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package eu.dnetlib.data.mapreduce.hbase.dataexport;
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import com.google.gson.Gson;
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import eu.dnetlib.data.mapreduce.hbase.bulktag.ProtoMap;
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import org.apache.hadoop.io.Text;
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import org.apache.hadoop.mapreduce.Mapper;
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import org.dom4j.Document;
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import org.dom4j.io.SAXReader;
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import java.io.IOException;
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import java.io.StringReader;
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import java.time.Year;
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/**
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* Exports the result matching the criteria found in the configuration.
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*
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* @author claudio
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*/
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public class ExportFilteredResultMapper extends Mapper<Text, Text, Text, Text> {
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private final static String RESULT_TYPE_XPATH = "/*[local-name() ='record']/*[local-name() ='result']/*[local-name() ='metadata']/*[local-name() ='entity']/*[local-name() ='result']/*[local-name() ='resulttype']/@classid";
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private Text keyOut;
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private Text valueOut;
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private RecordFilter defaultFilter;
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private RecordFilter userFilter;
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@Override
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protected void setup(final Context context) throws IOException, InterruptedException {
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keyOut = new Text("");
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valueOut = new Text();
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defaultFilter = new RecordFilter(
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new Gson().fromJson(context.getConfiguration().get("filter.defaultcriteria", "{}"), ProtoMap.class),
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context.getConfiguration().get("filter.yearxpath"),
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0,
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Year.now().getValue());
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userFilter = new RecordFilter(
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new Gson().fromJson(context.getConfiguration().get("filter.criteria", "{}"), ProtoMap.class),
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context.getConfiguration().get("filter.yearxpath"),
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context.getConfiguration().getInt("filter.fromyear", 0),
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context.getConfiguration().getInt("filter.toyear", 0));
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}
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@Override
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protected void map(final Text keyIn, final Text value, final Context context) throws IOException, InterruptedException {
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try {
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final String record = value.toString();
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final Document doc = new SAXReader().read(new StringReader(record));
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if (defaultFilter.matches(doc, true)) {
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if (userFilter.matches(doc, false)) {
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keyOut.set(keyIn.toString());
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valueOut.set(value.toString());
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context.write(keyOut, valueOut);
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context.getCounter("filter", "matched criteria " +doc.valueOf(RESULT_TYPE_XPATH)).increment(1);
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} else {
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context.getCounter("filter", "filtered by criteria").increment(1);
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}
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} else {
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context.getCounter("filter", "filtered by default criteria").increment(1);
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}
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} catch (final Throwable e) {
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context.getCounter("error", e.getClass().getName()).increment(1);
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throw new RuntimeException(e);
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}
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}
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}
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