/*
 * Copyright (c) 2014, 2015, Dynatrace and/or its affiliates. All rights reserved.
 * 
 * This file is part of the Lock Contention Tracing Subsystem for the HotSpot
 * Virtual Machine, which is developed at Christian Doppler Laboratory on
 * Monitoring and Evolution of Very-Large-Scale Software Systems. Please
 * contact us at <http://mevss.jku.at/> if you need additional information
 * or have any questions.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.
 *
 * This code is 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
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work. If not, see <http://www.gnu.org/licenses/>.
 *
 */ 
package sun.evtracing.processing.statistics.metadata;

import java.util.Arrays;
import java.util.stream.Collectors;

import sun.evtracing.parser.metadata.JavaClass;

public class JavaClassStack {
	
	public static final JavaClassStack HIDDEN = new JavaClassStack(JavaClass.UNKNOWN) {
		@Override
		public boolean equals(Object obj) {
			return (this == obj);
		}
	};
	
	private final JavaClass[] classes;

	public JavaClassStack(JavaClass... classes) {
		this.classes = classes;
	}

	public JavaClass[] classes() {
		return classes;
	}

	@Override
	public int hashCode() {
		return Arrays.hashCode(classes);
	}

	@Override
	public boolean equals(Object obj) {
		if (this == obj)
			return true;
		if (obj == null || getClass() != obj.getClass())
			return false;

		JavaClassStack other = (JavaClassStack) obj;
		return Arrays.equals(classes, other.classes);
	}

	@Override
	public String toString() {
		return Arrays.stream(classes).map(c -> c.toString()).collect(Collectors.joining(", "));
	}
}