| /* |
| * 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.db.schemaengine.schemaregion.view; |
| |
| import org.apache.iotdb.commons.path.PartialPath; |
| import org.apache.iotdb.db.exception.metadata.view.UnsupportedViewException; |
| import org.apache.iotdb.db.exception.metadata.view.ViewContainsAggregationException; |
| import org.apache.iotdb.db.queryengine.plan.expression.Expression; |
| import org.apache.iotdb.db.queryengine.plan.expression.leaf.TimeSeriesOperand; |
| import org.apache.iotdb.db.queryengine.plan.expression.visitor.CollectAggregationExpressionsVisitor; |
| import org.apache.iotdb.tsfile.utils.Pair; |
| |
| import java.util.ArrayList; |
| import java.util.List; |
| |
| /** |
| * A class to save all paths' info in targetPaths and sourcePaths except query statement. |
| * |
| * <p>fullPathList: CREATE VIEW root.db.device.temp AS root.ln.d.s01 PathGroup: CREATE VIEW |
| * root.db(device.temp, status) AS root.ln(d.s01, wf.abc.s02) |
| */ |
| public class ViewPaths { |
| public ViewPathType viewPathType = ViewPathType.FULL_PATH_LIST; |
| public List<PartialPath> fullPathList = null; |
| public PartialPath prefixOfPathsGroup = null; |
| public List<PartialPath> suffixOfPathsGroup = null; |
| |
| public List<Expression> expressionsList = null; |
| |
| public void addPath(PartialPath path) { |
| if (this.fullPathList == null) { |
| this.fullPathList = new ArrayList<>(); |
| this.fullPathList.add(path); |
| } else { |
| this.fullPathList.add(path); |
| } |
| } |
| |
| public void setFullPathList(List<PartialPath> pathList) { |
| this.fullPathList = pathList; |
| } |
| |
| public void setPrefixOfPathsGroup(PartialPath path) { |
| this.prefixOfPathsGroup = path; |
| } |
| |
| public void setSuffixOfPathsGroup(List<PartialPath> pathList) { |
| this.suffixOfPathsGroup = pathList; |
| } |
| |
| public void setViewPathType(ViewPathType viewPathType) { |
| this.viewPathType = viewPathType; |
| } |
| |
| public void generateFullPathsFromPathsGroup() { |
| if (prefixOfPathsGroup != null && suffixOfPathsGroup != null) { |
| this.fullPathList = new ArrayList<>(); |
| for (PartialPath suffixPath : suffixOfPathsGroup) { |
| PartialPath pathToAdd = prefixOfPathsGroup.concatPath(suffixPath); |
| this.addPath(pathToAdd); |
| } |
| } |
| } |
| |
| public void generateExpressionsIfNecessary() { |
| if (this.viewPathType == ViewPathType.FULL_PATH_LIST |
| || this.viewPathType == ViewPathType.PATHS_GROUP) { |
| if (this.fullPathList != null) { |
| this.expressionsList = new ArrayList<>(); |
| for (PartialPath path : this.fullPathList) { |
| TimeSeriesOperand tsExpression = new TimeSeriesOperand(path); |
| this.expressionsList.add(tsExpression); |
| } |
| } |
| } else if (this.viewPathType == ViewPathType.QUERY_STATEMENT) { |
| // no nothing. expressions should be set by setExpressionsList |
| } else if (this.viewPathType == ViewPathType.BATCH_GENERATION) { |
| // source paths has no intoItem. target paths should not be converted to expression. |
| } |
| } |
| |
| /** |
| * Check all expression in this list, ensure that the views created using them are legal. Check |
| * follows above rules: 1. A legal view can NOT contain aggregation functions. |
| * |
| * @return If all check passed, return true; else return false with failure message. |
| */ |
| public static Pair<Boolean, UnsupportedViewException> checkExpressionList( |
| List<Expression> expressionsList) { |
| CollectAggregationExpressionsVisitor collectAggExpVisitor = |
| new CollectAggregationExpressionsVisitor(); |
| |
| for (Expression expression : expressionsList) { |
| List<Expression> aggList = collectAggExpVisitor.process(expression, null); |
| if (!aggList.isEmpty()) { |
| return new Pair<>(false, new ViewContainsAggregationException(aggList.get(0).toString())); |
| } |
| } |
| return new Pair<>(true, null); |
| } |
| |
| public void setExpressionsList(List<Expression> expressionsList) { |
| this.expressionsList = expressionsList; |
| } |
| // end of viewPaths |
| } |