Examples of edu.buffalo.cse.ir.wikiindexer.tokenizer.TokenStream.previous()

Package edu.buffalo.cse.ir.wikiindexer.tokenizer

Class edu.buffalo.cse.ir.wikiindexer.tokenizer.TokenStream

Examples of edu.buffalo.cse.ir.wikiindexer.tokenizer.TokenStream.previous()

edu.buffalo.cse.ir.wikiindexer.tokenizer.TokenStream.previous()
Iterator method: Method to get the previous token from the stream Callers must call the set method to modify the token, changing the value of the token returned by this method must not alter the stream @return The next token from the stream, null if at the end

    stream = new TokenStream("this");
    stream.append("is","a","test","stream");
    stream.mergeWithNext();
    assertNull(stream.previous());
    stream.next();
    assertEquals("this is", stream.previous());
    stream = null;
  }


  /**
   * Test method for {@link edu.buffalo.cse.ir.wikiindexer.tokenizer.TokenStream#remove()}.

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    stream.append("is","a","test","stream");
    assertFalse(stream.mergeWithPrevious());
    
    //proper merge
    stream.seekEnd();
    stream.previous();
    assertTrue(stream.mergeWithPrevious());
    assertEquals("test stream", stream.next());
    assertEquals(4, stream.getAllTokens().size());
    stream = null;

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    //full merge - reverse
    stream = new TokenStream("this");
    stream.append("is","a","test","stream");
    stream.seekEnd();
    stream.previous();
    assertTrue(stream.mergeWithPrevious());
    assertEquals("test stream", stream.next());
    stream.previous();
    assertTrue(stream.mergeWithPrevious());
    assertEquals("a test stream", stream.next());

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    stream.append("is","a","test","stream");
    stream.seekEnd();
    stream.previous();
    assertTrue(stream.mergeWithPrevious());
    assertEquals("test stream", stream.next());
    stream.previous();
    assertTrue(stream.mergeWithPrevious());
    assertEquals("a test stream", stream.next());
    stream.previous();
    assertTrue(stream.mergeWithPrevious());
    assertEquals("is a test stream", stream.next());

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    assertTrue(stream.mergeWithPrevious());
    assertEquals("test stream", stream.next());
    stream.previous();
    assertTrue(stream.mergeWithPrevious());
    assertEquals("a test stream", stream.next());
    stream.previous();
    assertTrue(stream.mergeWithPrevious());
    assertEquals("is a test stream", stream.next());
    stream.previous();
    assertTrue(stream.mergeWithPrevious());
    assertEquals("this is a test stream", stream.next());

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    assertTrue(stream.mergeWithPrevious());
    assertEquals("a test stream", stream.next());
    stream.previous();
    assertTrue(stream.mergeWithPrevious());
    assertEquals("is a test stream", stream.next());
    stream.previous();
    assertTrue(stream.mergeWithPrevious());
    assertEquals("this is a test stream", stream.next());
    stream.previous();
    assertFalse(stream.mergeWithPrevious());
    stream = null;

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    assertTrue(stream.mergeWithPrevious());
    assertEquals("is a test stream", stream.next());
    stream.previous();
    assertTrue(stream.mergeWithPrevious());
    assertEquals("this is a test stream", stream.next());
    stream.previous();
    assertFalse(stream.mergeWithPrevious());
    stream = null;
    
    //full merge - forward
    stream = new TokenStream("this");

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    //full merge - reverse
    stream = new TokenStream("this");
    stream.append("is","a","test","stream");
    stream.seekEnd();
    stream.previous();
    stream.previous();
    assertTrue(stream.mergeWithNext());
    assertEquals("test stream", stream.next());
    stream.previous();
    stream.previous();

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    //full merge - reverse
    stream = new TokenStream("this");
    stream.append("is","a","test","stream");
    stream.seekEnd();
    stream.previous();
    stream.previous();
    assertTrue(stream.mergeWithNext());
    assertEquals("test stream", stream.next());
    stream.previous();
    stream.previous();
    assertTrue(stream.mergeWithNext());

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    stream.seekEnd();
    stream.previous();
    stream.previous();
    assertTrue(stream.mergeWithNext());
    assertEquals("test stream", stream.next());
    stream.previous();
    stream.previous();
    assertTrue(stream.mergeWithNext());
    assertEquals("a test stream", stream.next());
    stream.previous();
    stream.previous();

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