Licensed to the Apache Software Foundation (ASF) under one or more
 contributor license agreements.  See the NOTICE file distributed with
 this work for additional information regarding copyright ownership.
 The ASF licenses this file to You under the Apache License, Version 2.0
 (the "License"); you may not use this file except in compliance with
 the License.  You may obtain a copy of the License at
    http://www.apache.org/licenses/LICENSE-2.0
 Unless required by applicable law or agreed to in writing, software
 distributed under the License is distributed on an "AS IS" BASIS,
 WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 See the License for the specific language governing permissions and
 limitations under the License.
/**
 *  Licensed to the Apache Software Foundation (ASF) under one or more
 *  contributor license agreements.  See the NOTICE file distributed with
 *  this work for additional information regarding copyright ownership.
 *  The ASF licenses this file to You under the Apache License, Version 2.0
 *  (the "License"); you may not use this file except in compliance with
 *  the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS,
 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  See the License for the specific language governing permissions and
 *  limitations under the License.
 */
package org.apache.catalina.authenticator.jaspic;

import java.util.Map;

import javax.security.auth.callback.CallbackHandler;
import javax.security.auth.message.AuthException;
import javax.security.auth.message.config.AuthConfigFactory;
import javax.security.auth.message.config.AuthConfigProvider;
import javax.security.auth.message.config.ClientAuthConfig;
import javax.security.auth.message.config.ServerAuthConfig;

Basic implementation primarily intended for use when using third-party ServerAuthModule implementations that only provide the module. /**
 * Basic implementation primarily intended for use when using third-party
 * {@link javax.security.auth.message.module.ServerAuthModule} implementations
 * that only provide the module.
 */
public class SimpleAuthConfigProvider implements AuthConfigProvider {

    private final Map<String,String> properties;

    private volatile ServerAuthConfig serverAuthConfig;

    public SimpleAuthConfigProvider(Map<String,String> properties, AuthConfigFactory factory) {
        this.properties = properties;
        if (factory != null) {
            factory.registerConfigProvider(this, null, null, "Automatic registration");
        }
    }


    
{@inheritDoc}
 This implementation does not support client-side authentication and therefore always returns null. /**
     * {@inheritDoc}
     * <p>
     * This implementation does not support client-side authentication and
     * therefore always returns {@code null}.
     */
    @Override
    public ClientAuthConfig getClientAuthConfig(String layer, String appContext,
            CallbackHandler handler) throws AuthException {
        return null;
    }


    @Override
    public ServerAuthConfig getServerAuthConfig(String layer, String appContext,
            CallbackHandler handler) throws AuthException {
        ServerAuthConfig serverAuthConfig = this.serverAuthConfig;
        if (serverAuthConfig == null) {
            synchronized (this) {
                if (this.serverAuthConfig == null) {
                    this.serverAuthConfig = createServerAuthConfig(layer, appContext, handler, properties);
                }
                serverAuthConfig = this.serverAuthConfig;
            }
        }
        return serverAuthConfig;
    }


    protected ServerAuthConfig createServerAuthConfig(String layer, String appContext,
            CallbackHandler handler, Map<String,String> properties) {
        return new SimpleServerAuthConfig(layer, appContext, handler, properties);
    }


    @Override
    public void refresh() {
        ServerAuthConfig serverAuthConfig = this.serverAuthConfig;
        if (serverAuthConfig != null) {
            serverAuthConfig.refresh();
        }
    }
}