lucene/analysis/common/src/test/org/apache/lucene/analysis/core/TestUnicodeWhitespaceTokenizer.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
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package org.apache.lucene.analysis.core;


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

import org.apache.lucene.analysis.BaseTokenStreamTestCase;
import org.apache.lucene.analysis.Tokenizer;
import org.apache.lucene.util.AttributeFactory;

public class TestUnicodeWhitespaceTokenizer extends BaseTokenStreamTestCase {
  
  // clone of test from WhitespaceTokenizer
  public void testSimple() throws IOException {
    StringReader reader = new StringReader("Tokenizer \ud801\udc1ctest");
    UnicodeWhitespaceTokenizer tokenizer = new UnicodeWhitespaceTokenizer();
    tokenizer.setReader(reader);
    assertTokenStreamContents(tokenizer, new String[] { "Tokenizer",
        "\ud801\udc1ctest" });
  }
  
  public void testNBSP() throws IOException {
    StringReader reader = new StringReader("Tokenizer\u00A0test");
    UnicodeWhitespaceTokenizer tokenizer = new UnicodeWhitespaceTokenizer();
    tokenizer.setReader(reader);
    assertTokenStreamContents(tokenizer, new String[] { "Tokenizer",
        "test" });
  }

  public void testFactory() {
    Map<String, String> args = new HashMap<>();
    args.put("rule", "unicode");
    WhitespaceTokenizerFactory factory = new WhitespaceTokenizerFactory(args);
    AttributeFactory attributeFactory = newAttributeFactory();
    Tokenizer tokenizer = factory.create(attributeFactory);
    assertEquals(UnicodeWhitespaceTokenizer.class, tokenizer.getClass());
  }

  private Map<String, String> makeArgs(String... args) {
    Map<String, String> ret = new HashMap<>();
    for (int idx = 0; idx < args.length; idx += 2) {
      ret.put(args[idx], args[idx + 1]);
    }
    return ret;
  }

  public void testParamsFactory() throws IOException {
    

    // negative maxTokenLen
    IllegalArgumentException iae = expectThrows(IllegalArgumentException.class, () ->
        new WhitespaceTokenizerFactory(makeArgs("rule", "unicode", "maxTokenLen", "-1")));
    assertEquals("maxTokenLen must be greater than 0 and less than 1048576 passed: -1", iae.getMessage());

    // zero maxTokenLen
    iae = expectThrows(IllegalArgumentException.class, () ->
        new WhitespaceTokenizerFactory(makeArgs("rule", "unicode", "maxTokenLen", "0")));
    assertEquals("maxTokenLen must be greater than 0 and less than 1048576 passed: 0", iae.getMessage());

    // Added random param, should throw illegal error
    iae = expectThrows(IllegalArgumentException.class, () ->
        new WhitespaceTokenizerFactory(makeArgs("rule", "unicode", "maxTokenLen", "255", "randomParam", "rValue")));
    assertEquals("Unknown parameters: {randomParam=rValue}", iae.getMessage());

    // tokeniser will split at 5, Token | izer, no matter what happens 
    WhitespaceTokenizerFactory factory = new WhitespaceTokenizerFactory(makeArgs("rule", "unicode", "maxTokenLen", "5"));
    AttributeFactory attributeFactory = newAttributeFactory();
    Tokenizer tokenizer = factory.create(attributeFactory);
    StringReader reader = new StringReader("Tokenizer \ud801\udc1ctest");
    tokenizer.setReader(reader);
    assertTokenStreamContents(tokenizer, new String[]{"Token", "izer", "\ud801\udc1ctes", "t"});

    // tokeniser will split at 2, To | ke | ni | ze | r, no matter what happens 
    factory = new WhitespaceTokenizerFactory(makeArgs("rule", "unicode", "maxTokenLen", "2"));
    attributeFactory = newAttributeFactory();
    tokenizer = factory.create(attributeFactory);
    reader = new StringReader("Tokenizer\u00A0test");
    tokenizer.setReader(reader);
    assertTokenStreamContents(tokenizer, new String[]{"To", "ke", "ni", "ze", "r", "te", "st"});

    // tokeniser will split at 10, no matter what happens, 
    // but tokens' length are less than that
    factory = new WhitespaceTokenizerFactory(makeArgs("rule", "unicode", "maxTokenLen", "10"));
    attributeFactory = newAttributeFactory();
    tokenizer = factory.create(attributeFactory);
    reader = new StringReader("Tokenizer\u00A0test");
    tokenizer.setReader(reader);
    assertTokenStreamContents(tokenizer, new String[]{"Tokenizer", "test"});
  }
}