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.io.IOException;
import org.apache.hadoop.hive.ql.exec.Description;
import org.apache.hadoop.hive.ql.exec.UDF;
import org.apache.hadoop.util.bloom.Filter;
@Description(
name = "bloom_not",
value = " Returns the logical NOT of a bloom filters; representing the set of values NOT in bloom1 \n " +
"_FUNC_(string bloom) "
)
public class BloomNotUDF extends UDF {
public String evaluate( String bloomStr ) throws IOException {
Filter bloom = BloomFactory.GetBloomFilter( bloomStr);
/// Perform a logical not
bloom.not();
return BloomFactory.WriteBloomToString( bloom);
}
}