hello
I'm using following code in the startup of my program
String indexDirectory = //some init
try {
if ( !IndexReader.indexExists(indexDirectory)) {
// working index doesn't exist so try to create a dummy index.
IndexWriter iw = new IndexWriter(indexDirectory, new
StandardAnalyzer(), true);
iw.close();
} else {
IndexReader.unlock(FSDirectory.getDirectory(indexDirectory, false));
}
} catch (IOException e) {
// Exception happened when trying to unlock working index
}
regards,
Volodymyr Bychkoviak
Stephane Bailliez wrote:
I have a very stupid question that puzzles me so far in the API. (I'm
using Lucene 1.4.3)
There is a boolean flag over the creation of the Directory which is
basically: use it as is or delete the storage area
Same for the index, the IndexWriter use a flag 'use the existing or
create a new one'.
If you're creating an indexwriter with 'create' set to false. It could
blow up with an IOException because the index does not exist.
But it could also blow up for other reasons with an IOException..which
does not help much in identifying the source problem.
What I would like to is something like: if the index does not exist,
then create one for me, otherwise use it.
I could do that with something like
try {
writer = new IndexWriter(directory, analyzer, false)
} catch (IOException e){
writer = new IndexWriter(directory, analyzer, true);
}
but this is not exactly true, and I could possibly delete an existing
index if an IOException happens which is not due to a non-existing index.
Apparently a way to check there is an existing index would be (based
on the Lucene source code) to do something like:
try {
writer = new IndexWriter(directory, analyzer, false)
} catch (IOException e){
if ( !directory.exists(IndexFileNames.SEGMENTS) ) {
// the index really does not exists, so create it
writer = new IndexWriter(directory, analyzer, true);
} else {
throw e;
}
}
Is this correct or is there something even more simpler that I'm
missing ?
Ideally I would have liked a subclassed IOException on the IndexWriter
to differentiate the cases (like FileNotFoundException for example)
but maybe I'm missing some trivial thing.
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