D-Net

/*

 * Copyright 2013 gathanas.

 *

 * 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 eu.dnetlib.espas.util;

import java.net.URI;

import java.sql.Timestamp;

import javax.xml.bind.JAXBElement;

import javax.xml.bind.JAXBException;

import javax.xml.bind.Unmarshaller;

import org.apache.log4j.Logger;

import org.apache.log4j.Priority;

import org.geotoolkit.gml.xml.v321.TimeInstantType;

import org.geotoolkit.gml.xml.v321.TimePeriodType;

import org.opengis.temporal.Period;

import org.opengis.temporal.TemporalPrimitive;

import org.w3c.dom.Element;

import org.w3c.dom.Node;

/**

 *

 * @author gathanas

 */

/**

 * This class supports the extraction of temporal details defined in the espas

 * model and encoded in GML v3.2 format

 */

class GMLTemporalTransformationHandler extends GMLTransformationHandler {

    private static final Logger _logger = Logger.getLogger(GMLTemporalTransformationHandler.class);

    public GMLTemporalTransformationHandler() {

        super();

    }

    public String getTemporalStartTime(Node gmlNode) {

        String result = "";

        try {

            _logger.log(Priority.DEBUG,"GetTemporal start input node is :\n" + MetadataHandler.serializeNode(gmlNode));

            if (!(gmlNode instanceof Element) || !((Element) gmlNode).getNamespaceURI().equalsIgnoreCase(SUPPORT_GML_SPEC))

                return null;

            Unmarshaller unMarshaller = this.acquireUnMarshaller();

            Object gmlObject = unMarshaller.unmarshal(gmlNode);

            if (gmlObject instanceof JAXBElement)

                gmlObject = ((JAXBElement) gmlObject).getValue();

            //        if this is not a geometry object then an emty result is returned

            if ((gmlObject instanceof TemporalPrimitive)){

                if ((gmlObject instanceof TimeInstantType))

                        result=  ((TimeInstantType)gmlObject).getTimePosition().getDateTime().toString();

                else if(gmlObject instanceof TimePeriodType)

                    result = getPeriodTime(((TimePeriodType)gmlObject), TimePeriodConstant.start);

            }

            //      free resources by releasing unmashaller instance

            releaseUnMarshaller(unMarshaller);

           _logger.log(Priority.INFO,"GML geometry is :\n" + result);

        } catch (Exception ex) {

            _logger.log(Priority.ERROR, null, ex);

        } finally {

            return result;

        }

    }

    public String getTemporalEndTime(Node gmlNode) {

        String result = "";

        try {

            _logger.log(Priority.DEBUG,"GetTemporal end input node is :\n" + MetadataHandler.serializeNode(gmlNode));

            if (!(gmlNode instanceof Element) /*|| !((Element) gmlNode).getNamespaceURI().equalsIgnoreCase(SUPPORT_GML_SPEC)*/)

                return null;

            Unmarshaller unMarshaller = this.acquireUnMarshaller();

            Object gmlObject = unMarshaller.unmarshal(gmlNode);

            if (gmlObject instanceof JAXBElement)

                gmlObject = ((JAXBElement) gmlObject).getValue();

            //        if this is not a temporal period object then an emty result is returned

            if ((gmlObject instanceof TemporalPrimitive)){

                if ((gmlObject instanceof TimeInstantType))

                        result=  ((TimeInstantType)gmlObject).getTimePosition().getDateTime().toString();

                else if(gmlObject instanceof TimePeriodType)

                    result = getPeriodTime(((TimePeriodType)gmlObject), TimePeriodConstant.end);

                }

            //      free resources by releasing unmashaller instance

            releaseUnMarshaller(unMarshaller);

            _logger.log(Priority.INFO,"GML geometry is :\n" + result);

        } catch (JAXBException ex) {

                _logger.log(Priority.ERROR, null, ex);

        } finally {

            return result;

        }

    }

    /** Parses the given gml:TimeInstant element and extracts the given content in a string format that can be inserted into a 

     * postgres db.

     */

    public String getTimeInstant(Node gmlNode) {

        String result = "";

        try {

            if (!(gmlNode instanceof Element) || !((Element) gmlNode).getNamespaceURI().equalsIgnoreCase(SUPPORT_GML_SPEC))

                return null;

            Unmarshaller unMarshaller = this.acquireUnMarshaller();

            Object gmlObject = unMarshaller.unmarshal(gmlNode);

            if (gmlObject instanceof JAXBElement)

                gmlObject = ((JAXBElement) gmlObject).getValue();

            //        if this is not a time instant object then an emty result is returned

            if ((gmlObject instanceof TimeInstantType))

                        result=  ((TimeInstantType)gmlObject).getTimePosition().getDateTime().toString();

            //      free resources by releasing unmashaller instance

            releaseUnMarshaller(unMarshaller);

            _logger.log(Priority.INFO,"GML geometry is :\n" + result);

        } catch (Exception ex) {

                _logger.log(Priority.ERROR, "Exception while processing time instant", ex);

        } finally {

            return result;

        }

    }

    /** This function supports the Time Period element parsing. It extracts the timeperiod end time in case this is specified inside a period element or the 

     * the time defined in a time instance element so as to comply to the application constraints agreed in espas. 

     */

   public String getTimePeriodEnd(Node timePeriodType) {

        String result = "";

        try {

            if (!(timePeriodType instanceof Element) || !((Element) timePeriodType).getNamespaceURI().equalsIgnoreCase(SUPPORT_GML_SPEC))

                return null;

            Unmarshaller unMarshaller = this.acquireUnMarshaller();

            Object gmlObject = unMarshaller.unmarshal(timePeriodType);

            if (gmlObject instanceof JAXBElement)

                gmlObject = ((JAXBElement) gmlObject).getValue();

            //        if this is not a time instant object then an emty result is returned

            if ((gmlObject instanceof TimeInstantType))

                        result=  ((TimeInstantType)gmlObject).getTimePosition().getDateTime().toString();

            else if(gmlObject instanceof TimePeriodType)

                result = getPeriodTime(((TimePeriodType)gmlObject), TimePeriodConstant.end);

            //      free resources by releasing unmashaller instance

            releaseUnMarshaller(unMarshaller);

            _logger.log(Priority.INFO,"GML geometry is :\n" + result);

        } catch (JAXBException ex) {

                _logger.log(Priority.ERROR, "Exception while processing time instant", ex);

        } finally {

            return result;

        }

    }

    /** This function supports the Time Period element parsing. It extracts the timeperiod start time in case this is specified inside a period element or the 

     * the time defined in a time instance element so as to comply to the application constraints agreed in espas. 

     */

   public String getTimePeriodStart(Node timePeriodType) {

        String result = "";

        try {

            if (!(timePeriodType instanceof Element) || !((Element) timePeriodType).getNamespaceURI().equalsIgnoreCase(SUPPORT_GML_SPEC))

                return null;

            Unmarshaller unMarshaller = this.acquireUnMarshaller();

            Object gmlObject = unMarshaller.unmarshal(timePeriodType);

            if (gmlObject instanceof JAXBElement)

                gmlObject = ((JAXBElement) gmlObject).getValue();

            //        if this is not a time instant object then an emty result is returned

            if ((gmlObject instanceof TimeInstantType))

                        result=  ((TimeInstantType)gmlObject).getTimePosition().getDateTime().toString();

            else if(gmlObject instanceof TimePeriodType)

                result = getPeriodTime(((TimePeriodType)gmlObject), TimePeriodConstant.start);

            //      free resources by releasing unmashaller instance

            releaseUnMarshaller(unMarshaller);

            _logger.log(Priority.INFO,"GML geometry is :\n" + result);

        } catch (JAXBException ex) {

                _logger.log(Priority.ERROR, "Exception while processing time instant", ex);

        } finally {

            return result;

        }

    }

   ////////////////////////////////////////////////////////////////////////////////////////////////////////////////

   ///                  Private functions used for assistive tasks

   enum TimePeriodConstant {start, end};

   private String getPeriodTime(TimePeriodType period, TimePeriodConstant periodConst){

       String output ="";

       switch(periodConst){

           case end:

               if (period.getEnd() != null)

                   output = period.getEnd().getTimeInstant().getTimePosition().getDateTime().toString();

               else if (period.getEndPosition() != null)

                   output = period.getEndPosition().getDateTime().toString();

               else if (period.getEnding() != null)

                   output = period.getEnding().getPosition().getDateTime().toString();

               break;

           case start:

               if (period.getEnd() != null)

                   output = period.getBegin().getTimeInstant().getTimePosition().getDateTime().toString();                        

               else if (period.getBeginPosition() != null)

                   output = period.getBeginPosition().getDateTime().toString();

               else if (period.getBeginning() != null)

                   output = period.getBeginning().getPosition().getDateTime().toString();

               break;

       }

       return output;

   }

}