com.browseengine.bobo.search.section.AndNode Maven / Gradle / Ivy
/**
* This software is licensed to you under the Apache License, Version 2.0 (the
* "Apache License").
*
* LinkedIn's contributions are made under the Apache License. If you contribute
* to the Software, the contributions will be deemed to have been made under the
* Apache License, unless you expressly indicate otherwise. Please do not make any
* contributions that would be inconsistent with the Apache License.
*
* You may obtain a copy of the Apache License at http://www.apache.org/licenses/LICENSE-2.0
* Unless required by applicable law or agreed to in writing, this software
* distributed under the Apache License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the Apache
* License for the specific language governing permissions and limitations for the
* software governed under the Apache License.
*
* © 2012 LinkedIn Corp. All Rights Reserved.
*/
package com.browseengine.bobo.search.section;
import java.io.IOException;
import org.apache.lucene.search.DocIdSetIterator;
/**
* AND operator node for SectionSearchQueryPlan
*/
public class AndNode extends SectionSearchQueryPlan
{
protected SectionSearchQueryPlan[] _subqueries;
public AndNode(SectionSearchQueryPlan[] subqueries)
{
_subqueries = subqueries;
_curDoc = (subqueries.length > 0 ? -1 : DocIdSetIterator.NO_MORE_DOCS);
}
@Override
public int fetchDoc(int targetDoc) throws IOException
{
if(_curDoc == DocIdSetIterator.NO_MORE_DOCS)
{
return _curDoc;
}
SectionSearchQueryPlan node = _subqueries[0];
_curDoc = node.fetchDoc(targetDoc);
targetDoc = _curDoc;
int i = 1;
while(i < _subqueries.length)
{
node = _subqueries[i];
if(node._curDoc < targetDoc)
{
_curDoc = node.fetchDoc(targetDoc);
if(_curDoc == DocIdSetIterator.NO_MORE_DOCS)
{
return _curDoc;
}
if(_curDoc > targetDoc)
{
targetDoc = _curDoc;
i = 0;
continue;
}
}
i++;
}
_curSec = -1;
return _curDoc;
}
@Override
public int fetchSec(int targetSec) throws IOException
{
SectionSearchQueryPlan node = _subqueries[0];
targetSec = node.fetchSec(targetSec);
if (targetSec == SectionSearchQueryPlan.NO_MORE_SECTIONS)
{
_curSec = SectionSearchQueryPlan.NO_MORE_SECTIONS;
return targetSec;
}
int i = 1;
while(i < _subqueries.length)
{
node = _subqueries[i];
if(node._curSec < targetSec)
{
_curSec = node.fetchSec(targetSec);
if (_curSec == SectionSearchQueryPlan.NO_MORE_SECTIONS)
{
return _curSec;
}
if(_curSec > targetSec)
{
targetSec = _curSec;
i = 0;
continue;
}
}
i++;
}
return _curSec;
}
}