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 org.apache.hadoop.hive.ql.exec.Description;
import org.apache.hadoop.hive.ql.exec.UDF;
import org.apache.hadoop.util.bloom.Filter;

import java.io.IOException;


@Description(
        name = "bloom_and",
        value = " Returns the logical AND of two bloom filters; representing the intersection of values in both bloom1 AND bloom2  \n " +
                "_FUNC_(string bloom1, string bloom2) "
)
public class BloomAndUDF extends UDF {

    public String evaluate(String bloom1Str, String bloom2Str) throws IOException {
        Filter bloom1 = BloomFactory.GetBloomFilter(bloom1Str);
        Filter bloom2 = BloomFactory.GetBloomFilter(bloom2Str);

        bloom1.and(bloom2);

        return BloomFactory.WriteBloomToString(bloom1);
    }
}
