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IndexReaderStub.java
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IndexReaderStub.java
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/*
* Copyright (c) 2002-2016 "Neo Technology,"
* Network Engine for Objects in Lund AB [http://neotechnology.com]
*
* This file is part of Neo4j.
*
* Neo4j is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
package org.neo4j.kernel.api.impl.index;
import org.apache.commons.lang3.math.NumberUtils;
import org.apache.lucene.index.BinaryDocValues;
import org.apache.lucene.index.DocValues;
import org.apache.lucene.index.DocValuesType;
import org.apache.lucene.index.FieldInfo;
import org.apache.lucene.index.FieldInfos;
import org.apache.lucene.index.Fields;
import org.apache.lucene.index.IndexOptions;
import org.apache.lucene.index.LeafReader;
import org.apache.lucene.index.NumericDocValues;
import org.apache.lucene.index.SortedDocValues;
import org.apache.lucene.index.SortedNumericDocValues;
import org.apache.lucene.index.SortedSetDocValues;
import org.apache.lucene.index.StoredFieldVisitor;
import org.apache.lucene.util.Bits;
import java.io.IOException;
import java.nio.charset.StandardCharsets;
import java.util.Arrays;
import java.util.Collections;
import java.util.Map;
import java.util.function.Function;
import static com.sun.corba.se.spi.activation.IIOP_CLEAR_TEXT.value;
public class IndexReaderStub extends LeafReader
{
private Fields fields;
private boolean allDeleted;
private String[] elements = new String[0];
private Function<String,NumericDocValues> ndvs = s -> DocValues.emptyNumeric();
private IOException throwOnFields;
private static FieldInfo DummyFieldInfo =
new FieldInfo( "id", 0, false, true, false, IndexOptions.DOCS,
DocValuesType.NONE, -1, Collections.<String,String>emptyMap() );
public IndexReaderStub( boolean allDeleted, final String... elements )
{
this.allDeleted = allDeleted;
this.elements = elements;
}
public IndexReaderStub( Fields fields )
{
this.fields = fields;
}
public IndexReaderStub( final NumericDocValues ndv )
{
this.ndvs = s -> ndv;
}
public IndexReaderStub( final Map<String,NumericDocValues> ndvs )
{
this.ndvs = s -> {
NumericDocValues dv = ndvs.get( s );
if ( dv == null )
{
return DocValues.emptyNumeric();
}
return dv;
};
}
public void setElements( String[] elements )
{
this.elements = elements;
}
@Override
public void addCoreClosedListener( CoreClosedListener listener )
{
}
@Override
public void removeCoreClosedListener( CoreClosedListener listener )
{
}
@Override
public Fields fields() throws IOException
{
if ( throwOnFields != null )
{
IOException exception = this.throwOnFields;
throwOnFields = null;
throw exception;
}
return fields;
}
@Override
public NumericDocValues getNumericDocValues( String field ) throws IOException
{
return ndvs.apply( field );
}
@Override
public BinaryDocValues getBinaryDocValues( String field ) throws IOException
{
return DocValues.emptyBinary();
}
@Override
public SortedDocValues getSortedDocValues( String field ) throws IOException
{
return DocValues.emptySorted();
}
@Override
public SortedNumericDocValues getSortedNumericDocValues( String field ) throws IOException
{
return DocValues.emptySortedNumeric( elements.length );
}
@Override
public SortedSetDocValues getSortedSetDocValues( String field ) throws IOException
{
return DocValues.emptySortedSet();
}
@Override
public Bits getDocsWithField( String field ) throws IOException
{
throw new RuntimeException( "Not yet implemented." );
}
@Override
public NumericDocValues getNormValues( String field ) throws IOException
{
return DocValues.emptyNumeric();
}
@Override
public FieldInfos getFieldInfos()
{
throw new RuntimeException( "Not yet implemented." );
}
@Override
public Bits getLiveDocs()
{
return new Bits()
{
@Override
public boolean get( int index )
{
if ( index >= elements.length )
{
throw new IllegalArgumentException( "Doc id out of range" );
}
return !allDeleted;
}
@Override
public int length()
{
return elements.length;
}
};
}
@Override
public void checkIntegrity() throws IOException
{
}
@Override
public Fields getTermVectors( int docID ) throws IOException
{
throw new RuntimeException( "Not yet implemented." );
}
@Override
public int numDocs()
{
return allDeleted ? 0 : elements.length;
}
@Override
public int maxDoc()
{
return Math.max( maxValue(), elements.length) + 1;
}
@Override
public void document( int docID, StoredFieldVisitor visitor ) throws IOException
{
visitor.stringField( DummyFieldInfo, String.valueOf( docID ).getBytes( StandardCharsets.UTF_8 ) );
}
@Override
protected void doClose() throws IOException
{
}
private int maxValue()
{
return Arrays.stream( elements )
.mapToInt( value -> NumberUtils.toInt( value, 0 )).max().getAsInt();
}
}