/*
* 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.Map;
import java.util.Random;
import org.apache.drill.exec.vector.ValueVector;
import org.apache.drill.exec.vector.VarCharVector;
public class VaryingStringGen implements FieldGen {
private Random rand = new Random();
private int length;
private int span;
private int deltaPerSpan;
private int valueCount;
@Override
public void setup(ColumnDef colDef) {
length = colDef.width;
Map<String,Object> props = colDef.mockCol.properties;
span = 1000;
deltaPerSpan = 100;
if (props != null) {
Integer value = (Integer) props.get("span");
if (value != null) {
span = Math.max(1, value);
}
value = (Integer) props.get("delta");
if (value != null) {
deltaPerSpan = value;
}
}
}
public String value() {
if (valueCount++ >= span) {
valueCount = 0;
length = Math.max(0, length + deltaPerSpan);
}
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());
}
}