package morphology.parser;

import java.util.regex.*;

/**
 * Encapsulation of transducer rules.
 *
 * Project: NGSLT --> NLP --> Words --> Assignment #1
 * @author Normunds Grūzītis, Gunta Nešpore, Baiba Saulīte
 * @version February-March 2006
 */
public class RegExRule {

	private String pIf;
	private String pThen;
	private int order;

	/**
	 * Constructor.
	 * @param r_if pattern of recognizer.
	 * @param r_then pattern of transducer.
	 */
	public RegExRule(int order, String r_if, String r_then) {
		try {
			//Test.
			Pattern.compile(r_if);
			Pattern.compile(r_then);
			
			pIf = r_if;
			pThen = r_then;
			this.order = order;
		}
		catch (PatternSyntaxException e) {
			pIf = "";
			pThen = "";
		}
	}

	/**
	 * Gets indication at which stage to apply the rule.
	 * @return number of order.
	 */
	public int getOrder() {
		return order;
	}

	/**
	 * Gets rule-recognizer.
	 * @return non-compiled pattern.
	 */
	public String getIF() {
		return pIf;
	}

	/**
	 * Gets compiled rule-transducer.
	 * @return non-compiled pattern.
	 */
	public String getTHEN() {
		return pThen;
	}

}