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/**
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* '$Author: tao $'
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* '$Date: 2003-04-26 15:19:22 -0700 (Sat, 26 Apr 2003) $'
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* '$Revision: 1619 $'
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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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*/
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package edu.ucsb.nceas.metacat;
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import edu.ucsb.nceas.morpho.datapackage.Triple;
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import edu.ucsb.nceas.morpho.datapackage.TripleCollection;
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import java.io.StringReader;
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import java.sql.*;
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import java.util.*;
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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 DBConnection connection = null;
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private String docid = null;
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private String docType = null;
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TripleCollection tripleForPackage = null;
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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 docid the ID of the XML document to index.
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* @param doctype the doctype of this document
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* @param conn the db connection
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* @param list the triple list
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*/
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public RelationHandler(String docid, String doctype,
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DBConnection conn, TripleCollection list)
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throws McdbException, SQLException, AccessionNumberException
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{
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this.connection = conn;
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this.docid = docid;
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this.docType = doctype;
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tripleForPackage = list;
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createRelations();
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}
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/**
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* insert the relations specified in the triples into xml_relation table
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*/
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private void createRelations()
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throws McdbException, SQLException, AccessionNumberException
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{
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String packagetype = docType;
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String subject = null;
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String subjectParentId = null;
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String subDoctype = null;
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String relationship = null;
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String relationshipParentId = null;
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String object = null;
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String objDoctype = null;
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PreparedStatement tstmt = null; // to insert each relation into xml_relation
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MetaCatUtil.debugMessage("Running relation handler!", 40);
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// first delete the relations for this package document if any
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deleteRelations(docid);
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//get the vetor of triples
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Vector tripleList= new Vector();
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//get vector form tripleCollection
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if (tripleForPackage != null)
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{
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tripleList =tripleForPackage.getCollection();
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}
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if (tripleList != null && tripleList.size()>0)
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{
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tstmt = connection.prepareStatement("INSERT INTO xml_relation (" +
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"docid,packagetype,subject,subdoctype," +
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"relationship, object, objdoctype) " +
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"VALUES (?, ?, ?, ?, ?, ?, ?)");
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// go through tripe list
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for (int i= 0; i<tripleList.size(); i++)
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{
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//increase usage count
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connection.increaseUsageCount(1);
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// Get the triple
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Triple triple = (Triple)tripleList.elementAt(i);
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MetaCatUtil.debugMessage("Info from triple: ", 30);
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MetaCatUtil.debugMessage("subject from triple:"+triple.getSubject(), 30);
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MetaCatUtil.debugMessage("relationship from triple:"+triple.getRelationship(),30);
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MetaCatUtil.debugMessage("object from triple: "+triple.getObject(),30);
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//subject = (new DocumentIdentifier(triple.getSubject())).getIdentifier();
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subject = MetaCatUtil.getDocIdFromString(triple.getSubject());
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relationship = triple.getRelationship();
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//object = (new DocumentIdentifier(triple.getObject())).getIdentifier();
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object = MetaCatUtil.getDocIdFromString(triple.getObject());
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if (subject != null && relationship != null && object != null)
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{
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//put the new relation into xml_relation
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MetaCatUtil.debugMessage("Insert into xml_relation table", 30);
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tstmt.setString(1, docid);
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MetaCatUtil.debugMessage("Insert docid into xml_relation table" +
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docid, 30);
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tstmt.setString(2, packagetype);
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tstmt.setString(3, subject);
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MetaCatUtil.debugMessage("Insert subject into xml_relation table" +
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subject, 30);
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tstmt.setString(4, subDoctype);
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tstmt.setString(5, relationship);
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MetaCatUtil.debugMessage("Insert relationship into xml_relation table" +
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relationship, 30);
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tstmt.setString(6, object);
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MetaCatUtil.debugMessage("Insert object into xml_relation table" +
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object, 30);
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tstmt.setString(7, objDoctype);
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tstmt.execute();
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}//if
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}//for
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}//if
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if ( tstmt != null )
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{
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tstmt.close();
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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 of the package which relations to delete.
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*/
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public void deleteRelations(String docid) throws SQLException
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{
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try {
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PreparedStatement pstmt = connection.prepareStatement(
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"DELETE FROM xml_relation " +
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"WHERE docid = '" + docid + "'");
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//increase usage count
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connection.increaseUsageCount(1);
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pstmt.execute();
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pstmt.close();
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} catch(SQLException e) {
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MetaCatUtil.debugMessage("error in RelationHandler.deleteRelations(): " +
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e.getMessage(), 30);
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throw e;
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}
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}
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/**
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* Get the access file id for a package
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* @param docid the document identifier of the package
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* @return the document identifier of the access file for that package
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*/
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public static String getAccessFileID(String docid) throws SQLException
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{
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String aclid = null;
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PreparedStatement pstmt = null;
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DBConnection dbConn = null;
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int serialNumber = -1;
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StringBuffer sql = new StringBuffer();
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sql.append("SELECT docid FROM xml_documents WHERE docid in (SELECT subject ");
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sql.append("FROM xml_relation WHERE docid='").append(docid);
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sql.append("' AND (");
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Vector accessdoctypes = MetaCatUtil.getOptionList(
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MetaCatUtil.getOption("accessdoctype"));
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for(int i=0; i<accessdoctypes.size(); i++)
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{
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String atype = (String)accessdoctypes.elementAt(i);
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sql.append("doctype='").append(atype).append("'");
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if(i < accessdoctypes.size()-1)
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{
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sql.append(" OR ");
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}
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}
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sql.append("))");
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//System.out.println("new sql script: " + sql.toString());
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try
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{
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dbConn=DBConnectionPool.
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getDBConnection("RelationHandler.getAccessFileID");
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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 hasRow = rs.next();
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if (hasRow) {
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aclid = rs.getString(1);
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}
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pstmt.close();
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}//try
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finally
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{
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try
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{
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pstmt.close();
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}//try
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finally
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{
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DBConnectionPool.returnDBConnection(dbConn, serialNumber);
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}//finally
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}//finally
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MetaCatUtil.debugMessage("The access docid get from xml_relation is: "+
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aclid, 30);
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return aclid;
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}
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}
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