Revision 4672
Added by Jing Tao about 16 years ago
src/edu/ucsb/nceas/metacat/util/EMLVersionsTransformer.java | ||
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package edu.ucsb.nceas.metacat.util; |
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import java.io.*; |
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import java.sql.PreparedStatement; |
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import java.sql.ResultSet; |
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import java.sql.SQLException; |
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import java.util.Enumeration; |
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import java.util.Hashtable; |
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import java.util.Vector; |
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import org.apache.log4j.Logger; |
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import edu.ucsb.nceas.metacat.DBConnection; |
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import edu.ucsb.nceas.metacat.DBConnectionPool; |
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import edu.ucsb.nceas.metacat.DocumentImpl; |
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import edu.ucsb.nceas.metacat.DocumentImplWrapper; |
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import edu.ucsb.nceas.metacat.McdbException; |
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import edu.ucsb.nceas.metacat.service.PropertyService; |
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import javax.xml.transform.TransformerFactory; |
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import javax.xml.transform.Transformer; |
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import javax.xml.transform.stream.StreamSource; |
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import javax.xml.transform.TransformerException; |
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import javax.xml.transform.TransformerConfigurationException; |
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import javax.xml.transform.URIResolver; |
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import org.ecoinformatics.eml.EMLParser; |
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/** |
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* A Class that transforms older eml version to newer eml version utitlizing XSL style sheets. |
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*/ |
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public class EMLVersionsTransformer { |
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private static Logger logMetacat = Logger.getLogger(GeoserverUtil.class); |
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private static Logger logMetacat = Logger.getLogger(EMLVersionsTransformer.class); |
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private static String eml210StyleFile = null; |
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static{ |
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try |
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{ |
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eml210StyleFile =PropertyService.getProperty("application.deployDir")+"/"+PropertyService |
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.getProperty("application.context")+ "/style/common/eml201to210.xsl"; //eml201to210.xsl place |
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} |
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catch(Exception e) |
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{ |
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logMetacat.warn("Couldn't get eml201to210.xsl stylesheet"); |
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} |
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} |
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private static String DOT = "."; |
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/** |
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* Public constructor because all methods are static and do not need |
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* an instance. |
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*/ |
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private EMLVersionsTransformer()
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public EMLVersionsTransformer()
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{ |
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} |
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/** |
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* Method to upgrade old versions of eml to new version |
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*/ |
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public void upgrade() |
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{ |
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upgradeEML200ToEML210(); |
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} |
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/* |
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* Transform an XML document using an XSLT stylesheet to another format, |
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* probably HTML or another XML document format. |
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* |
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* @param docString the document to be transformed |
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* @param xslSystemId the system location of the stylesheet |
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* @param pw the PrintWriter to which output is printed |
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* @param params some parameters for inclusion to the transformation |
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* Upgrade every eml200 or eml210 documents into eml210 |
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*/ |
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private static void transform(String docString, String xslSystemId, |
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Writer pw, Hashtable param) throws Exception |
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private void upgradeEML200ToEML210() |
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{ |
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transform(new StringReader(docString), xslSystemId, pw, param); |
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Vector list = getEML2DocList(); |
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if(list != null) |
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{ |
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for(int i=0; i<list.size(); i++) |
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{ |
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OwnerAndDocid pair = (OwnerAndDocid)list.elementAt(i); |
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String docid = pair.getDocid(); |
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String owner = pair.getOwner(); |
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try |
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{ |
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handleSingleEML200Document(docid, owner); |
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} |
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catch(Exception e) |
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{ |
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logMetacat.warn("The docid "+docid+" with owner "+owner+" couldn't be transformed to eml-2.1.0 since "+e.getMessage()); |
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} |
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} |
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} |
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} |
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/* |
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* Handle single eml201 or eml 200 document: read the document, transform it to eml210 document |
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* then save it to 210 document into metacat |
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*/ |
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private void handleSingleEML200Document(String docidWithRev, String owner) throws Exception |
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{ |
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DocumentImpl docImpl = new DocumentImpl(docidWithRev); |
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String eml200Content = docImpl.toString(); |
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StringReader eml200Source= new StringReader(eml200Content); |
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//PipedWriter eml210OutputAfterTransform = new PipedWriter(); |
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//PipedReader eml210SourceForNewDoc = new PipedReader(); |
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//eml210SourceForNewDoc.connect(eml210OutputAfterTransform); |
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StringWriter strWriter = new StringWriter(); |
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String newId = increaseRevisionNumber(docidWithRev); |
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if(newId != null) |
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{ |
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transformEML200ToEML210(eml200Source, eml210StyleFile, strWriter, newId); |
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String eml210Content = ""; |
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strWriter.write(eml210Content); |
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String rule = DocumentImpl.EML210; |
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// using emlparser to check id validation |
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EMLParser parser = new EMLParser(eml210Content); |
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DocumentImplWrapper documentWrapper = new DocumentImplWrapper(rule, true); |
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StringReader xml = new StringReader(eml210Content); |
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String doAction = "UPDATE"; |
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String pub = null; |
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String []groups = null; |
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DBConnection dbconn = null; |
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StringReader dtd = null; |
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int serialNumber = -1; |
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try |
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{ |
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dbconn = DBConnectionPool |
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.getDBConnection("EMLVersionsTransformer.handleSingleEML200Document"); |
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serialNumber = dbconn.getCheckOutSerialNumber(); |
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documentWrapper.write(dbconn, xml, pub, dtd, |
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doAction, newId, owner, groups); |
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logMetacat.warn("Doc "+docidWithRev+"was transformed to eml210 with new id "+newId); |
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} |
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catch(Exception e) |
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{ |
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throw e; |
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} |
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finally |
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{ |
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// Return db connection |
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DBConnectionPool.returnDBConnection(dbconn, serialNumber); |
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} |
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} |
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else |
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{ |
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logMetacat.warn("Couldn't increase docid "+docidWithRev+"'s revision"); |
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} |
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} |
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/* |
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* Transform single eml201 (Reader) to eml 210 (Writer) |
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*/ |
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private static void transformEML200ToEML210(Reader reader, String xslfile, Writer writer, String packageid) throws Exception{ |
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Hashtable param = null; |
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if (packageid != null) |
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{ |
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param = new Hashtable(); |
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param.put("package-id", packageid); |
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} |
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EMLVersionsTransformer.transform(reader, xslfile, writer, param); |
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} |
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/* |
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* Transform an XML document using an XSLT stylesheet to another format, |
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* probably HTML or another XML document format. |
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* |
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transformer.transform(ss, sr); |
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} |
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/* |
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* Get list of document (docid and owner) which type is eml200 or eml201. |
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* The docid in the list will have revision number too. |
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*/ |
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private Vector getEML2DocList() |
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{ |
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Vector list = new Vector(); |
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DBConnection dbconn = null; |
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int serialNumber = -1; |
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String sql = "select docid, rev, user_owner from xml_documents where doctype like 'eml://ecoinformatics.org/eml-2.0.1' or doctype like 'eml://ecoinformatics.org/eml-2.0.0'"; |
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PreparedStatement pstmt = null; |
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try { |
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dbconn = DBConnectionPool |
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.getDBConnection("EMLVersionsTransformer.getEML2DocList"); |
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serialNumber = dbconn.getCheckOutSerialNumber(); |
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pstmt = dbconn.prepareStatement(sql.toString()); |
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pstmt.execute(); |
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ResultSet rs = pstmt.getResultSet(); |
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boolean tableHasRows = rs.next(); |
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if (tableHasRows) { |
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String docidWithoutRev = rs.getString(1); |
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int rev = rs.getInt(2); |
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String owner = rs.getString(3); |
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String docidWithRev = docidWithoutRev+DOT+rev; |
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logMetacat.info("The docid "+docidWithRev+" with owner "+owner+" will be added into list which will be transformed to eml-2.1.0"); |
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OwnerAndDocid pair = new OwnerAndDocid(owner, docidWithRev);; |
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list.add(pair); |
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tableHasRows = rs.next(); |
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} |
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pstmt.close(); |
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} catch (SQLException e) { |
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logMetacat.error("error in DocumentImpl.getDocumentInfo: " |
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+ e.getMessage()); |
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e.printStackTrace(System.out); |
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} finally { |
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try { |
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pstmt.close(); |
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} catch (SQLException ee) { |
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logMetacat.error( |
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"error in DocumentImple.getDocumentInfo: " |
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+ ee.getMessage()); |
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} finally { |
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DBConnectionPool.returnDBConnection(dbconn, serialNumber); |
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} |
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} |
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return list; |
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} |
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/* |
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* Transform single eml201 doc to eml 210 doc |
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* Increase revision number for the given docid. tao.1.1 will be tao.1.2. null will be returned |
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* if couldn't increase it. |
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*/ |
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private static void transformEML201ToEML210(Reader reader, String xslfile, Writer writer, String packageid) throws Exception{ |
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Hashtable param = null; |
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if (packageid != null) |
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{ |
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param = new Hashtable(); |
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param.put("package-id", packageid); |
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} |
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EMLVersionsTransformer.transform(reader, xslfile, writer, param); |
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} |
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private static String increaseRevisionNumber(String docidWithRev) |
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{ |
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String newid = null; |
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try |
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{ |
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if (docidWithRev != null) |
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{ |
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int index = docidWithRev.lastIndexOf(DOT); |
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if (index != -1) |
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{ |
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String firstTwoParts = docidWithRev.substring(0,index); |
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String revStr = docidWithRev.substring(index+1); |
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Integer revObj = new Integer(revStr); |
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int rev = revObj.intValue(); |
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rev= rev+1; |
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newid = firstTwoParts+DOT+rev; |
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} |
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} |
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} |
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catch(Exception e) |
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{ |
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logMetacat.warn("Couldn't increase revision number since "+e.getMessage()); |
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} |
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return newid; |
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} |
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/* |
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* Class reprents a document's docid and its owner |
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* @author tao |
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* |
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*/ |
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class OwnerAndDocid{ |
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private String owner = null; |
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private String docidWithRev = null; |
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public OwnerAndDocid(String owner, String docidWithRev) |
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{ |
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this.owner = owner; |
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this.docidWithRev = docidWithRev; |
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} |
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public String getOwner() |
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{ |
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return owner; |
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} |
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public String getDocid() |
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{ |
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return docidWithRev; |
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} |
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} |
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} |
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Also available in: Unified diff
Add code to go through eml201 document list to transform them to eml210.