IndentationStack.java

/* ========================================================================
 * PlantUML : a free UML diagram generator
 * ========================================================================
 *
 * (C) Copyright 2009-2024, Arnaud Roques
 *
 * Project Info:  https://plantuml.com
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 * PlantUML is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License as published by
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 * (at your option) any later version.
 *
 * PlantUML distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
 * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public
 * License for more details.
 *
 * You should have received a copy of the GNU General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301,
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 * Original Author:  Arnaud Roques
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 */
package net.sourceforge.plantuml.yaml.parser;

import java.util.ArrayDeque;
import java.util.Deque;

public class IndentationStack {

	private final Deque<Integer> stack = new ArrayDeque<>();

	public int size() {
		return stack.size();
	}

	public void push(int value) {
		if (size() > 0 && value <= peek())
			throw new IllegalArgumentException();

		stack.addLast(value);
	}

	public int peek() {
		return stack.getLast();
	}

	public int pop() {
		return stack.removeLast();
	}

	public boolean contains(int value) {
		return stack.contains(value);
	}
	
	@Override
	public String toString() {
		return stack.toString();
	}

}