com.linkedin.pinot.tools.data.generator.StringGenerator.java Source code

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Here is the source code for com.linkedin.pinot.tools.data.generator.StringGenerator.java

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/**
 * Copyright (C) 2014-2016 LinkedIn Corp. (pinot-core@linkedin.com)
 *
 * 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.
 */
package com.linkedin.pinot.tools.data.generator;

import java.util.ArrayList;
import java.util.HashSet;
import java.util.List;
import java.util.Random;
import java.util.Set;

import org.apache.commons.lang.RandomStringUtils;

/**
 * Sep 12, 2014
 */

public class StringGenerator implements Generator {

    private static final int lengthOfEachString = 10;

    private final int cardinality;
    private final Random rand;
    private List<String> vals;

    public StringGenerator(Integer cardinality) {
        this.cardinality = cardinality.intValue();
        rand = new Random(System.currentTimeMillis());
    }

    @Override
    public void init() {
        final Set<String> uniqueStrings = new HashSet<String>();
        for (int i = 0; i < cardinality; i++) {
            while (!uniqueStrings.add(RandomStringUtils.randomAlphabetic(lengthOfEachString))) {
                uniqueStrings.add(RandomStringUtils.randomAlphabetic(lengthOfEachString));
            }
        }
        vals = new ArrayList<String>(uniqueStrings);
    }

    @Override
    public Object next() {
        return vals.get(rand.nextInt(cardinality));
    }

    public static void main(String[] args) {
        final StringGenerator gen = new StringGenerator(10000);
        gen.init();
        for (int i = 0; i < 1000000; i++) {
            System.out.println(gen.next());
        }
    }
}