| /* |
| * 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.phoenix.util; |
| |
| import java.sql.SQLException; |
| import java.util.HashSet; |
| import java.util.Set; |
| |
| import org.apache.phoenix.parse.ColumnParseNode; |
| import org.apache.phoenix.parse.FamilyWildcardParseNode; |
| import org.apache.phoenix.parse.OrderByNode; |
| import org.apache.phoenix.parse.ParseNodeVisitor; |
| import org.apache.phoenix.parse.SelectStatement; |
| import org.apache.phoenix.parse.AliasedNode; |
| import org.apache.phoenix.parse.ParseNode; |
| import org.apache.phoenix.parse.StatelessTraverseAllParseNodeVisitor; |
| import org.apache.phoenix.parse.TableWildcardParseNode; |
| import org.apache.phoenix.parse.WildcardParseNode; |
| |
| public class ParseNodeUtil { |
| |
| /** |
| * Apply the {@link ParseNodeVisitor} to every part of the {@link SelectStatement}. |
| * @param selectStatement |
| * @param parseNodeVisitor |
| * @throws SQLException |
| */ |
| public static <T> void applyParseNodeVisitor(SelectStatement selectStatement, ParseNodeVisitor<T> parseNodeVisitor) throws SQLException { |
| applyParseNodeVisitor(selectStatement, parseNodeVisitor, true); |
| } |
| |
| /** |
| * Apply the {@link ParseNodeVisitor} to every part of the {@link SelectStatement}. |
| * @param selectStatement |
| * @param parseNodeVisitor |
| * @param applyWhere |
| * @throws SQLException |
| */ |
| public static <T> void applyParseNodeVisitor( |
| SelectStatement selectStatement, |
| ParseNodeVisitor<T> parseNodeVisitor, |
| boolean applyWhere) throws SQLException { |
| |
| for (AliasedNode selectAliasedNode : selectStatement.getSelect()) { |
| selectAliasedNode.getNode().accept(parseNodeVisitor); |
| } |
| |
| if (selectStatement.getGroupBy() != null) { |
| for (ParseNode groupByParseNode : selectStatement.getGroupBy()) { |
| groupByParseNode.accept(parseNodeVisitor); |
| } |
| } |
| |
| if (selectStatement.getHaving() != null) { |
| selectStatement.getHaving().accept(parseNodeVisitor); |
| } |
| |
| if (selectStatement.getOrderBy() != null) { |
| for (OrderByNode orderByNode : selectStatement.getOrderBy()) { |
| orderByNode.getNode().accept(parseNodeVisitor); |
| } |
| } |
| |
| if(applyWhere && selectStatement.getWhere() != null) { |
| selectStatement.getWhere().accept(parseNodeVisitor); |
| } |
| } |
| |
| /** |
| * Collect referenced columnNames in selectStatement, the selectStatement is a single table query, not a join. |
| * @param selectStatement |
| * @return |
| * @throws SQLException |
| */ |
| public static Set<String> collectReferencedColumnNamesForSingleTable(SelectStatement selectStatement) throws SQLException{ |
| SingleTableCollectColumnNameParseNodeVisitor collectColumnNameParseNodeVisitor = |
| new SingleTableCollectColumnNameParseNodeVisitor(); |
| applyParseNodeVisitor(selectStatement, collectColumnNameParseNodeVisitor); |
| boolean isWildcard = collectColumnNameParseNodeVisitor.isWildcard(); |
| if(isWildcard) { |
| return null; |
| } |
| return collectColumnNameParseNodeVisitor.getReferenceColumnNames(); |
| } |
| |
| private static class SingleTableCollectColumnNameParseNodeVisitor extends StatelessTraverseAllParseNodeVisitor { |
| private final Set<String> referenceColumnNames; |
| private boolean wildcard = false; |
| |
| public SingleTableCollectColumnNameParseNodeVisitor() { |
| this.referenceColumnNames = new HashSet<String>(); |
| } |
| |
| public Set<String> getReferenceColumnNames() { |
| return this.referenceColumnNames; |
| } |
| |
| public boolean isWildcard() { |
| return wildcard; |
| } |
| |
| @Override |
| public Void visit(ColumnParseNode columnParseNode) throws SQLException { |
| String normalizedColumnName = SchemaUtil.getNormalizedColumnName(columnParseNode); |
| referenceColumnNames.add(normalizedColumnName); |
| return null; |
| } |
| |
| @Override |
| public Void visit(WildcardParseNode node) throws SQLException { |
| this.wildcard = true; |
| return null; |
| } |
| |
| @Override |
| public Void visit(TableWildcardParseNode node) throws SQLException { |
| this.wildcard = true; |
| return null; |
| } |
| |
| @Override |
| public Void visit(FamilyWildcardParseNode node) throws SQLException { |
| this.wildcard = true; |
| return null; |
| } |
| } |
| } |