org.apache.tools.ant.taskdefs.optional.ejb

Class DescriptorHandler

java.lang.Object

org.xml.sax.HandlerBase

org.apache.tools.ant.taskdefs.optional.ejb.DescriptorHandler

All Implemented Interfaces:

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

public class DescriptorHandler
extends org.xml.sax.HandlerBase

Inner class used by EjbJar to facilitate the parsing of deployment descriptors and the capture of appropriate information. Extends HandlerBase so it only implements the methods needed. During parsing creates a hashtable consisting of entries mapping the name it should be inserted into an EJB jar as to a File representing the file on disk. This list can then be accessed through the getFiles() method.

Field Summary

Fields

Modifier and Type	Field and Description
protected String	currentElement Instance variable used to store the name of the current element being processed by the SAX parser.
protected String	currentText The text of the current element
protected Hashtable	ejbFiles Instance variable that stores the names of the files as they will be put into the jar file, mapped to File objects Accessed by the SAX parser call-back method characters().
protected String	ejbName Instance variable that stores the value found in the <ejb-name> element

Constructor Summary

Constructors

Constructor and Description
DescriptorHandler(Task task, File srcDir) Constructor for DescriptorHandler.

Method Summary

Modifier and Type	Method and Description
void	characters(char[] ch, int start, int length) SAX parser call-back method invoked whenever characters are located within an element.
void	endElement(String name) SAX parser call-back method that is invoked when an element is exited.
String	getEjbName() Getter method that returns the value of the <ejb-name> element.
Hashtable	getFiles() Getter method that returns the set of files to include in the EJB jar.
String	getPublicId() Get the publicId of the DTD
protected void	processElement() Called when an endelement is seen.
void	registerDTD(String publicId, String location) Register a dtd with a location.
org.xml.sax.InputSource	resolveEntity(String publicId, String systemId) Resolve the entity.
void	startDocument() SAX parser call-back method that is used to initialize the values of some instance variables to ensure safe operation.
void	startElement(String name, org.xml.sax.AttributeList attrs) SAX parser call-back method that is invoked when a new element is entered into.

Methods inherited from class org.xml.sax.HandlerBase

endDocument, error, fatalError, ignorableWhitespace, notationDecl, processingInstruction, setDocumentLocator, unparsedEntityDecl, warning

Methods inherited from class java.lang.Object

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

Field Detail

currentElement

protected String currentElement

Instance variable used to store the name of the current element being processed by the SAX parser. Accessed by the SAX parser call-back methods startElement() and endElement().

currentText

protected String currentText

The text of the current element

ejbFiles

protected Hashtable ejbFiles

Instance variable that stores the names of the files as they will be put into the jar file, mapped to File objects Accessed by the SAX parser call-back method characters().

ejbName

protected String ejbName

Instance variable that stores the value found in the <ejb-name> element

Constructor Detail

DescriptorHandler

public DescriptorHandler(Task task,
                         File srcDir)

Constructor for DescriptorHandler.

Parameters:

task - the task that owns this descriptor

srcDir - the source directory

Method Detail

characters

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

SAX parser call-back method invoked whenever characters are located within an element. currentAttribute (modified by startElement and endElement) tells us whether we are in an interesting element (one of the up to four classes of an EJB). If so then converts the classname from the format org.apache.tools.ant.Parser to the convention for storing such a class, org/apache/tools/ant/Parser.class. This is then resolved into a file object under the srcdir which is stored in a Hashtable.

Specified by:

characters in interface org.xml.sax.DocumentHandler

Overrides:

characters in class org.xml.sax.HandlerBase

Parameters:

ch - A character array containing all the characters in the element, and maybe others that should be ignored.

start - An integer marking the position in the char array to start reading from.

length - An integer representing an offset into the char array where the current data terminates.

Throws:

org.xml.sax.SAXException - on error

endElement

public void endElement(String name)
                throws org.xml.sax.SAXException

SAX parser call-back method that is invoked when an element is exited. Used to blank out (set to the empty string, not nullify) the name of the currentAttribute. A better method would be to use a stack as an instance variable, however since we are only interested in leaf-node data this is a simpler and workable solution.

Specified by:

endElement in interface org.xml.sax.DocumentHandler

Overrides:

endElement in class org.xml.sax.HandlerBase

Parameters:

name - The name of the attribute being exited. Ignored in this implementation.

Throws:

org.xml.sax.SAXException - on error

getEjbName

public String getEjbName()

Getter method that returns the value of the <ejb-name> element.

Returns:

the ejb name

getFiles

public Hashtable getFiles()

Getter method that returns the set of files to include in the EJB jar.

Returns:

the map of files

getPublicId

public String getPublicId()

Get the publicId of the DTD

Returns:

the public id

processElement

protected void processElement()

Called when an endelement is seen. This may be overridden in derived classes. This updates the ejbfiles if the element is an interface or a bean class. This updates the ejbname if the element is an ejb name.

registerDTD

public void registerDTD(String publicId,
                        String location)

Register a dtd with a location. The location is one of a filename, a resource name in the classpath, or a URL.

Parameters:

publicId - the public identity of the dtd

location - the location of the dtd

resolveEntity

public org.xml.sax.InputSource resolveEntity(String publicId,
                                             String systemId)
                                      throws org.xml.sax.SAXException

Resolve the entity.

Specified by:

resolveEntity in interface org.xml.sax.EntityResolver

Overrides:

resolveEntity in class org.xml.sax.HandlerBase

Parameters:

publicId - The public identifier, or null if none is available.

systemId - The system identifier provided in the XML document. Will not be null.

Returns:

an inputsource for this identifier

Throws:

org.xml.sax.SAXException - if there is a problem.

See Also:

EntityResolver.resolveEntity(String, String).

startDocument

public void startDocument()
                   throws org.xml.sax.SAXException

SAX parser call-back method that is used to initialize the values of some instance variables to ensure safe operation.

Specified by:

startDocument in interface org.xml.sax.DocumentHandler

Overrides:

startDocument in class org.xml.sax.HandlerBase

Throws:

org.xml.sax.SAXException - on error

startElement

public void startElement(String name,
                         org.xml.sax.AttributeList attrs)
                  throws org.xml.sax.SAXException

SAX parser call-back method that is invoked when a new element is entered into. Used to store the context (attribute name) in the currentAttribute instance variable.

Specified by:

startElement in interface org.xml.sax.DocumentHandler

Overrides:

startElement in class org.xml.sax.HandlerBase

Parameters:

name - The name of the element being entered.

attrs - Attributes associated to the element.

Throws:

org.xml.sax.SAXException - on error