Variable in Java

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Table 27-3 Variable
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documentType
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Variables of the PullParser Class Type
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String
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Default
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Description
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The type of document to be parsed either
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PullParserXML
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PullParserJSON
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27 Using External Data Sources
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Table 7Variable
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input
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Variables of the Pul lP ars e Class (Continued) l P s Type
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InputStream
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null
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The source of the XML or JSON to be parsed The encoding used for the input document If true, causes text elements that are entirely whitespace to be ignored Callback function to which parsing events are delivered The current parsing event The encoding of the input document as detected by the parser The line number of the element currently being parsed The column number of the element currently being parsed
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encoding
String
UTF-8
ignoreWhiteSpace
Boolean
false
onEvent
function (:Event):Void
null
event characterEncoding
Event String
line
Integer
column
Integer
Stream Parsing To use the PullParser class in streaming mode, you initialize it with an input source, set the documentType variable to either PullParserXML or PullParserJSON, install a function that will handle callbacks as the input is parsed, and then call the parse() function Parsing is synchronous and will be completed before this call returnsThe code in Listing 27-2, which you ll find in the file javafxdata/XMLParsing1fx, parses XML held in a string and reports the events delivered to its callback function on the console
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Listing 27-2
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22
Stream Parsing with the PullParser Class
var xml = '< xml version="10" encoding="UTF-8" >' '<!--- Membership list -->' '<members>' ' <member>' ' <id>' ' <name>John Doe</name>' ' <address type="home">Here</address>' ' <address type="business">There</address>' ' </id>' ' <membership-type>Full</membership-type>' ' </member>' '</members>'; var parser = PullParser { documentType: PullParserXML input: new ByteArrayInputStream(xmlgetBytes("UTF-8")) onEvent: function(evt) { println(evt); } } parserparse();
The PullParser object is created on lines 15 to 21 and initialized to parse XML (line 16) from the string assigned to the xml variableA PullParser requires an InputStream as its source, so we first convert the string to an array of bytes encoded in UTF-87 and then create a ByteArrayInputStream from the resultAs the XML is parsed, events are reported to the function installed in the onEvent variable on lines 18 to 20The argument passed to this function is of type javafxdatapullEventThe Event class is used when parsing both XML and JSON and has some variables that are set only when processing XML and others that are meaningful only when processing JSONThe variables that are relevant to XML processing are listed in Table 27-4
Table 27-4 Variable
type
Variables of the Event Class That Are Relevant to XML Parsing Type
Integer
Access
Description
The event type, such as
PullParserSTART_ELEMENT
We chose UTF-8 because this is the encoding that the parser expects by default You can use a different encoding if you want, provided that you set the encoding variable of the PullParser to reflect your chosen encoding
27 Using External Data Sources
le 27-4 Variable
typeName qname level text
Variables of the Event Clas That Are Relevant o XML Parsing (Continued) Type
String QName Integer String
Access
R R R R
Description
The event type in human-readable form The fully-qualified name of the current element The nesting level of the current element, where the root element has level 0 The text associated with a TEXT element
Each event has a type, given by the type variable, which indicates which event is being reported; the typeName variable contains a human-readable representation of the event type which is useful for debugging purposesThe level variable specifies the nesting level of the XML element to which the event relates and the qname variable is its fully qualified name XML element names are made up of two parts a simple name and an optional prefix that indicates the namespace that defines the nameThe qname variable is of type javafxdataxmlQName, which is a class that encapsulates the element name, its namespace prefix, and the URI of the namespace itself Simple XML documents, such as the one in this example (and those returned by some commonly used web services), do not use namespaces at all, which makes the document easier to read and your code easier to write because you only need to check the simple name of an element to identify itThe text variable is set to report a run of text in the document We ll use the output from the code in Listing 27-2 to illustrate how the parser works Later in this chapter, you ll see real-world examples that actually act on upon the results of an XML parsing operation:
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 type:7 typeName:START_DOCUMENT level:0 qname:null text:'' namespaces:null attributes:null type:1 typeName:START_ELEMENT level:0 qname:members text:'' namespaces:{} attributes:{} type:4 typeName:TEXT level:0 qname:members text:' ' namespaces:null attributes:null type:1 typeName:START_ELEMENT level:1 qname:member text:'' namespaces:{} attributes:{} type:4 typeName:TEXT level:1 qname:member text:' ' namespaces:null attributes:null type:1 typeName:START_ELEMENT level:2 qname:id text:'' namespaces:{} attributes:{} type:4 typeName:TEXT level:2 qname:id text:' ' namespaces:null attributes:null type:1 typeName:START_ELEMENT level:3 qname:name text:'' namespaces:{} attributes:{} type:4 typeName:TEXT level:3 qname:name text:'John Doe' namespaces:null attributes:null type:2 typeName:END_ELEMENT level:3 qname:name text:'John Doe' namespaces:{} attributes:null