package routines;

import java.util.HashMap;
import java.util.Map;

public class TalendStringUtil<T,Y> {
	
	
	/**
	 * Searches a port for a value you specify. If the function finds the value, it returns a result value, which you define.
	 *  You can build an unlimited number of searches within a DECODE function.
	 * 
	 * @param value : Passes the values you want to search
	 * @param defaultValue : The value you want to return if the search does not find a matching value.
	 * @param search : a Map contains the search-value & result-value.
	 * @return result-value if the search finds a matching value. Default-value if the search does not find a matching value.
	 * 
	 *  PS:You cannot create a DECODE function with both string and numeric return
	 * values. When you validate the expression above, you receive the following
	 * mismatching datatypes.
	 */
	public Y DECODE(T value, Y defaultValue, Map<T, Y> search) {
		if (search.containsKey(value)) {
			return search.get(value);
		} else {
			return defaultValue;
		}
	}
	
	/**
	 * Searches a port for a value you specify. If the function finds the value, it returns a result value, which you define. 
	 * You can build an unlimited number of searches within a DECODE function.
	 * 
	 * @param value : Passes the values you want to search
	 * @param defaultValue : The value you want to return if the search does not find a matching value.
	 * @param search : a Map contains the search-value & result-value.
	 * @param searchAndResult : pairs of search-value & result-value. You can enter one or more pairs of values.
	 * @return result-value if the search finds a matching value. Default-value if the search does not find a matching value.
	 */
	public Y DECODE(T value, Y defaultValue, T... searchAndResult) {
		if (searchAndResult.length % 2 != 0) {
			throw new IllegalArgumentException("Parameter searchAndResult should be in pair.");
		}
		Map<T, Y> search = new HashMap<T, Y>();
		for (int i = 0; i < searchAndResult.length; i += 2) {
			search.put(searchAndResult[i], (Y) searchAndResult[i + 1]);
		}
		return DECODE(value, defaultValue, search);
	}

}