/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
using System;
using DocIdSet = Lucene.Net.Search.DocIdSet;
using DocIdSetIterator = Lucene.Net.Search.DocIdSetIterator;
namespace Lucene.Net.Util
{
/// Simple DocIdSet and DocIdSetIterator backed by a BitSet
public class DocIdBitSet:DocIdSet
{
private System.Collections.BitArray bitSet;
public DocIdBitSet(System.Collections.BitArray bitSet)
{
this.bitSet = bitSet;
}
public override DocIdSetIterator Iterator()
{
return new DocIdBitSetIterator(bitSet);
}
/// This DocIdSet implementation is cacheable.
public override bool IsCacheable()
{
return true;
}
/// Returns the underlying BitSet.
public virtual System.Collections.BitArray GetBitSet()
{
return this.bitSet;
}
private class DocIdBitSetIterator:DocIdSetIterator
{
private int docId;
private System.Collections.BitArray bitSet;
internal DocIdBitSetIterator(System.Collections.BitArray bitSet)
{
this.bitSet = bitSet;
this.docId = - 1;
}
/// use {@link #DocID()} instead.
///
[Obsolete("use DocID() instead.")]
public override int Doc()
{
System.Diagnostics.Debug.Assert(docId != - 1);
return docId;
}
public override int DocID()
{
return docId;
}
/// use {@link #NextDoc()} instead.
///
[Obsolete("use NextDoc() instead.")]
public override bool Next()
{
// (docId + 1) on next line requires -1 initial value for docNr:
return NextDoc() != NO_MORE_DOCS;
}
public override int NextDoc()
{
// (docId + 1) on next line requires -1 initial value for docNr:
int d = SupportClass.BitSetSupport.NextSetBit(bitSet, docId + 1);
// -1 returned by BitSet.nextSetBit() when exhausted
docId = d == - 1?NO_MORE_DOCS:d;
return docId;
}
/// use {@link #Advance(int)} instead.
///
[Obsolete("use Advance(int) instead.")]
public override bool SkipTo(int skipDocNr)
{
return Advance(skipDocNr) != NO_MORE_DOCS;
}
public override int Advance(int target)
{
int d = SupportClass.BitSetSupport.NextSetBit(bitSet, target);
// -1 returned by BitSet.nextSetBit() when exhausted
docId = d == - 1?NO_MORE_DOCS:d;
return docId;
}
}
}
}