Java tutorial
/** * 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.serialize.processes.execute; import java.io.IOException; import org.n52.tamis.core.javarepresentations.processes.execute.ExecuteInput; import org.slf4j.Logger; import org.slf4j.LoggerFactory; import com.fasterxml.jackson.core.JsonGenerator; import com.fasterxml.jackson.core.JsonProcessingException; import com.fasterxml.jackson.databind.JsonSerializer; import com.fasterxml.jackson.databind.SerializerProvider; /** * Serializes the simple JSON HTTP POST input element of the request body. * * Inputs are distuingished by their value parameter. If value contains an HTTP * address, the value will be converted to a "Reference"-WPS-input element. * Otherwise the input will be converted to a "Data"-WPS-input element. * * @author Christian Danowski (contact: c.danowski@52north.org) * */ public class ExecuteInputSerializer extends JsonSerializer<ExecuteInput> { private final static Logger logger = LoggerFactory.getLogger(ExecuteInputSerializer.class); @Override public void serialize(ExecuteInput input_simple, JsonGenerator jsonGenerator, SerializerProvider serProvider) throws IOException, JsonProcessingException { logger.info("Start serialization of input \"{}\"", input_simple); String inputValue = input_simple.getValue(); /* * usually, any Web links should be mapped to a WPS "Reference" element. * But if the URL is a SOS (possibly even timeseries REST) URL, then the * WPS expects it as Data!!! * * so: 1. if url contains "timeseries" then map it to Data. * * 2. else write the input as WPS "Reference" element */ if (inputValue.contains("http")) { logger.debug("detected \"http\" inside value of the input."); if (inputValue.contains("timeseries") || inputValue.contains("SOS") || inputValue.contains("sos")) { /* * although this is a Web link, we will serialize it as "Data", * since it is a SOS URL, which is expected as "Data" by the WPS */ logger.info("SOS-URL detected: \"{}\"", inputValue); writeAsData(jsonGenerator, input_simple); } else writeAsReference(jsonGenerator, input_simple); } else { writeAsData(jsonGenerator, input_simple); } logger.info("serialization of input ended."); } private void writeAsData(JsonGenerator jsonGenerator, ExecuteInput input) throws IOException { /* * write the input as WPS "Data" element * * expected structure looks like: * * { "Data": { "_mimeType": "text/xml", "_schema": * "http://schemas.opengis.net/gml/3.2.1/base/feature.xsd", * "__text": "value" }, * "_id": "target-variable-point" * } * * */ logger.info("Input \"{}\" is serialized as WPS \"Data\".", input); jsonGenerator.writeStartObject(); jsonGenerator.writeObjectFieldStart("Data"); jsonGenerator.writeStringField("_text", input.getValue()); /* * TODO parameters "_mimeType" and "_schema"? */ // jsonGenerator.writeStringField("_mimeType", "application/om+xml; // version=2.0"); // jsonGenerator.writeStringField("_schema", // "http://schemas.opengis.net/om/2.0/observation.xsd"); jsonGenerator.writeEndObject(); jsonGenerator.writeStringField("_id", input.getId()); jsonGenerator.writeEndObject(); } private void writeAsReference(JsonGenerator jsonGenerator, ExecuteInput input) throws IOException { /* * expected structure looks like: * * "Reference": { "_href": * "http://fluggs.wupperverband.de/sos2/service?service=SOS&request=GetObservation&version=2.0.0&offering=Zeitreihen_2m_Tiefe&observedProperty=Grundwasserstand&responseFormat=http%3A//www.opengis.net/om/2.0", * "_mimeType": "application/om+xml; version=2.0", "_schema": * "http://schemas.opengis.net/om/2.0/observation.xsd" }, "_id": * "gw1" } * */ logger.info("Input \"{}\" is serialized as WPS \"Reference\".", input); jsonGenerator.writeStartObject(); jsonGenerator.writeObjectFieldStart("Reference"); // jsonGenerator.writeStartObject(); jsonGenerator.writeStringField("_href", input.getValue()); /* * parameters "_mimeType" and "_schema" can be set to SOS values, if * the link is a SOS request! * * Else we do not know anything about the mimeType. Thus we cannot * set it. */ jsonGenerator.writeEndObject(); jsonGenerator.writeStringField("_id", input.getId()); jsonGenerator.writeEndObject(); } }