You could create a `new IndexSearcher(new MultiReader());`
Le sam. 9 sept. 2017 à 19:40, Mitchell Stevenson <
[email protected]> a écrit :
> I need to implement an IndexSearcher for Lucene 7 which never returns
> any documents.
> Is the following implementation suitable for this? The code seems to
> work nicely but i am not sure about it.
>
> IndexSearcher noDocsSearcher = new IndexSearcher(new NoDocsReader());
>
> public class NoDocsReader extends LeafReader {
>
> private final static Bits liveDocs = new Bits.MatchNoBits(0);
>
> public NoDocsReader() {
> tryIncRef(); //keep reader open
> }
>
> @Override
> public NumericDocValues getNumericDocValues(final String field)
> throws IOException {
> return new NumericDocValues() {
>
> @Override
> public long longValue() throws IOException {
> return 0;
> }
>
> @Override
> public boolean advanceExact(int target) throws IOException {
> return false;
> }
>
> @Override
> public int docID() {
> return 0;
> }
>
> @Override
> public int nextDoc() throws IOException {
> return 0;
> }
>
> @Override
> public int advance(int target) throws IOException {
> return 0;
> }
>
> @Override
> public long cost() {
> return 0;
> }
> };
> }
>
> @Override
> public BinaryDocValues getBinaryDocValues(final String field)
> throws IOException {
> return null;
> }
>
> @Override
> public SortedDocValues getSortedDocValues(final String field)
> throws IOException {
> return null;
> }
>
> @Override
> public SortedNumericDocValues getSortedNumericDocValues(final
> String field) throws IOException {
> return null;
> }
>
> @Override
> public SortedSetDocValues getSortedSetDocValues(final String
> field) throws IOException {
> return null;
> }
>
> @Override
> public NumericDocValues getNormValues(final String field) throws
> IOException {
> return null;
> }
>
> @Override
> public FieldInfos getFieldInfos() {
> return new FieldInfos(new FieldInfo[0]);
> }
>
> @Override
> public Bits getLiveDocs() {
> return liveDocs;
> }
>
> @Override
> public void checkIntegrity() throws IOException {
> }
>
> @Override
> public Fields getTermVectors(final int docID) throws IOException {
> return null;
> }
>
> @Override
> public int numDocs() {
> return 0;
> }
>
> @Override
> public int maxDoc() {
> return 0;
> }
>
> @Override
> public void document(final int docID, final StoredFieldVisitor
> visitor) throws IOException {
> }
>
> @Override
> protected void doClose() throws IOException {
> }
>
> @Override
> public boolean hasDeletions() {
> return false;
> }
>
> @Override
> public CacheHelper getCoreCacheHelper() {
> return null;
> }
>
> @Override
> public Terms terms(String field) throws IOException {
> return null;
> }
>
> @Override
> public PointValues getPointValues(String field) throws IOException {
> return null;
> }
>
> @Override
> public LeafMetaData getMetaData() {
> return null;
> }
>
> @Override
> public CacheHelper getReaderCacheHelper() {
> return null;
> }
> }
>
> Thanks
> Mitch
>
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