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Free Java Reporting Library
/*
* JasperReports - Free Java Reporting Library.
* Copyright (C) 2001 - 2019 TIBCO Software Inc. All rights reserved.
* http://www.jaspersoft.com
*
* Unless you have purchased a commercial license agreement from Jaspersoft,
* the following license terms apply:
*
* This program is part of JasperReports.
*
* JasperReports is free software: you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* JasperReports is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with JasperReports. If not, see .
*/
package net.sf.jasperreports.data.random;
import java.math.BigDecimal;
import java.math.BigInteger;
import java.sql.Timestamp;
import java.util.Date;
import java.util.Random;
import net.sf.jasperreports.engine.JRException;
import net.sf.jasperreports.engine.JRField;
import net.sf.jasperreports.engine.JRRewindableDataSource;
/**
* @author Lucian Chirita ([email protected])
*
*/
public class RandomDataSource implements JRRewindableDataSource {
private final int count;
private final Random random;
private int index;
public RandomDataSource(int count) {
this.random = new Random();
this.count = count;
this.index = 0;
}
@Override
public boolean next() throws JRException {
if (index >= count) {
return false;
}
++index;
return true;
}
@Override
public Object getFieldValue(JRField field) throws JRException {
Object value;
Class valueClass = field.getValueClass();
if (String.class.equals(valueClass)) {
String name = field.getName();
if (name.length() > 1000) {
name = name.substring(0, 1000);
}
StringBuilder valueStr = new StringBuilder(name);
int cnt = 2 + random.nextInt(3);
for (int i = 0; i < cnt; ++i)
valueStr.append(" ").append(random.nextInt(100));
value = valueStr.toString();
} else if (Float.class.equals(valueClass)) {
value = 200000 * random.nextFloat();
} else if (Double.class.equals(valueClass)) {
value = 200000 * random.nextDouble();
} else if (Long.class.equals(valueClass)) {
value = random.nextLong();
} else if (Integer.class.equals(valueClass)) {
value = random.nextInt(20);
} else if (BigInteger.class.equals(valueClass)) {
value = BigInteger.valueOf(random.nextLong());
} else if (BigDecimal.class.equals(valueClass)) {
value = BigDecimal.valueOf(random.nextInt(10000) / 100d);
} else if (Date.class.equals(valueClass)) {
value = new Date(System.currentTimeMillis() - random.nextInt(20 * 24 * 60 * 60 * 1000));
} else if (java.sql.Date.class.equals(valueClass)) {
value = new java.sql.Date(System.currentTimeMillis() - random.nextInt(20 * 24 * 60 * 60 * 1000));
} else if (Timestamp.class.equals(valueClass)) {
value = new Timestamp(System.currentTimeMillis() - random.nextInt(20 * 24 * 60 * 60 * 1000));
} else if (Boolean.class.equals(valueClass)) {
value = random.nextInt(2) == 0;
} else {
value = null;
}
return value;
}
@Override
public void moveFirst() throws JRException {
index = 0;
}
}