259 lines
7.5 KiB
Java
259 lines
7.5 KiB
Java
package org.gcube.common.metadataprofilediscovery.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.InputStream;
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import java.io.StringReader;
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import java.util.ArrayList;
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import java.util.List;
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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.metadataprofilediscovery.jaxb.MetadataField;
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import org.gcube.common.metadataprofilediscovery.jaxb.MetadataFormat;
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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.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 MetadataFormatReader.
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*
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* @author Francesco Mangiacrapa francesco.mangiacrapa@isti.cnr.it
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* May 19, 2017
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*/
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public class MetadataFormatReader {
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private static Logger logger = LoggerFactory.getLogger(MetadataFormatReader.class);
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private ScopeBean scope;
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private MetadataFormat metadataFormat;
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private String resourceID;
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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 MetadataFormatReader(ScopeBean scope, String resourceID) throws Exception {
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this.scope = scope;
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this.resourceID = resourceID;
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this.metadataFormat = getMetadataFormatByResourceID(resourceID);
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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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* @param resourceID the resource id
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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 MetadataFormat getMetadataFormatByResourceID(String resourceID) throws Exception {
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logger.trace("Getting MedataFormat 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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MetadataFormat mf = new MetadataFormat();
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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 (Metadata Format) with 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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mf = getMetadataFormatFromResource(helper);
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String metadataSource = getMetadataFormatSourceFromResource(helper);
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mf.setMetadataSource(metadataSource);
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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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return mf;
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} finally{
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// ScopeProvider.instance.reset();
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}
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return mf;
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}
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/**
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* Gets the metadata format source from resource.
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*
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* @param helper the helper
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* @return the metadata format source from resource
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* @throws Exception the exception
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*/
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private String getMetadataFormatSourceFromResource(XPathHelper helper) throws Exception{
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try {
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List<String> metadataFormatSource = helper.evaluate("/Resource/Profile/Body/metadataformat");
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if(metadataFormatSource==null || metadataFormatSource.isEmpty())
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throw new Exception("metadataformat not found in the body, consider to add <metadataformat>");
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return metadataFormatSource.get(0);
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}catch(Exception e){
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logger.error("An error occurred in getMetadataFormatSourceFromResource ", e);
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return null;
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}
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}
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/**
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* Gets the metadata format from resource.
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*
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* @param helper the helper
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* @return the metadata format from resource
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* @throws Exception the exception
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*/
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private MetadataFormat getMetadataFormatFromResource(XPathHelper helper) throws Exception{
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try {
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List<String> metadataFormatSource = helper.evaluate("/Resource/Profile/Body/metadataformat");
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JAXBContext jaxbContext = JAXBContext.newInstance(MetadataFormat.class);
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Unmarshaller jaxbUnmarshaller = jaxbContext.createUnmarshaller();
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if(metadataFormatSource==null || metadataFormatSource.size()==0)
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throw new Exception("Resource does not contain <metadataformat> in the body");
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InputStream stream = new ByteArrayInputStream(metadataFormatSource.get(0).getBytes());
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MetadataFormat mtdf = (MetadataFormat) jaxbUnmarshaller.unmarshal(stream);
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logger.debug("returning metadata format with medata type: "+mtdf.getType());
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return mtdf;
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}catch(Exception e){
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logger.error("An error occurred in getMetadataFormatSourceFromResource ", e);
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return null;
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}
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}
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/**
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* Gets the metadata fields from resource.
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*
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* @param helper the helper
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* @return the metadata fields from resource
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* @throws Exception the exception
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*/
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private List<MetadataField> getMetadataFieldsFromResource(XPathHelper helper) throws Exception{
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try {
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List<String> metadatafields = helper.evaluate("/Resource/Profile/Body/metadataformat/metadatafield");
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if(metadatafields==null || metadatafields.isEmpty())
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throw new Exception("Metadata fields not found");
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JAXBContext jaxbContext = JAXBContext.newInstance(MetadataField.class);
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Unmarshaller jaxbUnmarshaller = jaxbContext.createUnmarshaller();
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// for (String string : metadatafields) {
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// logger.debug("mf "+string);
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// }
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List<MetadataField> mfs = new ArrayList<MetadataField>();
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logger.debug("MetadataFields are: "+metadatafields.size());
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for (String mfield : metadatafields) {
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try{
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InputStream stream = new ByteArrayInputStream(mfield.getBytes());
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MetadataField mtdf = (MetadataField) jaxbUnmarshaller.unmarshal(stream);
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logger.debug("Unmarshalled: "+mtdf);
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mfs.add(mtdf);
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}catch(Exception e){
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logger.error("An error occurred during unmarshall performing on "+mfield+", skipping this metadatafield");
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}
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}
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return mfs;
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} catch (Exception e) {
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logger.error("An error occurred in getMetadataFieldsFromResource ", e);
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return null;
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}
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}
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/**
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* Gets the scope.
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*
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* @return the scope
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*/
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public ScopeBean getScope() {
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return scope;
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}
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/**
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* Gets the metadata format.
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*
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* @return the metadataFormat
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*/
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public MetadataFormat getMetadataFormat() {
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return metadataFormat;
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}
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/**
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* Gets the resource id.
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*
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* @return the resourceID
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*/
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public String getResourceID() {
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return resourceID;
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}
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}
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