Apache
/
lucene
mirror of https://github.com/apache/lucene.git
1
0
Fork 0
Code Issues Packages Projects Releases Wiki Activity

some corrections for flex migration, thanks to Andi Vajda 

git-svn-id: https://svn.apache.org/repos/asf/lucene/dev/trunk@962851 13f79535-47bb-0310-9956-ffa450edef68
This commit is contained in:
Michael McCandless 2010-07-10 14:43:37 +00:00
parent 38672332d5
commit 9cfb3be57f
1 changed files with 56 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

57
lucene/MIGRATE.txt
View File

@ -22,11 +22,42 @@ LUCENE-2380: FieldCache.getStrings/Index --> FieldCache.getDocTerms/Index
DocTerms values = FieldCache.DEFAULT.getTerms(reader, field);
...
BytesRef term = new BytesRef();
String aValue = values.get(docID, term).utf8ToString();
String aValue = values.getTerm(docID, term).utf8ToString();
Note however that it can be costly to convert to String, so it's
better to work directly with the BytesRef.
* Similarly, in FieldCache, getStringIndex (returning a StringIndex
instance, with direct arrays int[] order and String[] lookup) has
been replaced with getTermsIndex (returning a
FieldCache.DocTermsIndex instance). DocTermsIndex provides the
getOrd(int docID) method to lookup the int order for a document,
lookup(int ord, BytesRef reuse) to lookup the term from a given
order, and the sugar method getTerm(int docID, BytesRef reuse)
which internally calls getOrd and then lookup.
If you had code like this before:
StringIndex idx = FieldCache.DEFAULT.getStringIndex(reader, field);
...
int ord = idx.order[docID];
String aValue = idx.lookup[ord];
you can do this instead:
DocTermsIndex idx = FieldCache.DEFAULT.getTermsIndex(reader, field);
...
int ord = idx.getOrd(docID);
BytesRef term = new BytesRef();
String aValue = idx.lookup(ord, term).utf8ToString();
Note however that it can be costly to convert to String, so it's
better to work directly with the BytesRef.
DocTermsIndex also has a getTermsEnum() method, which returns an
iterator (TermsEnum) over the term values in the index (ie,
iterates ord = 0..numOrd()-1).
* StringComparatorLocale is now more CPU costly than it was before
(it was already very CPU costly since it does not compare using
indexed collation keys; use CollationKeyFilter for better
@ -101,6 +132,30 @@ LUCENE-1458, LUCENE-2111: Flexible Indexing
...
}
The bulk read API has also changed. Instead of this:
int[] docs = new int[256];
int[] freqs = new int[256];
while(true) {
int count = td.read(docs, freqs)
if (count == 0) {
break;
}
// use docs[i], freqs[i]
}
do this:
DocsEnum.BulkReadResult bulk = td.getBulkResult();
while(true) {
int count = td.read();
if (count == 0) {
break;
}
// use bulk.docs.ints[i] and bulk.freqs.ints[i]
}
* TermPositions is renamed to DocsAndPositionsEnum, and no longer
extends the docs only enumerator (DocsEnum).