| /** |
| * 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.atlas.hive.rewrite; |
| |
| import org.apache.hadoop.hive.ql.parse.ASTNode; |
| import org.apache.hadoop.hive.ql.parse.HiveParser; |
| |
| import java.util.HashMap; |
| import java.util.Map; |
| |
| public class LiteralRewriter implements ASTRewriter { |
| |
| public static Map<Integer, String> LITERAL_TOKENS = new HashMap<Integer, String>() {{ |
| put(HiveParser.Number, "NUMBER_LITERAL"); |
| put(HiveParser.Digit, "DIGIT_LITERAL"); |
| put(HiveParser.HexDigit, "HEX_LITERAL"); |
| put(HiveParser.Exponent, "EXPONENT_LITERAL"); |
| put(HiveParser.StringLiteral, "'STRING_LITERAL'"); |
| put(HiveParser.BigintLiteral, "BIGINT_LITERAL"); |
| put(HiveParser.SmallintLiteral, "SMALLINT_LITERAL"); |
| put(HiveParser.TinyintLiteral, "TINYINT_LITERAL"); |
| put(HiveParser.DecimalLiteral, "DECIMAL_LITERAL"); |
| put(HiveParser.ByteLengthLiteral, "BYTE_LENGTH_LITERAL"); |
| put(HiveParser.TOK_STRINGLITERALSEQUENCE, "'STRING_LITERAL_SEQ'"); |
| put(HiveParser.TOK_CHARSETLITERAL, "'CHARSET_LITERAL'"); |
| put(HiveParser.KW_TRUE, "BOOLEAN_LITERAL"); |
| put(HiveParser.KW_FALSE, "BOOLEAN_LITERAL"); |
| }}; |
| |
| |
| @Override |
| public void rewrite(RewriteContext ctx, final ASTNode node) throws RewriteException { |
| try { |
| processLiterals(ctx, node); |
| } catch(Exception e) { |
| throw new RewriteException("Could not normalize query", e); |
| } |
| } |
| |
| |
| private void processLiterals(final RewriteContext ctx, final ASTNode node) { |
| // Take child ident.totext |
| if (isLiteral(node)) { |
| replaceLiteral(ctx, node); |
| } |
| } |
| |
| private boolean isLiteral(ASTNode node) { |
| if (LITERAL_TOKENS.containsKey(node.getType())) { |
| return true; |
| } |
| return false; |
| } |
| |
| void replaceLiteral(RewriteContext ctx, ASTNode valueNode) { |
| //Reset the token stream |
| String literalVal = LITERAL_TOKENS.get(valueNode.getType()); |
| ctx.getTokenRewriteStream().replace(valueNode.getTokenStartIndex(), |
| valueNode.getTokenStopIndex(), literalVal); |
| } |
| } |