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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 - 2018 Ricardo Mariaca and the Dynamic Reports Contributors
 * 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.crosstab;

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.CrosstabPercentageType;
import net.sf.dynamicreports.report.definition.crosstab.DRICrosstabVariable;
import net.sf.dynamicreports.report.definition.expression.DRIExpression;
import org.apache.commons.lang3.Validate;

/**
 * DRCrosstabVariable class.
 *
 * @author Ricardo Mariaca ([email protected])
 * @version $Id: $Id
 */
public class DRCrosstabVariable implements DRICrosstabVariable {
    private static final long serialVersionUID = Constants.SERIAL_VERSION_UID;

    private String name;
    private DRIExpression valueExpression;
    private Calculation calculation;
    private CrosstabPercentageType percentageType;

    /**
     * Constructor for DRCrosstabVariable.
     *
     * @param valueExpression a {@link net.sf.dynamicreports.report.definition.expression.DRIExpression} object.
     * @param calculation     a {@link net.sf.dynamicreports.report.constant.Calculation} object.
     */
    public DRCrosstabVariable(DRIExpression valueExpression, Calculation calculation) {
        Validate.notNull(valueExpression, "valueExpression must not be null");
        Validate.notNull(calculation, "calculation must not be null");
        this.valueExpression = valueExpression;
        this.calculation = calculation;
        this.name = ReportUtils.generateUniqueName("crosstabMeasure");
    }

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

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

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

    /** {@inheritDoc} */
    @Override
    public CrosstabPercentageType getPercentageType() {
        return percentageType;
    }

    /**
     * Setter for the field percentageType.
     *
     * @param percentageType a {@link net.sf.dynamicreports.report.constant.CrosstabPercentageType} object.
     */
    public void setPercentageType(CrosstabPercentageType percentageType) {
        this.percentageType = percentageType;
    }

    /** {@inheritDoc} */
    @Override
    @SuppressWarnings("unchecked")
    public Class getValueClass() {
        if (percentageType != null && percentageType.equals(CrosstabPercentageType.GRAND_TOTAL) && !calculation.equals(Calculation.COUNT) && !calculation.equals(Calculation.DISTINCT_COUNT)) {
            return (Class) Double.class;
        }
        return (Class) ReportUtils.getVariableValueClass(getCalculation(), valueExpression.getValueClass());
    }
}