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Java Source Code / Java Documentation » Web Server » Quadcap Web Server » org.xml.sax 
Source Cross Reference  Class Diagram Java Document (Java Doc) 


org.xml.sax.DocumentHandler

All known Subclasses:   org.xml.sax.HandlerBase,  com.quadcap.server.ServerConfigParser,  com.quadcap.http.servlets.jsp.JspHandler,  com.quadcap.text.sax.Test,  com.quadcap.text.sax.Handler,  com.quadcap.http.client.LinkChecker,
DocumentHandler
public interface DocumentHandler (Code)
Receive notification of general document events.

This is the main interface that most SAX applications implement: if the application needs to be informed of basic parsing events, it implements this interface and registers an instance with the SAX parser using the setDocumentHandler method. The parser uses the instance to report basic document-related events like the start and end of elements and character data.

The order of events in this interface is very important, and mirrors the order of information in the document itself. For example, all of an element's content (character data, processing instructions, and/or subelements) will appear, in order, between the startElement event and the corresponding endElement event.

Application writers who do not want to implement the entire interface can derive a class from HandlerBase, which implements the default functionality; parser writers can instantiate HandlerBase to obtain a default handler. The application can find the location of any document event using the Locator interface supplied by the Parser through the setDocumentLocator method.


author:
   David Megginson (ak117@freenet.carleton.ca)
version:
   1.0
See Also:   org.xml.sax.Parser.setDocumentHandler
See Also:   org.xml.sax.Locator
See Also:   org.xml.sax.HandlerBase




Method Summary
abstract public  voidcharacters(char ch, int start, int length)
     Receive notification of character data.

The Parser will call this method to report each chunk of character data.

abstract public  voidendDocument()
     Receive notification of the end of a document.

The SAX parser will invoke this method only once, and it will be the last method invoked during the parse.

abstract public  voidendElement(String name)
     Receive notification of the end of an element.
abstract public  voidignorableWhitespace(char ch, int start, int length)
     Receive notification of ignorable whitespace in element content.
abstract public  voidprocessingInstruction(String target, String data)
     Receive notification of a processing instruction.
abstract public  voidsetDocumentLocator(Locator locator)
     Receive an object for locating the origin of SAX document events.

SAX parsers are strongly encouraged (though not absolutely required) to supply a locator: if it does so, it must supply the locator to the application by invoking this method before invoking any of the other methods in the DocumentHandler interface.

The locator allows the application to determine the end position of any document-related event, even if the parser is not reporting an error.

abstract public  voidstartDocument()
     Receive notification of the beginning of a document.
abstract public  voidstartElement(String name, AttributeList atts)
     Receive notification of the beginning of an element.

The Parser will invoke this method at the beginning of every element in the XML document; there will be a corresponding endElement() event for every startElement() event (even when the element is empty).




Method Detail
characters
abstract public void characters(char ch, int start, int length) throws SAXException(Code)
Receive notification of character data.

The Parser will call this method to report each chunk of character data. SAX parsers may return all contiguous character data in a single chunk, or they may split it into several chunks; however, all of the characters in any single event must come from the same external entity, so that the Locator provides useful information.

The application must not attempt to read from the array outside of the specified range.

Note that some parsers will report whitespace using the ignorableWhitespace() method rather than this one (validating parsers must do so).


Parameters:
  ch - The characters from the XML document.
Parameters:
  start - The start position in the array.
Parameters:
  length - The number of characters to read from the array.
exception:
  org.xml.sax.SAXException - Any SAX exception, possiblywrapping another exception.
See Also:   DocumentHandler.ignorableWhitespace
See Also:   
See Also:   org.xml.sax.Locator



endDocument
abstract public void endDocument() throws SAXException(Code)
Receive notification of the end of a document.

The SAX parser will invoke this method only once, and it will be the last method invoked during the parse. The parser shall not invoke this method until it has either abandoned parsing (because of an unrecoverable error) or reached the end of input.


exception:
  org.xml.sax.SAXException - Any SAX exception, possiblywrapping another exception.



endElement
abstract public void endElement(String name) throws SAXException(Code)
Receive notification of the end of an element.

The SAX parser will invoke this method at the end of every element in the XML document; there will be a corresponding startElement() event for every endElement() event (even when the element is empty).

If the element name has a namespace prefix, the prefix will still be attached to the name.


Parameters:
  name - The element type name
exception:
  org.xml.sax.SAXException - Any SAX exception, possiblywrapping another exception.



ignorableWhitespace
abstract public void ignorableWhitespace(char ch, int start, int length) throws SAXException(Code)
Receive notification of ignorable whitespace in element content.

Validating Parsers must use this method to report each chunk of ignorable whitespace (see the W3C XML 1.0 recommendation, section 2.10): non-validating parsers may also use this method if they are capable of parsing and using content models.

SAX parsers may return all contiguous whitespace in a single chunk, or they may split it into several chunks; however, all of the characters in any single event must come from the same external entity, so that the Locator provides useful information.

The application must not attempt to read from the array outside of the specified range.


Parameters:
  ch - The characters from the XML document.
Parameters:
  start - The start position in the array.
Parameters:
  length - The number of characters to read from the array.
exception:
  org.xml.sax.SAXException - Any SAX exception, possiblywrapping another exception.
See Also:   DocumentHandler.characters



processingInstruction
abstract public void processingInstruction(String target, String data) throws SAXException(Code)
Receive notification of a processing instruction.

The Parser will invoke this method once for each processing instruction found: note that processing instructions may occur before or after the main document element.

A SAX parser should never report an XML declaration (XML 1.0, section 2.8) or a text declaration (XML 1.0, section 4.3.1) using this method.


Parameters:
  target - The processing instruction target.
Parameters:
  data - The processing instruction data, or null ifnone was supplied.
exception:
  org.xml.sax.SAXException - Any SAX exception, possiblywrapping another exception.



setDocumentLocator
abstract public void setDocumentLocator(Locator locator)(Code)
Receive an object for locating the origin of SAX document events.

SAX parsers are strongly encouraged (though not absolutely required) to supply a locator: if it does so, it must supply the locator to the application by invoking this method before invoking any of the other methods in the DocumentHandler interface.

The locator allows the application to determine the end position of any document-related event, even if the parser is not reporting an error. Typically, the application will use this information for reporting its own errors (such as character content that does not match an application's business rules). The information returned by the locator is probably not sufficient for use with a search engine.

Note that the locator will return correct information only during the invocation of the events in this interface. The application should not attempt to use it at any other time.


Parameters:
  locator - An object that can return the location ofany SAX document event.
See Also:   org.xml.sax.Locator



startDocument
abstract public void startDocument() throws SAXException(Code)
Receive notification of the beginning of a document.

The SAX parser will invoke this method only once, before any other methods in this interface or in DTDHandler (except for setDocumentLocator).


exception:
  org.xml.sax.SAXException - Any SAX exception, possiblywrapping another exception.



startElement
abstract public void startElement(String name, AttributeList atts) throws SAXException(Code)
Receive notification of the beginning of an element.

The Parser will invoke this method at the beginning of every element in the XML document; there will be a corresponding endElement() event for every startElement() event (even when the element is empty). All of the element's content will be reported, in order, before the corresponding endElement() event.

If the element name has a namespace prefix, the prefix will still be attached. Note that the attribute list provided will contain only attributes with explicit values (specified or defaulted): #IMPLIED attributes will be omitted.


Parameters:
  name - The element type name.
Parameters:
  atts - The attributes attached to the element, if any.
exception:
  org.xml.sax.SAXException - Any SAX exception, possiblywrapping another exception.
See Also:   DocumentHandler.endElement
See Also:   org.xml.sax.AttributeList
See Also:   



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