/**
 * 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.nutch.indexer;

import java.net.URL;
import java.util.ArrayList;
import java.util.Enumeration;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.conf.Configured;
import org.apache.lucene.document.Document;
import org.apache.lucene.document.Field;
import org.apache.solr.client.solrj.SolrServer;
import org.apache.solr.client.solrj.impl.CommonsHttpSolrServer;
import org.apache.solr.common.SolrInputDocument;

/** Adapter class that hides the API of Solr java client from Nutch. */
public class SolrClientAdapter extends Configured {

  private static Log LOG = LogFactory.getLog(SolrClientAdapter.class);

  private static final String INDEXER_SOLR_URL = "indexer.solr.url";
  
  private static ArrayList<String> ignoreFields = new ArrayList();
  static {
    ignoreFields.add("boost");
  }

  SolrServer solr;

  public SolrClientAdapter(Configuration conf) {
    super(conf);

    String url = conf.get(INDEXER_SOLR_URL);
    if (url == null) {
      throw new RuntimeException("Solr server url (" + INDEXER_SOLR_URL
          + ") is not defined");
    }
    try {
      solr = new CommonsHttpSolrServer(new URL(url));
    } catch (Exception e) {
      throw new RuntimeException("Cannot instantiate Solr client with url: '"
          + url + "'. Reason: " + e.getMessage());
    }

  }

  /** Adds single Lucene document to index. */
  public void index(Document doc) {

    SolrInputDocument solrDoc = new SolrInputDocument();
    for (Enumeration<Field> e = doc.fields(); e.hasMoreElements();) {
      Field field = e.nextElement();
      if (!ignoreFields.contains((field.name()))) {
        solrDoc.addField( field.name(), field.stringValue(), field.getBoost() );
      }
    }
    try {
      solr.add(solrDoc);
    } catch (Exception e) {
      LOG.warn("Could not index document, reason:" + e.getMessage(), e);
    }
  }
  
  /** Commits changes */
  public void commit(){
    try {
      solr.commit(true, false);
    } catch (Exception e) {
      LOG.warn("Could not commit, reason:" + e.getMessage(), e);
    }
  }
}