is linked with libraries which are licensed under one of the
 * following licenses, the combination of the program with the linked library is
 * not considered a "derivative work" of the program:
 *
 *     - Apache License, version 2.0
 *     - Apache Software License, version 1.0
 *     - GNU Lesser General Public License, version 3
 *     - Mozilla Public License, versions 1.0, 1.1 and 2.0
 *     - Common Development and Distribution License (CDDL), version 1.0
 *
 * Therefore the distribution of the program linked with libraries licensed under
 * the aforementioned licenses, is permitted by the copyright holders if the
 * distribution is compliant with both the GNU General Public License version 2
 * and the aforementioned licenses.
 *
 * This program is distributed in the hope that it will be useful, but WITHOUT ANY
 * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A
 * PARTICULAR PURPOSE. See the GNU General Public License for more details.
 */
package org.n52.tamis.core.json.deserialize.processes;

import java.io.IOException;

import org.n52.tamis.core.javarepresentations.processes.ProcessDescription_forProcessList;
import org.n52.tamis.core.javarepresentations.processes.Processes_Tamis;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import com.fasterxml.jackson.core.JsonParser;
import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.core.ObjectCodec;
import com.fasterxml.jackson.databind.DeserializationContext;
import com.fasterxml.jackson.databind.JsonDeserializer;
import com.fasterxml.jackson.databind.JsonNode;

/**
 * Class to deserialize the extended processes document returned by the WPS
 * proxy.
 * 
 * @author Christian Danowski (contact: c.danowski@52north.org)
 *
 */
public class ProcessesDeserializer extends JsonDeserializer<Object> {

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

    @Override
    public Processes_Tamis deserialize(JsonParser jsonParser, DeserializationContext deserContext)
            throws IOException, JsonProcessingException {
        logger.info("Start deserialization of extended WPS processSummaries document.");

        // initialization
        ObjectCodec codec = jsonParser.getCodec();
        JsonNode node = codec.readTree(jsonParser);

        // create empty shortened CapabilitiesDocument.
        Processes_Tamis processes_short = new Processes_Tamis();

        /*
         * JSPON element "ProcessSummaries" is an array of process descriptions
         */
        JsonNode processSummaries = node.get("ProcessSummaries");

        transformAndAddProcessSummaries(processes_short, processSummaries);

        logger.info("Deserialization ended! The following processes description instance was created: {}",
                processes_short);

        return processes_short;

    }

    /**
     * Converts the extended JSON elements "ProcessSummaries" into instances of
     * {@link ProcessDescription_forProcessList} instances, which are added to
     * the processes_short instance.
     * 
     * @param processes_short
     *            instance of shortened process descriptions to which the
     *            converted process descriptions are added
     * @param processSummaries
     *            an array of extended process summaries
     */
    private void transformAndAddProcessSummaries(Processes_Tamis processes_short, JsonNode processSummaries) {
        for (JsonNode processSummary : processSummaries) {

            /*
             * empty new process description
             */
            ProcessDescription_forProcessList processDescription = new ProcessDescription_forProcessList();

            /*
             * id
             */
            String id = processSummary.get("identifier").asText();
            processDescription.setId(id);

            /*
             * label
             */
            String label = processSummary.get("title").asText();
            processDescription.setLabel(label);

            /*
             * description: the textual description may be found in the
             * "abstract" element of the extended process Description. However,
             * it might be missing!
             */
            if (processSummary.has("abstract"))
                processDescription.setDescription(processSummary.get("abstract").asText());
            else {
                // just set the title/label as description
                processDescription.setDescription(processDescription.getLabel());
            }

            /*
             * url
             * 
             * url is not set here! Insteadt URL will be set by
             * ProcessesForwarder, since there the baseURL can be extracted from
             * the HttpServletRequest object.
             */

            /*
             * add constructed process description
             */
            processes_short.addProcess(processDescription);
        }
    }

}