org.apache.druid.query.filter.BloomKFilterHolder.java Source code

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Here is the source code for org.apache.druid.query.filter.BloomKFilterHolder.java

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/*
 * 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.druid.query.filter;

import com.google.common.hash.HashCode;
import com.google.common.hash.Hashing;
import org.apache.druid.guice.BloomFilterSerializersModule;

import java.io.IOException;
import java.util.Objects;

public class BloomKFilterHolder {
    private final BloomKFilter filter;
    private final HashCode hash;

    public BloomKFilterHolder(BloomKFilter filter, HashCode hash) {
        this.filter = filter;
        this.hash = hash;
    }

    BloomKFilter getFilter() {
        return filter;
    }

    HashCode getFilterHash() {
        return hash;
    }

    public static BloomKFilterHolder fromBloomKFilter(BloomKFilter filter) throws IOException {
        byte[] bytes = BloomFilterSerializersModule.bloomKFilterToBytes(filter);

        return new BloomKFilterHolder(filter, Hashing.sha512().hashBytes(bytes));
    }

    public static BloomKFilterHolder fromBytes(byte[] bytes) throws IOException {
        return new BloomKFilterHolder(BloomFilterSerializersModule.bloomKFilterFromBytes(bytes),
                Hashing.sha512().hashBytes(bytes));
    }

    @Override
    public boolean equals(Object o) {
        if (this == o) {
            return true;
        }
        if (o == null || getClass() != o.getClass()) {
            return false;
        }

        BloomKFilterHolder that = (BloomKFilterHolder) o;
        return Objects.equals(this.hash, that.hash);
    }

    @Override
    public int hashCode() {
        return Objects.hash(filter, hash);
    }
}