org.apache.lucene.search.uhighlight

Class DefaultPassageFormatter

java.lang.Object

org.apache.lucene.search.uhighlight.PassageFormatter

org.apache.lucene.search.uhighlight.DefaultPassageFormatter

public class DefaultPassageFormatter
extends PassageFormatter

Creates a formatted snippet from the top passages.

The default implementation marks the query terms as bold, and places ellipses between unconnected passages.

Field Summary

Fields

Modifier and Type	Field and Description
protected String	ellipsis text that will appear between two unconnected passages
protected boolean	escape true if we should escape for html
protected String	postTag text that will appear after highlighted terms
protected String	preTag text that will appear before highlighted terms

Constructor Summary

Constructors

Constructor and Description
DefaultPassageFormatter() Creates a new DefaultPassageFormatter with the default tags.
DefaultPassageFormatter(String preTag, String postTag, String ellipsis, boolean escape) Creates a new DefaultPassageFormatter with custom tags.

Method Summary

Modifier and Type	Method and Description
protected void	append(StringBuilder dest, String content, int start, int end) Appends original text to the response.
String	format(Passage[] passages, String content) Formats the top passages from content into a human-readable text snippet.

Methods inherited from class java.lang.Object

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

Field Detail

preTag

protected final String preTag

text that will appear before highlighted terms

postTag

protected final String postTag

text that will appear after highlighted terms

ellipsis

protected final String ellipsis

text that will appear between two unconnected passages

escape

protected final boolean escape

true if we should escape for html

Constructor Detail

DefaultPassageFormatter

public DefaultPassageFormatter()

Creates a new DefaultPassageFormatter with the default tags.

DefaultPassageFormatter

public DefaultPassageFormatter(String preTag,
                               String postTag,
                               String ellipsis,
                               boolean escape)

Creates a new DefaultPassageFormatter with custom tags.

Parameters:

preTag - text which should appear before a highlighted term.

postTag - text which should appear after a highlighted term.

ellipsis - text which should be used to connect two unconnected passages.

escape - true if text should be html-escaped

Method Detail

format

public String format(Passage[] passages,
                     String content)

Description copied from class: PassageFormatter

Formats the top passages from content into a human-readable text snippet.

Specified by:

format in class PassageFormatter

Parameters:

passages - top-N passages for the field. Note these are sorted in the order that they appear in the document for convenience.

content - content for the field.

Returns:

formatted highlight. Note that for the non-expert APIs in UnifiedHighlighter that return String, the toString method on the Object returned by this method is used to compute the string.

append

protected void append(StringBuilder dest,
                      String content,
                      int start,
                      int end)

Appends original text to the response.

Parameters:

dest - resulting text, possibly transformed or encoded

content - original text content

start - index of the first character in content

end - index of the character following the last character in content