org.apache.oodt.cas.filemgr.browser.model.QueryBuilder.java Source code

Introduction

Here is the source code for org.apache.oodt.cas.filemgr.browser.model.QueryBuilder.java

Source

/**
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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 org.apache.oodt.cas.filemgr.browser.model;

import org.apache.lucene.index.Term;
import org.apache.lucene.queryparser.classic.QueryParser;
import org.apache.lucene.search.*;
import org.apache.lucene.util.BytesRef;
import org.apache.oodt.cas.filemgr.structs.Query;
import org.apache.oodt.cas.filemgr.structs.RangeQueryCriteria;
import org.apache.oodt.cas.filemgr.structs.TermQueryCriteria;
import org.apache.oodt.cas.filemgr.tools.CASAnalyzer;

import java.util.List;
import java.util.logging.Level;
import java.util.logging.Logger;

public class QueryBuilder {

    private CasDB database;
    private static Logger LOG = Logger.getLogger(QueryBuilder.class.getName());

    public QueryBuilder(CasDB db) {
        database = db;
    }

    public Query ParseQuery(String query) {
        // note that "__FREE__" is a control work for free text searching
        QueryParser parser = new QueryParser("__FREE__", new CASAnalyzer());

        org.apache.lucene.search.Query luceneQ = null;
        org.apache.oodt.cas.filemgr.structs.Query casQ = new org.apache.oodt.cas.filemgr.structs.Query();

        try {
            luceneQ = parser.parse(query);
        } catch (org.apache.lucene.queryparser.classic.ParseException e) {
            // TODO Auto-generated catch block
            LOG.log(Level.SEVERE, e.getMessage());
        }

        System.out.println(luceneQ != null ? luceneQ.toString() : null);
        GenerateCASQuery(casQ, luceneQ);

        return casQ;
    }

    public void GenerateCASQuery(org.apache.oodt.cas.filemgr.structs.Query casQ,
            org.apache.lucene.search.Query luceneQ) {
        if (luceneQ instanceof TermQuery) {
            Term t = ((TermQuery) luceneQ).getTerm();
            if (!t.field().equals("__FREE__")) {
                String element = database.getElementID(t.field());
                if (!element.equals("") && !t.text().equals("")) {

                    casQ.addCriterion(new TermQueryCriteria(element, t.text()));
                }
            }
        } else if (luceneQ instanceof PhraseQuery) {
            Term[] t = ((PhraseQuery) luceneQ).getTerms();
            if (!t[0].field().equals("__FREE__")) {
                for (Term aT : t) {
                    String element = database.getElementID(aT.field());
                    if (!element.equals("") && !aT.text().equals("")) {
                        casQ.addCriterion(new TermQueryCriteria(element, aT.text()));
                    }
                }
            }
        } else if (luceneQ instanceof TermRangeQuery) {
            BytesRef startT = ((TermRangeQuery) luceneQ).getLowerTerm();
            BytesRef endT = ((TermRangeQuery) luceneQ).getUpperTerm();
            String element = database.getElementID(((TermRangeQuery) luceneQ).getField());
            if (!element.equals("") && !startT.utf8ToString().equals("") && !endT.utf8ToString().equals("")) {
                casQ.addCriterion(new RangeQueryCriteria(element, startT.utf8ToString(), endT.utf8ToString()));
            }
        } else if (luceneQ instanceof BooleanQuery) {
            List<BooleanClause> clauses = ((BooleanQuery) luceneQ).clauses();
            for (BooleanClause clause : clauses) {
                GenerateCASQuery(casQ, (clause).getQuery());
            }
        } else {
            System.out.println("Error Parsing Query");
            System.exit(-1);
        }
    }

}