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package eu.dnetlib.validator.service.impls.providers;
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import java.util.Iterator;
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import javax.xml.namespace.NamespaceContext;
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import javax.xml.xpath.XPath;
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import javax.xml.xpath.XPathExpressionException;
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import javax.xml.xpath.XPathFactory;
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import org.apache.log4j.Logger;
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import org.dom4j.DocumentException;
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import org.dom4j.io.DOMWriter;
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import org.w3c.dom.Document;
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import se.kb.oai.OAIException;
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import se.kb.oai.pmh.Identification;
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import se.kb.oai.pmh.OaiPmhServer;
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public class RepositoryChecks {
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private static Logger logger = Logger.getLogger(RepositoryChecks.class);
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public static boolean identifyRepository(String baseUrl) {
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logger.debug("sending identify request to repo " + baseUrl);
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OaiPmhServer harvester = new OaiPmhServer(baseUrl);
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if (baseUrl.trim().isEmpty()) {
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return false;
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}
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try {
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Identification identification = harvester.identify();
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DOMWriter d4Writer = new DOMWriter();
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Document d = d4Writer.write(identification.getResponse());
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return verifyIdentify(d);
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} catch (OAIException e) {
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logger.debug("Could not get response form " + baseUrl);
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return false;
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} catch (XPathExpressionException e) {
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logger.debug("Error verifying identify response", e);
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return false;
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} catch (DocumentException e) {
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logger.debug("Error verifying identify response", e);
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return false;
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}
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}
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private static boolean verifyIdentify(Document doc) throws XPathExpressionException {
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NamespaceContext ctx = new NamespaceContext() {
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public String getNamespaceURI(String prefix) {
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String uri;
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if (prefix.equals("oai"))
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uri = "http://www.openarchives.org/OAI/2.0/";
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else
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uri = null;
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return uri;
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}
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// Dummy implementation - not used!
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public Iterator<String> getPrefixes(String val) {
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return null;
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}
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// Dummy implemenation - not used!
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public String getPrefix(String uri) {
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return null;
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}
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};
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// Now the XPath expression
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String xpathStr = "//oai:OAI-PMH/oai:Identify";
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XPathFactory xpathFact = XPathFactory.newInstance();
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XPath xpath = xpathFact.newXPath();
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xpath.setNamespaceContext(ctx);
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String result = xpath.evaluate(xpathStr, doc);
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return (result != null && !result.equals(""));
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}
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}
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