1 /*
2 * Licensed to the Apache Software Foundation (ASF) under one or more
3 * contributor license agreements. See the NOTICE file distributed with
4 * this work for additional information regarding copyright ownership.
5 * The ASF licenses this file to You under the Apache License, Version 2.0
6 * (the "License"); you may not use this file except in compliance with
7 * the License. You may obtain a copy of the License at
8 *
9 * http://www.apache.org/licenses/LICENSE-2.0
10 *
11 * Unless required by applicable law or agreed to in writing, software
12 * distributed under the License is distributed on an "AS IS" BASIS,
13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14 * See the License for the specific language governing permissions and
15 * limitations under the License.
16 */
17
18 package org.apache.shardingsphere.sql.parser.core;
19
20 import lombok.RequiredArgsConstructor;
21 import org.antlr.v4.runtime.CommonTokenStream;
22 import org.antlr.v4.runtime.Token;
23 import org.antlr.v4.runtime.tree.ParseTree;
24 import org.apache.shardingsphere.sql.parser.api.ASTNode;
25
26 import java.util.Collection;
27 import java.util.LinkedList;
28
29 /**
30 * Parse AST node.
31 */
32 @RequiredArgsConstructor
33 public final class ParseASTNode implements ASTNode {
34
35 private final ParseTree parseTree;
36
37 private final CommonTokenStream tokenStream;
38
39 /**
40 * Get root node.
41 *
42 * @return root node
43 */
44 public ParseTree getRootNode() {
45 return parseTree.getChild(0);
46 }
47
48 /**
49 * Get hidden tokens.
50 *
51 * @return hidden tokens
52 */
53 public Collection<Token> getHiddenTokens() {
54 Collection<Token> result = new LinkedList<>();
55 for (Token each : tokenStream.getTokens()) {
56 if (Token.HIDDEN_CHANNEL == each.getChannel()) {
57 result.add(each);
58 }
59 }
60 return result;
61 }
62 }