org.opentripplanner.netex.loader.NetexXmlParser Maven / Gradle / Ivy

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package org.opentripplanner.netex.loader;

import org.rutebanken.netex.model.PublicationDeliveryStructure;

import javax.xml.bind.JAXBContext;
import javax.xml.bind.JAXBElement;
import javax.xml.bind.JAXBException;
import javax.xml.bind.Unmarshaller;
import java.io.InputStream;

/** Simple wrapper to perform typesafe xml parsing and simple error handling. */
public class NetexXmlParser {
    /** used to parse the XML. */
    private final Unmarshaller unmarshaller;

    public NetexXmlParser() {
        this.unmarshaller = createUnmarshaller();
    }

    /**
     * Parse an input stream and return the root document type for the given xml file (stream).
     */
    public PublicationDeliveryStructure parseXmlDoc(InputStream stream) throws JAXBException {
        JAXBElement root;

        //noinspection unchecked
        root = (JAXBElement) unmarshaller.unmarshal(stream);

        return root.getValue();
    }

    /** factory method for unmarshaller */
    private static Unmarshaller createUnmarshaller() {
        try {
            return JAXBContext
                    .newInstance(PublicationDeliveryStructure.class)
                    .createUnmarshaller();
        } catch (JAXBException e) {
            // This is a programming error - not expected!
            // We abort early and also allow for this to happen in the constructor;
            // Which in other cases would be considered bad practice.
            throw new RuntimeException(e);
        }
    }
}