org.geotools.gml

Class GMLFilterGeometry

Object

XMLFilterImpl

GMLFilterGeometry

All Implemented Interfaces:

GMLHandlerGeometry, ContentHandler, DTDHandler, EntityResolver, ErrorHandler, XMLFilter, XMLReader

public class GMLFilterGeometry
extends XMLFilterImpl
implements GMLHandlerGeometry

LEVEL2 saxGML4j GML filter: translates coordinates and GML events into OGC simple types.

This filter simply reads in the events and coordinates passed to it by its GMLFilterDocument child and converts them into JTS objects. Note that it passes through anything not specifically sent to it by GMLFilterDocument (i.e. more or less everything not in geometry.xsd). The parent of this filter must implement GMLHandlerJTS in order to receive the JTS objects passed by this filter.

Author:

Rob Hranac, Vision for New York

Constructor Summary

Constructors

Constructor and Description
GMLFilterGeometry(GMLHandlerJTS parent) Constructor with parent, which must implement GMLHandlerJTS.

Method Summary

Modifier and Type	Method and Description
void	characters(char[] ch, int start, int length) Reads the only internal characters read by pure GML parsers, which are coordinates.
void	endElement(String namespaceURI, String localName, String qName) Checks for GML element end and - if not a coordinates element - sends it directly on down the chain to the appropriate parent handler.
void	geometryEnd(String localName) Manages the end of a new main or sub geometry.
void	geometryStart(String localName, Attributes atts) Manages the start of a new main or sub geometry.
void	geometrySub(String localName) Manages a sub geometry, which simply means always pass it to the current content handler as a sub.
void	gmlCoordinates(double x, double y) Gets a coordinate from the child and passes it to the current handler as an add request.
void	gmlCoordinates(double x, double y, double z) Gets a coordinate from the child and passes it to the current handler as an add request.
void	startElement(String namespaceURI, String localName, String qName, Attributes atts) Checks for GML element start and - if not a coordinates element - sends it directly on down the chain to the appropriate parent handler.

Methods inherited from class XMLFilterImpl

endDocument, endPrefixMapping, error, fatalError, getContentHandler, getDTDHandler, getEntityResolver, getErrorHandler, getFeature, getParent, getProperty, ignorableWhitespace, notationDecl, parse, parse, processingInstruction, resolveEntity, setContentHandler, setDocumentLocator, setDTDHandler, setEntityResolver, setErrorHandler, setFeature, setParent, setProperty, skippedEntity, startDocument, startPrefixMapping, unparsedEntityDecl, warning

Methods inherited from class Object

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

Methods inherited from interface ContentHandler

endDocument, endPrefixMapping, ignorableWhitespace, processingInstruction, setDocumentLocator, skippedEntity, startDocument, startPrefixMapping

Constructor Detail

GMLFilterGeometry

public GMLFilterGeometry(GMLHandlerJTS parent)

Constructor with parent, which must implement GMLHandlerJTS.

Parameters:

parent - The parent of this filter.

Method Detail

geometryStart

public void geometryStart(String localName,
                          Attributes atts)
                   throws SAXException

Manages the start of a new main or sub geometry. This method looks at the status of the current handler and either returns a new sub-handler (if the last one was successfully returned already) or passes the element start notification along to the current handler as a sub geometry notice.

Specified by:

geometryStart in interface GMLHandlerGeometry

Parameters:

localName - The local name of the geometry, which corresponds to an OGC simple feature type.

atts - The attributes of the geometry, including SRID, etc.

Throws:

SAXException - parser error.

geometryEnd

public void geometryEnd(String localName)
                 throws SAXException

Manages the end of a new main or sub geometry. This method looks at the status of the current handler and either returns the finished JTS object to its parent or passes the element end notification along to the current handler as a sub geometry notice.

Specified by:

geometryEnd in interface GMLHandlerGeometry

Parameters:

localName - The local name of the geometry, which corresponds to an OGC simple feature type.

Throws:

SAXException - parser error.

geometrySub

public void geometrySub(String localName)
                 throws SAXException

Manages a sub geometry, which simply means always pass it to the current content handler as a sub.

Specified by:

geometrySub in interface GMLHandlerGeometry

Parameters:

localName - The local name of the geometry, which corresponds to an OGC simple feature type.

Throws:

SAXException - parser error.

gmlCoordinates

public void gmlCoordinates(double x,
                           double y)
                    throws SAXException

Gets a coordinate from the child and passes it to the current handler as an add request.

Specified by:

gmlCoordinates in interface GMLHandlerGeometry

Parameters:

x - The X coordinate of the received coordinate.

y - The Y coordinate of the received coordinate.

Throws:

SAXException - parser error.

gmlCoordinates

public void gmlCoordinates(double x,
                           double y,
                           double z)
                    throws SAXException

Gets a coordinate from the child and passes it to the current handler as an add request.

Specified by:

gmlCoordinates in interface GMLHandlerGeometry

Parameters:

x - The X coordinate of the received coordinate.

y - The Y coordinate of the received coordinate.

z - The Z coordinate of the received coordinate.

Throws:

SAXException - parser error.

startElement

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

Checks for GML element start and - if not a coordinates element - sends it directly on down the chain to the appropriate parent handler. If it is a coordinates (or coord) element, it uses internal methods to set the current state of the coordinates reader appropriately.

Specified by:

startElement in interface ContentHandler

Overrides:

startElement in class XMLFilterImpl

Parameters:

namespaceURI - The namespace of the element.

localName - The local name of the element.

qName - The full name of the element, including namespace prefix.

atts - The element attributes.

Throws:

SAXException - Some parsing error occurred while reading coordinates.

characters

public void characters(char[] ch,
                       int start,
                       int length)
                throws SAXException

Reads the only internal characters read by pure GML parsers, which are coordinates. These coordinates are sent to the coordinates reader class which interprets them appropriately, depending on its current state.

Specified by:

characters in interface ContentHandler

Overrides:

characters in class XMLFilterImpl

Parameters:

ch - Raw coordinate string from the GML document.

start - Beginning character position of raw coordinate string.

length - Length of the character string.

Throws:

SAXException - Some parsing error occurred while reading coordinates.

endElement

public void endElement(String namespaceURI,
                       String localName,
                       String qName)
                throws SAXException

Checks for GML element end and - if not a coordinates element - sends it directly on down the chain to the appropriate parent handler. If it is a coordinates (or coord) element, it uses internal methods to set the current state of the coordinates reader appropriately.

Specified by:

endElement in interface ContentHandler

Overrides:

endElement in class XMLFilterImpl

Parameters:

namespaceURI - The namespace of the element.

localName - The local name of the element.

qName - The full name of the element, including namespace prefix.

Throws:

SAXException - Some parsing error occurred while reading coordinates.