86 lines
2.6 KiB
Java
86 lines
2.6 KiB
Java
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package eu.dnetlib.dhp.collection.plugin.base;
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import java.io.IOException;
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import java.io.StringWriter;
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import java.util.Iterator;
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import java.util.Optional;
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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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import org.apache.hadoop.fs.FileSystem;
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import org.apache.hadoop.fs.Path;
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import org.dom4j.Document;
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import org.dom4j.io.OutputFormat;
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import org.dom4j.io.XMLWriter;
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import org.slf4j.Logger;
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import org.slf4j.LoggerFactory;
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import eu.dnetlib.dhp.collection.ApiDescriptor;
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import eu.dnetlib.dhp.collection.plugin.CollectorPlugin;
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import eu.dnetlib.dhp.collection.plugin.file.AbstractSplittedRecordPlugin;
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import eu.dnetlib.dhp.common.aggregation.AggregatorReport;
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import eu.dnetlib.dhp.common.collection.CollectorException;
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public class BaseCollectorPlugin implements CollectorPlugin {
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private final FileSystem fs;
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private static final Logger log = LoggerFactory.getLogger(AbstractSplittedRecordPlugin.class);
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// MAPPING AND FILTERING ARE DEFINED HERE:
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// https://docs.google.com/document/d/1Aj-ZAV11b44MCrAAUCPiS2TUlXb6PnJEu1utCMAcCOU/edit
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public BaseCollectorPlugin(final FileSystem fs) {
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this.fs = fs;
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}
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@Override
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public Stream<String> collect(final ApiDescriptor api, final AggregatorReport report) throws CollectorException {
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// get path to file
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final Path filePath = Optional
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.ofNullable(api.getBaseUrl())
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.map(Path::new)
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.orElseThrow(() -> new CollectorException("missing baseUrl"));
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log.info("baseUrl: {}", filePath);
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try {
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if (!this.fs.exists(filePath)) {
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throw new CollectorException("path does not exist: " + filePath);
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}
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} catch (final Throwable e) {
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throw new CollectorException(e);
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}
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final Iterator<Document> iterator = new BaseCollectorIterator(this.fs, filePath, report);
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final Spliterator<Document> spliterator = Spliterators.spliteratorUnknownSize(iterator, Spliterator.ORDERED);
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return StreamSupport
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.stream(spliterator, false)
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.filter(doc -> filterXml(doc, report))
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.map(doc -> xmlToString(doc, report));
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}
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private boolean filterXml(final Document doc, final AggregatorReport report) {
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// TODO Auto-generated method stub
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// HERE THE FILTERS ACCORDING TO THE DOCUMENTATION
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return true;
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}
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private String xmlToString(final Document doc, final AggregatorReport report) {
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try (final StringWriter sw = new StringWriter()) {
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final XMLWriter writer = new XMLWriter(sw, OutputFormat.createPrettyPrint());
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writer.write(doc);
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return writer.toString();
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} catch (final IOException e) {
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report.put(e.getClass().getName(), e.getMessage());
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throw new RuntimeException("Error indenting XML record", e);
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}
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}
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}
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