/*
*
* 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
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*/
package org.apache.cassandra.stress.generate.values;
import org.apache.cassandra.db.marshal.UTF8Type;
import org.apache.cassandra.stress.generate.FasterRandom;
public class Strings extends Generator<String>
{
private final char[] chars;
private final FasterRandom rnd = new FasterRandom();
public Strings(String name, GeneratorConfig config)
{
super(UTF8Type.instance, config, name, String.class);
chars = new char[(int) sizeDistribution.maxValue()];
}
@Override
public String generate()
{
long seed = identityDistribution.next();
sizeDistribution.setSeed(seed);
rnd.setSeed(~seed);
int size = (int) sizeDistribution.next();
for (int i = 0; i < size; )
for (long v = rnd.nextLong(),
n = Math.min(size - i, Long.SIZE/Byte.SIZE);
n-- > 0; v >>= Byte.SIZE)
chars[i++] = (char) (((v & 127) + 32) & 127);
return new String(chars, 0, size);
}
}