package org.msh.reports.datatable;


public class DataTableUtils {
	
	
	/**
	 * Compare an array of object
	 * @param vals1
	 * @param vals2
	 * @return
	 */
	public static int compareArray(Object[] vals1, Object[] vals2) {
		int len = vals1.length;
		if (vals2.length != len)
			return ((Integer)len).compareTo(vals2.length);

		int res = 0;
		for (int i = 0; i < len; i++) {
			res = compareObjects(vals1[i], vals2[i]);
			if (res != 0)
				break;
		}
		return res;
	}

	
	/**
	 * Compare two objects. The objects are considered of the same type. It uses the {@link Comparable} interface
	 * if the first object implements it, otherwise they are converted to string and compared 
	 * @param obj1
	 * @param obj2
	 * @return
	 */
	protected static int compareObjects(Object obj1, Object obj2) {
		if (obj1 == obj2)
			return 0;

		if (obj1 == null)
			return -1;
		
		if (obj2 == null)
			return 1;

		if ((obj1 instanceof Comparable) && (obj1.getClass() == obj2.getClass()))
			 return ((Comparable)obj1).compareTo(obj2);
		else return obj1.toString().compareTo(obj2.toString());
	}
	
	/**
	 * Check if both array of objects are equals
	 * @param vals1
	 * @param vals2
	 * @return
	 */
/*	public static boolean equalValues(Object[] vals1, Object[] vals2) {
		int len = vals1.length;
		if (vals2.length != len)
			return false;
		
		for (int i = 0; i < len; i++)
			if (!equalValue(vals1[i], vals2[i]))
				return false;
		return true;
	}
*/

	/**
	 * Check if two objects are equals. If they are not equals testing the equals operator,
	 * a test using the <code>equals()</code> is applied. It also checks null pointers.
	 * 
	 * @param val1 object to be compared
	 * @param val2 object to be compared
	 * @return true if they are the same
	 */
	public static boolean equalValue(Object val1, Object val2) {
		if (val1 == val2)
			return true;

		if ((val1 == null) || (val2 == null))
			return false;

		return (val1.equals(val2));
	}
}