72 lines
2.9 KiB
Java
72 lines
2.9 KiB
Java
package org.gcube.portlets.widgets.ckandatapublisherwidget.server.utils;
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import static org.gcube.resources.discovery.icclient.ICFactory.client;
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import java.io.StringReader;
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import java.util.List;
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import javax.xml.parsers.DocumentBuilder;
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import javax.xml.parsers.DocumentBuilderFactory;
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import org.gcube.common.resources.gcore.utils.XPathHelper;
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import org.gcube.common.scope.api.ScopeProvider;
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import org.gcube.datacatalogue.utillibrary.shared.ex.ApplicationProfileNotFoundException;
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import org.gcube.portlets.widgets.ckandatapublisherwidget.server.CKANPublisherServicesImpl;
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import org.gcube.resources.discovery.client.api.DiscoveryClient;
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import org.gcube.resources.discovery.client.queries.api.Query;
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import org.gcube.resources.discovery.client.queries.impl.QueryBox;
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import org.slf4j.Logger;
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import org.slf4j.LoggerFactory;
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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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* Discover in a given context if there is a Generic Resource containing the list of tags to be used within the widget.
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* @author Costantino Perciante at ISTI-CNR (costantino.perciante@isti.cnr.it)
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*/
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public class DiscoverTagsList {
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private static final Logger logger = LoggerFactory.getLogger(CKANPublisherServicesImpl.class);
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private final static String APPLICATION_PROFILE_NAME = "Tags";
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private final static String QUERY = "for $profile in collection('/db/Profiles/GenericResource')//Resource " +
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"where $profile/Profile/SecondaryType/string() eq 'DataCatalogueMetadataTags' and $profile/Profile/Name/string() " +
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" eq '" + APPLICATION_PROFILE_NAME + "'" +
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"return $profile";
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/**
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* Discover the list of tags vocabulary if needed
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* @throws Exception
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*/
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public static List<String> discoverTagsList(String context){
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if(context == null || context.isEmpty())
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throw new IllegalArgumentException("Context cannot be empty or null!");
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String currentContext = ScopeProvider.instance.get();
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try{
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ScopeProvider.instance.set(context);
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Query q = new QueryBox(QUERY);
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DiscoveryClient<String> client = client();
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List<String> appProfile = client.submit(q);
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if (appProfile == null || appProfile.size() == 0)
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throw new ApplicationProfileNotFoundException("No DataCatalogueMetadataTags is registered in the infrastructure in context " + context);
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else{
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String elem = appProfile.get(0);
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DocumentBuilder docBuilder = DocumentBuilderFactory.newInstance().newDocumentBuilder();
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Node node = docBuilder.parse(new InputSource(new StringReader(elem))).getDocumentElement();
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XPathHelper helper = new XPathHelper(node);
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List<String> tagsVocabulary = helper.evaluate("/Resource/Profile/Body/tags/tag/text()");
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logger.debug("Retrieved tags " + tagsVocabulary);
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return tagsVocabulary;
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}
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}catch(Exception e){
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logger.warn("Failed to retrieve the list of tags vocabulary " + e.getMessage());
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}finally{
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ScopeProvider.instance.set(currentContext);
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}
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return null;
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}
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} |