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package com.netscape.sasl;

import java.util.Hashtable;
import javax.security.auth.callback.CallbackHandler;

/**
 * An interface for creating instances of <tt>SaslClient</tt>.
 * 
 * @see SaslClient
 * @see Sasl
 */
public abstract interface SaslClientFactory {
    /**
     * Creates a SaslClient using the parameters supplied.
     *
     * @param mechanisms The non-null list of mechanism names to try. Each is the
     * IANA-registered name of a SASL mechanism. (e.g. "GSSAPI", "CRAM-MD5").
     * @param authorizationId The possibly null authorization ID to use. When
     * the SASL authentication completes successfully, the entity named
     * by authorizationId is granted access. 
     * @param protocol The non-null string name of the protocol for which
     * the authentication is being performed (e.g., "ldap").
     * @param serverName The non-null string name of the server to which
     * we are creating an authenticated connection.
     * @param props The possibly null properties to be used by the SASL
     * mechanisms to configure the authentication exchange. For example,
     * "javax.security.sasl.encryption.maximum" might be used to specify
     * the maximum key length to use for encryption.
     * @param cbh The possibly null callback handler to used by the SASL
     * mechanisms to get further information from the application/library
     * to complete the authentication. For example, a SASL mechanism might
     * require the authentication ID and password from the caller.
     *@return A possibly null <tt>SaslClient</tt> created using the parameters
     * supplied. If null, this factory cannot produce a <tt>SaslClient</tt>
     * using the parameters supplied.
     *@exception SaslException If cannot create a <tt>SaslClient</tt> because
     * of an error.
     */
    public abstract SaslClient createSaslClient(
	String[] mechanisms,
	String authorizationId,
	String protocol,
	String serverName,
	Hashtable props,
	CallbackHandler cbh) throws SaslException;

    /**
     * Returns an array of names of mechanisms supported by this factory.
     * @return A non-null array containing a IANA-registered SASL mechanism names.
     */
    public abstract String[] getMechanismNames();
}
