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

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Here is the source code for com.browseengine.bobo.search.section.AbstractTerminalNode.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.index.IndexReader;
import org.apache.lucene.index.Term;
import org.apache.lucene.index.TermPositions;
import org.apache.lucene.search.DocIdSetIterator;

/**
 * An abstract class for terminal nodes of SectionSearchQueryPlan
 */
public abstract class AbstractTerminalNode extends SectionSearchQueryPlan {
    protected TermPositions _tp;
    protected int _posLeft;
    protected int _curPos;

    public AbstractTerminalNode(Term term, IndexReader reader) throws IOException {
        super();
        _tp = reader.termPositions();
        _tp.seek(term);
        _posLeft = 0;
    }

    @Override
    public int fetchDoc(int targetDoc) throws IOException {
        if (targetDoc <= _curDoc)
            targetDoc = _curDoc + 1;

        if (_tp.skipTo(targetDoc)) {
            _curDoc = _tp.doc();
            _posLeft = _tp.freq();
            _curSec = -1;
            _curPos = -1;
            return _curDoc;
        } else {
            _curDoc = DocIdSetIterator.NO_MORE_DOCS;
            _tp.close();
            return _curDoc;
        }
    }

    abstract public int fetchSec(int targetSec) throws IOException;
}