D-Net

package eu.dnetlib.index.solr.feed;

import java.text.ParseException;

import java.text.SimpleDateFormat;

import java.util.Arrays;

import java.util.Date;

import java.util.List;

import javax.xml.stream.XMLStreamException;

import org.apache.solr.common.SolrInputDocument;

import org.dom4j.DocumentException;

/**

 *

 * @author claudio

 *

 */

public abstract class InputDocumentFactory {

	public static final String INDEX_FIELD_PREFIX = "__";

	public static final String DS_VERSION = INDEX_FIELD_PREFIX + "dsversion";

	public static final String DS_ID = INDEX_FIELD_PREFIX + "dsid";

	public static final String RESULT = "result";

	public static final String INDEX_RESULT = INDEX_FIELD_PREFIX + RESULT;

	public static final String INDEX_RECORD_ID = INDEX_FIELD_PREFIX + "indexrecordidentifier";

	private static final String outFormat = new String("yyyy-MM-dd'T'hh:mm:ss'Z'");

	private final static List<String> dateFormats = Arrays.asList("yyyy-MM-dd'T'hh:mm:ss", "yyyy-MM-dd", "dd-MM-yyyy", "dd/MM/yyyy", "yyyy");

	public abstract SolrInputDocument parseDocument(final String version,

			final String inputDocument,

			final String dsId,

			final String resultName) throws XMLStreamException;

	public abstract SolrInputDocument parseDocument(final String version,

			final String inputDocument,

			final String dsId,

			final String resultName,

			final ResultTransformer resultTransformer) throws XMLStreamException;

	/**

	 * method return a solr-compatible string representation of a date

	 *

	 * @param date

	 * @return the parsed date

	 * @throws DocumentException

	 * @throws ParseException

	 */

	public static String getParsedDateField(final String date) {

		return new SimpleDateFormat(outFormat).format(tryParse(date));

	}

	public static Date tryParse(final String date) {

		for (String formatString : dateFormats) {

			try {

				return new SimpleDateFormat(formatString).parse(date);

			} catch (ParseException e) {}

		}

		throw new IllegalStateException("unable to parse date: " + date);

	}

	public String parseDate(final String date) {

		return getParsedDateField(date);

	}

}