content: package org.apache.lucene.index;
  
  /**
   * 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 java.io.IOException;
  import java.util.Collection;
  import java.util.Map;
  import java.util.HashMap;
  
  
  /**
   * This is a DocConsumer that gathers all fields under the
   * same name, and calls per-field consumers to process field
   * by field.  This class doesn't doesn't do any "real" work
   * of its own: it just forwards the fields to a
   * DocFieldConsumer.
   */
  
  final class DocFieldProcessor extends DocConsumer {
  
    final DocumentsWriter docWriter;
    final FieldInfos fieldInfos;
    final DocFieldConsumer consumer;
    final StoredFieldsWriter fieldsWriter;
  
    public DocFieldProcessor(DocumentsWriter docWriter, DocFieldConsumer consumer) {
      this.docWriter = docWriter;
      this.consumer = consumer;
      fieldInfos = docWriter.getFieldInfos();
      consumer.setFieldInfos(fieldInfos);
      fieldsWriter = new StoredFieldsWriter(docWriter, fieldInfos);
    }
  
    @Override
    public void flush(Collection<DocConsumerPerThread> threads, SegmentWriteState state) throws IOException {
  
      Map<DocFieldConsumerPerThread, Collection<DocFieldConsumerPerField>> childThreadsAndFields = new HashMap<DocFieldConsumerPerThread, Collection<DocFieldConsumerPerField>>();
      for ( DocConsumerPerThread thread : threads) {
        DocFieldProcessorPerThread perThread = (DocFieldProcessorPerThread) thread;
        childThreadsAndFields.put(perThread.consumer, perThread.fields());
        perThread.trimFields(state);
      }
  
      fieldsWriter.flush(state);
      consumer.flush(childThreadsAndFields, state);
  
      // Important to save after asking consumer to flush so
      // consumer can alter the FieldInfo* if necessary.  EG,
      // FreqProxTermsWriter does this with
      // FieldInfo.storePayload.
      final String fileName = IndexFileNames.segmentFileName(state.segmentName, IndexFileNames.FIELD_INFOS_EXTENSION);
      fieldInfos.write(state.directory, fileName);
    }
  
    @Override
    public void abort() {
      try {
        fieldsWriter.abort();
      } finally {
        consumer.abort();
      }
    }
  
    @Override
    public boolean freeRAM() {
      return consumer.freeRAM();
    }
  
    @Override
    public DocConsumerPerThread addThread(DocumentsWriterThreadState threadState) throws IOException {
      return new DocFieldProcessorPerThread(threadState, this);
    }
  }
  