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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.  Oracle designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Oracle in the LICENSE file that accompanied this code.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
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 *
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package javax.security.auth.login;

/**
 * This class defines the <i>Service Provider Interface</i> (<b>SPI</b>)
 * for the <code>Configuration</code> class.
 * All the abstract methods in this class must be implemented by each
 * service provider who wishes to supply a Configuration implementation.
 *
 * <p> Subclass implementations of this abstract class must provide
 * a public constructor that takes a <code>Configuration.Parameters</code>
 * object as an input parameter.  This constructor also must throw
 * an IllegalArgumentException if it does not understand the
 * <code>Configuration.Parameters</code> input.
 *
 *
 * @since 1.6
 */

public abstract class ConfigurationSpi {
    /**
     * Retrieve the AppConfigurationEntries for the specified <i>name</i>.
     *
     * <p>
     *
     * @param name the name used to index the Configuration.
     *
     * @return an array of AppConfigurationEntries for the specified
     *          <i>name</i>, or null if there are no entries.
     */
    protected abstract AppConfigurationEntry[] engineGetAppConfigurationEntry
                                                        (String name);

    /**
     * Refresh and reload the Configuration.
     *
     * <p> This method causes this Configuration object to refresh/reload its
     * contents in an implementation-dependent manner.
     * For example, if this Configuration object stores its entries in a file,
     * calling <code>refresh</code> may cause the file to be re-read.
     *
     * <p> The default implementation of this method does nothing.
     * This method should be overridden if a refresh operation is supported
     * by the implementation.
     *
     * @exception SecurityException if the caller does not have permission
     *          to refresh its Configuration.
     */
    protected void engineRefresh() { }
}