com.browseengine.bobo.search.section.AndNotNode.java Source code

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Here is the source code for com.browseengine.bobo.search.section.AndNotNode.java

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/**
 * 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-NOT operator node for SectionSearchQueryPlan
 */
public class AndNotNode extends SectionSearchQueryPlan {
    SectionSearchQueryPlan _positiveNode;
    SectionSearchQueryPlan _negativeNode;

    public AndNotNode(SectionSearchQueryPlan positiveNode, SectionSearchQueryPlan negativeNode) {
        super();
        _positiveNode = positiveNode;
        _negativeNode = negativeNode;
    }

    @Override
    public int fetchDoc(int targetDoc) throws IOException {
        _curDoc = _positiveNode.fetchDoc(targetDoc);
        _curSec = -1;
        return _curDoc;
    }

    @Override
    public int fetchSec(int targetSec) throws IOException {
        while (_curSec < SectionSearchQueryPlan.NO_MORE_SECTIONS) {
            _curSec = _positiveNode.fetchSec(targetSec);
            if (_curSec == SectionSearchQueryPlan.NO_MORE_SECTIONS)
                break;

            targetSec = _curSec;

            if (_negativeNode._curDoc < _curDoc) {
                if (_negativeNode.fetchDoc(_curDoc) == DocIdSetIterator.NO_MORE_DOCS)
                    break;
            }

            if (_negativeNode._curDoc == _curDoc
                    && (_negativeNode._curSec == SectionSearchQueryPlan.NO_MORE_SECTIONS
                            || _negativeNode.fetchSec(targetSec) > _curSec)) {
                break;
            }
        }
        return _curSec;
    }
}