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Lucene example source code file (TestToken.java)

This example Lucene source code file (TestToken.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

exception, exception, hashmap, io, override, payload, senselessattribute, senselessattributeimpl, senselessattributeimpl, string, stringbuilder, stringbuilder, testtoken, token, token, util

The Lucene TestToken.java source code

package org.apache.lucene.analysis;

/**
 * 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,
 * 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.index.Payload;
import org.apache.lucene.analysis.tokenattributes.*;
import org.apache.lucene.util.LuceneTestCase;
import org.apache.lucene.util.Attribute;
import org.apache.lucene.util.AttributeImpl;
import org.apache.lucene.util._TestUtil;

import java.io.StringReader;
import java.util.HashMap;

public class TestToken extends LuceneTestCase {

  public void testCtor() throws Exception {
    Token t = new Token();
    char[] content = "hello".toCharArray();
    t.setTermBuffer(content, 0, content.length);
    assertNotSame(t.termBuffer(), content);
    assertEquals(0, t.startOffset());
    assertEquals(0, t.endOffset());
    assertEquals("hello", t.term());
    assertEquals("word", t.type());
    assertEquals(0, t.getFlags());

    t = new Token(6, 22);
    t.setTermBuffer(content, 0, content.length);
    assertEquals("hello", t.term());
    assertEquals("hello", t.toString());
    assertEquals(6, t.startOffset());
    assertEquals(22, t.endOffset());
    assertEquals("word", t.type());
    assertEquals(0, t.getFlags());

    t = new Token(6, 22, 7);
    t.setTermBuffer(content, 0, content.length);
    assertEquals("hello", t.term());
    assertEquals("hello", t.toString());
    assertEquals(6, t.startOffset());
    assertEquals(22, t.endOffset());
    assertEquals("word", t.type());
    assertEquals(7, t.getFlags());

    t = new Token(6, 22, "junk");
    t.setTermBuffer(content, 0, content.length);
    assertEquals("hello", t.term());
    assertEquals("hello", t.toString());
    assertEquals(6, t.startOffset());
    assertEquals(22, t.endOffset());
    assertEquals("junk", t.type());
    assertEquals(0, t.getFlags());
  }

  public void testResize() {
    Token t = new Token();
    char[] content = "hello".toCharArray();
    t.setTermBuffer(content, 0, content.length);
    for (int i = 0; i < 2000; i++)
    {
      t.resizeTermBuffer(i);
      assertTrue(i <= t.termBuffer().length);
      assertEquals("hello", t.term());
    }
  }

  public void testGrow() {
    Token t = new Token();
    StringBuilder buf = new StringBuilder("ab");
    for (int i = 0; i < 20; i++)
    {
      char[] content = buf.toString().toCharArray();
      t.setTermBuffer(content, 0, content.length);
      assertEquals(buf.length(), t.termLength());
      assertEquals(buf.toString(), t.term());
      buf.append(buf.toString());
    }
    assertEquals(1048576, t.termLength());

    // now as a string, first variant
    t = new Token();
    buf = new StringBuilder("ab");
    for (int i = 0; i < 20; i++)
    {
      String content = buf.toString();
      t.setTermBuffer(content, 0, content.length());
      assertEquals(content.length(), t.termLength());
      assertEquals(content, t.term());
      buf.append(content);
    }
    assertEquals(1048576, t.termLength());

    // now as a string, second variant
    t = new Token();
    buf = new StringBuilder("ab");
    for (int i = 0; i < 20; i++)
    {
      String content = buf.toString();
      t.setTermBuffer(content);
      assertEquals(content.length(), t.termLength());
      assertEquals(content, t.term());
      buf.append(content);
    }
    assertEquals(1048576, t.termLength());

    // Test for slow growth to a long term
    t = new Token();
    buf = new StringBuilder("a");
    for (int i = 0; i < 20000; i++)
    {
      String content = buf.toString();
      t.setTermBuffer(content);
      assertEquals(content.length(), t.termLength());
      assertEquals(content, t.term());
      buf.append("a");
    }
    assertEquals(20000, t.termLength());

    // Test for slow growth to a long term
    t = new Token();
    buf = new StringBuilder("a");
    for (int i = 0; i < 20000; i++)
    {
      String content = buf.toString();
      t.setTermBuffer(content);
      assertEquals(content.length(), t.termLength());
      assertEquals(content, t.term());
      buf.append("a");
    }
    assertEquals(20000, t.termLength());
  }

  public void testToString() throws Exception {
    char[] b = {'a', 'l', 'o', 'h', 'a'};
    Token t = new Token("", 0, 5);
    t.setTermBuffer(b, 0, 5);
    assertEquals("aloha", t.toString());

    t.setTermBuffer("hi there");
    assertEquals("hi there", t.toString());
  }

  public void testTermBufferEquals() throws Exception {
    Token t1a = new Token();
    char[] content1a = "hello".toCharArray();
    t1a.setTermBuffer(content1a, 0, 5);
    Token t1b = new Token();
    char[] content1b = "hello".toCharArray();
    t1b.setTermBuffer(content1b, 0, 5);
    Token t2 = new Token();
    char[] content2 = "hello2".toCharArray();
    t2.setTermBuffer(content2, 0, 6);
    assertTrue(t1a.equals(t1b));
    assertFalse(t1a.equals(t2));
    assertFalse(t2.equals(t1b));
  }
  
  public void testMixedStringArray() throws Exception {
    Token t = new Token("hello", 0, 5);
    assertEquals(t.termLength(), 5);
    assertEquals(t.term(), "hello");
    t.setTermBuffer("hello2");
    assertEquals(t.termLength(), 6);
    assertEquals(t.term(), "hello2");
    t.setTermBuffer("hello3".toCharArray(), 0, 6);
    assertEquals(t.term(), "hello3");

    char[] buffer = t.termBuffer();
    buffer[1] = 'o';
    assertEquals(t.term(), "hollo3");
  }
  
  public void testClone() throws Exception {
    Token t = new Token(0, 5);
    char[] content = "hello".toCharArray();
    t.setTermBuffer(content, 0, 5);
    char[] buf = t.termBuffer();
    Token copy = (Token) TestSimpleAttributeImpls.assertCloneIsEqual(t);
    assertEquals(t.term(), copy.term());
    assertNotSame(buf, copy.termBuffer());

    Payload pl = new Payload(new byte[]{1,2,3,4});
    t.setPayload(pl);
    copy = (Token) TestSimpleAttributeImpls.assertCloneIsEqual(t);
    assertEquals(pl, copy.getPayload());
    assertNotSame(pl, copy.getPayload());
  }
  
  public void testCopyTo() throws Exception {
    Token t = new Token();
    Token copy = (Token) TestSimpleAttributeImpls.assertCopyIsEqual(t);
    assertEquals("", t.term());
    assertEquals("", copy.term());

    t = new Token(0, 5);
    char[] content = "hello".toCharArray();
    t.setTermBuffer(content, 0, 5);
    char[] buf = t.termBuffer();
    copy = (Token) TestSimpleAttributeImpls.assertCopyIsEqual(t);
    assertEquals(t.term(), copy.term());
    assertNotSame(buf, copy.termBuffer());

    Payload pl = new Payload(new byte[]{1,2,3,4});
    t.setPayload(pl);
    copy = (Token) TestSimpleAttributeImpls.assertCopyIsEqual(t);
    assertEquals(pl, copy.getPayload());
    assertNotSame(pl, copy.getPayload());
  }
  
  public interface SenselessAttribute extends Attribute {}
  
  public static final class SenselessAttributeImpl extends AttributeImpl implements SenselessAttribute {
    @Override
    public void copyTo(AttributeImpl target) {}
    @Override
    public void clear() {}
    @Override
    public boolean equals(Object o) { return (o instanceof SenselessAttributeImpl); }
    @Override
    public int hashCode() { return 0; }
  }

  public void testTokenAttributeFactory() throws Exception {
    TokenStream ts = new WhitespaceTokenizer(Token.TOKEN_ATTRIBUTE_FACTORY, new StringReader("foo bar"));
    
    assertTrue("SenselessAttribute is not implemented by SenselessAttributeImpl",
      ts.addAttribute(SenselessAttribute.class) instanceof SenselessAttributeImpl);
    
    assertTrue("CharTermAttribute is not implemented by Token",
      ts.addAttribute(CharTermAttribute.class) instanceof Token);
    assertTrue("OffsetAttribute is not implemented by Token",
      ts.addAttribute(OffsetAttribute.class) instanceof Token);
    assertTrue("FlagsAttribute is not implemented by Token",
      ts.addAttribute(FlagsAttribute.class) instanceof Token);
    assertTrue("PayloadAttribute is not implemented by Token",
      ts.addAttribute(PayloadAttribute.class) instanceof Token);
    assertTrue("PositionIncrementAttribute is not implemented by Token", 
      ts.addAttribute(PositionIncrementAttribute.class) instanceof Token);
    assertTrue("TypeAttribute is not implemented by Token",
      ts.addAttribute(TypeAttribute.class) instanceof Token);
  }

  public void testAttributeReflection() throws Exception {
    Token t = new Token("foobar", 6, 22, 8);
    _TestUtil.assertAttributeReflection(t,
      new HashMap<String,Object>() {{
        put(CharTermAttribute.class.getName() + "#term", "foobar");
        put(OffsetAttribute.class.getName() + "#startOffset", 6);
        put(OffsetAttribute.class.getName() + "#endOffset", 22);
        put(PositionIncrementAttribute.class.getName() + "#positionIncrement", 1);
        put(PayloadAttribute.class.getName() + "#payload", null);
        put(TypeAttribute.class.getName() + "#type", TypeAttribute.DEFAULT_TYPE);
        put(FlagsAttribute.class.getName() + "#flags", 8);
      }});
  }

}

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