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From "Danish Contractor (JIRA)" <j...@apache.org>
Subject [jira] Created: (LUCENE-2028) FilteredTermEnum.Java - The first term in the enumeration is skipped.
Date Wed, 04 Nov 2009 15:09:32 GMT
FilteredTermEnum.Java - The first term in the enumeration is skipped.
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                 Key: LUCENE-2028
                 URL: https://issues.apache.org/jira/browse/LUCENE-2028
             Project: Lucene - Java
          Issue Type: Bug
          Components: Search
    Affects Versions: 2.4.1
         Environment: JDK 1.6 
            Reporter: Danish Contractor


The Filtered Term Enumeration seems to skip the first term present in the enumerator. 
The problem lies in the next() function, which moves does not do anything with the first value
of currentTerm set by the setEnum() method.

The setEnum() function sets a value to the currentTerm and returns. An implementation of WildCardTermEnum,
for example calls the next() method where the currentTerm is set to null and the enumerator
moves to the next value. The first term is not read.

In my local workspace, I have modified the two methods - setEnum() and next() as follows:

protected void setEnum(TermEnum actualEnum) throws IOException {
        this.actualEnum = actualEnum;
        this.startedReading=false;
        // Find the first term that matches
        Term term = actualEnum.term();
        if (term != null && termCompare(term)) 
            currentTerm = term;
        else next();
    }

/** Increments the enumeration to the next element.  True if one exists. */
    public boolean next() throws IOException {
        if (actualEnum == null) return false; // the actual enumerator is not initialized!
        if(currentTerm!=null &&!startedReading) //check if first term read
        {
        	startedReading=true;
        	return true;
        }
        currentTerm = null;
        while (currentTerm == null) {
            if (endEnum()) return false;
            if (actualEnum.next()) {
                Term term = actualEnum.term();
                if (termCompare(term)) {
                    currentTerm = term;
                    return true;
                }
            }
            else return false;
        }
        currentTerm = null;
        return false;
    }

I have added a boolean variable called startedReading that is a member of the FilteredTermEnum
class and is set to false. Once the currentTerm set by setEnum is read, I set this value to
true and the code continues as before.

I have run a few of my own test cases and it returns the results  I was looking for which
were missing earlier as they happened to be the first term in the enumerator.


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