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https://issues.apache.org/jira/browse/LUCENE-2028?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Danish Contractor updated LUCENE-2028:
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Attachment: FilteredTermEnum.java
My version of the file.
> FilteredTermEnum.Java - The first term in the enumeration is skipped.
> ---------------------------------------------------------------------
>
> 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
> Attachments: FilteredTermEnum.java
>
> Original Estimate: 0.5h
> Remaining Estimate: 0.5h
>
> 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 next() method as follows:
> /** 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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