Package org.apache.lucene.analysis.pattern

# Class PatternReplaceCharFilter

java.lang.Object
java.io.Reader
org.apache.lucene.analysis.CharFilter
org.apache.lucene.analysis.charfilter.BaseCharFilter
org.apache.lucene.analysis.pattern.PatternReplaceCharFilter

All Implemented Interfaces:
  `Closeable`, `AutoCloseable`, `Readable`

public class PatternReplaceCharFilter extends BaseCharFilter
CharFilter that uses a regular expression for the target of replace string. The pattern match will be done in each "block" in char stream.

ex1) source="aa bb aa bb", pattern="(aa)\\s+(bb)" replacement="$1#$2"
output="aa#bb aa#bb" NOTE: If you produce a phrase that has different length to source string and the field is used for highlighting for a term of the phrase, you will face a trouble.

ex2) source="aa123bb", pattern="(aa)\\d+(bb)" replacement="$1 $2"
output="aa bb"
and you want to search bb and highlight it, you will get
highlight snippet="aa1<em>23bb</em>"

Since:
  Solr 1.5

- ## Field Summary

  ### Fields inherited from class org.apache.lucene.analysis.CharFilter

  `input`

  ### Fields inherited from class java.io.Reader

  `lock`

- ## Constructor Summary

  Constructors
  Constructor
  Description
  `PatternReplaceCharFilter(Pattern pattern, String replacement, Reader in)`

- ## Method Summary

  Modifier and Type
  Method
  Description
  `protected int`
  `correct(int currentOff)`
  Retrieve the corrected offset.
  `int`
  `read()`
  `int`
  `read(char[] cbuf, int off, int len)`

  ### Methods inherited from class org.apache.lucene.analysis.charfilter.BaseCharFilter

  `addOffCorrectMap, getLastCumulativeDiff`

  ### Methods inherited from class org.apache.lucene.analysis.CharFilter

  `close, correctOffset`

  ### Methods inherited from class java.io.Reader

  `mark, markSupported, nullReader, read, read, ready, reset, skip, transferTo`

  ### Methods inherited from class java.lang.Object

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

- ## Constructor Details

  - ### PatternReplaceCharFilter

    public PatternReplaceCharFilter(Pattern pattern, String replacement, Reader in)

- ## Method Details

  - ### read

    public int read(char[] cbuf, int off, int len) throws IOException
    Specified by:
      `read` in class `Reader`
    Throws:
      `IOException`

  - ### read

    public int read() throws IOException
    Overrides:
      `read` in class `Reader`
    Throws:
      `IOException`

  - ### correct

    protected int correct(int currentOff)
    Description copied from class: `BaseCharFilter`
    Retrieve the corrected offset.
    Overrides:
      `correct` in class `BaseCharFilter`