| /* |
| * 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 java.io.IOException; |
| |
| public class OrNode implements Node { |
| |
| private Node leftChild; |
| private Node rightChild; |
| |
| private boolean hasCachedLeftTime; |
| private long cachedLeftTime; |
| private boolean hasCachedRightTime; |
| private long cachedRightTime; |
| private boolean ascending = true; |
| |
| public OrNode(Node leftChild, Node rightChild) { |
| this.leftChild = leftChild; |
| this.rightChild = rightChild; |
| this.hasCachedLeftTime = false; |
| this.hasCachedRightTime = false; |
| } |
| |
| public OrNode(Node leftChild, Node rightChild, boolean ascending) { |
| this.leftChild = leftChild; |
| this.rightChild = rightChild; |
| this.hasCachedLeftTime = false; |
| this.hasCachedRightTime = false; |
| this.ascending = ascending; |
| } |
| |
| @Override |
| public boolean hasNext() throws IOException { |
| if (hasCachedLeftTime || hasCachedRightTime) { |
| return true; |
| } |
| return leftChild.hasNext() || rightChild.hasNext(); |
| } |
| |
| private boolean hasLeftValue() throws IOException { |
| return hasCachedLeftTime || leftChild.hasNext(); |
| } |
| |
| private long getLeftValue() throws IOException { |
| if (hasCachedLeftTime) { |
| hasCachedLeftTime = false; |
| return cachedLeftTime; |
| } |
| return leftChild.next(); |
| } |
| |
| private boolean hasRightValue() throws IOException { |
| return hasCachedRightTime || rightChild.hasNext(); |
| } |
| |
| private long getRightValue() throws IOException { |
| if (hasCachedRightTime) { |
| hasCachedRightTime = false; |
| return cachedRightTime; |
| } |
| return rightChild.next(); |
| } |
| |
| @Override |
| public long next() throws IOException { |
| if (hasLeftValue() && !hasRightValue()) { |
| return getLeftValue(); |
| } else if (!hasLeftValue() && hasRightValue()) { |
| return getRightValue(); |
| } else if (hasLeftValue() && hasRightValue()) { |
| long leftValue = getLeftValue(); |
| long rightValue = getRightValue(); |
| if (ascending) { |
| return popAndFillNextCache( |
| leftValue < rightValue, leftValue > rightValue, leftValue, rightValue); |
| } |
| return popAndFillNextCache( |
| leftValue > rightValue, leftValue < rightValue, leftValue, rightValue); |
| } |
| throw new IOException("no more data"); |
| } |
| |
| private long popAndFillNextCache(boolean popLeft, boolean popRight, long left, long right) { |
| if (popLeft) { |
| hasCachedRightTime = true; |
| cachedRightTime = right; |
| return left; |
| } else if (popRight) { |
| hasCachedLeftTime = true; |
| cachedLeftTime = left; |
| return right; |
| } else { |
| return left; |
| } |
| } |
| |
| @Override |
| public NodeType getType() { |
| return NodeType.OR; |
| } |
| } |