apollo.dataadapter.das.simple
Class DASFeatureContentHandler

java.lang.Object
  org.xml.sax.helpers.DefaultHandler
      apollo.dataadapter.das.simple.DASFeatureContentHandler

All Implemented Interfaces:

org.xml.sax.ContentHandler, org.xml.sax.DTDHandler, org.xml.sax.EntityResolver, org.xml.sax.ErrorHandler

public class DASFeatureContentHandler
extends org.xml.sax.helpers.DefaultHandler

I am the ContentHandler used when SimpleDASServer parses the result of a 'features' call to a das data source (with a specified dsn and segment).

I am DAS 1.0 compliant.

During the parse, I create a list, stored on myself, of the returned features. This list is retrieved by calling getFeaturess after the parse is complete

If any of the features retrieved during my run contain subparts or are reference features (have children), then I store them away. When I am done with my parse, I re-invoke the SimpleDASServer with another getFeatures call, passing in all the segments that have children. which creates another instance of me(!) and starts a another parse of the child-features. This is how I assemble all features for a given parent.

Author:

Vivek Iyer

See Also:

SimpleDASServer.getEntryPoints(apollo.dataadapter.das.DASDsn)

Field Summary

DASDsn	dsn
java.util.HashMap	parentFeatures
java.util.HashMap	parentFeaturesOfSegmentsToBeRequested
java.util.HashMap	segments
java.util.HashMap	segmentsToBeRequested
DASServerI	server

Constructor Summary

DASFeatureContentHandler()

DASFeatureContentHandler(DASServerI theServer, DASDsn theDsn, java.util.HashMap theSegments, java.util.HashMap theParentFeatures, long theGlobalStart, long theGlobalEnd)

Method Summary

void	characters(char[] text, int start, int length)
void	endElement(java.lang.String namespaceURI, java.lang.String localName, java.lang.String qualifiedName)
java.util.List	getFeatures()
void	startElement(java.lang.String namespaceURI, java.lang.String localName, java.lang.String qualifiedName, org.xml.sax.Attributes attributes)

Methods inherited from class org.xml.sax.helpers.DefaultHandler

endDocument, endPrefixMapping, error, fatalError, ignorableWhitespace, notationDecl, processingInstruction, resolveEntity, setDocumentLocator, skippedEntity, startDocument, startPrefixMapping, unparsedEntityDecl, warning

Methods inherited from class java.lang.Object

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

Field Detail

server

public DASServerI server

parentFeatures

public java.util.HashMap parentFeatures

segments

public java.util.HashMap segments

dsn

public DASDsn dsn

segmentsToBeRequested

public java.util.HashMap segmentsToBeRequested

parentFeaturesOfSegmentsToBeRequested

public java.util.HashMap parentFeaturesOfSegmentsToBeRequested

Constructor Detail

DASFeatureContentHandler

public DASFeatureContentHandler()

DASFeatureContentHandler

public DASFeatureContentHandler(DASServerI theServer,
                                DASDsn theDsn,
                                java.util.HashMap theSegments,
                                java.util.HashMap theParentFeatures,
                                long theGlobalStart,
                                long theGlobalEnd)

Method Detail

getFeatures

public java.util.List getFeatures()

startElement

public void startElement(java.lang.String namespaceURI,
                         java.lang.String localName,
                         java.lang.String qualifiedName,
                         org.xml.sax.Attributes attributes)
                  throws org.xml.sax.SAXException

Specified by:

startElement in interface org.xml.sax.ContentHandler

Overrides:

startElement in class org.xml.sax.helpers.DefaultHandler

Throws:

org.xml.sax.SAXException

endElement

public void endElement(java.lang.String namespaceURI,
                       java.lang.String localName,
                       java.lang.String qualifiedName)
                throws org.xml.sax.SAXException

Specified by:

endElement in interface org.xml.sax.ContentHandler

Overrides:

endElement in class org.xml.sax.helpers.DefaultHandler

Throws:

org.xml.sax.SAXException

characters

public void characters(char[] text,
                       int start,
                       int length)
                throws org.xml.sax.SAXException

Specified by:

characters in interface org.xml.sax.ContentHandler

Overrides:

characters in class org.xml.sax.helpers.DefaultHandler

Throws:

org.xml.sax.SAXException