Revision 1388
Added by Jing Tao almost 22 years ago
| src/edu/ucsb/nceas/metacat/RelationHandler.java | ||
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| 30 | 30 |
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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/** |
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* Constructor for this class. finds all of the relations to a single xml |
| ... | ... | |
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{
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String packagetype = null; |
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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 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!");
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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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// 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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|
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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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if (hasmorerows) {
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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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MetaCatUtil.debugMessage("oringal subjectparentid: " +
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subjectParentId, 40); |
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MetaCatUtil.debugMessage("oringinal subject: "+subject);
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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); |
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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);
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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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"docid,packagetype,subject,subdoctype," + |
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"relationship, object, objdoctype) " + |
| ... | ... | |
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//increase usage count |
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connection.increaseUsageCount(1); |
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} |
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while(hasmorerows) {
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subject = rs.getString(1); |
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relationship = rs.getString(2); |
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object = rs.getString(3); |
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while (en.hasMoreElements()) |
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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(subject)).getIdentifier(); |
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object = (new DocumentIdentifier(object)).getIdentifier(); |
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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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//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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tstmt.setString(1, docid); |
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tstmt.setString(2, packagetype); |
| ... | ... | |
| 112 | 213 |
tstmt.setString(6, object); |
| 113 | 214 |
tstmt.setString(7, objDoctype); |
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tstmt.execute(); |
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hasmorerows = rs.next(); |
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} |
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if ( tstmt != null ) {
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tstmt.close(); |
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} |
| ... | ... | |
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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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*/ |
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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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/* |
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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. |
Also available in: Unified diff
Code to handle text node was splited.