com.ibm.di.parser.xml
Class XMLParser2

java.lang.Object
  com.ibm.di.parser.ParserImpl
      com.ibm.di.parser.xml.XMLParser2

All Implemented Interfaces:

ParserInterface, VersionInfoInterface

Direct Known Subclasses:

CBEParser, IdMLParser, SPMLv2Parser

public class XMLParser2
extends ParserImpl
implements ParserInterface

The Parser used to parse XML documents using the XLXP implementation of the StAX XML Parser. This parser is able to write XML using the same library.

Since:

7.0

Field Summary

protected String	attrsDeclaration the attributes declaration parameter as String
protected String	charEncoding String which value is used for decoding the InputStream and encoding the OutputStream
protected boolean	coalescing shows whether any text characters and the CDATA section will be treated as text.
protected ByteArrayOutputStream	currentEntryAsXML When parsing the XML the Parser will write in this stream so we have String representation of the returned Entry
protected String	currentEntryAsXMLString This variable just holds the current Entry as XML string so we do not decode the stream twice or more.
static String	DEFAULT_ENCODING The default encoding to use if the user have not specified one or we were unable to find the actual encoding
protected static String	DUMMY_ROOT_NAME This is the name of the root tag that will be plugged in to handle multiple root tag XMLs.
protected String[]	entryTag the value of the Entry Tag parameter. position 0 holds the declared prefix or null if none position 1 holds the declared localName or null if none position 2 holds the declared namespaceURI or null if none defined
protected boolean	firstWriteStart shows if the start root elements are to be written for first time
protected boolean	indentOutput shows whether the output should be indented
protected String	nsMap the prefix to namespaceURI map as String
protected NamespacesTracker	nsTracker Used for tracking the written namespaces
protected boolean	skipXMLOnReading skip repeating XML declarations when reading
protected boolean	skipXMLOnWriting omit XML declaration in the beginning of the output
protected boolean	standaloneRoot shows if the static roots should be output on each entry
protected String[]	valueTag the value of the Value Tag parameter.
protected boolean	wrapUnwrapEntry Flag that shows whether the entry will be wrapped in a tag or not.
protected String	xmlVersion the XML version to put in XML declaration when writing
protected SimpleXPathEvaluator	xPath this object is used for compiling the input parameters and when navigating through XML elements
protected String	xPathStr the raw Simple xPath string
protected String	xsdPath the XSD URLs String

Fields inherited from class com.ibm.di.parser.ParserImpl

_debug, myConfiguration

Constructor Summary

XMLParser2()
Constructs the XMLParser2 object.

Method Summary

void	closeParser() This method closes the parser's streams
ByteArrayInputStream	getCurrentEntryAsXMLStream()
String	getCurrentEntryAsXMLString() Converts current entry to XML.
List<QName>	getCurrentEntryPath() Retrieves current xPath's nodes parser is working on.
protected Log	getLogger() Retrieves log object.
HashMap<String,String>	getSchemaLocationFromXML() This method runs through the XML and tries to find any XSD URLs
String	getVersion() print the version of the component
protected void	initInput() Initializes the Input.
protected void	initOutput() Initializes the Output.
void	initParser() Initializes the parser.
Object	querySchema(Object schema) Discover the schema for the Parser.
Entry	readEntry() Retrieves an Entry object from the XML document.
void	writeEntry(Entry entry) Writes the passed as parameter Entry object as a XML data.

Methods inherited from class com.ibm.di.parser.ParserImpl

debug, debugMode, flush, getClassInstance, getContext, getDebug, getInputStream, getOutputStream, getParam, getParser, getReader, getWriter, isDeltaSupported, logmsg, registerScriptBeans, setConfiguration, setContext, setDebug, setInputStream, setInputStream, setInputStream, setOutputStream, setOutputStream, setParam, setParser

Methods inherited from class java.lang.Object

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

Methods inherited from interface com.ibm.di.parser.ParserInterface

flush, getContext, getDebug, getParam, getParser, getReader, getWriter, isDeltaSupported, registerScriptBeans, setConfiguration, setContext, setDebug, setInputStream, setInputStream, setInputStream, setOutputStream, setOutputStream, setParam, setParser

Field Detail

DEFAULT_ENCODING

public static final String DEFAULT_ENCODING

The default encoding to use if the user have not specified one or we were unable to find the actual encoding

See Also:

Constant Field Values

DUMMY_ROOT_NAME

protected static final String DUMMY_ROOT_NAME

This is the name of the root tag that will be plugged in to handle multiple root tag XMLs. This should never be visible to the end-user

See Also:

Constant Field Values

currentEntryAsXML

protected ByteArrayOutputStream currentEntryAsXML

When parsing the XML the Parser will write in this stream so we have String representation of the returned Entry

currentEntryAsXMLString

protected String currentEntryAsXMLString

This variable just holds the current Entry as XML string so we do not decode the stream twice or more.

xsdPath

protected String xsdPath

the XSD URLs String

xPathStr

protected String xPathStr

the raw Simple xPath string

nsMap

protected String nsMap

the prefix to namespaceURI map as String

charEncoding

protected String charEncoding

String which value is used for decoding the InputStream and encoding the OutputStream

xmlVersion

protected String xmlVersion

the XML version to put in XML declaration when writing

attrsDeclaration

protected String attrsDeclaration

the attributes declaration parameter as String

entryTag

protected String[] entryTag

the value of the Entry Tag parameter.
position 0 holds the declared prefix or null if none
position 1 holds the declared localName or null if none
position 2 holds the declared namespaceURI or null if none defined

valueTag

protected String[] valueTag

the value of the Value Tag parameter. If nothing specified "value" will be assumed.
position 0 holds the declared prefix or null if none
position 1 holds the declared localName or null if none
position 2 holds the declared namespaceURI or null if none defined

wrapUnwrapEntry

protected boolean wrapUnwrapEntry

Flag that shows whether the entry will be wrapped in a tag or not.

skipXMLOnWriting

protected boolean skipXMLOnWriting

omit XML declaration in the beginning of the output

skipXMLOnReading

protected boolean skipXMLOnReading

skip repeating XML declarations when reading

coalescing

protected boolean coalescing

shows whether any text characters and the CDATA section will be treated as text.

firstWriteStart

protected boolean firstWriteStart

shows if the start root elements are to be written for first time

standaloneRoot

protected boolean standaloneRoot

shows if the static roots should be output on each entry

indentOutput

protected boolean indentOutput

shows whether the output should be indented

xPath

protected SimpleXPathEvaluator xPath

this object is used for compiling the input parameters and when navigating through XML elements

nsTracker

protected NamespacesTracker nsTracker

Used for tracking the written namespaces

Constructor Detail

XMLParser2

public XMLParser2()

Constructs the XMLParser2 object.

Method Detail

initParser

public void initParser()
                throws Exception

Initializes the parser.

Specified by:

initParser in interface ParserInterface

Overrides:

initParser in class ParserImpl

Throws:

Exception - - if initialization error occurs

initInput

protected void initInput()
                  throws Exception

Initializes the Input. Note: this parser relies on a Reader object to read the XML document.

Throws:

Exception - - in case of a read error occurs.

See Also:

ParserImpl.setInputStream(java.io.Reader)

initOutput

protected void initOutput()
                   throws Exception

Initializes the Output.

Throws:

Exception - - in case of write error occurs.

readEntry

public Entry readEntry()
                throws Exception

Retrieves an Entry object from the XML document.

Specified by:

readEntry in interface ParserInterface

Returns:

an Object Model of the parsed XML, or null if no more data could be retrieved

Throws:

Exception - - if an error occurs while parsing

writeEntry

public void writeEntry(Entry entry)
                throws Exception

Writes the passed as parameter Entry object as a XML data.

Specified by:

writeEntry in interface ParserInterface

Parameters:

entry - - the entry that should be written as XML

Throws:

Exception - - in case of write error occurs

getVersion

public String getVersion()

print the version of the component

Specified by:

getVersion in interface VersionInfoInterface

Returns:

the version as String

closeParser

public void closeParser()
                 throws Exception

This method closes the parser's streams

Specified by:

closeParser in interface ParserInterface

Overrides:

closeParser in class ParserImpl

Throws:

Exception - in case an error occurs

getCurrentEntryAsXMLStream

public ByteArrayInputStream getCurrentEntryAsXMLStream()

Returns:

XML representation of the last retrieved entry (or null if no entry was found) as a ByteArrayInputStream object encoded using the specified in the characterSet parameter encoding. If the specified encoding is UTF-16LE, UTF-16BE, UTF-32LE, UTF-32BE then the first few bytes will be BOM bytes.

getCurrentEntryAsXMLString

public String getCurrentEntryAsXMLString()
                                  throws UnsupportedEncodingException

Converts current entry to XML.

Returns:

XML representation of the last retrieved entry (or null if no entry was found) as a decoded String object with removed BOM

Throws:

UnsupportedEncodingException - - if the specified encoding is not supported

getCurrentEntryPath

public List<QName> getCurrentEntryPath()

Retrieves current xPath's nodes parser is working on.

Returns:

current xPath's nodes parser is working on

getLogger

protected Log getLogger()

Retrieves log object.

Returns:

the Log used for logging.

querySchema

public Object querySchema(Object schema)
                   throws Exception

Discover the schema for the Parser. For example, a XML Parser could return a representation of the XML Schema or the DTD referenced in a XML file.

Specified by:

querySchema in interface ParserInterface

Overrides:

querySchema in class ParserImpl

Parameters:

schema - The object on which to discover schema

Returns:

A Vector of com.ibm.di.entry.Entry objects describing each entity

Throws:

Exception - If an I/O error occurs

getSchemaLocationFromXML

public HashMap<String,String> getSchemaLocationFromXML()
                                                throws Exception

This method runs through the XML and tries to find any XSD URLs

Returns:

HashMap - the mapping is from the xsdURL to xsdNamespace

Throws:

Exception - - in case parsing exception occurs