Revision 1577
Added by Jing Tao about 21 years ago
| RelationHandler.java | ||
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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 Thread btThread = null; |
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public RelationHandler(String docid, DBConnection conn) |
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throws McdbException, SQLException, AccessionNumberException |
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{
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System.out.println("docid is: "+docid);
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this.connection = conn; |
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this.docid = docid; |
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putRelations(); |
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//putRelations(); |
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createRelations(); |
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} |
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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 putRelations()
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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 = 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 objectParentId = null; |
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String objDoctype = null; |
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PreparedStatement pstmt = null; // to get the relations from xml_nodes |
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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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* put r into xml_relation |
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*/ |
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//DocumentImpl xmldoc = new DocumentImpl(conn,docid,false);
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DocumentImpl xmldoc = new DocumentImpl(docid,true);
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packagetype = (new DocumentImpl(docid,false)).getDoctype(); |
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// first delete the relations for this package document if any |
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deleteRelations(docid); |
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// to put the new relations get them out of xml_nodes |
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pstmt = connection.prepareStatement |
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(QuerySpecification.printPackageSQL(docid)); |
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//increase usage cont |
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connection.increaseUsageCount(1); |
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pstmt.execute(); |
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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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Vector parentId = new Vector(); |
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Vector sbjReObj = new Vector(); |
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boolean mergeSubject = false; |
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boolean mergeRelation = false; |
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boolean mergerObject = false; |
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subject = rs.getString(1); |
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subjectParentId = rs.getString(2); |
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relationship = rs.getString(3); |
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relationshipParentId = rs.getString(4); |
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object = rs.getString(5); |
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objectParentId = rs.getString(6); |
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//transfer to documentImpl object to string |
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String xml = xmldoc.toString(); |
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//create a tripcollection object |
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TripleCollection tripleForPackage = new |
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TripleCollection(new StringReader(xml)); |
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//get the vetor of triples |
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Vector tripleList=tripleForPackage.getCollection(); |
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if (tripleList != null && tripleList.size()>0) |
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{
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MetaCatUtil.debugMessage("oringal subjectparentid: " +
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subjectParentId, 40); |
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MetaCatUtil.debugMessage("oringinal subject: "+subject, 40);
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MetaCatUtil.debugMessage("oringal relation parentid: "+
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relationshipParentId, 40); |
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MetaCatUtil.debugMessage("oringinal relationship: "+relationship, 40);
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MetaCatUtil.debugMessage("oringal objectparentid: "+
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objectParentId, 40); |
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MetaCatUtil.debugMessage("oringinal object: "+object, 40);
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if ( hasSameId(subjectParentId) ) |
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{
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// subject was splited and need to conbined |
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String prefixSubject = getValueFromParentIdList(subjectParentId); |
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if (prefixSubject !=null && !prefixSubject.equals(subject)) |
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{
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MetaCatUtil.debugMessage("merger subject: "+prefixSubject +
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subject, 40); |
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subject = prefixSubject + subject; |
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mergeSubject = true; |
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} |
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} |
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if ( hasSameId(relationshipParentId) ) |
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{
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// relationship need to be combined |
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String relationPrefix = getValueFromParentIdList(relationshipParentId); |
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if (relationPrefix != null && !relationPrefix.equals(relationship)) |
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{
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MetaCatUtil.debugMessage("merge relation: "+ relationPrefix +
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relationship, 40); |
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relationship = relationPrefix + relationship; |
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mergeRelation = true; |
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} |
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} |
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if ( hasSameId(objectParentId) ) |
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{
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String objectPrefix = getValueFromParentIdList(objectParentId); |
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if (objectPrefix != null && !objectPrefix.equals(object)) |
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{
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MetaCatUtil.debugMessage("merge object: "+ objectPrefix + object, 40);
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object = objectPrefix + object; |
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mergerObject = true; |
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} |
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} |
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if (mergeSubject) |
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{
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removeEntryFromParentIdList(subjectParentId); |
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} |
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if (mergeRelation) |
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{
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removeEntryFromParentIdList(relationshipParentId); |
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} |
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if (mergerObject) |
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{
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removeEntryFromParentIdList(objectParentId); |
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} |
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// Store the parentids into parentId vector |
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parentId.addElement(subjectParentId); |
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parentId.addElement(relationshipParentId); |
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parentId.addElement(objectParentId); |
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// Store the value into sbjRelObj vector |
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sbjReObj.addElement(subject); |
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sbjReObj.addElement(relationship); |
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sbjReObj.addElement(object); |
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// Store the parent id and value into hashtable |
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parentNodeIdList.put(parentId, sbjReObj); |
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hasmorerows = rs.next(); |
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} |
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Enumeration en = parentNodeIdList.elements(); |
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if (en.hasMoreElements()) {
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tstmt = connection.prepareStatement("INSERT INTO xml_relation (" +
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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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//increase usage count |
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connection.increaseUsageCount(1); |
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} |
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while (en.hasMoreElements())
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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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Vector values = (Vector)en.nextElement(); |
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// cut out the revision number for subject and object |
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subject = (new DocumentIdentifier((String)values.elementAt(SUBJECTINDEX))) |
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.getIdentifier(); |
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relationship = (String)values.elementAt(RELATIONINDEX); |
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object = (new DocumentIdentifier((String)values.elementAt(OBJECTINDEX))) |
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.getIdentifier(); |
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// Get the triple |
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Triple triple = (Triple)tripleList.elementAt(i); |
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subject = (new DocumentIdentifier(triple.getSubject())).getIdentifier(); |
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relationship = triple.getRelationship(); |
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object = (new DocumentIdentifier(triple.getObject())).getIdentifier(); |
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//subDoctype and objDoctype are N/A |
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subDoctype = null; |
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objDoctype = null; |
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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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relationship, 30); |
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tstmt.setString(6, object); |
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tstmt.setString(7, objDoctype); |
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tstmt.execute(); |
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} |
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if ( tstmt != null ) {
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tstmt.execute(); |
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}//for |
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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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pstmt.close(); |
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connection.commit(); |
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} |
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/* |
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* A method to check if a parentid is already in the paretnIdlist |
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*/ |
Also available in: Unified diff
Using triple rather than query to get relation.