/*
 * 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.shardingsphere.sql.parser.core;

import org.antlr.v4.runtime.CommonTokenStream;
import org.antlr.v4.runtime.Token;
import org.antlr.v4.runtime.tree.ParseTree;
import org.apache.shardingsphere.sql.parser.api.visitor.ASTNode;

import java.util.Collection;
import java.util.LinkedList;
import java.util.stream.Collectors;

/**
 * Parse AST node.
 */
public final class ParseASTNode implements ASTNode {
    
    private final ParseTree parseTree;
    
    private final Collection<Token> hiddenTokens;
    
    public ParseASTNode(final ParseTree parseTree) {
        this.parseTree = parseTree;
        this.hiddenTokens = new LinkedList<>();
    }
    
    public ParseASTNode(final ParseTree parseTree, final CommonTokenStream tokenStream) {
        this.parseTree = parseTree;
        this.hiddenTokens = tokenStream.getTokens().stream().filter(each -> Token.HIDDEN_CHANNEL == each.getChannel()).collect(Collectors.toList());
    }
    
    /**
     * Get root node.
     * 
     * @return root node
     */
    public ParseTree getRootNode() {
        return parseTree.getChild(0);
    }
    
    /**
     * Get hidden tokens.
     *
     * @return token collection
     */
    public Collection<Token> getHiddenTokens() {
        return hiddenTokens;
    }
}
