package brickhouse.udf.bloom;
/**
* Copyright 2012 Klout, Inc
*
* Licensed 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.
*
**/
import java.util.HashMap;
import java.util.Map;
import org.apache.hadoop.hive.ql.exec.Description;
import org.apache.hadoop.hive.ql.exec.UDF;
import org.apache.hadoop.hive.ql.metadata.HiveException;
import org.apache.hadoop.util.bloom.BloomFilter;
import org.apache.hadoop.util.bloom.Filter;
import org.apache.hadoop.util.bloom.Key;
/**
* Returns true if the bloom (probably) contains the string
*
*
*/
@Description(
name = "bloom_contains",
value = " Returns true if the referenced bloom filter contains the key.. \n " +
"_FUNC_(string key, string bloomfilter) "
)
public class BloomContainsUDF extends UDF {
public Boolean evaluate( String key, String bloomFilter) throws HiveException {
Filter bloom = BloomFactory.GetBloomFilter(bloomFilter);
if( bloom != null) {
return bloom.membershipTest( new Key(key.getBytes()));
} else {
throw new HiveException("Unable to find bloom " + bloomFilter);
}
}
}