| /* |
| * 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.iotdb.tsfile.read.query.timegenerator.node; |
| |
| import org.apache.iotdb.tsfile.read.common.BatchData; |
| import org.apache.iotdb.tsfile.read.reader.IBatchReader; |
| |
| import java.io.IOException; |
| |
| public class LeafNode implements Node { |
| |
| private IBatchReader reader; |
| |
| private BatchData cacheData; |
| private boolean hasCached; |
| |
| private long cachedTime; |
| private Object cachedValue; |
| |
| public LeafNode(IBatchReader reader) { |
| this.reader = reader; |
| } |
| |
| @Override |
| public boolean hasNext() throws IOException { |
| if (hasCached) { |
| return true; |
| } |
| if (cacheData != null && cacheData.hasCurrent()) { |
| cachedTime = cacheData.currentTime(); |
| cachedValue = cacheData.currentValue(); |
| hasCached = true; |
| return true; |
| } |
| while (reader.hasNextBatch()) { |
| cacheData = reader.nextBatch(); |
| if (cacheData.hasCurrent()) { |
| cachedTime = cacheData.currentTime(); |
| cachedValue = cacheData.currentValue(); |
| hasCached = true; |
| return true; |
| } |
| } |
| return false; |
| } |
| |
| @Override |
| public long next() throws IOException { |
| if ((hasCached || hasNext())) { |
| hasCached = false; |
| cacheData.next(); |
| return cachedTime; |
| } |
| throw new IOException("no more data"); |
| } |
| |
| /** |
| * Check whether the current time equals the given time. |
| * |
| * @param time the given time |
| * @return True if the current time equals the given time. False if not. |
| */ |
| public boolean currentTimeIs(long time) { |
| return cachedTime == time; |
| } |
| |
| /** Function for getting the value at the given time. */ |
| public Object currentValue() { |
| return cachedValue; |
| } |
| |
| @Override |
| public NodeType getType() { |
| return NodeType.LEAF; |
| } |
| } |