| /* |
| * 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.druid.segment; |
| |
| import org.apache.druid.query.monomorphicprocessing.RuntimeShapeInspector; |
| import org.apache.druid.segment.data.Offset; |
| import org.apache.druid.segment.data.ReadableOffset; |
| |
| public class SimpleDescendingOffset extends Offset |
| { |
| private final int rowCount; |
| private final int initialOffset; |
| private int currentOffset; |
| |
| SimpleDescendingOffset(int rowCount) |
| { |
| this(rowCount - 1, rowCount); |
| } |
| |
| private SimpleDescendingOffset(int initialOffset, int rowCount) |
| { |
| this.rowCount = rowCount; |
| this.initialOffset = initialOffset; |
| this.currentOffset = initialOffset; |
| } |
| |
| @Override |
| public void increment() |
| { |
| currentOffset--; |
| } |
| |
| @Override |
| public boolean withinBounds() |
| { |
| return currentOffset >= 0; |
| } |
| |
| @Override |
| public void reset() |
| { |
| currentOffset = initialOffset; |
| } |
| |
| @Override |
| public ReadableOffset getBaseReadableOffset() |
| { |
| return this; |
| } |
| |
| @Override |
| public Offset clone() |
| { |
| return new SimpleDescendingOffset(currentOffset, rowCount); |
| } |
| |
| @Override |
| public int getOffset() |
| { |
| return currentOffset; |
| } |
| |
| @Override |
| public String toString() |
| { |
| return currentOffset + "/" + rowCount + "(DSC)"; |
| } |
| |
| @Override |
| public void inspectRuntimeShape(RuntimeShapeInspector inspector) |
| { |
| // nothing to inspect |
| } |
| } |