/*
 * Copyright 2023 the original author or authors.
 *
 * Licensed 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
 *
 *      https://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.springframework.shell.command.parser;

import java.util.ArrayList;
import java.util.List;

/**
 * {@code Nonterminal} node means that it can have children and doesn't
 * necessarily terminal {@code ast tree branch}.
 *
 * @author Janne Valkealahti
 */
public abstract sealed class NonterminalAstNode extends AstNode permits CommandNode, OptionNode {

	private final List<AstNode> children = new ArrayList<>();

	public NonterminalAstNode(Token token) {
		super(token);
	}

	public List<AstNode> getChildren() {
		return children;
	}

	void addChildNode(AstNode node) {
		this.children.add(node);
	}
}
