Metacat

/**

 *  '$RCSfile$'

 *    Purpose: A Class for upgrading the database to version 1.5

 *  Copyright: 2000 Regents of the University of California and the

 *             National Center for Ecological Analysis and Synthesis

 *    Authors: Saurabh Garg

 *

 *   '$Author: leinfelder $'

 *     '$Date: 2013-09-13 15:53:44 -0700 (Fri, 13 Sep 2013) $'

 * '$Revision: 8200 $'

 *

 * This program is free software; you can redistribute it and/or modify

 * it under the terms of the GNU General Public License as published by

 * the Free Software Foundation; either version 2 of the License, or

 * (at your option) any later version.

 *

 * This program is distributed in the hope that it will be useful,

 * but WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

 * GNU General Public License for more details.

 *

 * You should have received a copy of the GNU General Public License

 * along with this program; if not, write to the Free Software

 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

 */

package edu.ucsb.nceas.metacat.dataone;

import java.io.File;

import java.io.IOException;

import java.io.InputStream;

import java.math.BigInteger;

import java.net.URL;

import java.net.URLConnection;

import java.security.NoSuchAlgorithmException;

import java.sql.SQLException;

import java.util.ArrayList;

import java.util.Collections;

import java.util.Date;

import java.util.HashMap;

import java.util.Hashtable;

import java.util.List;

import java.util.Map;

import java.util.Vector;

import javax.xml.parsers.ParserConfigurationException;

import javax.xml.xpath.XPathExpressionException;

import org.apache.commons.beanutils.BeanUtils;

import org.apache.commons.io.IOUtils;

import org.apache.log4j.Logger;

import org.apache.wicket.protocol.http.mock.MockHttpServletRequest;

import org.dataone.client.ObjectFormatCache;

import org.dataone.eml.DataoneEMLParser;

import org.dataone.eml.EMLDocument;

import org.dataone.eml.EMLDocument.DistributionMetadata;

import org.dataone.ore.ResourceMapFactory;

import org.dataone.service.exceptions.BaseException;

import org.dataone.service.exceptions.NotFound;

import org.dataone.service.types.v1.AccessPolicy;

import org.dataone.service.types.v1.AccessRule;

import org.dataone.service.types.v1.Checksum;

import org.dataone.service.types.v1.Identifier;

import org.dataone.service.types.v1.NodeReference;

import org.dataone.service.types.v1.ObjectFormatIdentifier;

import org.dataone.service.types.v1.ReplicationPolicy;

import org.dataone.service.types.v1.Session;

import org.dataone.service.types.v1.Subject;

import org.dataone.service.types.v1.SystemMetadata;

import org.dataone.service.types.v1.util.ChecksumUtil;

import org.dataone.service.util.DateTimeMarshaller;

import org.dspace.foresite.ResourceMap;

import org.jibx.runtime.JiBXException;

import org.xml.sax.SAXException;

import java.util.Calendar;

import edu.ucsb.nceas.metacat.AccessionNumber;

import edu.ucsb.nceas.metacat.AccessionNumberException;

import edu.ucsb.nceas.metacat.DBUtil;

import edu.ucsb.nceas.metacat.DocumentImpl;

import edu.ucsb.nceas.metacat.IdentifierManager;

import edu.ucsb.nceas.metacat.McdbDocNotFoundException;

import edu.ucsb.nceas.metacat.McdbException;

import edu.ucsb.nceas.metacat.MetaCatServlet;

import edu.ucsb.nceas.metacat.MetacatHandler;

import edu.ucsb.nceas.metacat.accesscontrol.AccessControlException;

import edu.ucsb.nceas.metacat.client.InsufficientKarmaException;

import edu.ucsb.nceas.metacat.dataone.hazelcast.HazelcastService;

import edu.ucsb.nceas.metacat.properties.PropertyService;

import edu.ucsb.nceas.metacat.replication.ReplicationService;

import edu.ucsb.nceas.metacat.shared.AccessException;

import edu.ucsb.nceas.metacat.shared.HandlerException;

import edu.ucsb.nceas.metacat.util.DocumentUtil;

import edu.ucsb.nceas.utilities.ParseLSIDException;

import edu.ucsb.nceas.utilities.PropertyNotFoundException;

public class SystemMetadataFactory {

	public static final String RESOURCE_MAP_PREFIX = "resourceMap_";

	private static Logger logMetacat = Logger.getLogger(SystemMetadataFactory.class);

	/**

	 * use this flag if you want to update any existing system metadata values with generated content

	 */

	private static boolean updateExisting = true;

	/**

	 * Creates a system metadata object for insertion into metacat

	 * 

	 * @param localId

	 *            The local document identifier

	 * @param user

	 *            The user submitting the system metadata document

	 * @param groups

	 *            The groups the user belongs to

	 * 

	 * @return sysMeta The system metadata object created

	 * @throws SAXException 

	 * @throws HandlerException 

	 * @throws AccessControlException 

	 * @throws AccessException 

	 */

	public static SystemMetadata createSystemMetadata(String localId, boolean includeORE, boolean downloadData)

			throws McdbException, McdbDocNotFoundException, SQLException,

			IOException, AccessionNumberException, ClassNotFoundException,

			InsufficientKarmaException, ParseLSIDException,

			PropertyNotFoundException, BaseException, NoSuchAlgorithmException,

			JiBXException, AccessControlException, HandlerException, SAXException, AccessException {

		logMetacat.debug("createSystemMetadata() called for localId " + localId);

		// check for system metadata

		SystemMetadata sysMeta = null;

		AccessionNumber accNum = new AccessionNumber(localId, "NONE");

		int rev = Integer.valueOf(accNum.getRev());

		// get/make the guid

		String guid = null;

		try {

			// get the guid if it exists

			guid = IdentifierManager.getInstance().getGUID(accNum.getDocid(), rev);

		} catch (McdbDocNotFoundException dnfe) {

			// otherwise create the mapping

			logMetacat.debug("No guid found in the identifier table.  Creating mapping for " + localId);

			IdentifierManager.getInstance().createMapping(localId, localId);

			guid = IdentifierManager.getInstance().getGUID(accNum.getDocid(), rev);			

		}

		// look up existing system metadata if it exists

		Identifier identifier = new Identifier();

		identifier.setValue(guid);

		try {

			logMetacat.debug("Using hazelcast to get system metadata");

			sysMeta = HazelcastService.getInstance().getSystemMetadataMap().get(identifier);

			// TODO: if this is the case, we could return here -- what else do we gain?

			if (!updateExisting ) {

				return sysMeta;

			}

		} catch (Exception e) {

			logMetacat.debug("No system metadata found in hz: " + e.getMessage());

		}

		if (sysMeta == null) {

			// create system metadata

			sysMeta = new SystemMetadata();

			sysMeta.setIdentifier(identifier);

			sysMeta.setSerialVersion(BigInteger.valueOf(1));

			sysMeta.setArchived(false);

		}

		// get additional docinfo

		Hashtable<String, String> docInfo = ReplicationService.getDocumentInfoMap(localId);

		// set the default object format

		String doctype = docInfo.get("doctype");

		ObjectFormatIdentifier fmtid = null;

		// set the object format, fall back to defaults

		if (doctype.trim().equals("BIN")) {

			// we don't know much about this file (yet)

			fmtid = ObjectFormatCache.getInstance().getFormat("application/octet-stream").getFormatId();

		} else if (doctype.trim().equals("metadata")) {

			// special ESRI FGDC format

			fmtid = ObjectFormatCache.getInstance().getFormat("FGDC-STD-001-1998").getFormatId();

		} else {

			try {

				// do we know the given format?

				fmtid = ObjectFormatCache.getInstance().getFormat(doctype).getFormatId();

			} catch (NotFound nfe) {

				// format is not registered, use default

				fmtid = ObjectFormatCache.getInstance().getFormat("text/plain").getFormatId();

			}

		}

		sysMeta.setFormatId(fmtid);

		logMetacat.debug("The ObjectFormat for " + localId + " is " + fmtid.getValue());

		// for retrieving the actual object

		InputStream inputStream = null;

		inputStream = MetacatHandler.read(localId);

		// create the checksum

		String algorithm = PropertyService.getProperty("dataone.checksumAlgorithm.default");

		Checksum checksum = ChecksumUtil.checksum(inputStream, algorithm);

		logMetacat.debug("The checksum for " + localId + " is " + checksum.getValue());

		sysMeta.setChecksum(checksum);

		// set the size from file on disk, don't read bytes again

		File fileOnDisk = getFileOnDisk(localId);

		long fileSize = 0;

		if (fileOnDisk.exists()) {

			fileSize = fileOnDisk.length();

		}

		sysMeta.setSize(BigInteger.valueOf(fileSize));

		// submitter

		Subject submitter = new Subject();

		submitter.setValue(docInfo.get("user_updated"));

		sysMeta.setSubmitter(submitter);

		// rights holder

		Subject owner = new Subject();

		owner.setValue(docInfo.get("user_owner"));

		sysMeta.setRightsHolder(owner);

		// dates

		String createdDateString = docInfo.get("date_created");

		String updatedDateString = docInfo.get("date_updated");

		Date createdDate = DateTimeMarshaller.deserializeDateToUTC(createdDateString);

		Date updatedDate = DateTimeMarshaller.deserializeDateToUTC(updatedDateString);  

		sysMeta.setDateUploaded(createdDate);

		//sysMeta.setDateSysMetadataModified(updatedDate);

		// use current datetime 

		sysMeta.setDateSysMetadataModified(Calendar.getInstance().getTime());

		// set the revision history

		String docidWithoutRev = accNum.getDocid();

		Identifier obsoletedBy = null;

		Identifier obsoletes = null;

		Vector<Integer> revisions = DBUtil.getRevListFromRevisionTable(docidWithoutRev);

		// ensure this ordering since processing depends on it

		Collections.sort(revisions);

		for (int existingRev: revisions) {

			// use the docid+rev as the guid

			String existingPid = docidWithoutRev + "." + existingRev;

			try {

				existingPid = IdentifierManager.getInstance().getGUID(docidWithoutRev, existingRev);

			} catch (McdbDocNotFoundException mdfe) {

				// we'll be defaulting to the local id

				logMetacat.warn("could not locate guid when processing revision history for localId: " + localId);

			}

			if (existingRev < rev) {

				// it's the old docid, until it's not

				obsoletes = new Identifier();

				obsoletes.setValue(existingPid);

			}

			if (existingRev > rev) {

				// it's the newer docid

				obsoletedBy = new Identifier();

				obsoletedBy.setValue(existingPid);

				// only want the version just after it

				break;

			}

		}

		// set them on our object

		sysMeta.setObsoletedBy(obsoletedBy);

		sysMeta.setObsoletes(obsoletes);

		// update the system metadata for the object[s] we are revising

		if (obsoletedBy != null) {

			SystemMetadata obsoletedBySysMeta = null;

			try {

				//obsoletedBySysMeta = HazelcastService.getInstance().getSystemMetadataMap().get(obsoletedBy);

				obsoletedBySysMeta = IdentifierManager.getInstance().getSystemMetadata(obsoletedBy.getValue());

			} catch (McdbDocNotFoundException e) {

				// ignore

			}

			if (obsoletedBySysMeta != null) {

				obsoletedBySysMeta.setObsoletes(identifier);

				obsoletedBySysMeta.setDateSysMetadataModified(Calendar.getInstance().getTime());

				HazelcastService.getInstance().getSystemMetadataMap().put(obsoletedBy, obsoletedBySysMeta);

			}

		}

		if (obsoletes != null) {

			SystemMetadata obsoletesSysMeta = null;

			try {

				//obsoletesSysMeta = HazelcastService.getInstance().getSystemMetadataMap().get(obsoletes);

				obsoletesSysMeta = IdentifierManager.getInstance().getSystemMetadata(obsoletes.getValue());

			} catch (McdbDocNotFoundException e) {

				// ignore

			}

			if (obsoletesSysMeta != null) {

				obsoletesSysMeta.setObsoletedBy(identifier);

				obsoletesSysMeta.setArchived(true);

				obsoletesSysMeta.setDateSysMetadataModified(Calendar.getInstance().getTime());

				HazelcastService.getInstance().getSystemMetadataMap().put(obsoletes, obsoletesSysMeta);

			}

		}

		// look up the access control policy we have in metacat

		AccessPolicy accessPolicy = IdentifierManager.getInstance().getAccessPolicy(guid);

		try {

        List<AccessRule> allowList = accessPolicy.getAllowList();

        int listSize = allowList.size();

        sysMeta.setAccessPolicy(accessPolicy);

    } catch (NullPointerException npe) {

        logMetacat.info("The allow list is empty, can't include an empty " +

            "access policy in the system metadata for " + guid);

    }

		// authoritative node

		NodeReference nr = new NodeReference();

		nr.setValue(PropertyService.getProperty("dataone.nodeId"));

		sysMeta.setOriginMemberNode(nr);

		sysMeta.setAuthoritativeMemberNode(nr);

		// Set a default replication policy

        ReplicationPolicy rp = getDefaultReplicationPolicy();

        if (rp != null) {

            sysMeta.setReplicationPolicy(rp);

        }

		// further parse EML documents to get data object format,

		// describes and describedBy information

		if (fmtid == ObjectFormatCache.getInstance().getFormat(

				"eml://ecoinformatics.org/eml-2.0.0").getFormatId()

				|| fmtid == ObjectFormatCache.getInstance().getFormat(

						"eml://ecoinformatics.org/eml-2.0.1").getFormatId()

				|| fmtid == ObjectFormatCache.getInstance().getFormat(

						"eml://ecoinformatics.org/eml-2.1.0").getFormatId()

				|| fmtid == ObjectFormatCache.getInstance().getFormat(

						"eml://ecoinformatics.org/eml-2.1.1").getFormatId()) {

			try {

				// get it again to parse the document

				logMetacat.debug("Re-reading document inputStream");

				inputStream = MetacatHandler.read(localId);

				DataoneEMLParser emlParser = DataoneEMLParser.getInstance();

		        EMLDocument emlDocument = emlParser.parseDocument(inputStream);

				// iterate through the data objects in the EML doc and add sysmeta

				logMetacat.debug("In createSystemMetadata() the number of data "

								+ "entities is: "

								+ emlDocument.distributionMetadata);

				// for generating the ORE map

	            Map<Identifier, List<Identifier>> idMap = new HashMap<Identifier, List<Identifier>>();

	            List<Identifier> dataIds = new ArrayList<Identifier>();

				// iterate through data objects described by the EML

	            if (emlDocument.distributionMetadata != null) {

					for (int j = 0; j < emlDocument.distributionMetadata.size(); j++) {

						DistributionMetadata distMetadata = emlDocument.distributionMetadata.elementAt(j);

				        String dataDocUrl = distMetadata.url;

				        String dataDocMimeType = distMetadata.mimeType;

						// default to binary

						if (dataDocMimeType == null) {

							dataDocMimeType = "application/octet-stream";

						}

						// process the data

						boolean remoteData = false;

						String dataDocLocalId = null;

						Identifier dataGuid = new Identifier();

						// handle ecogrid, or downloadable data

						String ecogridPrefix = "ecogrid://knb/";

						if (dataDocUrl.trim().startsWith(ecogridPrefix)) {

							dataDocLocalId = dataDocUrl.substring(dataDocUrl.indexOf(ecogridPrefix) + ecogridPrefix.length());

						} else {

							// should we try downloading the remote data?

							if (downloadData) {

								InputStream dataObject = null;

								try {

									// download the data from the URL

									URL dataURL = new URL(dataDocUrl);

									URLConnection dataConnection = dataURL.openConnection();

									// default is to download the data

									dataObject = dataConnection.getInputStream();

									String detectedContentType = dataConnection.getContentType();

									logMetacat.info("Detected content type: " + detectedContentType);

									if (detectedContentType != null) {

										// seems to be HTML from the remote location

										if (detectedContentType.contains("html")) {

											// if we are not expecting it, we skip it

											if (!dataDocMimeType.contains("html")) {

												// set to null so we don't download it

												dataObject = null;

												logMetacat.warn("Skipping remote resource, unexpected HTML content type at: " + dataDocUrl);

											}

										}

									} else {

										// if we don't know what it is, should we skip it?

										dataObject = null;

										logMetacat.warn("Skipping remote resource, unknown content type at: " + dataDocUrl);

									}

								} catch (Exception e) {

									// error with the download

									logMetacat.warn("Error downloading remote data. " + e.getMessage());

								}

								if (dataObject != null) {

									// create the local version of it

									dataDocLocalId = DocumentUtil.generateDocumentId(1);

									IdentifierManager.getInstance().createMapping(dataDocLocalId, dataDocLocalId);

									dataGuid.setValue(dataDocLocalId);

									// save it locally

									Session session = new Session();

									session.setSubject(submitter);

									MockHttpServletRequest request = new MockHttpServletRequest(null, null, null);

									MNodeService.getInstance(request).insertDataObject(dataObject, dataGuid, session);

									remoteData = true;

								}

							}

						}

						logMetacat.debug("Data local ID: " + dataDocLocalId);

						logMetacat.debug("Data URL     : " + dataDocUrl);

						logMetacat.debug("Data mime    : " + dataDocMimeType);

						// check for valid docid.rev

						String dataDocid = null;

						int dataRev = 0;

						if (dataDocLocalId != null) {

							// look up the guid for the data

							try {

								dataDocid = DocumentUtil.getSmartDocId(dataDocLocalId);

								dataRev = DocumentUtil.getRevisionFromAccessionNumber(dataDocLocalId);

							} catch (Exception e) {

								logMetacat.warn(e.getClass().getName() + " - Problem parsing accession number for: " + dataDocLocalId + ". Message: " + e.getMessage());

								dataDocLocalId = null;

							}

						}

						// now we have a local id for the data

						if (dataDocLocalId != null) {

							// check if data system metadata exists already

							SystemMetadata dataSysMeta = null;

							String dataGuidString = null;

							try {

								// look for the identifier

								dataGuidString = IdentifierManager.getInstance().getGUID(dataDocid, dataRev);

								// set it

								dataGuid.setValue(dataGuidString);

								// look up the system metadata

								try {

									dataSysMeta = HazelcastService.getInstance().getSystemMetadataMap().get(dataGuid);

								} catch (Exception e) {

									// probably not in the system

									dataSysMeta = null;

								}

								//dataSysMeta = IdentifierManager.getInstance().getSystemMetadata(dataGuidString);

							} catch (McdbDocNotFoundException nf) {

								// we didn't find it

								dataSysMeta = null;

							}

							// we'll have to generate it	

							if (dataSysMeta == null) {

								// System metadata for data doesn't exist yet, so create it

								logMetacat.debug("No exisiting SystemMetdata found, creating for: " + dataDocLocalId);

								dataSysMeta = createSystemMetadata(dataDocLocalId, includeORE, false);

								// now look it up again

								dataGuidString = IdentifierManager.getInstance().getGUID(dataDocid, dataRev);

								// set the guid

								dataGuid.setValue(dataGuidString);

								// inherit access rules from metadata, if we don't have our own

								if (remoteData) {

									dataSysMeta.setAccessPolicy(sysMeta.getAccessPolicy());

									// TODO: use access rules defined in EML, per data file

								}

							}

							// set object format for the data file

							logMetacat.debug("Updating system metadata for " + dataGuid.getValue() + " to " + dataDocMimeType);

							ObjectFormatIdentifier fmt = null;

							try {

								fmt = ObjectFormatCache.getInstance().getFormat(dataDocMimeType).getFormatId();

							} catch (NotFound nfe) {

								logMetacat.debug("Couldn't find format identifier for: "

												+ dataDocMimeType

												+ ". Setting it to application/octet-stream.");

								fmt = new ObjectFormatIdentifier();

								fmt.setValue("application/octet-stream");

							}

							dataSysMeta.setFormatId(fmt);

							// update the values

							HazelcastService.getInstance().getSystemMetadataMap().put(dataSysMeta.getIdentifier(), dataSysMeta);

							// include as part of the ORE package

							dataIds.add(dataGuid);

						} // end if (EML package)

					} // end for (data entities)

	            } // data entities not null

				// ORE map

				if (includeORE) {

					// can we generate them?

			        if (!dataIds.isEmpty()) {

			        	// it doesn't exist in the system?

			        	if (!oreExistsFor(sysMeta.getIdentifier())) {

				            // generate the ORE map for this datapackage

				            Identifier resourceMapId = new Identifier();

				            // use the local id, not the guid in case we have DOIs for them already

				            resourceMapId.setValue(RESOURCE_MAP_PREFIX + localId);

				            idMap.put(sysMeta.getIdentifier(), dataIds);

				            ResourceMap rm = ResourceMapFactory.getInstance().createResourceMap(resourceMapId, idMap);

				            String resourceMapXML = ResourceMapFactory.getInstance().serializeResourceMap(rm);

				            // copy most of the same system metadata as the packaging metadata

				            SystemMetadata resourceMapSysMeta = new SystemMetadata();

				            BeanUtils.copyProperties(resourceMapSysMeta, sysMeta);

				            resourceMapSysMeta.setIdentifier(resourceMapId);

				            Checksum oreChecksum = ChecksumUtil.checksum(IOUtils.toInputStream(resourceMapXML, MetaCatServlet.DEFAULT_ENCODING), algorithm);

							resourceMapSysMeta.setChecksum(oreChecksum);

				            ObjectFormatIdentifier formatId = ObjectFormatCache.getInstance().getFormat("http://www.openarchives.org/ore/terms").getFormatId();

							resourceMapSysMeta.setFormatId(formatId);

							resourceMapSysMeta.setSize(BigInteger.valueOf(sizeOfStream(IOUtils.toInputStream(resourceMapXML, MetaCatServlet.DEFAULT_ENCODING))));

							// set the revision graph

							resourceMapSysMeta.setObsoletes(null);

							resourceMapSysMeta.setObsoletedBy(null);

							// look up the resource map that this one obsoletes

							if (sysMeta.getObsoletes() != null) {

								// use the localId in case we have a DOI

								String obsoletesLocalId = IdentifierManager.getInstance().getLocalId(sysMeta.getObsoletes().getValue());

								Identifier resourceMapObsoletes = new Identifier();

								resourceMapObsoletes.setValue(RESOURCE_MAP_PREFIX + obsoletesLocalId );

								resourceMapSysMeta.setObsoletes(resourceMapObsoletes);

								SystemMetadata resourceMapObsoletesSystemMetadata = HazelcastService.getInstance().getSystemMetadataMap().get(resourceMapObsoletes);

								if (resourceMapObsoletesSystemMetadata != null) {

									resourceMapObsoletesSystemMetadata.setObsoletedBy(resourceMapId);

									resourceMapObsoletesSystemMetadata.setArchived(true);

									HazelcastService.getInstance().getSystemMetadataMap().put(resourceMapObsoletes, resourceMapObsoletesSystemMetadata);

								}

							}

							// look up the resource map that this one is obsoletedBy

							if (sysMeta.getObsoletedBy() != null) {

								// use the localId in case we have a DOI

								String obsoletedByLocalId = IdentifierManager.getInstance().getLocalId(sysMeta.getObsoletedBy().getValue());

								Identifier resourceMapObsoletedBy = new Identifier();

								resourceMapObsoletedBy.setValue(RESOURCE_MAP_PREFIX + obsoletedByLocalId);

								resourceMapSysMeta.setObsoletedBy(resourceMapObsoletedBy);

								resourceMapSysMeta.setArchived(true);

								SystemMetadata resourceMapObsoletedBySystemMetadata = HazelcastService.getInstance().getSystemMetadataMap().get(resourceMapObsoletedBy);

								if (resourceMapObsoletedBySystemMetadata != null) {

									resourceMapObsoletedBySystemMetadata.setObsoletes(resourceMapId);

									HazelcastService.getInstance().getSystemMetadataMap().put(resourceMapObsoletedBy, resourceMapObsoletedBySystemMetadata);

								}

							}

							// save it locally, if it doesn't already exist

							if (!IdentifierManager.getInstance().identifierExists(resourceMapId.getValue())) {

								Session session = new Session();

								session.setSubject(submitter);

								MockHttpServletRequest request = new MockHttpServletRequest(null, null, null);

								MNodeService.getInstance(request).insertDataObject(IOUtils.toInputStream(resourceMapXML, MetaCatServlet.DEFAULT_ENCODING), resourceMapId, session);

								MNodeService.getInstance(request).insertSystemMetadata(resourceMapSysMeta);

								logMetacat.info("Inserted ORE package: " + resourceMapId.getValue());

							}

			        	}

			        }

				}

			} catch (ParserConfigurationException pce) {

				logMetacat.debug("There was a problem parsing the EML document. "

								+ "The error message was: " + pce.getMessage());

			} catch (SAXException saxe) {

				logMetacat.debug("There was a problem traversing the EML document. "

								+ "The error message was: " + saxe.getMessage());

			} catch (XPathExpressionException xpee) {

				logMetacat.debug("There was a problem searching the EML document. "

								+ "The error message was: " + xpee.getMessage());

			} catch (Exception e) {

				logMetacat.debug("There was a problem creating System Metadata. "

								+ "The error message was: " + e.getMessage());

				e.printStackTrace();

			} // end try()

		} // end if()

		return sysMeta;

	}

	/**

	 * Checks for potential ORE object existence 

	 * @param identifier

	 * @return

	 */

    public static boolean oreExistsFor(Identifier identifier) {

    	MockHttpServletRequest request = new MockHttpServletRequest(null, null, null);

		List<Identifier> ids = MNodeService.getInstance(request).lookupOreFor(identifier, true);

		return (ids != null && ids.size() > 0);

	}

	/**

     * Generate SystemMetadata for any object in the object store that does

     * not already have it.  SystemMetadata documents themselves, are, of course,

     * exempt.  This is a utility method for migration of existing object 

     * stores to DataONE where SystemMetadata is required for all objects.

     * @param idList

     * @param includeOre

     * @param downloadData

     * @throws PropertyNotFoundException

     * @throws NoSuchAlgorithmException

     * @throws AccessionNumberException

     * @throws SQLException

	 * @throws SAXException 

	 * @throws HandlerException 

	 * @throws JiBXException 

	 * @throws BaseException 

	 * @throws ParseLSIDException 

	 * @throws InsufficientKarmaException 

	 * @throws ClassNotFoundException 

	 * @throws IOException 

	 * @throws McdbException 

	 * @throws AccessException 

	 * @throws AccessControlException 

     */

    public static void generateSystemMetadata(List<String> idList, boolean includeOre, boolean downloadData) 

    throws PropertyNotFoundException, NoSuchAlgorithmException, AccessionNumberException, SQLException, AccessControlException, AccessException, McdbException, IOException, ClassNotFoundException, InsufficientKarmaException, ParseLSIDException, BaseException, JiBXException, HandlerException, SAXException 

    {

        for (String localId : idList) { 

        	logMetacat.debug("Creating SystemMetadata for localId " + localId);

        	logMetacat.trace("METRICS:\tGENERATE_SYSTEM_METADATA:\tBEGIN:\tLOCALID:\t" + localId);

            SystemMetadata sm = null;

            //generate required system metadata fields from the document

            try {

            	sm = SystemMetadataFactory.createSystemMetadata(localId, includeOre, downloadData);

            } catch (Exception e) {

				logMetacat.error("Could not create/process system metadata for docid: " + localId, e);

				continue;

			}

            //insert the systemmetadata object or just update it as needed

        	IdentifierManager.getInstance().insertOrUpdateSystemMetadata(sm);

        	logMetacat.info("Generated or Updated SystemMetadata for " + localId);

        	logMetacat.trace("METRICS:\tGENERATE_SYSTEM_METADATA:\tEND:\tLOCALID:\t" + localId);

        }

        logMetacat.info("done generating system metadata for given list");

    }

	/**

	 * Find the size (in bytes) of a stream. Note: This needs to refactored out

	 * of MetacatHandler and into a utility when stream i/o in Metacat is

	 * evaluated.

	 * 

	 * @param is The InputStream of bytes

	 * 

	 * @return size The size in bytes of the input stream as a long

	 * 

	 * @throws IOException

	 */

	public static long sizeOfStream(InputStream is) throws IOException {

		long size = 0;

		byte[] b = new byte[1024];

		int numread = is.read(b, 0, 1024);

		while (numread != -1) {

			size += numread;

			numread = is.read(b, 0, 1024);

		}

		return size;

	}

	private static File getFileOnDisk(String docid) throws McdbException, PropertyNotFoundException {

		DocumentImpl doc = new DocumentImpl(docid, false);

		String filepath = null;

		String filename = null;

		// deal with data or metadata cases

		if (doc.getRootNodeID() == 0) {

			// this is a data file

			filepath = PropertyService.getProperty("application.datafilepath");

		} else {

			filepath = PropertyService.getProperty("application.documentfilepath");

		}

		// ensure it is a directory path

		if (!(filepath.endsWith("/"))) {

			filepath += "/";

		}

		filename = filepath + docid;

		File documentFile = new File(filename);

		return documentFile;

	}

	/**

	 * Create a default ReplicationPolicy by reading properties from metacat's configuration

	 * and using those defaults. If the numReplicas property is not found, malformed, or less

	 * than or equal to zero, no policy needs to be set, so return null.

	 * @return ReplicationPolicy, or null if no replication policy is needed

	 */

    private static ReplicationPolicy getDefaultReplicationPolicy() {

        ReplicationPolicy rp = null;

        int numReplicas = -1;

        try {

            numReplicas = new Integer(PropertyService.getProperty("dataone.replicationpolicy.default.numreplicas"));

        } catch (NumberFormatException e) {

            // The property is not a valid integer, so return a null policy

            return null;

        } catch (PropertyNotFoundException e) {

            // The property is not found, so return a null policy

            return null;

        }

        if (numReplicas > 0) {

            rp = new ReplicationPolicy();

            rp.setReplicationAllowed(true);

            rp.setNumberReplicas(numReplicas);

            try {

                String preferredNodeList = PropertyService.getProperty("dataone.replicationpolicy.default.preferredNodeList");

                if (preferredNodeList != null) {

                    List<NodeReference> pNodes = extractNodeReferences(preferredNodeList);

                    if (pNodes != null && !pNodes.isEmpty()) {

                        rp.setPreferredMemberNodeList(pNodes);

                    }

                }

            } catch (PropertyNotFoundException e) {

                // No preferred list found in properties, so just ignore it; no action needed

            }

            try {

                String blockedNodeList = PropertyService.getProperty("dataone.replicationpolicy.default.blockedNodeList");

                if (blockedNodeList != null) {

                    List<NodeReference> bNodes = extractNodeReferences(blockedNodeList);

                    if (bNodes != null && !bNodes.isEmpty()) {

                        rp.setBlockedMemberNodeList(bNodes);

                    }

                }

            } catch (PropertyNotFoundException e) {

                // No blocked list found in properties, so just ignore it; no action needed

            }

        }

        return rp;

    }

    /**

     * Extract a List of NodeReferences from a String listing the node identifiers where

     * each identifier is separated by whitespace, comma, or semicolon characters.

     * @param nodeString the string containing the list of nodes

     * @return the List of NodeReference objects parsed from the input string

     */

    private static List<NodeReference> extractNodeReferences(String nodeString) {

        List<NodeReference> nodeList = new ArrayList<NodeReference>();

        String[] result = nodeString.split("[,;\\s]");

        for (String r : result) {

        	if (r != null && r.length() > 0) {

	            NodeReference noderef = new NodeReference();

	            noderef.setValue(r);

	            nodeList.add(noderef);

	        }

        }

        return nodeList;

    }

}