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41622
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nikon.gasp
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package eu.dnetlib.validator.service.impls.providers;
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import java.io.IOException;
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import java.io.StringReader;
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import java.net.MalformedURLException;
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import java.net.URL;
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import java.net.URLEncoder;
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import java.util.ArrayList;
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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 javax.xml.parsers.ParserConfigurationException;
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import javax.xml.xpath.XPath;
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import javax.xml.xpath.XPathConstants;
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import javax.xml.xpath.XPathExpression;
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import javax.xml.xpath.XPathExpressionException;
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import javax.xml.xpath.XPathFactory;
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import org.springframework.beans.factory.annotation.Value;
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import org.w3c.dom.Document;
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import org.w3c.dom.Element;
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import org.w3c.dom.Node;
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import org.w3c.dom.NodeList;
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import org.w3c.dom.ls.DOMImplementationLS;
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import org.w3c.dom.ls.LSSerializer;
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import org.xml.sax.InputSource;
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import org.xml.sax.SAXException;
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import se.kb.oai.pmh.OaiPmhServer;
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import se.kb.oai.pmh.ResumptionToken;
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import se.kb.oai.pmh.Set;
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import se.kb.oai.pmh.SetsList;
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import eu.dnetlib.validator.engine.data.DataException;
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import eu.dnetlib.validator.engine.data.Provider;
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import eu.dnetlib.validator.engine.data.ResultSet;
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import eu.dnetlib.validator.engine.execution.ValidationObject;
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import eu.dnetlib.validator.service.impls.valobjs.XMLTextValidationObject;
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/**
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* A provider that retrieves records from an OAI-PMH repository. Resumption
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* tokens are handled transparently.
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*
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* @author Manos Karvounis
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*
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*/
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public class OAIPMHRecordProviderNew extends Provider {
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private static final long serialVersionUID = 3386029339653670731L;
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@Value("${services.validator.provider.timeout}")
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private int timeout;
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private int delay;
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private int retryDelay;
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private int retryEfforts;
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public static final String BASEURL = "BASEURL";
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public static final String METADATA_PREFIX = "metadataPrefix";
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/**
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* optional
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*/
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public static final String FROM = "from";
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/**
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* optional
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*/
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public static final String UNTIL = "until";
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/**
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* optional
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*/
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public static final String SET = "set";
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/**
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* The maximum time to wait for a response from the repository (in millis)
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*/
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// public static final String TIMEOUT = "TIMEOUT";
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/**
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* How much time to wait between consecutive HTTP requests to the repository
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* (in millis).
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*/
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// public static final String DELAY = "DELAY";
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/**
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* How much to wait if an HTTP request fails before trying again by
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* resending the request.
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*/
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// public static final String RETRY_DELAY = "RETRY_DELAY";
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/**
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* If an HTTP requests fails, how many times to try to resend the request.
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*/
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// public static final String RETRY_EFFORTS = "RETRY_EFFORTS";
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/**
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* How many records to test.
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*/
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public static final String RECORDS = "records";
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public OAIPMHRecordProviderNew() {
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super(1);
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}
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@Override
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public ResultSet<ValidationObject> getValidationObjects() throws ProviderException {
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return new OAIPMHRecordResultSet(this);
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}
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@Override
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public ResultSet<String> getValidationObjectIds() throws ProviderException {
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return new OAIPMHRecordIdentifierResultSet(this);
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}
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@Override
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public ValidationObject getValidationObject(String valObjId) throws ProviderException {
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OAIPMHResultSet oai = new OAIPMHResultSet(this);
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try {
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return new XMLTextValidationObject(oai.getRecord(valObjId));
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} catch (DataException e) {
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log.error("", e);
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throw new ProviderException();
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}
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}
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private class OAIPMHResultSet {
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protected DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
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protected DocumentBuilder builder;
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protected XPathFactory xfactory = XPathFactory.newInstance();
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protected NodeList recordIds = null;
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protected NodeList records = null;
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protected int index = -1;
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protected String resumptionToken = null;
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protected String error = null;
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private URLStreamer streamer = new URLStreamer();
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public OAIPMHResultSet(OAIPMHRecordProviderNew prv) {
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super();
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try {
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builder = factory.newDocumentBuilder();
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} catch (ParserConfigurationException e) {
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log.error("", e);
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}
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}
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protected NodeList getIds() throws DataException {
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NodeList recordIds = null;
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String surl = pros.getProperty(BASEURL) + "?verb=ListIdentifiers";
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if (resumptionToken == null || resumptionToken.trim().length() == 0) {
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surl += "&metadataPrefix=" + pros.getProperty(METADATA_PREFIX);
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if (pros.getProperty(FROM) != null)
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surl += "&from=" + pros.getProperty(FROM);
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if (pros.getProperty(UNTIL) != null)
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surl += "&until=" + pros.getProperty(UNTIL);
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if (!pros.getProperty(SET).equals("none"))
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surl += "&set=" + pros.getProperty(SET);
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} else {
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surl += "&resumptionToken=" + resumptionToken;
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}
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log.debug("Issuing request "+surl);
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String response = null;
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try {
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response = streamer.getResponse(new URL(surl), timeout, delay, retryDelay, retryEfforts);
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} catch (NumberFormatException e) {
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log.error("", e);
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throw new DataException();
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} catch (MalformedURLException e) {
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log.error("", e);
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throw new DataException();
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} catch (IOException e) {
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log.error("", e);
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throw new DataException();
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}
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try {
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InputSource is = new InputSource(new StringReader(response));
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Document doc = builder.parse(is);
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XPath xpath = xfactory.newXPath();
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XPathExpression expr = xpath.compile("OAI-PMH/ListIdentifiers/header/identifier/text()");
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recordIds = (NodeList) expr.evaluate(doc, XPathConstants.NODESET);
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XPath xpath2 = xfactory.newXPath();
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XPathExpression expr2 = xpath2.compile("OAI-PMH/ListIdentifiers/resumptionToken/text()");
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NodeList rtl = (NodeList) expr2.evaluate(doc, XPathConstants.NODESET);
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if (rtl == null || rtl.getLength() == 0) {
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log.debug("There seems to be no resumption token present");
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resumptionToken = null;
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}
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else {
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resumptionToken = rtl.item(0).getNodeValue();
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resumptionToken = URLEncoder.encode(resumptionToken, "UTF-8");
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log.debug("Found resumption token: "+resumptionToken);
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}
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} catch (Exception e) {
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log.error("", e);
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throw new DataException();
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}
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return recordIds;
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}
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protected NodeList getRecords() throws DataException {
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NodeList records = null;
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String surl = pros.getProperty(BASEURL) + "?verb=ListRecords";
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if (resumptionToken == null || resumptionToken.trim().length() == 0) {
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surl += "&metadataPrefix=" + pros.getProperty(METADATA_PREFIX);
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if (pros.getProperty(FROM) != null)
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surl += "&from=" + pros.getProperty(FROM);
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if (pros.getProperty(UNTIL) != null)
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surl += "&until=" + pros.getProperty(UNTIL);
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if (!pros.getProperty(SET).equals("none"))
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surl += "&set=" + pros.getProperty(SET);
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} else {
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surl += "&resumptionToken=" + resumptionToken;
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}
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String setError=null;
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if (!pros.getProperty(SET).equals("none")) {
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OaiPmhServer harvester = new OaiPmhServer(pros.getProperty(BASEURL));
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try {
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SetsList setList = harvester.listSets();
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ResumptionToken token = setList.getResumptionToken();
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List<Set> sets = new ArrayList<Set>();
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sets.addAll(setList.asList());
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while (token != null) {
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setList = harvester.listSets(token);
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token = setList.getResumptionToken();
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sets.addAll(setList.asList());
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}
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List<String> ret = new ArrayList<String>();
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for (Set set : sets) {
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ret.add(set.getSpec().trim());
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}
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if (!ret.contains(pros.getProperty(SET))){
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error = "Set: <b>'" + pros.getProperty(SET) + "'</b> is not exposed by the repository. \n Please make sure that 'ListSets' verb is configured correctly on your server as well as that the exposed sets list includes this set.";
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setError = error;
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}
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} catch (Exception e) {
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log.error("error getting sets from url: " + pros.getProperty(BASEURL), e);
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}
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}
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log.debug("Issuing request "+surl);
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String response = null;
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try {
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response = streamer.getResponse(new URL(surl), timeout, delay, retryDelay, retryEfforts);
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} catch (NumberFormatException e) {
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log.error("", e);
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throw new DataException();
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} catch (MalformedURLException e) {
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log.error("", e);
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throw new DataException();
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} catch (IOException e) {
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log.error("", e);
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throw new DataException();
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}
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try {
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InputSource is = new InputSource(new StringReader(response));
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Document doc = builder.parse(is);
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XPath xpath = xfactory.newXPath();
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// xpath.setNamespaceContext(new NamespaceResolver(doc));
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XPathExpression expr = xpath.compile("OAI-PMH/ListRecords/record");
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records = (NodeList) expr.evaluate(doc, XPathConstants.NODESET);
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XPath xpath2 = xfactory.newXPath();
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XPathExpression expr2 = xpath2.compile("OAI-PMH/ListRecords/resumptionToken/text()");
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NodeList rtl = (NodeList) expr2.evaluate(doc, XPathConstants.NODESET);
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log.debug("Check number of records: "+ records.getLength());
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if (records.getLength() == 0) {
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log.debug("There are no records: "+ records.getLength());
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XPath xpath3 = xfactory.newXPath();
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XPathExpression expr3 = xpath3.compile("OAI-PMH/error/text()");
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error = "The response on request: <a href=\""+ surl + "\">"+surl+"</a> was the following: ";
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error += "<br><b>" + (String) expr3.evaluate(doc, XPathConstants.STRING) + "</b>";
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if (setError != null) {
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error += "<br>" + setError;
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}
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log.debug("Error: "+ error);
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}
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if (rtl == null || rtl.getLength() == 0) {
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log.debug("There seems to be no resumption token present");
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resumptionToken = null;
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}
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else {
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resumptionToken = rtl.item(0).getNodeValue();
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resumptionToken = URLEncoder.encode(resumptionToken, "UTF-8");
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log.debug("Found resumption token: "+resumptionToken);
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}
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284 |
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} catch (Exception e) {
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log.error("", e);
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throw new DataException();
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287 |
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}
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288 |
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return records;
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}
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290 |
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291 |
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protected Document getRecord(String id) throws DataException {
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292 |
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String surl = pros.getProperty(BASEURL) + "?verb=GetRecord";
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293 |
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surl += "&metadataPrefix=" + pros.getProperty(METADATA_PREFIX);
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surl += "&identifier=" + id;
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log.debug("Issuing request: "+surl);
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297 |
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298 |
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String response = null;
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299 |
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try {
|
300 |
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response = streamer.getResponse(new URL(surl), timeout, delay, retryDelay, retryEfforts);
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301 |
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} catch (NumberFormatException e) {
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302 |
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log.error("", e);
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throw new DataException();
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304 |
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} catch (MalformedURLException e) {
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305 |
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log.error("", e);
|
306 |
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throw new DataException();
|
307 |
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} catch (IOException e) {
|
308 |
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log.error("", e);
|
309 |
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throw new DataException();
|
310 |
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}
|
311 |
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|
312 |
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InputSource is = new InputSource(new StringReader(response));
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313 |
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Document doc;
|
314 |
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try {
|
315 |
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doc = builder.parse(is);
|
316 |
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} catch (SAXException e) {
|
317 |
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log.error("", e);
|
318 |
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throw new DataException();
|
319 |
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} catch (IOException e) {
|
320 |
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log.error("", e);
|
321 |
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throw new DataException();
|
322 |
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}
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323 |
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|
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return doc;
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325 |
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}
|
326 |
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}
|
327 |
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|
328 |
|
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private class OAIPMHRecordResultSet extends OAIPMHResultSet implements ResultSet<ValidationObject> {
|
329 |
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|
330 |
|
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public OAIPMHRecordResultSet(OAIPMHRecordProviderNew prv) {
|
331 |
|
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super(prv);
|
332 |
|
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// TODO Auto-generated constructor stub
|
333 |
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}
|
334 |
|
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|
335 |
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@Override
|
336 |
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public String getError() {
|
337 |
|
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if (error != null)
|
338 |
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log.debug("An error occured "+ this.error);
|
339 |
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else
|
340 |
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log.debug("No errors on request");
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341 |
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return this.error;
|
342 |
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}
|
343 |
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|
344 |
|
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@Override
|
345 |
|
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public boolean next() throws DataException {
|
346 |
|
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index++;
|
347 |
|
|
|
348 |
|
|
log.debug("Moving cursor to result "+index);
|
349 |
|
|
if (records == null || index >= records.getLength()) {
|
350 |
|
|
// if we have previously received some results and there no more to take
|
351 |
|
|
if (records != null && (resumptionToken == null || resumptionToken.trim().length() == 0))
|
352 |
|
|
return false;
|
353 |
|
|
index = -1;
|
354 |
|
|
records = getRecords();
|
355 |
|
|
return next();
|
356 |
|
|
}
|
357 |
|
|
return true;
|
358 |
|
|
}
|
359 |
|
|
|
360 |
|
|
@Override
|
361 |
|
|
public ValidationObject get() throws DataException {
|
362 |
|
|
XMLTextValidationObject ret = null;
|
363 |
|
|
|
364 |
|
|
Document newXmlDocument;
|
365 |
|
|
try {
|
366 |
|
|
newXmlDocument = DocumentBuilderFactory.newInstance().newDocumentBuilder().newDocument();
|
367 |
|
|
|
368 |
|
|
Element root = newXmlDocument.createElement("root");
|
369 |
|
|
newXmlDocument.appendChild(root);
|
370 |
|
|
Node node = records.item(index);
|
371 |
|
|
Node copyNode = newXmlDocument.importNode(node, true);
|
372 |
|
|
root.appendChild(copyNode);
|
373 |
|
|
// printXmlDocument(newXmlDocument);
|
374 |
|
|
ret = new XMLTextValidationObject(newXmlDocument);
|
375 |
|
|
XPathFactory factory = XPathFactory.newInstance();
|
376 |
|
|
XPath xPath = factory.newXPath();
|
377 |
|
|
ret.setId(xPath.evaluate("header/identifier", records.item(index)));
|
378 |
|
|
ret.setStatus(xPath.evaluate("header/@status", records.item(index)));
|
379 |
|
|
|
380 |
|
|
} catch (ParserConfigurationException e) {
|
381 |
|
|
log.error("error getting object"+ e);
|
382 |
|
|
} catch (XPathExpressionException e) {
|
383 |
|
|
log.error("error getting object"+ e);
|
384 |
|
|
}
|
385 |
|
|
return ret;
|
386 |
|
|
}
|
387 |
|
|
|
388 |
|
|
}
|
389 |
|
|
|
390 |
|
|
public static void printXmlDocument(Document document) {
|
391 |
|
|
DOMImplementationLS domImplementationLS =
|
392 |
|
|
(DOMImplementationLS) document.getImplementation();
|
393 |
|
|
LSSerializer lsSerializer =
|
394 |
|
|
domImplementationLS.createLSSerializer();
|
395 |
|
|
String string = lsSerializer.writeToString(document);
|
396 |
|
|
System.out.println(string);
|
397 |
|
|
}
|
398 |
|
|
|
399 |
|
|
private class OAIPMHRecordIdentifierResultSet extends OAIPMHResultSet implements ResultSet<String> {
|
400 |
|
|
|
401 |
|
|
public OAIPMHRecordIdentifierResultSet(OAIPMHRecordProviderNew prv) {
|
402 |
|
|
super(prv);
|
403 |
|
|
// TODO Auto-generated constructor stub
|
404 |
|
|
}
|
405 |
|
|
|
406 |
|
|
@Override
|
407 |
|
|
public boolean next() throws DataException {
|
408 |
|
|
index++;
|
409 |
|
|
log.debug("Moving cursor to result "+index);
|
410 |
|
|
if (recordIds == null || index >= recordIds.getLength()) {
|
411 |
|
|
// if we have previously received some results and there no more to take
|
412 |
|
|
if (recordIds != null && (resumptionToken == null || resumptionToken.trim().length() == 0))
|
413 |
|
|
return false;
|
414 |
|
|
index = -1;
|
415 |
|
|
recordIds = getIds();
|
416 |
|
|
return next();
|
417 |
|
|
}
|
418 |
|
|
return true;
|
419 |
|
|
}
|
420 |
|
|
|
421 |
|
|
@Override
|
422 |
|
|
public String get() throws DataException {
|
423 |
|
|
String id = recordIds.item(index).getNodeValue();
|
424 |
|
|
|
425 |
|
|
log.debug("Returing object with id "+id);
|
426 |
|
|
|
427 |
|
|
return id;
|
428 |
|
|
}
|
429 |
|
|
|
430 |
|
|
@Override
|
431 |
|
|
public String getError() {
|
432 |
|
|
// TODO Auto-generated method stub
|
433 |
|
|
return null;
|
434 |
|
|
}
|
435 |
|
|
|
436 |
|
|
}
|
437 |
|
|
|
438 |
|
|
@Override
|
439 |
|
|
public ResultSet<ValidationObject> getValidationObjects(String entity)
|
440 |
|
|
throws ProviderException {
|
441 |
|
|
// TODO Auto-generated method stub
|
442 |
|
|
return null;
|
443 |
|
|
}
|
444 |
|
|
|
445 |
|
|
public Integer getTimeout() {
|
446 |
|
|
return timeout;
|
447 |
|
|
}
|
448 |
|
|
|
449 |
|
|
public void setTimeout(Integer timeout) {
|
450 |
|
|
this.timeout = timeout;
|
451 |
|
|
}
|
452 |
|
|
|
453 |
|
|
public Integer getDelay() {
|
454 |
|
|
return delay;
|
455 |
|
|
}
|
456 |
|
|
|
457 |
|
|
public void setDelay(Integer delay) {
|
458 |
|
|
this.delay = delay;
|
459 |
|
|
}
|
460 |
|
|
|
461 |
|
|
public Integer getRetryDelay() {
|
462 |
|
|
return retryDelay;
|
463 |
|
|
}
|
464 |
|
|
|
465 |
|
|
public void setRetryDelay(Integer retryDelay) {
|
466 |
|
|
this.retryDelay = retryDelay;
|
467 |
|
|
}
|
468 |
|
|
|
469 |
|
|
public Integer getRetryEfforts() {
|
470 |
|
|
return retryEfforts;
|
471 |
|
|
}
|
472 |
|
|
|
473 |
|
|
public void setRetryEfforts(Integer retryEfforts) {
|
474 |
|
|
this.retryEfforts = retryEfforts;
|
475 |
|
|
}
|
476 |
|
|
|
477 |
|
|
/*
|
478 |
|
|
class NamespaceResolver implements NamespaceContext {
|
479 |
|
|
|
480 |
|
|
private static final String OAI_NS = "http://www.openarchives.org/OAI/2.0/";
|
481 |
|
|
private static final String OAI_DC_NS = "http://www.openarchives.org/OAI/2.0/oai_dc/";
|
482 |
|
|
private static final String DC_NS = "http://purl.org/dc/elements/1.1/";
|
483 |
|
|
|
484 |
|
|
private final Document document;
|
485 |
|
|
|
486 |
|
|
public NamespaceResolver(Document document) {
|
487 |
|
|
this.document = document;
|
488 |
|
|
}
|
489 |
|
|
|
490 |
|
|
public String getNamespaceURI(String prefix) {
|
491 |
|
|
log.debug("prefix: " + prefix);
|
492 |
|
|
if ("".equals(prefix) || "oai".equals(prefix)){
|
493 |
|
|
return OAI_NS;
|
494 |
|
|
}else if ("oai_dc".equals(prefix)){
|
495 |
|
|
return OAI_DC_NS;
|
496 |
|
|
}else if ("dc".equals(prefix)){
|
497 |
|
|
return DC_NS;
|
498 |
|
|
}
|
499 |
|
|
return "";
|
500 |
|
|
}
|
501 |
|
|
|
502 |
|
|
public String getPrefix(String namespaceURI) {
|
503 |
|
|
log.debug("prefix: " + namespaceURI);
|
504 |
|
|
return "";
|
505 |
|
|
}
|
506 |
|
|
|
507 |
|
|
@SuppressWarnings("rawtypes")
|
508 |
|
|
public Iterator getPrefixes(String namespaceURI) {
|
509 |
|
|
// not implemented
|
510 |
|
|
return null;
|
511 |
|
|
}
|
512 |
|
|
|
513 |
|
|
} */
|
514 |
|
|
|
515 |
|
|
}
|