Lucene example source code file (TestCharTermAttributeImpl.java)

This example Lucene source code file (TestCharTermAttributeImpl.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

charbuffer, charsequence, chartermattributeimpl, chartermattributeimpl, exception, formatter, indexoutofboundsexception, indexoutofboundsexception, io, nio, regex, should, should, string, stringbuffer, stringbuilder, stringbuilder, util

The Lucene TestCharTermAttributeImpl.java source code

package org.apache.lucene.analysis.tokenattributes;

/**
 * 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.util.LuceneTestCase;
import org.apache.lucene.util._TestUtil;
import java.nio.CharBuffer;
import java.util.Collections;
import java.util.Formatter;
import java.util.Locale;
import java.util.regex.Pattern;

public class TestCharTermAttributeImpl extends LuceneTestCase {

  public void testResize() {
    CharTermAttributeImpl t = new CharTermAttributeImpl();
    char[] content = "hello".toCharArray();
    t.copyBuffer(content, 0, content.length);
    for (int i = 0; i < 2000; i++)
    {
      t.resizeBuffer(i);
      assertTrue(i <= t.buffer().length);
      assertEquals("hello", t.toString());
    }
  }

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

    // now as a StringBuilder, first variant
    t = new CharTermAttributeImpl();
    buf = new StringBuilder("ab");
    for (int i = 0; i < 20; i++)
    {
      t.setEmpty().append(buf);
      assertEquals(buf.length(), t.length());
      assertEquals(buf.toString(), t.toString());
      buf.append(t);
    }
    assertEquals(1048576, t.length());

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

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

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

  public void testClone() throws Exception {
    CharTermAttributeImpl t = new CharTermAttributeImpl();
    char[] content = "hello".toCharArray();
    t.copyBuffer(content, 0, 5);
    char[] buf = t.buffer();
    CharTermAttributeImpl copy = (CharTermAttributeImpl) TestSimpleAttributeImpls.assertCloneIsEqual(t);
    assertEquals(t.toString(), copy.toString());
    assertNotSame(buf, copy.buffer());
  }
  
  public void testEquals() throws Exception {
    CharTermAttributeImpl t1a = new CharTermAttributeImpl();
    char[] content1a = "hello".toCharArray();
    t1a.copyBuffer(content1a, 0, 5);
    CharTermAttributeImpl t1b = new CharTermAttributeImpl();
    char[] content1b = "hello".toCharArray();
    t1b.copyBuffer(content1b, 0, 5);
    CharTermAttributeImpl t2 = new CharTermAttributeImpl();
    char[] content2 = "hello2".toCharArray();
    t2.copyBuffer(content2, 0, 6);
    assertTrue(t1a.equals(t1b));
    assertFalse(t1a.equals(t2));
    assertFalse(t2.equals(t1b));
  }
  
  public void testCopyTo() throws Exception {
    CharTermAttributeImpl t = new CharTermAttributeImpl();
    CharTermAttributeImpl copy = (CharTermAttributeImpl) TestSimpleAttributeImpls.assertCopyIsEqual(t);
    assertEquals("", t.toString());
    assertEquals("", copy.toString());

    t = new CharTermAttributeImpl();
    char[] content = "hello".toCharArray();
    t.copyBuffer(content, 0, 5);
    char[] buf = t.buffer();
    copy = (CharTermAttributeImpl) TestSimpleAttributeImpls.assertCopyIsEqual(t);
    assertEquals(t.toString(), copy.toString());
    assertNotSame(buf, copy.buffer());
  }
  
  public void testAttributeReflection() throws Exception {
    CharTermAttributeImpl t = new CharTermAttributeImpl();
    t.append("foobar");
    _TestUtil.assertAttributeReflection(t,
      Collections.singletonMap(CharTermAttribute.class.getName() + "#term", "foobar"));
  }
  
  public void testCharSequenceInterface() {
    final String s = "0123456789"; 
    final CharTermAttributeImpl t = new CharTermAttributeImpl();
    t.append(s);
    
    assertEquals(s.length(), t.length());
    assertEquals("12", t.subSequence(1,3).toString());
    assertEquals(s, t.subSequence(0,s.length()).toString());
    
    assertTrue(Pattern.matches("01\\d+", t));
    assertTrue(Pattern.matches("34", t.subSequence(3,5)));
    
    assertEquals(s.subSequence(3,7).toString(), t.subSequence(3,7).toString());
    
    for (int i = 0; i < s.length(); i++) {
      assertTrue(t.charAt(i) == s.charAt(i));
    }
  }

  public void testAppendableInterface() {
    CharTermAttributeImpl t = new CharTermAttributeImpl();
    Formatter formatter = new Formatter(t, Locale.US);
    formatter.format("%d", 1234);
    assertEquals("1234", t.toString());
    formatter.format("%d", 5678);
    assertEquals("12345678", t.toString());
    t.append('9');
    assertEquals("123456789", t.toString());
    t.append((CharSequence) "0");
    assertEquals("1234567890", t.toString());
    t.append((CharSequence) "0123456789", 1, 3);
    assertEquals("123456789012", t.toString());
    t.append((CharSequence) CharBuffer.wrap("0123456789".toCharArray()), 3, 5);
    assertEquals("12345678901234", t.toString());
    t.append((CharSequence) t);
    assertEquals("1234567890123412345678901234", t.toString());
    t.append((CharSequence) new StringBuilder("0123456789"), 5, 7);
    assertEquals("123456789012341234567890123456", t.toString());
    t.append((CharSequence) new StringBuffer(t));
    assertEquals("123456789012341234567890123456123456789012341234567890123456", t.toString());
    // very wierd, to test if a subSlice is wrapped correct :)
    CharBuffer buf = CharBuffer.wrap("0123456789".toCharArray(), 3, 5);
    assertEquals("34567", buf.toString());
    t.setEmpty().append((CharSequence) buf, 1, 2);
    assertEquals("4", t.toString());
    CharTermAttribute t2 = new CharTermAttributeImpl();
    t2.append("test");
    t.append((CharSequence) t2);
    assertEquals("4test", t.toString());
    t.append((CharSequence) t2, 1, 2);
    assertEquals("4teste", t.toString());
    
    try {
      t.append((CharSequence) t2, 1, 5);
      fail("Should throw IndexOutOfBoundsException");
    } catch(IndexOutOfBoundsException iobe) {
    }
    
    try {
      t.append((CharSequence) t2, 1, 0);
      fail("Should throw IndexOutOfBoundsException");
    } catch(IndexOutOfBoundsException iobe) {
    }
    
    t.append((CharSequence) null);
    assertEquals("4testenull", t.toString());
  }
  
  public void testAppendableInterfaceWithLongSequences() {
    CharTermAttributeImpl t = new CharTermAttributeImpl();
    t.append((CharSequence) "01234567890123456789012345678901234567890123456789");
    t.append((CharSequence) CharBuffer.wrap("01234567890123456789012345678901234567890123456789".toCharArray()), 3, 50);
    assertEquals("0123456789012345678901234567890123456789012345678934567890123456789012345678901234567890123456789", t.toString());
    t.setEmpty().append((CharSequence) new StringBuilder("01234567890123456789"), 5, 17);
    assertEquals((CharSequence) "567890123456", t.toString());
    t.append(new StringBuffer(t));
    assertEquals((CharSequence) "567890123456567890123456", t.toString());
    // very wierd, to test if a subSlice is wrapped correct :)
    CharBuffer buf = CharBuffer.wrap("012345678901234567890123456789".toCharArray(), 3, 15);
    assertEquals("345678901234567", buf.toString());
    t.setEmpty().append(buf, 1, 14);
    assertEquals("4567890123456", t.toString());
    
    // finally use a completely custom CharSequence that is not catched by instanceof checks
    final String longTestString = "012345678901234567890123456789";
    t.append(new CharSequence() {
      public char charAt(int i) { return longTestString.charAt(i); }
      public int length() { return longTestString.length(); }
      public CharSequence subSequence(int start, int end) { return longTestString.subSequence(start, end); }
      @Override
      public String toString() { return longTestString; }
    });
    assertEquals("4567890123456"+longTestString, t.toString());
  }
  
  public void testNonCharSequenceAppend() {
    CharTermAttributeImpl t = new CharTermAttributeImpl();
    t.append("0123456789");
    t.append("0123456789");
    assertEquals("01234567890123456789", t.toString());
    t.append(new StringBuilder("0123456789"));
    assertEquals("012345678901234567890123456789", t.toString());
    CharTermAttribute t2 = new CharTermAttributeImpl();
    t2.append("test");
    t.append(t2);
    assertEquals("012345678901234567890123456789test", t.toString());
    t.append((String) null);
    t.append((StringBuilder) null);
    t.append((CharTermAttribute) null);
    assertEquals("012345678901234567890123456789testnullnullnull", t.toString());
  }
  
  public void testExceptions() {
    CharTermAttributeImpl t = new CharTermAttributeImpl();
    t.append("test");
    assertEquals("test", t.toString());

    try {
      t.charAt(-1);
      fail("Should throw IndexOutOfBoundsException");
    } catch(IndexOutOfBoundsException iobe) {
    }

    try {
      t.charAt(4);
      fail("Should throw IndexOutOfBoundsException");
    } catch(IndexOutOfBoundsException iobe) {
    }

    try {
      t.subSequence(0, 5);
      fail("Should throw IndexOutOfBoundsException");
    } catch(IndexOutOfBoundsException iobe) {
    }

    try {
      t.subSequence(5, 0);
      fail("Should throw IndexOutOfBoundsException");
    } catch(IndexOutOfBoundsException iobe) {
    }
  }

  /*
  
  // test speed of the dynamic instanceof checks in append(CharSequence),
  // to find the best max length for the generic while (start<end) loop:
  public void testAppendPerf() {
    CharTermAttributeImpl t = new CharTermAttributeImpl();
    final int count = 32;
    CharSequence[] csq = new CharSequence[count * 6];
    final StringBuilder sb = new StringBuilder();
    for (int i=0,j=0; i<count; i++) {
      sb.append(i%10);
      final String testString = sb.toString();
      CharTermAttribute cta = new CharTermAttributeImpl();
      cta.append(testString);
      csq[j++] = cta;
      csq[j++] = testString;
      csq[j++] = new StringBuilder(sb);
      csq[j++] = new StringBuffer(sb);
      csq[j++] = CharBuffer.wrap(testString.toCharArray());
      csq[j++] = new CharSequence() {
        public char charAt(int i) { return testString.charAt(i); }
        public int length() { return testString.length(); }
        public CharSequence subSequence(int start, int end) { return testString.subSequence(start, end); }
        public String toString() { return testString; }
      };
    }

    Random rnd = newRandom();
    long startTime = System.currentTimeMillis();
    for (int i=0; i<100000000; i++) {
      t.setEmpty().append(csq[rnd.nextInt(csq.length)]);
    }
    long endTime = System.currentTimeMillis();
    System.out.println("Time: " + (endTime-startTime)/1000.0 + " s");
  }
  
  */

}