it.unimi.dsi.parser.callback
Class TextExtractor

java.lang.Object
  it.unimi.dsi.parser.callback.DefaultCallback
      it.unimi.dsi.parser.callback.TextExtractor

All Implemented Interfaces:

Callback

public class TextExtractor
extends DefaultCallback

A callback extracting text and titles.

This callbacks extracts all text in the page, and the title. The resulting text is available through text, and the title through title.

Note that text and title are never trimmed.

Field Summary

MutableString	text The text resulting from the parsing process.
MutableString	title The title resulting from the parsing process.

Fields inherited from interface it.unimi.dsi.parser.callback.Callback

EMPTY_CALLBACK_ARRAY

Constructor Summary

TextExtractor()

Method Summary

boolean	characters(char[] characters, int offset, int length, boolean flowBroken) Receive notification of character data inside an element.
void	configure(BulletParser parser) Configure the parser to parse text.
boolean	endElement(Element element) Receive notification of the end of an element.
void	startDocument() Receive notification of the beginning of the document.
boolean	startElement(Element element, Map<Attribute,MutableString> attrMapUnused) Receive notification of the start of an element.

Methods inherited from class it.unimi.dsi.parser.callback.DefaultCallback

cdata, endDocument, getInstance

Methods inherited from class java.lang.Object

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

Field Detail

text

public final MutableString text

The text resulting from the parsing process.

title

public final MutableString title

The title resulting from the parsing process.

Constructor Detail

TextExtractor

public TextExtractor()

Method Detail

configure

public void configure(BulletParser parser)

Configure the parser to parse text.

Specified by:

configure in interface Callback

Overrides:

configure in class DefaultCallback

startDocument

public void startDocument()

Description copied from interface: Callback

Receive notification of the beginning of the document.

The callback must use this method to reset its internal state so that it can be resued. It must be safe to invoke this method several times.

Specified by:

startDocument in interface Callback

Overrides:

startDocument in class DefaultCallback

characters

public boolean characters(char[] characters,
                          int offset,
                          int length,
                          boolean flowBroken)

Description copied from interface: Callback

Receive notification of character data inside an element.

You must not write into text, as it could be passed around to many callbacks.

flowBroken will be true iff the flow was broken before text. This feature makes it possible to extract quickly the text in a document without looking at the elements.

Specified by:

characters in interface Callback

Overrides:

characters in class DefaultCallback

Parameters:

characters - an array containing the character data.

offset - the start position in the array.

length - the number of characters to read from the array.

flowBroken - whether the flow is broken at the start of text.

Returns:

true to keep the parser parsing, false to stop it.

endElement

public boolean endElement(Element element)

Description copied from interface: Callback

Receive notification of the end of an element. Warning: unless specific decorators are used, in general a callback will just receive notifications for elements whose closing tag appears explicitly in the document.

This method will never be called for element without closing tags, even if such a tag is found.

Specified by:

endElement in interface Callback

Overrides:

endElement in class DefaultCallback

Parameters:

element - the element whose closing tag was found.

Returns:

true to keep the parser parsing, false to stop it.

startElement

public boolean startElement(Element element,
                            Map<Attribute,MutableString> attrMapUnused)

Description copied from interface: Callback

Receive notification of the start of an element.

For simple elements, this is the only notification that the callback will ever receive.

Specified by:

startElement in interface Callback

Overrides:

startElement in class DefaultCallback

Parameters:

element - the element whose opening tag was found.

attrMapUnused - a map from Attributes to MutableStrings.

Returns:

true to keep the parser parsing, false to stop it.