JavaTM 2 Platform
Std. Ed. v1.3.1

javax.swing.text.html.parser
Class DocumentParser

java.lang.Object
  |
  +--javax.swing.text.html.parser.Parser
        |
        +--javax.swing.text.html.parser.DocumentParser
All Implemented Interfaces:
DTDConstants

public class DocumentParser
extends Parser

A Parser for HTML Documents (actually, you can specify a DTD, but you should really only use this class with the html dtd in swing). Reads an InputStream of HTML and invokes the appropriate methods in the ParserCallback class. This is the default parser used by HTMLEditorKit to parse HTML url's.

This will message the callback for all valid tags, as well as tags that are implied but not explicitly specified. For example, the html string (<p>blah) only has a p tag defined. The callback will see the following methods:

  1. handleStartTag(html, ...)
  2. handleStartTag(head, ...)
  3. handleEndTag(head)
  4. handleStartTag(body, ...)
  5. handleStartTag(p, ...)
  6. handleText(...)
  7. handleEndTag(p)
  8. handleEndTag(body)
  9. handleEndTag(html)
The items in italic are implied, that is, although they were not explicitly specified, to be correct html they should have been present (head isn't necessary, but it is still generated). For tags that are implied, the AttributeSet argument will have a value of Boolean.TRUE for the key HTMLEditorKit.ParserCallback.IMPLIED.

HTML.Attributes defines a type safe enumeration of html attributes. If an attribute key of a tag is defined in HTML.Attribute, the HTML.Attribute will be used as the key, otherwise a String will be used. For example <p foo=bar class=neat> has two attributes. foo is not defined in HTML.Attribute, where as class is, therefore the AttributeSet will have two values in it, HTML.Attribute.CLASS with a String value of 'neat' and the String key 'foo' with a String value of 'bar'.

The position argument will indicate the start of the tag, comment or text. Similiar to arrays, the first character in the stream has a position of 0. For tags that are implied the position will indicate the location of the next encountered tag. In the first example, the implied start body and html tags will have the same position as the p tag, and the implied end p, html and body tags will all have the same position.

As html skips whitespace the position for text will be the position of the first valid character, eg in the string '\n\n\nblah' the text 'blah' will have a position of 3, the newlines are skipped.

For attributes that do not have a value, eg in the html string <foo blah> the attribute blah does not have a value, there are two possible values that will be placed in the AttributeSet's value:

Once the stream has been parsed, the callback is notified of the most likely end of line string. The end of line string will be one of \n, \r or \r\n, which ever is encountered the most in parsing the stream.


Fields inherited from class javax.swing.text.html.parser.Parser
dtd, strict
 
Fields inherited from interface javax.swing.text.html.parser.DTDConstants
ANY, CDATA, CONREF, CURRENT, DEFAULT, EMPTY, ENDTAG, ENTITIES, ENTITY, FIXED, GENERAL, ID, IDREF, IDREFS, IMPLIED, MD, MODEL, MS, NAME, NAMES, NMTOKEN, NMTOKENS, NOTATION, NUMBER, NUMBERS, NUTOKEN, NUTOKENS, PARAMETER, PI, PUBLIC, RCDATA, REQUIRED, SDATA, STARTTAG, SYSTEM
 
Constructor Summary
DocumentParser(DTD dtd)
           
 
Method Summary
protected  void handleComment(char[] text)
          Called when an HTML comment is encountered.
protected  void handleEmptyTag(TagElement tag)
          Handle Empty Tag.
protected  void handleEndTag(TagElement tag)
          Handle End Tag.
protected  void handleError(int ln, String errorMsg)
          An error has occurred.
protected  void handleStartTag(TagElement tag)
          Handle Start Tag.
protected  void handleText(char[] data)
          Handle Text.
 void parse(Reader in, HTMLEditorKit.ParserCallback callback, boolean ignoreCharSet)
           
 
Methods inherited from class javax.swing.text.html.parser.Parser
endTag, error, error, error, error, flushAttributes, getAttributes, getCurrentLine, getCurrentPos, handleEOFInComment, handleTitle, makeTag, makeTag, markFirstTime, parse, parseDTDMarkup, parseMarkupDeclarations, startTag
 
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 

Constructor Detail

DocumentParser

public DocumentParser(DTD dtd)
Method Detail

parse

public void parse(Reader in,
                  HTMLEditorKit.ParserCallback callback,
                  boolean ignoreCharSet)
           throws IOException

handleStartTag

protected void handleStartTag(TagElement tag)
Handle Start Tag.
Overrides:
handleStartTag in class Parser

handleComment

protected void handleComment(char[] text)
Description copied from class: Parser
Called when an HTML comment is encountered.
Overrides:
handleComment in class Parser

handleEmptyTag

protected void handleEmptyTag(TagElement tag)
                       throws ChangedCharSetException
Handle Empty Tag.
Overrides:
handleEmptyTag in class Parser

handleEndTag

protected void handleEndTag(TagElement tag)
Handle End Tag.
Overrides:
handleEndTag in class Parser

handleText

protected void handleText(char[] data)
Handle Text.
Overrides:
handleText in class Parser

handleError

protected void handleError(int ln,
                           String errorMsg)
Description copied from class: Parser
An error has occurred.
Overrides:
handleError in class Parser

JavaTM 2 Platform
Std. Ed. v1.3.1

Submit a bug or feature
For further API reference and developer documentation, see Java 2 SDK SE Developer Documentation. That documentation contains more detailed, developer-targeted descriptions, with conceptual overviews, definitions of terms, workarounds, and working code examples.

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