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OAI-PMH service provider implementation. Use it as a harvesting client to read remote repositories.

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/*
 * The contents of this file are subject to the license and copyright
 * detailed in the LICENSE and NOTICE files at the root of the source
 * tree and available online at
 *
 * http://www.dspace.org/license/
 */

package io.gdcc.xoai.serviceprovider.parsers;

import static io.gdcc.xoai.model.oaipmh.results.record.Header.Status.DELETED;
import static io.gdcc.xoai.serviceprovider.xml.IslandParsers.dateParser;
import static io.gdcc.xoai.xmlio.matchers.AttributeMatchers.attributeName;
import static io.gdcc.xoai.xmlio.matchers.QNameMatchers.localPart;
import static io.gdcc.xoai.xmlio.matchers.XmlEventMatchers.aStartElement;
import static io.gdcc.xoai.xmlio.matchers.XmlEventMatchers.anEndElement;
import static io.gdcc.xoai.xmlio.matchers.XmlEventMatchers.elementName;
import static io.gdcc.xoai.xmlio.matchers.XmlEventMatchers.text;
import static org.hamcrest.CoreMatchers.equalTo;
import static org.hamcrest.core.AllOf.allOf;

import io.gdcc.xoai.model.oaipmh.results.record.Header;
import io.gdcc.xoai.xmlio.XmlReader;
import io.gdcc.xoai.xmlio.exceptions.XmlReaderException;
import javax.xml.stream.events.XMLEvent;
import org.hamcrest.Matcher;

public class HeaderParser {
    public Header parse(XmlReader reader) throws XmlReaderException {
        Header header = new Header();
        if (reader.hasAttribute(attributeName(localPart(equalTo("status")))))
            header.withStatus(DELETED);
        reader.next(elementName(localPart(equalTo("identifier")))).next(text());
        header.withIdentifier(reader.getText());
        reader.next(elementName(localPart(equalTo("datestamp")))).next(text());
        header.withDatestamp(reader.get(dateParser()));
        while (reader.next(endOfHeader(), setSpecElement()).current(setSpecElement()))
            header.withSetSpec(reader.next(text()).getText());
        return header;
    }

    private Matcher setSpecElement() {
        return allOf(aStartElement(), elementName(localPart(equalTo("setSpec"))));
    }

    private Matcher endOfHeader() {
        return allOf(anEndElement(), elementName(localPart(equalTo("header"))));
    }
}