/*
* 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.drill.exec.store.mock;
import java.util.Random;
import org.apache.drill.exec.vector.ValueVector;
import org.apache.drill.exec.vector.VarCharVector;
/**
* Generates a mock string field of the given length. Fields are composed
* of upper case letters uniformly distributed from A to Z, and repeated
* or the length of the field. Exampled for a 4-character field:
* DDDD, MMMM, AAAA, RRRR, ...
*/
public class StringGen implements FieldGen {
private final Random rand = new Random();
private int length;
@Override
public void setup(ColumnDef colDef) {
length = colDef.width;
}
private String value() {
String c = Character.toString((char) (rand.nextInt(26) + 'A'));
StringBuilder buf = new StringBuilder();
for (int i = 0; i < length; i++) {
buf.append(c);
}
return buf.toString();
}
@Override
public void setValue(ValueVector v, int index) {
VarCharVector vector = (VarCharVector) v;
vector.getMutator().setSafe(index, value().getBytes());
}
}