org.apache.gora.solr.query.SolrResult.java Source code

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Here is the source code for org.apache.gora.solr.query.SolrResult.java

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/**
 * 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.gora.solr.query;

import java.io.IOException;
import java.util.Arrays;
import java.util.HashSet;

import org.apache.gora.persistency.impl.PersistentBase;
import org.apache.gora.query.Query;
import org.apache.gora.query.impl.PartitionQueryImpl;
import org.apache.gora.query.impl.ResultBase;
import org.apache.gora.solr.store.SolrStore;
import org.apache.gora.store.DataStore;
import org.apache.solr.client.solrj.SolrServer;
import org.apache.solr.client.solrj.SolrServerException;
import org.apache.solr.client.solrj.response.QueryResponse;
import org.apache.solr.common.SolrDocument;
import org.apache.solr.common.SolrDocumentList;
import org.apache.solr.common.params.CommonParams;
import org.apache.solr.common.params.ModifiableSolrParams;

public class SolrResult<K, T extends PersistentBase> extends ResultBase<K, T> {
    SolrDocumentList list = null;
    SolrStore<K, T> store;
    String[] fields;
    int pos = 0;

    public SolrResult(DataStore<K, T> dataStore, Query<K, T> query, SolrServer server, int resultsSize)
            throws IOException {
        super(dataStore, query);
        store = (SolrStore<K, T>) dataStore;
        ModifiableSolrParams params = new ModifiableSolrParams();
        if (query instanceof PartitionQueryImpl) {
            query = ((PartitionQueryImpl<K, T>) query).getBaseQuery();
        }
        String q = ((SolrQuery<K, T>) query).toSolrQuery();
        params.set(CommonParams.Q, q);
        fields = query.getFields();
        if (fields == null) {
            params.set(CommonParams.FL, "*");
        } else {
            HashSet<String> uniqFields = new HashSet<String>(Arrays.asList(fields));
            String keyFld = ((SolrStore<K, T>) dataStore).getMapping().getPrimaryKey();
            uniqFields.add(keyFld); // return also primary key
            StringBuilder sb = new StringBuilder();
            for (String f : uniqFields) {
                if (sb.length() > 0)
                    sb.append(',');
                sb.append(f);
            }
            params.set(CommonParams.FL, sb.toString());
        }
        params.set(CommonParams.ROWS, resultsSize);
        try {
            QueryResponse rsp = server.query(params);
            list = rsp.getResults();
        } catch (SolrServerException e) {
            e.printStackTrace();
            throw new IOException(e);
        }
    }

    @SuppressWarnings("unchecked")
    @Override
    protected boolean nextInner() throws IOException {
        if (list == null || pos >= list.size()) {
            return false;
        }
        SolrDocument doc = list.get(pos++);
        key = (K) doc.get(store.getMapping().getPrimaryKey());
        persistent = store.newInstance(doc, fields);
        return true;
    }

    @Override
    public void close() throws IOException {
        if (list != null)
            list.clear();
    }

    @Override
    public float getProgress() throws IOException {
        if (list != null && list.size() > 0) {
            return (float) pos / (float) list.size();
        } else {
            return 0;
        }
    }
}