Package it.unimi.di.big.mg4j.util.parser.callback

Class AnchorExtractor

java.lang.Object

it.unimi.dsi.parser.callback.DefaultCallback

it.unimi.di.big.mg4j.util.parser.callback.AnchorExtractor

All Implemented Interfaces:

Callback

public class AnchorExtractor
extends DefaultCallback

A callback extracting anchor text. When instantiating the extractor, you can specify the number of characters to be considered before the anchor, after the anchor or during the anchor (just the first characters are taken into consideration in the last two characters, and just the last ones in the first case).

At the end of parsing, the result (the list of anchors) is available in anchors, whose elements provide the content of the href attribute the text of the anchor and around the anchor; text is however modified so that fragment of words at the beginning of the pre-anchor context, or at the end of the post-anchor context, are cut away.

For example, a fragment like: ...foo fOO FOO FOO ANCHOR TEXT BAR BAR BAr bar... (where the uppercase part represents the pre- and post-anchor context) generates the element Anchor("xxx", "FOO FOO ANCHOR TEXT BAR BAR")

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static class	AnchorExtractor.Anchor	A class representing an anchor.

Field Summary

Fields

Modifier and Type	Field	Description
ObjectList<AnchorExtractor.Anchor>	anchors	The resulting list of anchors.
static boolean	DEBUG
static Logger	LOGGER

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

EMPTY_CALLBACK_ARRAY

Constructor Summary

Constructors

Constructor	Description
AnchorExtractor(int maxPreAnchor, int maxAnchor, int maxPostAnchor)	Creates a new anchor extractor.
AnchorExtractor(int maxPreAnchor, int maxAnchor, int maxPostAnchor, String delimiter)	Creates a new anchor extractor.

Method Summary

Modifier and Type	Method	Description
boolean	characters(char[] characters, int offset, int length, boolean flowBroken)
void	configure(BulletParser parser)
void	endDocument()
boolean	endElement(Element element)
void	startDocument()
boolean	startElement(Element element, Map<Attribute,MutableString> attrMap)

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

cdata, getInstance

Methods inherited from class java.lang.Object

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

Field Detail

LOGGER

public static final Logger LOGGER

DEBUG

public static final boolean DEBUG

See Also:

Constant Field Values

anchors

public final ObjectList<AnchorExtractor.Anchor> anchors

The resulting list of anchors.

Constructor Detail

AnchorExtractor

public AnchorExtractor(int maxPreAnchor,
                       int maxAnchor,
                       int maxPostAnchor)

Creates a new anchor extractor.

Parameters:

maxPreAnchor - maximum number of characters before an anchor.

maxAnchor - maximum number of characters in an anchor.

maxPostAnchor - maximum number of characters after an anchor.

AnchorExtractor

public AnchorExtractor(int maxPreAnchor,
                       int maxAnchor,
                       int maxPostAnchor,
                       String delimiter)

Creates a new anchor extractor.

Parameters:

maxPreAnchor - maximum number of characters before an anchor.

maxAnchor - maximum number of characters in an anchor.

maxPostAnchor - maximum number of characters after an anchor.

delimiter - a token that will be inserted to delimit the anchor text, or null for no delimiter.

Method Detail

configure

public void configure(BulletParser parser)

Specified by:

configure in interface Callback

Overrides:

configure in class DefaultCallback

startDocument

public void startDocument()

Specified by:

startDocument in interface Callback

Overrides:

startDocument in class DefaultCallback

endDocument

public void endDocument()

Specified by:

endDocument in interface Callback

Overrides:

endDocument in class DefaultCallback

startElement

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

Specified by:

startElement in interface Callback

Overrides:

startElement in class DefaultCallback

endElement

public boolean endElement(Element element)

Specified by:

endElement in interface Callback

Overrides:

endElement in class DefaultCallback

characters

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

Specified by:

characters in interface Callback

Overrides:

characters in class DefaultCallback