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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