D-Net

package eu.dnetlib.data.mdstore.modular.mongodb.utils;

import java.util.ArrayList;

import java.util.HashMap;

import java.util.List;

import java.util.Map;

import com.ximpleware.AutoPilot;

import com.ximpleware.VTDGen;

import com.ximpleware.VTDNav;

import eu.dnetlib.data.mdstore.modular.MDFormatDescription;

import org.apache.commons.logging.Log;

import org.apache.commons.logging.LogFactory;

/**

 * Created by sandro on 11/29/16.

 */

public class IndexFieldRecordParser {

    private static final Log log = LogFactory.getLog(IndexFieldRecordParser.class);

    private static List<String> getTextValue(final AutoPilot ap, final VTDNav vn, final String xpath) throws Exception {

        List<String> results = new ArrayList<>();

        ap.selectXPath(xpath);

        while (ap.evalXPath() != -1) {

            int t = vn.getText();

            if (t > -1) results.add(vn.toNormalizedString(t));

        }

        return results;

    }

    public Map<String, List<String>> parseRecord(final String record, final List<MDFormatDescription> mdformats) throws IndexFieldRecordParserException {

        if (mdformats == null || mdformats.size() == 0)

            return null;

        final Map<String, List<String>> result = new HashMap<>();

        try {

            final VTDGen vg = new VTDGen();

            vg.setDoc(record.getBytes());

            vg.parse(true);

            final VTDNav vn = vg.getNav();

            final AutoPilot ap = new AutoPilot(vn);

            for (MDFormatDescription description : mdformats) {

                List<String> xpathResult = getTextValue(ap, vn, description.getXpath());

                result.put(description.getName(), xpathResult);

            }

            return result;

        } catch (Throwable e) {

            throw new IndexFieldRecordParserException("Cannot index record", e);

        }

    }

}