| /* |
| * 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.lucene.codecs; |
| |
| |
| import java.io.IOException; |
| |
| import org.apache.lucene.index.PointValues; |
| import org.apache.lucene.index.SegmentReadState; |
| import org.apache.lucene.index.SegmentWriteState; |
| |
| /** |
| * Encodes/decodes indexed points. |
| * |
| * @lucene.experimental */ |
| public abstract class PointsFormat { |
| |
| /** |
| * Creates a new point format. |
| */ |
| protected PointsFormat() { |
| } |
| |
| /** Writes a new segment */ |
| public abstract PointsWriter fieldsWriter(SegmentWriteState state) throws IOException; |
| |
| /** Reads a segment. NOTE: by the time this call |
| * returns, it must hold open any files it will need to |
| * use; else, those files may be deleted. |
| * Additionally, required files may be deleted during the execution of |
| * this call before there is a chance to open them. Under these |
| * circumstances an IOException should be thrown by the implementation. |
| * IOExceptions are expected and will automatically cause a retry of the |
| * segment opening logic with the newly revised segments. |
| * */ |
| public abstract PointsReader fieldsReader(SegmentReadState state) throws IOException; |
| |
| /** A {@code PointsFormat} that has nothing indexed */ |
| public static final PointsFormat EMPTY = new PointsFormat() { |
| @Override |
| public PointsWriter fieldsWriter(SegmentWriteState state) { |
| throw new UnsupportedOperationException(); |
| } |
| |
| @Override |
| public PointsReader fieldsReader(SegmentReadState state) { |
| return new PointsReader() { |
| @Override |
| public void close() { |
| } |
| |
| @Override |
| public long ramBytesUsed() { |
| return 0L; |
| } |
| |
| @Override |
| public void checkIntegrity() { |
| } |
| |
| @Override |
| public PointValues getValues(String field) { |
| throw new IllegalArgumentException("field=\"" + field + "\" was not indexed with points"); |
| } |
| }; |
| } |
| }; |
| } |