com.conversantmedia.mapreduce.output.StringBloomFilter.java Source code

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Here is the source code for com.conversantmedia.mapreduce.output.StringBloomFilter.java

Source

package com.conversantmedia.mapreduce.output;

/*
 * #%L
 * Mara Core framework
 * ~~
 * Copyright (C) 2015 Conversant
 * ~~
 * 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.
 * #L%
 */

import java.io.BufferedReader;
import java.io.IOException;
import java.util.Set;

import org.slf4j.LoggerFactory;

import com.google.common.hash.Funnel;
import com.google.common.hash.Funnels;

/**
 * COPIED from dcs-public to avoid adding dependency on library
 * for relatively minor class.
 *
 *  BloomFilter wrapper to make String operations easier
 */
public class StringBloomFilter extends AbstractBloomFilter {

    private static final org.slf4j.Logger log = LoggerFactory.getLogger(StringBloomFilter.class);

    public void init(final int expectedInsertions) {
        init(expectedInsertions, DEFAULT_FALSE_POSSITIVE);
    }

    public void init(final int expectedInsertions, final double falsePossitiveRate) {
        //All funnels created by Funnels factory are serializable
        Funnel<byte[]> byteFunnel = Funnels.byteArrayFunnel();
        init(expectedInsertions, falsePossitiveRate, byteFunnel);
    }

    @SuppressWarnings("unchecked")
    public boolean mightContain(final String check) {
        return filter.mightContain(check.getBytes());
    }

    @SuppressWarnings("unchecked")
    public boolean mightContain(final byte[] check) {
        return filter.mightContain(check);
    }

    @SuppressWarnings("unchecked")
    public void addToFilter(final String s) {
        filter.put(s.getBytes());
    }

    public void addToFilter(final String[] s) {
        for (String t : s) {
            addToFilter(t);
        }
    }

    public void addToFilter(final Set<String> s) {
        for (String t : s) {
            addToFilter(t);
        }
    }

    public void addToFilter(final BufferedReader input) {
        try {
            while (input.ready()) {
                addToFilter(input.readLine());
            }
        } catch (IOException ex) {
            log.error("IOException reading from BufferedReader: ", ex);
        }
    }

}