content: package org.apache.solr.handler;
  /**
   * 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.solr.common.SolrException;
  import org.apache.solr.common.params.SolrParams;
  import org.apache.solr.common.util.ContentStream;
  import org.apache.solr.request.SolrQueryRequest;
  import org.apache.solr.response.SolrQueryResponse;
  import org.apache.solr.update.processor.UpdateRequestProcessor;
  import org.apache.solr.update.processor.UpdateRequestProcessorChain;
  import org.apache.solr.util.SolrPluginUtils;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  
  /**
   * Shares common code between various handlers that manipulate {@link org.apache.solr.common.util.ContentStream} objects.
   *
   **/
  public abstract class ContentStreamHandlerBase extends RequestHandlerBase {
    public static Logger log = LoggerFactory.getLogger(XmlUpdateRequestHandler.class);
  
    @Override
    public void handleRequestBody(SolrQueryRequest req, SolrQueryResponse rsp) throws Exception {
      SolrParams params = req.getParams();
      UpdateRequestProcessorChain processorChain =
              req.getCore().getUpdateProcessingChain(SolrPluginUtils.resolveUpdateChainParam(params, log));
  
      UpdateRequestProcessor processor = processorChain.createProcessor(req, rsp);
  
      try {
        ContentStreamLoader documentLoader = newLoader(req, processor);
  
  
        Iterable<ContentStream> streams = req.getContentStreams();
        if (streams == null) {
          if (!RequestHandlerUtils.handleCommit(processor, params, false) && !RequestHandlerUtils.handleRollback(processor, params, false)) {
            throw new SolrException(SolrException.ErrorCode.BAD_REQUEST, "missing content stream");
          }
        } else {
  
          for (ContentStream stream : streams) {
            documentLoader.load(req, rsp, stream);
          }
  
          // Perhaps commit from the parameters
          RequestHandlerUtils.handleCommit(processor, params, false);
          RequestHandlerUtils.handleRollback(processor, params, false);
        }
      } finally {
        // finish the request
        processor.finish();
      }
    }
  
    protected abstract ContentStreamLoader newLoader(SolrQueryRequest req, UpdateRequestProcessor processor);
  }
  