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From Adrien Grand <jpou...@gmail.com>
Subject Re: Implement an IndexSearcher which never returns any documents
Date Mon, 11 Sep 2017 15:55:44 GMT
You could create a `new IndexSearcher(new MultiReader());`

Le sam. 9 sept. 2017 à 19:40, Mitchell Stevenson <
mitchell.stevenson986@gmail.com> 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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