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

    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");
    stream.append("is","a","test","stream");

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

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

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    stream.append("is","a","test","stream");
    stream.seekEnd();
    assertEquals("stream", stream.previous());
    stream.next();
    assertEquals("stream", stream.previous());
    assertEquals("test", stream.previous());
    assertEquals("a", stream.previous());
    stream.reset();
    assertEquals("this", stream.next());
    stream = null;

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    stream.seekEnd();
    assertEquals("stream", stream.previous());
    stream.next();
    assertEquals("stream", stream.previous());
    assertEquals("test", stream.previous());
    assertEquals("a", stream.previous());
    stream.reset();
    assertEquals("this", stream.next());
    stream = null;
    
    //with remove

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    //with remove
    stream = new TokenStream("this");
    stream.append("is","a","test","stream");
    stream.remove();
    stream.next();
    assertEquals("is", stream.previous());
    stream.next();
    stream.remove();
    assertEquals("is", stream.previous());
    stream = null;

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

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    //with merge with previous
    stream = new TokenStream("this");
    stream.append("is","a","test","stream");
    stream.next();
    stream.mergeWithPrevious();
    assertNull(stream.previous());
    stream.next();
    assertEquals("this is", stream.previous());
    stream = null;
    
    //with merge with next

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    stream.append("is","a","test","stream");
    stream.next();
    stream.mergeWithPrevious();
    assertNull(stream.previous());
    stream.next();
    assertEquals("this is", stream.previous());
    stream = null;
    
    //with merge with next
    stream = new TokenStream("this");
    stream.append("is","a","test","stream");

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

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