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("to");
    stream.append("be", "or", "not", "to", "be");
    stream.mergeWithNext();
    stream.seekEnd();
    stream.previous();
    stream.previous();
    stream.mergeWithNext();
    smap = getSortedMap(stream.getTokenMap());
    assertEquals("[not, or, to be]", smap.keySet().toString());
    assertEquals("[1, 1, 2]", smap.values().toString());
    stream = null;

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    stream.append("is","a","test","stream");
    while (stream.hasNext()) {
      stream.next();
    }
    
    stream.previous();
    assertTrue(stream.hasNext());
    stream.next();
    assertFalse(stream.hasNext());
    stream = null;

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    //with remove
    stream = new TokenStream("this");
    stream.append("is","a","test","stream");
    stream.seekEnd();
    stream.previous();
    stream.remove();
    assertFalse(stream.hasNext());
    stream = null;
    
    //with merge with previous

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    stream.append("is","a","test","stream");
    stream.next();
    stream.mergeWithPrevious();
    assertTrue(stream.hasNext());
    stream.seekEnd();
    stream.previous();
    stream.mergeWithPrevious();
    assertTrue(stream.hasNext());
    stream = null;
    
    //with merge with next

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    stream = new TokenStream("this");
    stream.append("is","a","test","stream");
    stream.mergeWithNext();
    assertTrue(stream.hasNext());
    stream.seekEnd();
    stream.previous();
    stream.previous();
    stream.mergeWithNext();
    stream.next();
    assertFalse(stream.hasNext());
    stream = null;

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    stream.append("is","a","test","stream");
    stream.mergeWithNext();
    assertTrue(stream.hasNext());
    stream.seekEnd();
    stream.previous();
    stream.previous();
    stream.mergeWithNext();
    stream.next();
    assertFalse(stream.hasNext());
    stream = null;
  }

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    stream = new TokenStream("this");
    stream.append("is","a","test","stream");
    assertFalse(stream.hasPrevious()); //start of stream
    stream.seekEnd();
    assertTrue(stream.hasPrevious()); 
    stream.previous(); //after this
    assertTrue(stream.hasPrevious()); 
    stream.previous(); //after is
    assertTrue(stream.hasPrevious()); 
    stream.previous(); //after a
    assertTrue(stream.hasPrevious());

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    assertFalse(stream.hasPrevious()); //start of stream
    stream.seekEnd();
    assertTrue(stream.hasPrevious()); 
    stream.previous(); //after this
    assertTrue(stream.hasPrevious()); 
    stream.previous(); //after is
    assertTrue(stream.hasPrevious()); 
    stream.previous(); //after a
    assertTrue(stream.hasPrevious()); 
    stream.previous(); //after test
    assertTrue(stream.hasPrevious());

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    assertTrue(stream.hasPrevious()); 
    stream.previous(); //after this
    assertTrue(stream.hasPrevious()); 
    stream.previous(); //after is
    assertTrue(stream.hasPrevious()); 
    stream.previous(); //after a
    assertTrue(stream.hasPrevious()); 
    stream.previous(); //after test
    assertTrue(stream.hasPrevious()); 
    stream.previous(); //after stream
    assertFalse(stream.hasPrevious());

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    assertTrue(stream.hasPrevious()); 
    stream.previous(); //after is
    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;

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