Examples of it.unimi.dsi.mg4j.index.Index$EmptyIndexIterator

it.unimi.dsi.mg4j.index.Index
An iterator returning no documents based on this index.
Note that {@link #accept(DocumentIteratorVisitor)} does nothingand returns true, whereas {@link #acceptOnTruePaths(DocumentIteratorVisitor)}throws an {@link IllegalStateException}, {@link #weight()} returns 1and {@link #weight(double)} is a no-op.

          weight = Double.parseDouble( basenameWeight[ i ].substring( split + 1 ) );
        }
        catch( NumberFormatException e ) {}
      }
        
      final Index index;


      if ( split == -1 || basenameWeight[ i ].startsWith("mg4j://") ) {
        index = Index.getInstance( basenameWeight[ i ], true, loadSizes );
        index2Weight.put( index, 1 );
      }

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      throw new QueryBuilderVisitorException( e );
    }
  }
    
  public DocumentIterator visit( Range node ) throws QueryBuilderVisitorException {
    final Index index = curr.top();
    if ( ! index.hasPayloads ) throw new IllegalStateException( "Index " + index + " does not have payloads" );
    try {
      final Object parser = index2Parser.containsKey( index ) ? index2Parser.get( index ) : index.payload;
      final Method method = parser.getClass().getMethod( "parse", String.class );
      final Payload left = index.payload.copy(), right = index.payload.copy();
      if ( node.left != null ) left.set( method.invoke( parser, node.left.toString() ) );
      if ( node.right != null ) right.set( method.invoke( parser, node.right.toString() ) );
      return PayloadPredicateDocumentIterator.getInstance( index.documents( 0 ), 
          index.payload.rangeFilter( node.left == null ? null : left, node.right == null ? null : right ) ).weight( weight() );
    }
    catch( InvocationTargetException e ) {
      throw new QueryBuilderVisitorException( e.getCause() );
    }

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    return result;
  }


  public boolean visitPre( final Select node ) throws QueryBuilderVisitorException {
    if ( indexMap == null ) throw new IllegalArgumentException( "You cannot use Select nodes without an index map" );
    final Index index = indexMap.get( node.index.toString() );
    if ( index == null ) throw new NoSuchElementException( "The selected index (" + node.index + ")" + " does not appear in the index map (" + indexMap + ")" ); 
    curr.push( indexMap.get( node.index.toString() ) );
    return true;
  }

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  public DocumentIterator visitPost( final Remap node, final DocumentIterator subNode ) {
    if ( indexMap == null ) throw new IllegalArgumentException( "You cannot use Remap nodes without an index map" );
    final Reference2ReferenceArrayMap<Index, Index> indexInverseRemapping = new Reference2ReferenceArrayMap<Index, Index>( node.indexInverseRemapping.size() );
    for( Map.Entry<String,String> e: node.indexInverseRemapping.entrySet() ) {
      final Index externalIndex = indexMap.get( e.getKey() );
      final Index internalIndex = indexMap.get( e.getValue() );
      if ( internalIndex == null ) throw new NoSuchElementException( "The internal index \"" + e.getValue() + "\" does not appear in the index map (" + indexMap + ")" ); 
      if ( externalIndex == null ) throw new NoSuchElementException( "The external index \"" + e.getKey() + "\" does not appear in the index map (" + indexMap + ")" ); 
      indexInverseRemapping.put( externalIndex, internalIndex );
    }
    return new RemappingDocumentIterator( subNode, indexInverseRemapping );

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                resultItem.uri = new MutableString( "./Item?doc=" ).append( resultItem.doc ).append( "&m=" ).append( urlEncodedMimeType );
              }
              
              MutableString text = new MutableString();
              for( Iterator<Index> j = indexMap.values().iterator(); j.hasNext(); ) {
                final Index index = j.next();
                selectedInterval = dsi.info.get( index );
                if ( selectedInterval != null )
                  text.append( "<p>" ).append( index.field ).append( ": " ).append( Arrays.asList( selectedInterval ) );
                LOGGER.debug( index.field + ": " + ( selectedInterval == null ? null : Arrays.asList( selectedInterval ) ) ); 
              }

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      totalFrequency += ( frequency[ usedIndex[ k ] ] = indexIterator[ usedIndex[ k ] ].frequency() );


    if ( ! metadataOnly ) {
      int currIndex, numPrevDocs = 0, currDoc, count;
      OutputBitStream obs;
      Index i;
      IndexIterator ii;


      if ( p != 0 ) variableQuantumIndexWriter.newInvertedList(totalFrequency, p, predictedSize, predictedLengthNumBits ); 
      else indexWriter.newInvertedList();

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      indexWriter.writeFrequency( totalFrequency );


      int currDoc = -1, count; 
      OutputBitStream obs;
      Index i;
      IndexIterator ir;


      while( ! documentQueue.isEmpty() ) {
        // We extract the smallest document pointer, and enqueue it in the new index.
        if ( currDoc == doc[ currIndex = documentQueue.first() ] ) throw new IllegalStateException( "The indices to be merged contain document " + currDoc + " at least twice (once in index " + inputBasename[ lastIndex ] + " and once in index " + inputBasename[ currIndex ] + ")" );

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     * maxCount need not be updated, as it is already initialised to
     * the maximum over all indices. */
    int currIndex, prevDoc = -1, currDoc, count;
    int temp[];
    OutputBitStream obs;
    Index i;
    IndexIterator ii;
  
    // Note that the total frequency can be computed only during the merge.
    for( int k = numUsedIndices; k-- != 0; ) {
      currIndex = usedIndex[ k ];

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  }
  
  public Boolean visit( final IndexIterator indexIterator ) throws IOException {
    // TODO: the second condition should be checked elsewhere, maybe...
    if ( indexIterator.frequency() > 0 && indexIterator.index().hasCounts) { // We skip empty iterators and indices without counts 
      final Index index = indexIterator.index();
      final String term = indexIterator.term();
      
      if ( term == null ) throw new NullPointerException( "This visitor needs a non-null term for each index iterator of nonzero frequency" );
      
      if ( ! term2Id.containsKey( term ) ) term2Id.put( term, term2Id.size() );

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    final DataOutputStream outputStream = new DataOutputStream( socket.getOutputStream() );
    outputStream.writeByte( GET_INDEX );
    outputStream.writeBoolean( randomAccess );
    outputStream.writeBoolean( documentSizes );
    outputStream.flush();
    Index index = (Index)BinIO.loadObject( socket.getInputStream() );
    socket.close();
    LOGGER.debug( "Index at " + socket + " downloaded: " + index );
    return index;
  }

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