/**
* 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.hive.service.auth.ldap;
import com.google.common.collect.ImmutableList;
import java.util.ArrayList;
import java.util.List;
import javax.security.sasl.AuthenticationException;
import org.apache.hadoop.hive.conf.HiveConf;
/**
* A factory that produces a {@link Filter} that is implemented as a chain of other filters.
* The chain of filters are created as a result of
* {@link #getInstance(org.apache.hadoop.hive.conf.HiveConf) }
* method call. The resulting object filters out all users that don't pass <b>all</b>
* chained filters. The filters will be applied in the order they are mentioned in the factory
* constructor.
*/
public class ChainFilterFactory implements FilterFactory {
private final List<FilterFactory> chainedFactories;
/**
* Constructs a factory for a chain of filters.
*
* @param factories The array of factories that will be used to construct a chain of filters.
*/
public ChainFilterFactory(FilterFactory... factories) {
this.chainedFactories = ImmutableList.copyOf(factories);
}
/**
* {@inheritDoc}
*/
@Override
public Filter getInstance(HiveConf conf) {
List<Filter> filters = new ArrayList<>();
for (FilterFactory factory : chainedFactories) {
Filter filter = factory.getInstance(conf);
if (filter != null) {
filters.add(filter);
}
}
return filters.isEmpty() ? null : new ChainFilter(ImmutableList.copyOf(filters));
}
private static final class ChainFilter implements Filter {
private final List<Filter> chainedFilters;
public ChainFilter(List<Filter> chainedFilters) {
this.chainedFilters = chainedFilters;
}
@Override
public void apply(DirSearch client, String user) throws AuthenticationException {
for (Filter filter : chainedFilters) {
filter.apply(client, user);
}
}
}
}