DeleteResult.java

/**
 * 
 */
package de.zib.scalaris;

import com.ericsson.otp.erlang.OtpErlangAtom;
import com.ericsson.otp.erlang.OtpErlangList;

/**
 * Stores the result of a delete operation.
 * 
 * @author Nico Kruber, kruber@zib.de
 * @version 2.2
 * @since 2.2
 * 
 * @see Scalaris#delete(String)
 */
public class DeleteResult {
	/**
	 * Number of successfully deleted replicas.
	 */
	public int ok = 0;
	/**
	 * Skipped replicas because locks were set.
	 */
	public int locks_set = 0;
	/**
	 * Skipped replicas because they did not exist.
	 */
	public int undef = 0;

	/**
	 * Creates a delete state object by converting the result list returned from
	 * erlang.
	 * 
	 * @param list
	 *            the list to convert
	 * @throws UnknownException
	 *             is thrown if an unknown reason was encountered
	 */
	public DeleteResult(OtpErlangList list) throws UnknownException {
		if (list != null) {
			for (int i = 0; i < list.arity(); ++i) {
				OtpErlangAtom element = (OtpErlangAtom) list.elementAt(i);
				if (element.equals(new OtpErlangAtom("ok"))) {
					++ok;
				} else if (element.equals(new OtpErlangAtom("locks_set"))) {
					++locks_set;
				} else if (element.equals(new OtpErlangAtom("undef"))) {
					++undef;
				} else {
					throw new UnknownException("Unknow reason: "
							+ element.atomValue());
				}
			}
		}
	}
}