net.sf.dynamicreports.report.builder.expression.CalculationExpression Maven / Gradle / Ivy
Go to download
Show more of this group Show more artifacts with this name
Show all versions of dynamicreports-core Show documentation
Show all versions of dynamicreports-core Show documentation
DynamicReports is an open source Java reporting library based on JasperReports. It allows to create dynamic report designs and it doesn't need a visual report designer.
You can very quickly create reports and produce documents that can be displayed, printed or exported into many popular formats such as PDF, Excel, Word and others.
/**
* DynamicReports - Free Java reporting library for creating reports dynamically
*
* Copyright (C) 2010 - 2016 Ricardo Mariaca
* http://www.dynamicreports.org
*
* This file is part of DynamicReports.
*
* DynamicReports 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.
*
* DynamicReports 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 DynamicReports. If not, see .
*/
package net.sf.dynamicreports.report.builder.expression;
import java.math.BigDecimal;
import java.util.List;
import org.apache.commons.lang3.Validate;
import net.sf.dynamicreports.report.constant.Constants;
import net.sf.dynamicreports.report.definition.ReportParameters;
import net.sf.dynamicreports.report.definition.expression.DRIExpression;
/**
* @author Ricardo Mariaca ([email protected])
*/
abstract class CalculationExpression extends AbstractComplexExpression {
private static final long serialVersionUID = Constants.SERIAL_VERSION_UID;
@SafeVarargs
protected CalculationExpression(DRIExpression ...expressions) {
Validate.notNull(expressions, "expressions must not be null");
Validate.noNullElements(expressions, "expressions must not contains null expression");
for (DRIExpression expression : expressions) {
addExpression(expression);
}
}
@Override
public BigDecimal evaluate(List values, ReportParameters reportParameters) {
BigDecimal result = null;
for (Object value : values) {
BigDecimal bigDecimalValue;
if (value instanceof BigDecimal) {
bigDecimalValue = (BigDecimal) value;
}
else {
bigDecimalValue = new BigDecimal(((Number) value).doubleValue());
}
if (result == null) {
result = bigDecimalValue;
}
else {
result = calculate(result, bigDecimalValue);
}
}
return result;
}
protected abstract BigDecimal calculate(BigDecimal value1, BigDecimal value2);
}