| /* |
| * 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.cassandra.db.marshal; |
| |
| import java.nio.ByteBuffer; |
| import java.util.ArrayList; |
| import java.util.List; |
| import java.util.Random; |
| import java.util.function.Function; |
| |
| import com.google.common.collect.ImmutableList; |
| |
| public class ValueGenerator |
| { |
| public static final ValueGenerator INTEGER = new ValueGenerator(Int32Type.instance, Random::nextInt); |
| public static final ValueGenerator BLOB = new ValueGenerator(BytesType.instance, ValueGenerator::randomBytes); |
| public static final ValueGenerator TEXT = new ValueGenerator(UTF8Type.instance, ValueGenerator::randomString); |
| public static final List<ValueGenerator> GENERATORS = ImmutableList.of(INTEGER, BLOB); |
| |
| private final AbstractType type; |
| private final Function<Random, Object> generator; |
| |
| public static ByteBuffer randomBytes(Random random) |
| { |
| byte[] bytes = new byte[random.nextInt(100)]; |
| random.nextBytes(bytes); |
| return ByteBuffer.wrap(bytes); |
| } |
| |
| private static final char[] CHARS = "abcdefghijklmnopqrstuvwxyz0123456789".toCharArray(); |
| |
| public static String randomString(Random random) |
| { |
| char[] chars = new char[random.nextInt(100)]; |
| for (int i=0; i<chars.length; i++) |
| chars[i] = CHARS[random.nextInt(CHARS.length)]; |
| return new String(chars); |
| } |
| |
| private ValueGenerator(AbstractType<?> type, Function<Random, Object> generator) |
| { |
| this.type = type; |
| this.generator = generator; |
| } |
| |
| public AbstractType<?> getType() |
| { |
| return type; |
| } |
| |
| public Object nextValue(Random random) |
| { |
| return generator.apply(random); |
| } |
| |
| public static ValueGenerator randomGenerator(Random random) |
| { |
| return GENERATORS.get(random.nextInt(GENERATORS.size())); |
| } |
| |
| public static List<AbstractType<?>> toTypes(ValueGenerator[] generators) |
| { |
| List<AbstractType<?>> types = new ArrayList<>(generators.length); |
| for (ValueGenerator generator : generators) |
| types.add(generator.getType()); |
| return types; |
| } |
| |
| public static ValueGenerator[] randomGenerators(Random random, int maxSize) |
| { |
| int size = random.nextInt(maxSize); |
| ValueGenerator[] generators = new ValueGenerator[size]; |
| for (int i=0; i<size; i++) |
| { |
| generators[i] = randomGenerator(random); |
| } |
| return generators; |
| } |
| } |