Package org.apache.jackrabbit.core.query.lucene

Class WeightedHighlighter

java.lang.Object

org.apache.jackrabbit.core.query.lucene.DefaultHighlighter

org.apache.jackrabbit.core.query.lucene.WeightedHighlighter

public class WeightedHighlighter
extends DefaultHighlighter

WeightedHighlighter implements a highlighter that weights the fragments based on the proximity of the highlighted terms to each other. The returned fragments are not necessarily in sequence as the text occurs in the content.

Field Summary

Fields inherited from class org.apache.jackrabbit.core.query.lucene.DefaultHighlighter

DEFAULT_MAXFRAGMENTS, DEFAULT_SURROUND, END_EXCERPT, END_FRAGMENT_SEPARATOR, END_HIGHLIGHT, START_EXCERPT, START_FRAGMENT_SEPARATOR, START_HIGHLIGHT

Constructor Summary

Constructors

Modifier	Constructor	Description
protected	WeightedHighlighter()

Method Summary

Modifier and Type	Method	Description
static String	highlight(org.apache.lucene.index.TermPositionVector tvec, Set<org.apache.lucene.index.Term[]> queryTerms, String text, int maxFragments, int surround)
static String	highlight(org.apache.lucene.index.TermPositionVector tvec, Set<org.apache.lucene.index.Term[]> queryTerms, String text, String excerptStart, String excerptEnd, String fragmentStart, String fragmentEnd, String hlStart, String hlEnd, int maxFragments, int surround)
protected String	mergeFragments(org.apache.lucene.index.TermVectorOffsetInfo[] offsets, String text, String excerptStart, String excerptEnd, String fragmentStart, String fragmentEnd, String hlStart, String hlEnd, int maxFragments, int surround)

Methods inherited from class org.apache.jackrabbit.core.query.lucene.DefaultHighlighter

createDefaultExcerpt, doHighlight, escape

Methods inherited from class java.lang.Object

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

Constructor Detail

WeightedHighlighter

protected WeightedHighlighter()

Method Detail

highlight

public static String highlight(org.apache.lucene.index.TermPositionVector tvec,
                               Set<org.apache.lucene.index.Term[]> queryTerms,
                               String text,
                               String excerptStart,
                               String excerptEnd,
                               String fragmentStart,
                               String fragmentEnd,
                               String hlStart,
                               String hlEnd,
                               int maxFragments,
                               int surround)
                        throws IOException

Parameters:

tvec - the term position vector for this hit

queryTerms - the query terms.

text - the original text that was used to create the tokens.

excerptStart - this string is prepended to the excerpt

excerptEnd - this string is appended to the excerpt

fragmentStart - this string is prepended to every fragment

fragmentEnd - this string is appended to the end of every fragment.

hlStart - the string used to prepend a highlighted token, for example "<b>"

hlEnd - the string used to append a highlighted token, for example "</b>"

maxFragments - the maximum number of fragments

surround - the maximum number of chars surrounding a highlighted token

Returns:

a String with text fragments where tokens from the query are highlighted

Throws:

IOException

highlight

public static String highlight(org.apache.lucene.index.TermPositionVector tvec,
                               Set<org.apache.lucene.index.Term[]> queryTerms,
                               String text,
                               int maxFragments,
                               int surround)
                        throws IOException

Parameters:

tvec - the term position vector for this hit

queryTerms - the query terms.

text - the original text that was used to create the tokens.

maxFragments - the maximum number of fragments

surround - the maximum number of chars surrounding a highlighted token

Returns:

a String with text fragments where tokens from the query are highlighted

Throws:

IOException

mergeFragments

protected String mergeFragments(org.apache.lucene.index.TermVectorOffsetInfo[] offsets,
                                String text,
                                String excerptStart,
                                String excerptEnd,
                                String fragmentStart,
                                String fragmentEnd,
                                String hlStart,
                                String hlEnd,
                                int maxFragments,
                                int surround)
                         throws IOException

Overrides:

mergeFragments in class DefaultHighlighter

Throws:

IOException