org.apache.solr.search.mlt.CloudMLTQParser.java Source code

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Here is the source code for org.apache.solr.search.mlt.CloudMLTQParser.java

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package org.apache.solr.search.mlt;
/*
 * 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.
 */

import org.apache.lucene.queries.mlt.MoreLikeThis;
import org.apache.lucene.search.Query;
import org.apache.solr.common.SolrDocument;
import org.apache.solr.common.SolrException;
import org.apache.solr.common.params.ModifiableSolrParams;
import org.apache.solr.common.params.SolrParams;
import org.apache.solr.common.util.NamedList;
import org.apache.solr.core.SolrCore;
import org.apache.solr.request.SolrQueryRequest;
import org.apache.solr.request.SolrQueryRequestBase;
import org.apache.solr.response.SolrQueryResponse;
import org.apache.solr.schema.SchemaField;
import org.apache.solr.search.QParser;
import org.apache.solr.search.QueryParsing;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.io.IOException;
import java.util.ArrayList;
import java.util.Collection;
import java.util.HashMap;
import java.util.Map;

public class CloudMLTQParser extends QParser {

    public CloudMLTQParser(String qstr, SolrParams localParams, SolrParams params, SolrQueryRequest req) {
        super(qstr, localParams, params, req);
    }

    private static Logger log = LoggerFactory.getLogger(CloudMLTQParser.class);

    public Query parse() {
        String id = localParams.get(QueryParsing.V);
        // Do a Real Time Get for the document
        SolrDocument doc = getDocument(id);

        MoreLikeThis mlt = new MoreLikeThis(req.getSearcher().getIndexReader());
        // TODO: Are the mintf and mindf defaults ok at 1/0 ?

        mlt.setMinTermFreq(localParams.getInt("mintf", 1));
        mlt.setMinDocFreq(localParams.getInt("mindf", 0));
        if (localParams.get("minwl") != null)
            mlt.setMinWordLen(localParams.getInt("minwl"));

        if (localParams.get("maxwl") != null)
            mlt.setMaxWordLen(localParams.getInt("maxwl"));

        mlt.setAnalyzer(req.getSchema().getIndexAnalyzer());

        String[] qf = localParams.getParams("qf");
        Map<String, Collection<Object>> filteredDocument = new HashMap();

        if (qf != null) {
            mlt.setFieldNames(qf);
            for (String field : qf) {
                filteredDocument.put(field, doc.getFieldValues(field));
            }
        } else {
            Map<String, SchemaField> fields = req.getSchema().getFields();
            ArrayList<String> fieldNames = new ArrayList();
            for (String field : doc.getFieldNames()) {
                // Only use fields that are stored and have an explicit analyzer.
                // This makes sense as the query uses tf/idf/.. for query construction.
                // We might want to relook and change this in the future though.
                if (fields.get(field).stored() && fields.get(field).getType().isExplicitAnalyzer()) {
                    fieldNames.add(field);
                    filteredDocument.put(field, doc.getFieldValues(field));
                }
            }
            mlt.setFieldNames(fieldNames.toArray(new String[fieldNames.size()]));
        }

        try {
            return mlt.like(filteredDocument);
        } catch (IOException e) {
            e.printStackTrace();
            throw new SolrException(SolrException.ErrorCode.BAD_REQUEST, "Bad Request");
        }

    }

    private SolrDocument getDocument(String id) {
        SolrCore core = req.getCore();
        SolrQueryResponse rsp = new SolrQueryResponse();
        ModifiableSolrParams params = new ModifiableSolrParams();
        params.add("id", id);

        SolrQueryRequestBase request = new SolrQueryRequestBase(core, params) {
        };

        core.getRequestHandler("/get").handleRequest(request, rsp);
        NamedList response = rsp.getValues();

        return (SolrDocument) response.get("doc");
    }

}