Package edu.ucsb.nceas.metacat.service

Class XMLNamespaceParser

java.lang.Object

org.xml.sax.helpers.DefaultHandler

edu.ucsb.nceas.metacat.service.XMLNamespaceParser

All Implemented Interfaces:

ContentHandler, DTDHandler, EntityResolver, ErrorHandler

public class XMLNamespaceParser
extends DefaultHandler

This class will parse the root element to figure out the namespace of the root element(we also call it the namespace of the element). If it doesn't have a namespace, but it does have an attribute of noNamespaceSchemaLocation at the root element, it will get the value as well.

Author:

tao

Constructor Summary

Constructors

Constructor	Description
XMLNamespaceParser(Reader xml)	Constructor

Method Summary

Modifier and Type	Method	Description
String	getNamespace()	Get the namespace of the document (root element).
String	getNoNamespaceSchemaLocation()	Get the value of noNamespaceSchemaLocation of the document (root element).
void	parse()	Parse the xml file
void	startElement(String uri, String localName, String qName, Attributes atts)	SAX Handler that is called at the start of each XML element

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

characters, endDocument, endElement, 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

Methods inherited from interface org.xml.sax.ContentHandler

declaration

Constructor Details

XMLNamespaceParser

public XMLNamespaceParser(Reader xml)
                   throws SAXException,
edu.ucsb.nceas.utilities.PropertyNotFoundException

Constructor

Parameters:

xml - the xml object which will be parsed

Throws:

SAXException

edu.ucsb.nceas.utilities.PropertyNotFoundException

Method Details

parse

public void parse()
           throws SAXException,
IOException

Parse the xml file

Throws:

SAXException - if some sax related exception happens

IOException - if the schema content couldn't be found

startElement

public void startElement(String uri,
 String localName,
 String qName,
 Attributes atts)
                  throws SAXException

SAX Handler that is called at the start of each XML element

Specified by:

startElement in interface ContentHandler

Overrides:

startElement in class DefaultHandler

Throws:

SAXException

getNamespace

public String getNamespace()

Get the namespace of the document (root element). The parse() method should be called first

Returns:

the value of the namespace. A null will be returned if it can't be found.

getNoNamespaceSchemaLocation

public String getNoNamespaceSchemaLocation()

Get the value of noNamespaceSchemaLocation of the document (root element). The parse() method should be called first

Returns:

the value of the noNamespaceSchemaLocation. A null will be returned if it can't be found.