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Lucene example source code file (NumericPayloadTokenFilterTest.java)

This example Lucene source code file (NumericPayloadTokenFilterTest.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, d, d, io, ioexception, ioexception, mocktokenizer, numericpayloadtokenfilter, numericpayloadtokenfilter, numericpayloadtokenfiltertest, override, tokenfilter, typeattribute, wordtokenfilter, wordtokenfilter

The Lucene NumericPayloadTokenFilterTest.java source code

package org.apache.lucene.analysis.payloads;

/**
 * Copyright 2004 The Apache Software Foundation
 *
 * Licensed 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,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

import org.apache.lucene.analysis.BaseTokenStreamTestCase;
import org.apache.lucene.analysis.MockTokenizer;
import org.apache.lucene.analysis.TokenFilter;
import org.apache.lucene.analysis.TokenStream;
import org.apache.lucene.analysis.tokenattributes.CharTermAttribute;
import org.apache.lucene.analysis.tokenattributes.PayloadAttribute;
import org.apache.lucene.analysis.tokenattributes.TypeAttribute;

import java.io.IOException;
import java.io.StringReader;

public class NumericPayloadTokenFilterTest extends BaseTokenStreamTestCase {

  public void test() throws IOException {
    String test = "The quick red fox jumped over the lazy brown dogs";

    NumericPayloadTokenFilter nptf = new NumericPayloadTokenFilter(new WordTokenFilter(new MockTokenizer(new StringReader(test), MockTokenizer.WHITESPACE, false)), 3, "D");
    boolean seenDogs = false;
    CharTermAttribute termAtt = nptf.getAttribute(CharTermAttribute.class);
    TypeAttribute typeAtt = nptf.getAttribute(TypeAttribute.class);
    PayloadAttribute payloadAtt = nptf.getAttribute(PayloadAttribute.class);
    nptf.reset();
    while (nptf.incrementToken()) {
      if (termAtt.toString().equals("dogs")) {
        seenDogs = true;
        assertTrue(typeAtt.type() + " is not equal to " + "D", typeAtt.type().equals("D") == true);
        assertTrue("payloadAtt.getPayload() is null and it shouldn't be", payloadAtt.getPayload() != null);
        byte [] bytes = payloadAtt.getPayload().getData();//safe here to just use the bytes, otherwise we should use offset, length
        assertTrue(bytes.length + " does not equal: " + payloadAtt.getPayload().length(), bytes.length == payloadAtt.getPayload().length());
        assertTrue(payloadAtt.getPayload().getOffset() + " does not equal: " + 0, payloadAtt.getPayload().getOffset() == 0);
        float pay = PayloadHelper.decodeFloat(bytes);
        assertTrue(pay + " does not equal: " + 3, pay == 3);
      } else {
        assertTrue(typeAtt.type() + " is not null and it should be", typeAtt.type().equals("word"));
      }
    }
    assertTrue(seenDogs + " does not equal: " + true, seenDogs == true);
  }

  private final class WordTokenFilter extends TokenFilter {
    private final CharTermAttribute termAtt = addAttribute(CharTermAttribute.class);
    private final TypeAttribute typeAtt = addAttribute(TypeAttribute.class);
    
    private WordTokenFilter(TokenStream input) {
      super(input);
    }
    
    @Override
    public boolean incrementToken() throws IOException {
      if (input.incrementToken()) {
        if (termAtt.toString().equals("dogs"))
          typeAtt.setType("D");
        return true;
      } else {
        return false;
      }
    }
  }

}

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