forked from D-Net/dnet-hadoop
83 lines
3.2 KiB
Java
83 lines
3.2 KiB
Java
package eu.dnetlib.dhp.collection.plugin.oai;
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import com.google.common.base.Splitter;
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import com.google.common.collect.Iterators;
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import com.google.common.collect.Lists;
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import eu.dnetlib.collector.worker.model.ApiDescriptor;
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import eu.dnetlib.dhp.collection.plugin.CollectorPlugin;
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import eu.dnetlib.dhp.collection.worker.DnetCollectorException;
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import java.util.ArrayList;
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import java.util.Iterator;
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import java.util.List;
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import java.util.Spliterator;
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import java.util.Spliterators;
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import java.util.stream.Stream;
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import java.util.stream.StreamSupport;
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public class OaiCollectorPlugin implements CollectorPlugin {
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private static final String FORMAT_PARAM = "format";
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private static final String OAI_SET_PARAM = "set";
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private static final Object OAI_FROM_DATE_PARAM = "fromDate";
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private static final Object OAI_UNTIL_DATE_PARAM = "untilDate";
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private OaiIteratorFactory oaiIteratorFactory;
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@Override
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public Stream<String> collect(final ApiDescriptor api) throws DnetCollectorException {
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final String baseUrl = api.getBaseUrl();
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final String mdFormat = api.getParams().get(FORMAT_PARAM);
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final String setParam = api.getParams().get(OAI_SET_PARAM);
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final String fromDate = api.getParams().get(OAI_FROM_DATE_PARAM);
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final String untilDate = api.getParams().get(OAI_UNTIL_DATE_PARAM);
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final List<String> sets = new ArrayList<>();
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if (setParam != null) {
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sets.addAll(
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Lists.newArrayList(
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Splitter.on(",").omitEmptyStrings().trimResults().split(setParam)));
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}
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if (sets.isEmpty()) {
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// If no set is defined, ALL the sets must be harvested
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sets.add("");
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}
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if (baseUrl == null || baseUrl.isEmpty()) {
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throw new DnetCollectorException("Param 'baseurl' is null or empty");
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}
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if (mdFormat == null || mdFormat.isEmpty()) {
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throw new DnetCollectorException("Param 'mdFormat' is null or empty");
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}
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if (fromDate != null && !fromDate.matches("\\d{4}-\\d{2}-\\d{2}")) {
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throw new DnetCollectorException("Invalid date (YYYY-MM-DD): " + fromDate);
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}
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if (untilDate != null && !untilDate.matches("\\d{4}-\\d{2}-\\d{2}")) {
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throw new DnetCollectorException("Invalid date (YYYY-MM-DD): " + untilDate);
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}
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final Iterator<Iterator<String>> iters =
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sets.stream()
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.map(
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set ->
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getOaiIteratorFactory()
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.newIterator(
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baseUrl, mdFormat, set, fromDate,
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untilDate))
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.iterator();
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return StreamSupport.stream(
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Spliterators.spliteratorUnknownSize(Iterators.concat(iters), Spliterator.ORDERED),
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false);
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}
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public OaiIteratorFactory getOaiIteratorFactory() {
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if (oaiIteratorFactory == null) {
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oaiIteratorFactory = new OaiIteratorFactory();
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}
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return oaiIteratorFactory;
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}
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}
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