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.Map;abstract class DocFieldConsumer {  FieldInfos fieldInfos;  /** Called when DocumentsWriter decides to create a new   *  segment */  abstract void flush(Map threadsAndFields, DocumentsWriter.FlushState state) throws IOException;  /** Called when DocumentsWriter decides to close the doc   *  stores */  abstract void closeDocStore(DocumentsWriter.FlushState state) throws IOException;    /** Called when an aborting exception is hit */  abstract void abort();  /** Add a new thread */  abstract DocFieldConsumerPerThread addThread(DocFieldProcessorPerThread docFieldProcessorPerThread) throws IOException;  /** Called when DocumentsWriter is using too much RAM.   *  The consumer should free RAM, if possible, returning   *  true if any RAM was in fact freed. */  abstract boolean freeRAM();  void setFieldInfos(FieldInfos fieldInfos) {    this.fieldInfos = fieldInfos;  }}