Tuple.java

/*
  Tuple.java

  (c) 2010-2012 Edward Swartz

  All rights reserved. This program and the accompanying materials
  are made available under the terms of the Eclipse Public License v1.0
  which accompanies this distribution, and is available at
  http://www.eclipse.org/legal/epl-v10.html
 */
package ejs.base.utils;

/**
 * A tuple of zero or more items.
 * @author eswartz
 *
 */
public class Tuple {
	private Object[] args;

	public Tuple(Object... args) {
		this.args = args;
	}

	public Object get(int index) {
		return args[index];
	}
	
	/* (non-Javadoc)
	 * @see java.lang.Object#equals(java.lang.Object)
	 */
	@Override
	public boolean equals(Object obj) {
		if (obj == this)
			return true;
		if (!(obj instanceof Tuple))
			return false;
		Object[] otherArgs = ((Tuple) obj).args;
		if (args.length != otherArgs.length)
			return false;
		for (int i = 0; i < otherArgs.length; i++) {
			if (!(args[i] == null && otherArgs[i] == null)
				&& !(args[i] != null && otherArgs[i] != null && args[i].equals(otherArgs[i]))	)
				return false;
		}
		return true;
	}
	
	/* (non-Javadoc)
	 * @see java.lang.Object#hashCode()
	 */
	@Override
	public int hashCode() {
		int hashCode = 0x12345678;
		for (int i = 0; i < args.length; i++) {
			hashCode ^= (args[i] != null ? args[i].hashCode() : 0);
		}
		return hashCode;
	}
}