| /* |
| * 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.compile; |
| |
| import java.sql.SQLException; |
| |
| import org.apache.phoenix.expression.ColumnExpression; |
| import org.apache.phoenix.parse.ColumnParseNode; |
| import org.apache.phoenix.schema.ColumnRef; |
| |
| /** |
| * Used to check if the expression being compiled is a {@link ColumnExpression} |
| */ |
| public class IndexExpressionCompiler extends ExpressionCompiler { |
| |
| // |
| private ColumnRef columnRef; |
| |
| public IndexExpressionCompiler(StatementContext context) { |
| super(context); |
| this.columnRef = null; |
| } |
| |
| @Override |
| public void reset() { |
| super.reset(); |
| this.columnRef = null; |
| } |
| |
| @Override |
| protected ColumnRef resolveColumn(ColumnParseNode node) throws SQLException { |
| ColumnRef columnRef = super.resolveColumn(node); |
| if (isTopLevel()) { |
| this.columnRef = columnRef; |
| } |
| return columnRef; |
| } |
| |
| /** |
| * @return if the expression being compiled is a regular column the column ref, else is null |
| */ |
| public ColumnRef getColumnRef() { |
| return columnRef; |
| } |
| |
| } |