/* ========================================================================
 * PlantUML : a free UML diagram generator
 * ========================================================================
 *
 * (C) Copyright 2009-2024, Arnaud Roques
 *
 * Project Info:  https://plantuml.com
 *
 * If you like this project or if you find it useful, you can support us at:
 *
 * https://plantuml.com/patreon (only 1$ per month!)
 * https://plantuml.com/paypal
 *
 * This file is part of PlantUML.
 *
 * PlantUML is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (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,
 * USA.
 *
 *
 * Original Author:  Arnaud Roques
 *
 */
package net.sourceforge.plantuml.tim;

import java.util.Collections;
import java.util.Objects;
import java.util.Set;
import java.util.concurrent.atomic.AtomicInteger;

public class TFunctionSignature {

	private final String functionName;
	private final int nbArg;
	private final Set<String> namedArguments;

	public TFunctionSignature(String functionName, int nbArg) {
		this(functionName, nbArg, Collections.<String>emptySet());
	}

	public TFunctionSignature(String functionName, int nbArg, Set<String> namedArguments) {
		this.functionName = Objects.requireNonNull(functionName);
		this.nbArg = nbArg;
		this.namedArguments = namedArguments;
	}

	public boolean sameFunctionNameAs(TFunctionSignature other) {
		return getFunctionName().equals(other.getFunctionName());
	}

	@Override
	public String toString() {
		return functionName + "/" + nbArg + " " + namedArguments;
	}

	private final AtomicInteger cachedHashCode = new AtomicInteger();

	@Override
	public int hashCode() {

		int currentHash = cachedHashCode.get();
		if (currentHash != 0)
			return currentHash;

		final int prime = 31;
		int result = 1;
		result = prime * result + functionName.hashCode();
		result = prime * result + nbArg;
		cachedHashCode.set(result);
		return result;
	}

	@Override
	public boolean equals(Object obj) {
		final TFunctionSignature other = (TFunctionSignature) obj;
		return functionName.equals(other.functionName) && nbArg == other.nbArg;
	}

	public final String getFunctionName() {
		return functionName;
	}

	public final int getNbArg() {
		return nbArg;
	}

	public final Set<String> getNamedArguments() {
		return namedArguments;
	}
}
