framework.retrieval.engine.query.item.QueryUtil.java Source code

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Here is the source code for framework.retrieval.engine.query.item.QueryUtil.java

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/**
 * Copyright 2010 
 *
 * Licensed 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.
 */
package framework.retrieval.engine.query.item;

import org.apache.lucene.analysis.Analyzer;
import org.apache.lucene.search.Query;
import org.apache.lucene.search.Sort;
import org.apache.lucene.search.SortField;

import framework.retrieval.engine.analyzer.IRAnalyzerFactory;

/**
 * QueryUtil
 * @author 
 *
 */
public class QueryUtil {

    private QueryUtil() {

    }

    /**
     * ??
     * 
     * @param orderByFlag
     * @return
     */
    public static Sort createCreateTimeSort(boolean orderByFlag) {
        Sort sort = new Sort(new SortField[] { new SortField(null, SortField.DOC, orderByFlag) });
        return sort;
    }

    /**
     * ??
     * 
     * @return
     */
    public static Sort createScoreSort() {
        Sort sort = new Sort(new SortField[] { SortField.FIELD_SCORE, new SortField(null, SortField.DOC, true) });
        return sort;
    }

    /**
     * ??
     * 
     * @return
     */
    public static Analyzer createQueryAnalyzer(IRAnalyzerFactory analyzerFactory) {
        return analyzerFactory.createQueryAnalyzer();
    }

    /**
     * Query
     * 
     * @param fieldName
     * @param value
     * @return
     */
    public static Query createQuery(IRAnalyzerFactory analyzerFactory, String fieldName, String value) {
        return analyzerFactory.createQuery(fieldName, value);
    }

    public static Query createQuery(IRAnalyzerFactory analyzerFactory, String fieldName, String value,
            Float score) {
        return analyzerFactory.createQuery(fieldName, value, score);
    }
}