lucene/analysis/common/src/test/org/apache/lucene/analysis/miscellaneous/TestTruncateTokenFilterFactory.java

/*
 * 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.
 */
package org.apache.lucene.analysis.miscellaneous;

import java.io.Reader;
import java.io.StringReader;
import org.apache.lucene.analysis.BaseTokenStreamFactoryTestCase;
import org.apache.lucene.analysis.MockTokenizer;
import org.apache.lucene.analysis.TokenStream;
import org.apache.lucene.analysis.Tokenizer;

/** Simple tests to ensure the simple truncation filter factory is working. */
public class TestTruncateTokenFilterFactory extends BaseTokenStreamFactoryTestCase {
  /** Ensure the filter actually truncates text. */
  public void testTruncating() throws Exception {
    Reader reader = new StringReader("abcdefg 1234567 ABCDEFG abcde abc 12345 123");
    TokenStream stream = new MockTokenizer(MockTokenizer.WHITESPACE, false);
    ((Tokenizer) stream).setReader(reader);
    stream =
        tokenFilterFactory("Truncate", TruncateTokenFilterFactory.PREFIX_LENGTH_KEY, "5")
            .create(stream);
    assertTokenStreamContents(
        stream, new String[] {"abcde", "12345", "ABCDE", "abcde", "abc", "12345", "123"});
  }

  /** Test that bogus arguments result in exception */
  public void testBogusArguments() throws Exception {
    IllegalArgumentException expected =
        expectThrows(
            IllegalArgumentException.class,
            () -> {
              tokenFilterFactory(
                  "Truncate",
                  TruncateTokenFilterFactory.PREFIX_LENGTH_KEY,
                  "5",
                  "bogusArg",
                  "bogusValue");
            });
    assertTrue(expected.getMessage().contains("Unknown parameter(s):"));
  }

  /** Test that negative prefix length result in exception */
  public void testNonPositivePrefixLengthArgument() throws Exception {
    IllegalArgumentException expected =
        expectThrows(
            IllegalArgumentException.class,
            () -> {
              tokenFilterFactory("Truncate", TruncateTokenFilterFactory.PREFIX_LENGTH_KEY, "-5");
            });
    assertTrue(
        expected
            .getMessage()
            .contains(
                TruncateTokenFilterFactory.PREFIX_LENGTH_KEY
                    + " parameter must be a positive number: -5"));
  }
}