package foundation.data.meta.field;

import java.util.HashSet;
import java.util.Set;

import foundation.util.Util;

public class BooleanPrefix {

	protected static Set<String> items; 
	
	static {
		items = new HashSet<String>();
		items.add("is");
		items.add("exists");
		items.add("has");
	}
	
	public static boolean contains(String fieldName) {
		if (Util.isEmpty(fieldName)) {
			return false;
		}
		
		fieldName = fieldName.toLowerCase();
		int pos = fieldName.indexOf("_");
		
		if (pos <= 0) {
			return false;
		}
		
		String prefix = fieldName.substring(0, pos);
		boolean contains = items.contains(prefix);
		
		if (contains) {
			return true;
		}
		
		pos = fieldName.indexOf("_is_");
		return pos > 0;
	}
}