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;abstract class DocConsumerPerThread {  /** Process the document. If there is   *  something for this document to be done in docID order,   *  you should encapsulate that as a   *  DocumentsWriter.DocWriter and return it.   *  DocumentsWriter then calls finish() on this object   *  when it's its turn. */  abstract DocumentsWriter.DocWriter processDocument() throws IOException;  abstract void abort();}