uk.ac.ed.epcc.webapp.model.data

Class DiffParser

java.lang.Object

uk.ac.ed.epcc.webapp.AbstractContexed

uk.ac.ed.epcc.webapp.model.data.DumpParser

uk.ac.ed.epcc.webapp.model.data.DiffParser

All Implemented Interfaces:

org.xml.sax.ContentHandler, Contexed

public class DiffParser
extends DumpParser

A DumpParser parses a baseline dump of a database and compares it with the current database state via calls to Dumper#dumpDiff(Record, Record) on an enclosed Dumper. Records from the baseline will either be added to the dump as changes or marked as seen. The same Dumper can then be used to generate a full database dump adding and records added since the baseline.

The dump being compared against must be a newly generated dump from an earlier state of the same database as this code cannot work out the correct id to use if the record has changed and has to use the id from the parse.

Field Summary

Fields inherited from class uk.ac.ed.epcc.webapp.AbstractContexed

conn

Constructor Summary

Constructors

Constructor and Description
DiffParser(AppContext conn, Dumper dumper)

Method Summary

Modifier and Type	Method and Description
Dumper	getDumper()
protected Repository.IdMode	getIdMode()
int	processRecord(int parse_id, Repository.Record rec) handle a Repository.Record once we have parsed it
void	processSpecification(java.lang.String table, TableSpecification spec) handle a TableSpecification once we have parsed it.
boolean	skipSpecification(java.lang.String table) should we skip parsing the following TableSpecification.

Methods inherited from class uk.ac.ed.epcc.webapp.model.data.DumpParser

characters, endDocument, endElement, endPrefixMapping, getPreserveIds, ignorableWhitespace, processingInstruction, setDocumentLocator, setPreserveIds, skippedEntity, skipRecord, startDocument, startElement, startPrefixMapping

Methods inherited from class uk.ac.ed.epcc.webapp.AbstractContexed

getContext, getLogger, resetLogger

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

DiffParser

public DiffParser(AppContext conn,
                  Dumper dumper)

Parameters:

conn -

Method Detail

getDumper

public Dumper getDumper()

processRecord

public int processRecord(int parse_id,
                         Repository.Record rec)
                  throws ConsistencyError,
                         DataException,
                         java.io.IOException

Description copied from class: DumpParser

handle a Repository.Record once we have parsed it

Specified by:

processRecord in class DumpParser

Parameters:

parse_id - int id parsed from file.

rec - uncommitted Repository.Record parsed from the file

Returns:

int id to record in id_map.

Throws:

ConsistencyError

DataException

java.io.IOException

processSpecification

public void processSpecification(java.lang.String table,
                                 TableSpecification spec)
                          throws DataFault

Description copied from class: DumpParser

handle a TableSpecification once we have parsed it.

Specified by:

processSpecification in class DumpParser

Throws:

DataFault

skipSpecification

public boolean skipSpecification(java.lang.String table)

Description copied from class: DumpParser

should we skip parsing the following TableSpecification.

Specified by:

skipSpecification in class DumpParser

Returns:

boolean

getIdMode

protected Repository.IdMode getIdMode()

Overrides:

getIdMode in class DumpParser

Returns: