Revision 1592
Added by Jing Tao about 21 years ago
| src/edu/ucsb/nceas/metacat/RelationHandler.java | ||
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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 DBConnection connection = null; |
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private String docid = null; |
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MetaCatUtil util = new MetaCatUtil(); |
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// The hashtable's key is String vector, subject parentid , relation ship |
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// prarent id and object parent id. Element is a vetor too. subject, relation |
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// and object |
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private Hashtable parentNodeIdList = new Hashtable(); |
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private static final int SUBJECTINDEX = 0; |
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private static final int RELATIONINDEX = 1; |
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private static final int OBJECTINDEX = 2; |
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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, DBConnection conn) |
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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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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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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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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 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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PreparedStatement tstmt = null; // to insert each relation into xml_relation |
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MetaCatUtil.debugMessage("Running relation handler!", 40);
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/* |
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* PSEUDO-CODE ALGORITHM: |
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* deletes all of the relations with a docid of @docid. |
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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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*/ |
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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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//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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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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| ... | ... | |
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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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// go through tripe list |
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for (int i= 0; i<tripleList.size(); i++) |
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{
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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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// 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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relationship = triple.getRelationship(); |
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object = (new DocumentIdentifier(triple.getObject())).getIdentifier(); |
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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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//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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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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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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tstmt.setString(7, objDoctype); |
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tstmt.execute(); |
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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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}//for |
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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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| ... | ... | |
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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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*/ |
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public boolean hasSameId(String parentId) |
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{
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boolean hasSame = false; |
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if (parentId == null || parentId.equals(""))
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{
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return hasSame; |
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} |
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Enumeration en = parentNodeIdList.keys(); |
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// go throught hashtable |
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while (en.hasMoreElements()) |
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{
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Vector keys = (Vector)en.nextElement(); |
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for (int i=0; i<keys.size(); i++) |
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{
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String obj = (String)keys.elementAt(i); |
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if ( obj != null && obj.equals(parentId) ) |
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{
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hasSame = true; |
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}//if |
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}//for |
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}//while |
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return hasSame; |
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} |
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/* |
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* Get a value from parentidlist for a given paretnIdlist |
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*/ |
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public String getValueFromParentIdList(String parentId) |
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{
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String value = null; |
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int index = -1; // index in vector keys which has same parentid to |
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// given id |
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// Check the parameter |
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if ( parentId == null || parentId.equals("") )
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{
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return value; |
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} |
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Enumeration en = parentNodeIdList.keys(); |
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// go throught hashtable |
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while (en.hasMoreElements()) |
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{
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Vector keys = (Vector)en.nextElement(); |
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for (int i=0; i<keys.size(); i++) |
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{
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String obj = (String)keys.elementAt(i); |
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if ( obj != null && obj.equals(parentId) ) |
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{
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index = i; |
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}//if |
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if (index != -1) |
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{
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// get the element vector to the key |
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Vector element = (Vector)parentNodeIdList.get(keys); |
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// get string |
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value = (String)element.elementAt(index); |
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} |
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// reset index |
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index = -1; |
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}//for |
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}//while |
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MetaCatUtil.debugMessage("The value for given parent id " + parentId +
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"is " + value, 40); |
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return value; |
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} |
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/* |
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* A method to remove a entry in hashtable for given parentid |
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*/ |
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private void removeEntryFromParentIdList(String parentId) |
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{
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if (parentId==null || parentId.equals(""))
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{
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return; |
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} |
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Enumeration en = parentNodeIdList.keys(); |
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// go throught hashtable |
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while (en.hasMoreElements()) |
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{
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Vector keys = (Vector)en.nextElement(); |
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for (int i=0; i<keys.size(); i++) |
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{
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String obj = (String)keys.elementAt(i); |
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if ( obj != null && obj.equals(parentId) ) |
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{
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parentNodeIdList.remove(keys); |
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}//if |
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}//for |
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}//while |
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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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* @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 String getAccessFileID(String docid) throws SQLException |
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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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sql.append("))");
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//System.out.println("new sql script: " + sql.toString());
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/* |
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PreparedStatement pstmt = |
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conn.prepareStatement("SELECT docid FROM xml_documents " +
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"WHERE docid in " + |
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"(SELECT subject FROM xml_relation " + |
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"WHERE docid = ?) " + |
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"AND doctype = ?"); |
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pstmt.setString(1, docid); |
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pstmt.setString(2, MetaCatUtil.getOption("accessdoctype"));
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*/ |
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try |
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{
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dbConn=DBConnectionPool. |
Also available in: Unified diff
This class will write triple to db.