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.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();
    assertTrue(stream.mergeWithNext());

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

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

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

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

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

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

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

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

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    //valid posiiton, null or empty tokens
    stream = new TokenStream("this");
    stream.append("is","a","test","stream");
    stream.set((String)null);
    assertEquals("this", stream.next());
    stream.previous();
    stream.set("");
    assertEquals("this", stream.next());
    stream = null;
    
    //valid new token, invalid position

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