/*
* 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.
*
* Copyright 2013 Near Infinity Corporation.
*/
package com.nearinfinity.honeycomb.mysql.generators;
import com.google.common.collect.Lists;
import com.nearinfinity.honeycomb.mysql.schema.IndexSchema;
import net.java.quickcheck.Generator;
import net.java.quickcheck.generator.CombinedGenerators;
import net.java.quickcheck.generator.PrimitiveGenerators;
import java.util.Collections;
import java.util.List;
import java.util.Random;
public class IndexSchemaGenerator implements Generator<IndexSchema> {
private static final Generator<Integer> lengthGen =
PrimitiveGenerators.integers(1, 4);
private static final Random RAND = new Random();
private final List<String> columnNames;
/**
* Maximum number of characters in an identifier
* @see <a href="https://dev.mysql.com/doc/refman/5.5/en/identifiers.html">https://dev.mysql.com/doc/refman/5.5/en/identifiers.html</a>
*/
public static final int MYSQL_MAX_NAME_LENGTH = 64;
public static final Generator<String> MYSQL_NAME_GEN =
CombinedGenerators.uniqueValues(PrimitiveGenerators.strings(1, MYSQL_MAX_NAME_LENGTH));
public IndexSchemaGenerator(List<String> columnNames) {
this.columnNames = Lists.newArrayList(columnNames); // Must be mutable
}
@Override
public IndexSchema next() {
Collections.shuffle(columnNames);
List<String> columns = columnNames.subList(0, Math.min(lengthGen.next(), columnNames.size()));
return new IndexSchema(MYSQL_NAME_GEN.next(), columns, RAND.nextBoolean());
}
}