Examples of it.unimi.dsi.mg4j.index.Index.documents()

it.unimi.dsi.mg4j.index.Index.documents()
Creates a new {@link IndexReader} for this index and uses it to return an index iterator over the documents containing a term.
Since the reader is created from scratch, it is essential to {@linkplain it.unimi.dsi.mg4j.search.DocumentIterator#dispose() dispose} thereturned iterator after usage. See {@link IndexReader#documents(int)}for a method with the same semantics, but making reader reuse possible. @param term a term. @throws IOException if an exception occurred while accessing the index. @throws UnsupportedOperationException if this index is not accessible by termnumber. @see IndexReader#documents(int)

    
    
    Index index = Index.getInstance( basename );
    assertEquals( 2, index.documents( 0 ).frequency() );      
    assertEquals( 2, index.documents( 1 ).frequency() );
    assertEquals( 1, index.documents( 2 ).frequency() );
    assertEquals( 1, index.documents( 3 ).frequency() );
    
    SemiExternalGammaList frequencies = new SemiExternalGammaList( new InputBitStream( basename + "-mo" + DiskBasedIndex.FREQUENCIES_EXTENSION ), 1, 4 );


    assertEquals( 2, frequencies.getLong( 0 ) );

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    Index index = Index.getInstance( basename );
    assertEquals( 2, index.documents( 0 ).frequency() );      
    assertEquals( 2, index.documents( 1 ).frequency() );
    assertEquals( 1, index.documents( 2 ).frequency() );
    assertEquals( 1, index.documents( 3 ).frequency() );
    
    SemiExternalGammaList frequencies = new SemiExternalGammaList( new InputBitStream( basename + "-mo" + DiskBasedIndex.FREQUENCIES_EXTENSION ), 1, 4 );


    assertEquals( 2, frequencies.getLong( 0 ) );      
    assertEquals( 2, frequencies.getLong( 1 ) );

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  public void testSkipToEndOfList() throws ConfigurationException, SecurityException, IOException, URISyntaxException, ClassNotFoundException, InstantiationException, IllegalAccessException, InvocationTargetException, NoSuchMethodException {
    String basename = File.createTempFile( getClass().getSimpleName(), "test" ).getCanonicalPath();
    new IndexBuilder( basename, new StringArrayDocumentCollection( new String[] { "a", "a", "c" } ) ).run();


    Index index = DiskBasedIndex.getInstance( basename + "-text", true, true );
    IndexIterator indexIterator = index.documents( "a" );
    assertEquals( Integer.MAX_VALUE, indexIterator.skipTo( Integer.MAX_VALUE ) );
    indexIterator.dispose();


    indexIterator = index.documents( "a" );
    assertEquals( 0, indexIterator.skipTo( 0 ) );

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    Index index = DiskBasedIndex.getInstance( basename + "-text", true, true );
    IndexIterator indexIterator = index.documents( "a" );
    assertEquals( Integer.MAX_VALUE, indexIterator.skipTo( Integer.MAX_VALUE ) );
    indexIterator.dispose();


    indexIterator = index.documents( "a" );
    assertEquals( 0, indexIterator.skipTo( 0 ) );
    assertEquals( 1, indexIterator.skipTo( 1 ) );
    assertEquals( Integer.MAX_VALUE, indexIterator.skipTo( 2 ) );
    indexIterator.dispose();
}

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    flc = new FileLinesCollection( basename + "-cluster-0.terms", "ASCII" );
    BinIO.storeObject( new ShiftAddXorSignedStringMap( flc.iterator(), new MWHCFunction<CharSequence>( flc , TransformationStrategies.utf16() ) ), basename + "-cluster-0.termmap" );  
    flc = new FileLinesCollection( basename + "-cluster-1.terms", "ASCII" );
    BinIO.storeObject( new ShiftAddXorSignedStringMap( flc.iterator(), new MWHCFunction<CharSequence>( flc , TransformationStrategies.utf16() ) ), basename + "-cluster-1.termmap" );  
    Index index = Index.getInstance( basename + "-cluster" );
    assertEquals( Integer.MAX_VALUE, index.documents( "b" ).skipTo( 2 ) );
  }
  
}

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