205 lines
6.5 KiB
Java
205 lines
6.5 KiB
Java
/**
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*
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*/
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package org.gcube.datacatalogue.metadatadiscovery.reader;
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import static org.gcube.resources.discovery.icclient.ICFactory.client;
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import java.io.ByteArrayInputStream;
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import java.io.IOException;
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import java.io.InputStream;
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import java.io.StringReader;
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import java.util.List;
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import java.util.Properties;
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import javax.xml.bind.JAXBContext;
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import javax.xml.bind.Unmarshaller;
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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.impl.ScopeBean;
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import org.gcube.datacatalogue.metadatadiscovery.bean.jaxb.NamespaceCategories;
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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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* The Class NamespaceCategoryReader.
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*
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* @author Francesco Mangiacrapa francesco.mangiacrapa@isti.cnr.it
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* Apr 26, 2017
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*/
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public class NamespaceCategoryReader {
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/**
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*
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*/
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public static final String NAMESPACES_CATALOGUE_CATEGORIES_PROPERTIES = "NamespacesCatalogueCategories.properties";
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private static Logger logger = LoggerFactory.getLogger(NamespaceCategoryReader.class);
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private ScopeBean scope;
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private String resourceID;
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private NamespaceCategories namespaces;
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/**
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* Instantiates a new medata format reader.
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*
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* @param scope the scope
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* @param resourceID the resource id
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* @throws Exception the exception
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*/
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public NamespaceCategoryReader(ScopeBean scope, String resourceID) throws Exception {
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this.scope = scope;
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this.resourceID = resourceID;
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if(resourceID == null || resourceID.isEmpty())
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throw new Exception("Please, specify a valid ResourceID in the property file: "+NAMESPACES_CATALOGUE_CATEGORIES_PROPERTIES);
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readNamespaceCategoryByResourceID();
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}
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/**
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* Gets the metadata format by id.
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*
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* @return the metadata format by id
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* @throws Exception the exception
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*/
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private void readNamespaceCategoryByResourceID() throws Exception {
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logger.trace("Getting Namespace Category for resourceID: "+resourceID);
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if(this.scope==null)
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throw new Exception("Scope is null");
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String scopeString = this.scope.toString();
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logger.trace("read scope: "+scopeString);
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namespaces = new NamespaceCategories();
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try {
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logger.info("Using scope from ScopeProvider: "+scopeString);
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String queryString = QueryForResourceUtil.queryForGenericResourceById(resourceID);
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logger.trace("queryString: " +queryString);
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Query q = new QueryBox(queryString);
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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 MetadataProfileNotFoundException("Your resourceID "+resourceID+" is not registered in the infrastructure, the scope is "+scopeString);
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else {
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String theResource = null;
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try{
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theResource = appProfile.get(0);
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// logger.trace("Resource with resourceID "+resourceID+" matched "+theResource);
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logger.debug("Resource (Namespaces Catalogue Categories) within resourceID "+resourceID+" found");
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DocumentBuilder docBuilder = DocumentBuilderFactory.newInstance().newDocumentBuilder();
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Node node = docBuilder.parse(new InputSource(new StringReader(theResource))).getDocumentElement();
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XPathHelper helper = new XPathHelper(node);
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// List<MetadataField> fields = getMetadataFieldsFromResource(helper);
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// mf.setMetadataFields(fields);
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logger.debug("Unmarshalling it..");
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readNamespaceCategoryFromResource(helper);
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}catch(Exception e){
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logger.error("Error while parsing Resource "+theResource+" from the infrastructure, the scope is "+scopeString,e);
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}
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}
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} catch (Exception e) {
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logger.error("Error while trying to fetch resourceID "+resourceID+" from the infrastructure, the scope is "+scopeString,e);
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throw new Exception("Error while trying to fetch resourceID "+resourceID+" from the infrastructure, the scope is "+scopeString, e);
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} finally{
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// ScopeProvider.instance.reset();
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}
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}
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/**
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* Read namespace category from resource.
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*
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* @param helper the helper
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* @throws Exception the exception
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*/
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private void readNamespaceCategoryFromResource(XPathHelper helper) throws Exception{
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try {
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List<String> namespaceSources = helper.evaluate("/Resource/Profile/Body/namespaces");
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JAXBContext jaxbContext = JAXBContext.newInstance(NamespaceCategories.class);
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Unmarshaller jaxbUnmarshaller = jaxbContext.createUnmarshaller();
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if(namespaceSources==null || namespaceSources.size()==0){
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throw new Exception("Resource does not contain <namespaces> <namespace>...</namespace> </namespaces> in the body");
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}
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InputStream stream = new ByteArrayInputStream(namespaceSources.get(0).getBytes());
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namespaces = (NamespaceCategories) jaxbUnmarshaller.unmarshal(stream);
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}catch(Exception e){
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String error = "An error occurred in readNamespaceCategoryFromResource " + e.getMessage();
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logger.error("An error occurred in readNamespaceCategoryFromResource ", e);
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throw new Exception(error);
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}
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}
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/**
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* Namespaces catalogue categories resource id.
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*
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* @return the string
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* @throws PropertyFileNotFoundException the property file not found exception
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*/
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public static String NamespacesCatalogueCategoriesResourceID() throws PropertyFileNotFoundException {
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Properties prop = new Properties();
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try {
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InputStream in = NamespaceCategoryReader.class.getResourceAsStream(NAMESPACES_CATALOGUE_CATEGORIES_PROPERTIES);
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// load a properties file
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prop.load(in);
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return prop.getProperty("RESOURCE_ID");
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} catch (IOException e) {
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logger.error("An error occurred on read property file "+NAMESPACES_CATALOGUE_CATEGORIES_PROPERTIES, e);
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throw new PropertyFileNotFoundException("An error occurred on read property file "+NAMESPACES_CATALOGUE_CATEGORIES_PROPERTIES+": "+e);
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}
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}
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/**
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* Gets the namespaces.
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*
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* @return the namespaces
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*/
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public NamespaceCategories getNamespaces() {
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return namespaces;
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}
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/* (non-Javadoc)
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* @see java.lang.Object#toString()
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*/
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@Override
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public String toString() {
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StringBuilder builder = new StringBuilder();
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builder.append("NamespaceCategoryReader [scope=");
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builder.append(scope);
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builder.append(", resourceID=");
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builder.append(resourceID);
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builder.append(", namespaces=");
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builder.append(namespaces);
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builder.append("]");
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return builder.toString();
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}
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}
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