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Lucene example source code file (DateRecognizerSinkFilter.java)

This example Lucene source code file (DateRecognizerSinkFilter.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Java - Lucene tags/keywords

chartermattribute, date, date, date_type, date_type, dateformat, dateformat, daterecognizersinkfilter, daterecognizersinkfilter, override, parseexception, sinkfilter, string, text, util

The Lucene DateRecognizerSinkFilter.java source code

package org.apache.lucene.analysis.sinks;

 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *     http://www.apache.org/licenses/LICENSE-2.0
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * See the License for the specific language governing permissions and
 * limitations under the License.

import java.text.DateFormat;
import java.text.ParseException;
import java.util.Date;

import org.apache.lucene.analysis.TeeSinkTokenFilter.SinkFilter;
import org.apache.lucene.analysis.tokenattributes.CharTermAttribute;
import org.apache.lucene.util.AttributeSource;

 * Attempts to parse the {@link org.apache.lucene.analysis.Token#termBuffer()} as a Date using a {@link java.text.DateFormat}.
 * If the value is a Date, it will add it to the sink.
 * <p/> 
public class DateRecognizerSinkFilter extends SinkFilter {
  public static final String DATE_TYPE = "date";

  protected DateFormat dateFormat;
  protected CharTermAttribute termAtt;
   * Uses {@link java.text.SimpleDateFormat#getDateInstance()} as the {@link java.text.DateFormat} object.
  public DateRecognizerSinkFilter() {
  public DateRecognizerSinkFilter(DateFormat dateFormat) {
    this.dateFormat = dateFormat; 

  public boolean accept(AttributeSource source) {
    if (termAtt == null) {
      termAtt = source.addAttribute(CharTermAttribute.class);
    try {
      Date date = dateFormat.parse(termAtt.toString());//We don't care about the date, just that we can parse it as a date
      if (date != null) {
        return true;
    } catch (ParseException e) {
    return false;


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