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/*
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* To change this license header, choose License Headers in Project Properties.
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* To change this template file, choose Tools | Templates
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* and open the template in the editor.
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*/
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package eu.dnetlib.espas.util;
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import java.io.StringReader;
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import javax.xml.parsers.DocumentBuilderFactory;
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import org.apache.log4j.Logger;
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import org.apache.log4j.Priority;
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import org.w3c.dom.Node;
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import org.xml.sax.InputSource;
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/**
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*
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* @author George Athanasopoulos <george.athanasopoulos, at UoA>
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*/
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public class MetadataValidator {
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public enum ValidityStatus {Valid, Invalid, Unsupported};
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private static DocumentBuilderFactory docFactory;
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private static final Logger _logger = Logger.getLogger(MetadataValidator.class);
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static{
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docFactory= DocumentBuilderFactory.newInstance();
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docFactory.setNamespaceAware(true);
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}
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/** Returns true if the provided serialized form of the gml:element is either an accepted point or polygon instance.
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*/
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public static ValidityStatus isValidGMLLocation(String geomLocationChild){
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try {
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InputSource is = new InputSource();
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is.setCharacterStream(new StringReader(geomLocationChild));
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Node locationDoc = docFactory.newDocumentBuilder().parse(is);
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Node elementNode = locationDoc.getFirstChild();
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return isValidGMLLocation(elementNode);
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} catch (Exception ex) {
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_logger.log(Priority.ERROR, null, ex);
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return ValidityStatus.Invalid;
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}
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}
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/** Returns true if the provided gml:element is either an accepted point or polygon instance.
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*/
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public static ValidityStatus isValidGMLLocation(Node geomLocationChild){
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_logger.log(Priority.INFO, "Validating location gml element");
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try {
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String output = GeometryMetadataHandler.getGeoLocation(geomLocationChild);
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if(output.isEmpty())
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return ValidityStatus.Unsupported;
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else if (output==null)
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return ValidityStatus.Invalid;
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return ValidityStatus.Valid;
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} catch (Exception ex) {
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_logger.log(Priority.ERROR, null, ex);
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return ValidityStatus.Invalid;
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}
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}
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public static ValidityStatus isValidExtent(Node extentNode){
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_logger.log(Priority.INFO, "Validating gmd:extent element");
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try {
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// @todo: to update this implementation; an extent element may contain a list of geoextent, verticalextent and timeextent objects
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if(GeometryMetadataHandler.hasGeoExtent(extentNode) && GeometryMetadataHandler.getGeoExtent(extentNode).isEmpty())
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return ValidityStatus.Unsupported;
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if(GeometryMetadataHandler.hasVerticalExtent(extentNode) && GeometryMetadataHandler.getVerticalExtentMax(extentNode).isEmpty() && GeometryMetadataHandler.getVerticalExtentMin(extentNode).isEmpty())
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return ValidityStatus.Unsupported;
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if(TemporalMetadataHandler.hasTemporalExtent(extentNode) && TemporalMetadataHandler.getTemporalExtentStart(extentNode).isEmpty() && TemporalMetadataHandler.getTemporalExtentEnd(extentNode).isEmpty())
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return ValidityStatus.Unsupported;
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return ValidityStatus.Valid;
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} catch (Exception ex) {
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_logger.log(Priority.ERROR, null, ex);
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return ValidityStatus.Invalid;
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}
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}
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public static ValidityStatus isValidGeoExtent(String geoExtentNode){
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try {
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InputSource is = new InputSource();
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is.setCharacterStream(new StringReader(geoExtentNode));
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Node locationDoc = docFactory.newDocumentBuilder().parse(is);
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Node elementNode = locationDoc.getFirstChild();
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return isValidGeoExtent(elementNode);
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} catch (Exception ex) {
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_logger.log(Priority.ERROR, null, ex);
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return ValidityStatus.Invalid;
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}
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}
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public static ValidityStatus isValidGeoExtent(Node geoExtentNode){
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_logger.log(Priority.INFO, "Validating gmd:extent element");
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try {
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if(GeometryMetadataHandler.isGeoExtent(geoExtentNode) && GeometryMetadataHandler.getGeoExtent(geoExtentNode).isEmpty())
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return ValidityStatus.Unsupported;
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return ValidityStatus.Valid;
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} catch (Exception ex) {
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_logger.log(Priority.ERROR, null, ex);
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return ValidityStatus.Invalid;
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}
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}
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}
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