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

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Here is the source code for com.browseengine.bobo.search.section.AndNode.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 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;
    }
}