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

    assertTrue(stream.hasPrevious()); 
    stream.previous(); //after a
    assertTrue(stream.hasPrevious()); 
    stream.previous(); //after test
    assertTrue(stream.hasPrevious()); 
    stream.previous(); //after stream
    assertFalse(stream.hasPrevious());
    stream = null;
    
    //with seek
    stream = new TokenStream("this");

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    //forward and reverse
    stream = new TokenStream("this");
    stream.append("is","a","test","stream");
    stream.next();
    assertTrue(stream.hasPrevious());
    stream.previous();
    assertFalse(stream.hasPrevious());
    stream = null;
    
    //with remove
    stream = new TokenStream("this");

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    //fwd and reverse
    stream = new TokenStream("this");
    stream.append("is","a","test","stream");
    assertEquals("this", stream.next());
    stream.previous();
    assertEquals("this", stream.next());
    assertEquals("is", stream.next());
    assertEquals("a", stream.next());
    stream.reset();
    assertEquals("this", stream.next());

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   */
  @Test
  public void testPrevious() {
    //null
    TokenStream stream = new TokenStream((String) null);
    assertNull(stream.previous());
    stream = null;
    
    //empty str
    stream = new TokenStream("");
    assertNull(stream.previous());

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    assertNull(stream.previous());
    stream = null;
    
    //empty str
    stream = new TokenStream("");
    assertNull(stream.previous());
    stream = null;
    
    //reverse iteration
    stream = new TokenStream("this");
    stream.append("is","a","test","stream");

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    //reverse iteration
    stream = new TokenStream("this");
    stream.append("is","a","test","stream");
    stream.seekEnd();
    assertEquals("stream", stream.previous());
    assertEquals("test", stream.previous());
    assertEquals("a", stream.previous());
    assertEquals("is", stream.previous());
    assertEquals("this", stream.previous());
    assertNull(stream.previous());

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    //reverse iteration
    stream = new TokenStream("this");
    stream.append("is","a","test","stream");
    stream.seekEnd();
    assertEquals("stream", stream.previous());
    assertEquals("test", stream.previous());
    assertEquals("a", stream.previous());
    assertEquals("is", stream.previous());
    assertEquals("this", stream.previous());
    assertNull(stream.previous());
    stream = null;

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

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    stream.append("is","a","test","stream");
    stream.seekEnd();
    assertEquals("stream", stream.previous());
    assertEquals("test", stream.previous());
    assertEquals("a", stream.previous());
    assertEquals("is", stream.previous());
    assertEquals("this", stream.previous());
    assertNull(stream.previous());
    stream = null;
    
    //fwd and reverse

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    stream.seekEnd();
    assertEquals("stream", stream.previous());
    assertEquals("test", stream.previous());
    assertEquals("a", stream.previous());
    assertEquals("is", stream.previous());
    assertEquals("this", stream.previous());
    assertNull(stream.previous());
    stream = null;
    
    //fwd and reverse
    stream = new TokenStream("this");

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