BooleanOperator.java

package fr.openwide.core.wicket.more.condition;

public enum BooleanOperator {
	AND {
		@Override protected boolean isDecisiveOperand(boolean operand) { return operand == false; }
		@Override protected boolean getResultWhenDecisiveOperandMet() { return false; }
	},
	OR {
		@Override protected boolean isDecisiveOperand(boolean operand) { return operand == true; }
		@Override protected boolean getResultWhenDecisiveOperandMet() { return true; }
	},
	NOR {
		@Override protected boolean isDecisiveOperand(boolean operand) { return operand == true; }
		@Override protected boolean getResultWhenDecisiveOperandMet() { return false; }
	},
	NAND {
		@Override protected boolean isDecisiveOperand(boolean operand) { return operand == false; }
		@Override protected boolean getResultWhenDecisiveOperandMet() { return true; }
	};
	
	protected abstract boolean isDecisiveOperand(boolean operand);
	protected abstract boolean getResultWhenDecisiveOperandMet();
	
	public boolean apply(Iterable<? extends Condition> conditions) {
		for (Condition condition : conditions) {
			if (isDecisiveOperand(condition.applies())) {
				return getResultWhenDecisiveOperandMet();
			}
		}
		return !getResultWhenDecisiveOperandMet();
	}
}