LogicUtils.java

package com.laytonsmith.PureUtilities.Common;

/**
 * Provides various functions for making some logic statements easier to read.
 * 
 */
public class LogicUtils {
	
	public static Compare get(Object obj){
		return new Compare(obj);
	}
	public static class Compare{
		Object obj;
		Compare(Object obj){
			this.obj = obj;
		}
		
		/**
		 * Returns true if the element is equals to ANY value in the list.
		 * LogicUtils.get(a).equalsAny(b, c, d) is equivalent to a == b || a == c || a == d
		 * @param o
		 * @return 
		 */
		public boolean equalsAny(Object ... o){
			if(obj == null){
				for(Object oo : o){
					if(oo == null){
						return true;
					}
				}
				return false;
			}
			for(Object oo : o){
				if(obj.equals(oo)){
					return true;
				}
			}
			return false;
		}
		
		/**
		 * Returns true if the element is equal to NONE of the values on the list.
		 * LogicUtils.get(a).equalsNone(b, c, d) is equivalent to a != b && a != c && a != d
		 */
		public boolean equalsNone(Object ... o){
			if(obj == null){
				for(Object oo : o){
					if(oo == null){
						return false;
					}
				}
				return true;
			}
			for(Object oo : o){
				if(obj.equals(oo)){
					return false;
				}
			}
			return true;
		}

		/**
		 * Returns true if the elements are equal
		 * @param obj
		 * @return 
		 */
		@Override
		public boolean equals(Object o) {
			if(!(o instanceof Compare)){
				return false;
			}
			if(obj == null){
				return obj == o;
			} else {
				return obj.equals(o);
			}
		}				

		@Override
		public int hashCode() {
			if(obj == null){
				return 0;
			} else {
				return obj.hashCode();
			}
		}
		
	}
}