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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.

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/**
 * 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.base;

import net.sf.dynamicreports.report.ReportUtils;
import net.sf.dynamicreports.report.constant.Calculation;
import net.sf.dynamicreports.report.constant.Constants;
import net.sf.dynamicreports.report.constant.Evaluation;
import net.sf.dynamicreports.report.definition.DRIVariable;
import net.sf.dynamicreports.report.definition.expression.DRIExpression;

import org.apache.commons.lang3.Validate;

/**
 * @author Ricardo Mariaca ([email protected])
 */
public class DRVariable implements DRIVariable {
	private static final long serialVersionUID = Constants.SERIAL_VERSION_UID;

	private String name;
	private DRIExpression valueExpression;
	private DRIExpression initialValueExpression;
	private Calculation calculation;
	private Evaluation resetType;
	private DRGroup resetGroup;

	public DRVariable(DRIExpression valueExpression, Calculation calculation) {
		this(ReportUtils.generateUniqueName("variable"), valueExpression, calculation);
	}

	public DRVariable(String name, DRIExpression valueExpression, Calculation calculation) {
		Validate.notEmpty(name, "name must not be empty");
		Validate.notNull(valueExpression, "valueExpression must not be null");
		Validate.notNull(calculation, "calculation must not be null");
		this.name = name;
		this.valueExpression = valueExpression;
		this.calculation = calculation;
	}

	@Override
	public String getName() {
		return name;
	}

	@Override
	public DRIExpression getInitialValueExpression() {
		return initialValueExpression;
	}

	public void setInitialValueExpression(DRIExpression initialValueExpression) {
		this.initialValueExpression = initialValueExpression;
	}

	@Override
	public Calculation getCalculation() {
		return calculation;
	}

	@Override
	public Evaluation getResetType() {
		return resetType;
	}

	public void setResetType(Evaluation resetType) {
		this.resetType = resetType;
	}

	@Override
	public DRGroup getResetGroup() {
		return resetGroup;
	}

	public void setResetGroup(DRGroup resetGroup) {
		this.resetGroup = resetGroup;
	}

	@Override
	public DRIExpression getValueExpression() {
		return valueExpression;
	}

	@Override
	@SuppressWarnings("unchecked")
	public Class getValueClass() {
		return (Class) ReportUtils.getVariableValueClass(getCalculation(), valueExpression.getValueClass());
	}
}