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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 org.dspace.content.crosswalk;

import java.io.IOException;
import java.sql.SQLException;
import java.util.List;

import org.dspace.authorize.AuthorizeException;
import org.dspace.content.DSpaceObject;
import org.dspace.content.Item;
import org.dspace.content.MetadataField;
import org.dspace.content.factory.ContentServiceFactory;
import org.dspace.content.service.ItemService;
import org.dspace.core.Constants;
import org.dspace.core.Context;
import org.jdom2.Element;
import org.jdom2.Namespace;

/**
 * DIM ingestion crosswalk
 * 
 * Processes metadata encoded in DSpace Intermediate Format, without the overhead of XSLT processing.
 *
 * @author Alexey Maslov
 * @version $Revision: 1 $
 */
public class DIMIngestionCrosswalk implements IngestionCrosswalk {
    private static final Namespace DIM_NS = Namespace.getNamespace("http://www.dspace.org/xmlns/dspace/dim");
    protected ItemService itemService = ContentServiceFactory.getInstance().getItemService();
    private CrosswalkMetadataValidator metadataValidator = new CrosswalkMetadataValidator();

    @Override
    public void ingest(Context context, DSpaceObject dso, List metadata, boolean createMissingMetadataFields)
        throws CrosswalkException, IOException, SQLException, AuthorizeException {
        Element first = metadata.get(0);
        if (first.getName().equals("dim") && metadata.size() == 1) {
            ingest(context, dso, first, createMissingMetadataFields);
        } else if (first.getName().equals("field") && first.getParentElement() != null) {
            ingest(context, dso, first.getParentElement(), createMissingMetadataFields);
        } else {
            Element wrapper = new Element("wrap", metadata.get(0).getNamespace());
            wrapper.addContent(metadata);
            ingest(context, dso, wrapper, createMissingMetadataFields);
        }
    }

    @Override
    public void ingest(Context context, DSpaceObject dso, Element root, boolean createMissingMetadataFields)
        throws CrosswalkException, IOException, SQLException, AuthorizeException {
        if (dso.getType() != Constants.ITEM) {
            throw new CrosswalkObjectNotSupported("DIMIngestionCrosswalk can only crosswalk an Item.");
        }
        Item item = (Item) dso;

        if (root == null) {
            System.err.println("The element received by ingest was null");
            return;
        }

        List metadata = root.getChildren("field", DIM_NS);
        for (Element field : metadata) {
            String schema = field.getAttributeValue("mdschema");
            String element = field.getAttributeValue("element");
            String qualifier = field.getAttributeValue("qualifier");
            MetadataField metadataField = metadataValidator
                .checkMetadata(context, schema, element, qualifier, createMissingMetadataFields);
            itemService.addMetadata(context, item, metadataField,
                                    field.getAttributeValue("lang"), field.getText());
        }

    }

}