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/**
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* '$Author$'
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* '$Date$'
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* '$Revision$'
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669
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jones
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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523
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berkley
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*/
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package edu.ucsb.nceas.metacat;
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import java.sql.*;
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import java.util.*;
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import java.lang.Thread;
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import java.net.*;
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public class RelationHandler implements Runnable
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{
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private Thread btThread = null;
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private Connection conn = null;
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private DocumentImpl xmldoc = null;
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MetaCatUtil util = new MetaCatUtil();
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/**
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* Constructor for this class. finds all of the relations to a single xml
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* document and writes them to the database. This includes transitive
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* relations.
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* @param xmldoc the xml document to index.
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*/
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public RelationHandler(DocumentImpl xmldoc, Connection conn)
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{
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//this.conn = conn;
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try
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{
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conn = MetacatReplication.getDBConnection("RelationHandler." +
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"relationHandler");
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}
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catch(Exception e)
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{
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MetaCatUtil.debugMessage("unable to get db connection in " +
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"relationhandler: " + e.getMessage());
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}
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this.xmldoc = xmldoc;
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if(xmldoc.getDoctype().equals(util.getOption("packagedoctype")))
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{ //make sure this doctype is a package document then run the thread
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btThread = new Thread(this);
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btThread.setPriority(Thread.MIN_PRIORITY);
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btThread.start();
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}
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}
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/**
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* The thread handler
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*/
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public void run()
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{
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MetaCatUtil.debugMessage("Running relation handler!");
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Connection dbconn = null;
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String docid = xmldoc.getDocID();
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String packagetype = xmldoc.getDoctype();
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// deletes all of the relations with a docid of @docid.
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deleteRelations(docid);
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//pseudo-code algorithm
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//for each new relation r in xml_nodes
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// put r into xml_relation
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// compare r to each relation already in xml_relation
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// if r isrelatedto a row in xml_relation
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// add a new row to xml_relation that represents this new relation
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try
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{
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dbconn = MetacatReplication.getDBConnection("RelationHandler." +
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"run");
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PreparedStatement pstmt = dbconn.prepareStatement(
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QuerySpecification.printPackageSQL(docid));
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pstmt.execute();
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//get the new relations out of xml_nodes
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ResultSet rs = pstmt.getResultSet();
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boolean hasmorerows = rs.next();
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while(hasmorerows)
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{
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String subject = rs.getString(1);
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String relationship = rs.getString(2);
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String object = rs.getString(3);
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String subjectDoctype = null;
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String paramDocid = null;
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URL subjectMurl = null;
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//get the current relations information
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String subDocid = null;
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String objDocid = null;
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String subDoctype = null;
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String objDoctype = null;
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try
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{
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URL subMurl = new URL(subject);
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if(subMurl.getQuery() != null)
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{
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Hashtable subMurlParams = util.parseQuery(subMurl.getQuery());
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subDocid = (String)subMurlParams.get("docid");
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if(subMurl.getProtocol().equals("metacat"))
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{
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DocumentImpl subDoc = new DocumentImpl(dbconn, subDocid);
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subDoctype = subDoc.getDoctype();
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}
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}
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else
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{
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subDocid = subject;
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}
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}
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catch(MalformedURLException murle)
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{ //assume this is just a docid not a url
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subDocid = subject;
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}
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try
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{
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URL objMurl = new URL(object);
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if(objMurl.getQuery() != null)
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{
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Hashtable objMurlParams = util.parseQuery(objMurl.getQuery());
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objDocid = (String)objMurlParams.get("docid");
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if(objMurl.getProtocol().equals("metacat"))
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{
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DocumentImpl objDoc = new DocumentImpl(dbconn, objDocid);
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objDoctype = objDoc.getDoctype();
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}
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}
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else
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{
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objDocid = object;
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}
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}
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catch(MalformedURLException murle)
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{ //assume this is just a docid
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objDocid = object;
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}
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//now that the comparisons are done, the new relation can be put
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//into xml_relation
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StringBuffer insertStmt = new StringBuffer();
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insertStmt.append("insert into xml_relation (docid, packagetype, ");
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insertStmt.append("subject, subdoctype, ");
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insertStmt.append("relationship, object, objdoctype) values ('");
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insertStmt.append(docid).append("', '");
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insertStmt.append(packagetype).append("', '");
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insertStmt.append(subject).append("', '");
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insertStmt.append(subDoctype).append("', '");
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insertStmt.append(relationship).append("', '");
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insertStmt.append(object).append("', '");
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insertStmt.append(objDoctype).append("')");
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pstmt = dbconn.prepareStatement(insertStmt.toString());
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pstmt.execute();
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hasmorerows = rs.next();
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}
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dbconn.commit();
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pstmt.close();
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dbconn.close();
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btThread = null;
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}
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catch(Exception e)
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{
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MetaCatUtil.debugMessage("Error in relationHandler.run: " +
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e.getMessage());
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btThread = null;
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try
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{
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conn.rollback();
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}
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catch (SQLException sqle) {}
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}
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}
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/**
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* Deletes all of the relations with a docid of 'docid'.
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* @param docid the docid to delete.
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*/
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public void deleteRelations(String docid)
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{
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Connection dbconn = null;
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try
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{
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dbconn = MetacatReplication.getDBConnection("RelationHandler."+
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"deleteRelations");
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}
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catch(Exception ee)
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{
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MetaCatUtil.debugMessage("error in relationHandler.deleteRelations: " +
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ee.getMessage());
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}
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try
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{
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PreparedStatement pstmt = dbconn.prepareStatement("delete from " +
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"xml_relation where docid like '" + docid + "'");
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pstmt.execute();
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pstmt.close();
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dbconn.close();
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}
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catch(Exception e)
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{
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MetaCatUtil.debugMessage("error in RelationHandler.deleteRelations(): " +
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e.getMessage());
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try
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{
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dbconn.rollback();
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dbconn.close();
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}
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catch (SQLException sqle) {}
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}
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}
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}
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