Collections 不同键的和值（不分组） 背景

考虑以下几点：

方法2 创建

MappedIncrementerFactory

和

MappedIncrementer

，类似于

JRDistinctCountIncrementerFactory

和

JRDistinctCountIncrementer

方法3 预先计算总计，并使用数据对象模型将其传入。例如：

public class DataSetItem {
    public String getName() { ... }
    public String getMode() { ... }
    public Integer getTally() { ... }
}

public class DataSet {
    public List<DataSetItem> getDataSetItemList() { ... }
    public Map<String, Integer> getDataSetTotals() { ... }
}

public class DataSetFactory {
    /** Returns a single instance that has the list of items and totals. */
    public List<DataSet> createDataSetItemCollection() { ... }
}

公共类数据源项{
公共字符串getName（）{…}
公共字符串getMode（）{…}
公共整数gettaly（）{…}
}
公共类数据集{
公共列表getDataSetItemList（）{…}
公共映射getDataSetTotals（）{…}
}
公共类数据集工厂{
/**返回包含项目和总计列表的单个实例*/
公共列表createDataSetItemCollection（）{…}
}

方法4 使用Scriptlet并返回值的

JRDataSource

问题: 如何创建包含键/值对的集合类型变量（映射），其中每个值都是与键名称匹配的报告行的总和？

这将是方法4：使用 涂鸦课 scriplet将求和并存储数据，以便稍后（在所有细节之后）返回数据源。注意：

Nullpointer

或数据源的其他问题不被考虑

public class Scriplet extends JRDefaultScriptlet {

    private Map<String, TxSubTotal> subTotals; //Use map for quick access
    private int lastRecNr = 0; //Jasper has a bad habit of calling twice

    public Scriplet(){
        super();
        subTotals = new HashMap<>();
    }

    @Override
    public void afterDetailEval() throws JRScriptletException {
        int recNr = ((Integer)this.getVariableValue("REPORT_COUNT")); 
        if (lastRecNr==recNr){ //Check we only count once per record
            return;
        }
        lastRecNr=recNr;
        String key = (String)this.getFieldValue("Mode");
        int value = ((Integer)this.getFieldValue("Tally")).intValue();

        TxSubTotal tst = subTotals.get(key);
        if (tst == null){
            tst = new TxSubTotal(key);
            subTotals.put(key, tst);
        }
        tst.addTotal(value);
        super.afterDetailEval();
    }

    //This is our datasource
    public JRRewindableDataSource getSubTotalDataSource(){
        List<TxSubTotal> txList = new ArrayList<>();
        //add some sorting to show the power of scriplet
        txList.addAll(subTotals.values());
        Collections.sort(txList);
        return new JRBeanCollectionDataSource(txList);
    }
}

jrxml 将scriptlet设置为报告

scriptletClass="Scriplet" 

这个jrxml使用

jr:table

组件来显示数据，但也可以使用子报表。关键是在摘要栏中使用它，或者在表/子报表组件上使用

evaluationTime=“report”

。数据源表达式将是

<dataSourceExpression><![CDATA[$P{REPORT_SCRIPTLET}.getSubTotalDataSource()]]></dataSourceExpression>

完整jrxml

<?xml version="1.0" encoding="UTF-8"?>
<jasperReport xmlns="http://jasperreports.sourceforge.net/jasperreports" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://jasperreports.sourceforge.net/jasperreports http://jasperreports.sourceforge.net/xsd/jasperreport.xsd" name="Jarvis" pageWidth="595" pageHeight="842" columnWidth="555" leftMargin="20" rightMargin="20" topMargin="20" bottomMargin="20" scriptletClass="Scriplet" uuid="d626fd77-14da-4974-8b4f-6368e913ac91">
    <style name="table">
        <box>
            <pen lineWidth="0.25" lineColor="#000000"/>
        </box>
    </style>
    <style name="table_TD" mode="Opaque" backcolor="#FFFFFF">
        <box>
            <pen lineWidth="0.5" lineColor="#000000"/>
        </box>
    </style>
    <subDataset name="subTotals" uuid="486941af-2c8f-4ebb-8b8a-7a1dfe2ac0ad">
        <field name="mode" class="java.lang.String"/>
        <field name="total" class="java.lang.Integer"/>
    </subDataset>
    <queryString>
        <![CDATA[]]>
    </queryString>
    <field name="Name" class="java.lang.String"/>
    <field name="Mode" class="java.lang.String"/>
    <field name="Tally" class="java.lang.Integer"/>
    <background>
        <band splitType="Stretch"/>
    </background>
    <columnHeader>
        <band height="20" splitType="Stretch">
            <staticText>
                <reportElement mode="Opaque" x="0" y="0" width="100" height="20" forecolor="#000000" backcolor="#CCCCCC" uuid="30cd16d8-6765-42f9-b5f9-22bc0625adca"/>
                <box leftPadding="2" rightPadding="2">
                    <pen lineWidth="0.25"/>
                    <topPen lineWidth="0.25"/>
                    <leftPen lineWidth="0.25"/>
                    <bottomPen lineWidth="0.25"/>
                    <rightPen lineWidth="0.25"/>
                </box>
                <textElement verticalAlignment="Middle"/>
                <text><![CDATA[Name]]></text>
            </staticText>
            <staticText>
                <reportElement mode="Opaque" x="100" y="0" width="100" height="20" forecolor="#000000" backcolor="#CCCCCC" uuid="88418f9a-5d2b-487e-b04d-e11bc57726d7"/>
                <box leftPadding="2" rightPadding="2">
                    <pen lineWidth="0.25"/>
                    <topPen lineWidth="0.25"/>
                    <leftPen lineWidth="0.25"/>
                    <bottomPen lineWidth="0.25"/>
                    <rightPen lineWidth="0.25"/>
                </box>
                <textElement verticalAlignment="Middle"/>
                <text><![CDATA[Mode]]></text>
            </staticText>
            <staticText>
                <reportElement mode="Opaque" x="200" y="0" width="100" height="20" forecolor="#000000" backcolor="#CCCCCC" uuid="dd2495bb-3a3d-4b0e-b986-055bf55cf19b"/>
                <box leftPadding="2" rightPadding="2">
                    <pen lineWidth="0.25"/>
                    <topPen lineWidth="0.25"/>
                    <leftPen lineWidth="0.25"/>
                    <bottomPen lineWidth="0.25"/>
                    <rightPen lineWidth="0.25"/>
                </box>
                <textElement textAlignment="Right" verticalAlignment="Middle"/>
                <text><![CDATA[Tally]]></text>
            </staticText>
        </band>
    </columnHeader>
    <detail>
        <band height="20" splitType="Stretch">
            <textField>
                <reportElement x="0" y="0" width="100" height="20" uuid="53931171-df80-43e7-9b9d-5d77ce4223dc"/>
                <box leftPadding="2" rightPadding="2">
                    <pen lineWidth="0.25"/>
                    <topPen lineWidth="0.25"/>
                    <leftPen lineWidth="0.25"/>
                    <bottomPen lineWidth="0.25"/>
                    <rightPen lineWidth="0.25"/>
                </box>
                <textElement verticalAlignment="Middle"/>
                <textFieldExpression><![CDATA[$F{Name}]]></textFieldExpression>
            </textField>
            <textField>
                <reportElement x="100" y="0" width="100" height="20" uuid="f809c675-c68b-4ad0-b662-23ba6e9dd70c"/>
                <box leftPadding="2" rightPadding="2">
                    <pen lineWidth="0.25"/>
                    <topPen lineWidth="0.25"/>
                    <leftPen lineWidth="0.25"/>
                    <bottomPen lineWidth="0.25"/>
                    <rightPen lineWidth="0.25"/>
                </box>
                <textElement verticalAlignment="Middle"/>
                <textFieldExpression><![CDATA[$F{Mode}]]></textFieldExpression>
            </textField>
            <textField>
                <reportElement x="200" y="0" width="100" height="20" uuid="0852ff01-aa61-4a7f-9c11-a481b78b56fd"/>
                <box leftPadding="2" rightPadding="2">
                    <pen lineWidth="0.25"/>
                    <topPen lineWidth="0.25"/>
                    <leftPen lineWidth="0.25"/>
                    <bottomPen lineWidth="0.25"/>
                    <rightPen lineWidth="0.25"/>
                </box>
                <textElement textAlignment="Right" verticalAlignment="Middle"/>
                <textFieldExpression><![CDATA[$F{Tally}]]></textFieldExpression>
            </textField>
        </band>
    </detail>
    <summary>
        <band height="75" splitType="Stretch">
            <componentElement>
                <reportElement key="table" style="table" x="120" y="25" width="180" height="50" uuid="5158e7c3-d87d-4877-a3ab-d6a6f9a57c5a"/>
                <jr:table xmlns:jr="http://jasperreports.sourceforge.net/jasperreports/components" xsi:schemaLocation="http://jasperreports.sourceforge.net/jasperreports/components http://jasperreports.sourceforge.net/xsd/components.xsd">
                    <datasetRun subDataset="subTotals" uuid="9b73e50e-4bdf-41c2-8d40-4d215fe6b6e9">
                        <dataSourceExpression><![CDATA[$P{REPORT_SCRIPTLET}.getSubTotalDataSource()]]></dataSourceExpression>
                    </datasetRun>
                    <jr:column width="90" uuid="cbb85338-16b3-487d-8045-6dd94c661fc0">
                        <jr:detailCell style="table_TD" height="30" rowSpan="1">
                            <textField>
                                <reportElement x="0" y="0" width="90" height="30" uuid="5c07b5af-9e28-4a14-a70a-3789bfc88087"/>
                                <box leftPadding="2" rightPadding="2"/>
                                <textElement verticalAlignment="Middle"/>
                                <textFieldExpression><![CDATA[$F{mode}]]></textFieldExpression>
                            </textField>
                        </jr:detailCell>
                    </jr:column>
                    <jr:column width="90" uuid="d69567f0-ec7c-4b83-bc22-5aae1cab7879">
                        <jr:detailCell style="table_TD" height="30" rowSpan="1">
                            <textField>
                                <reportElement x="0" y="0" width="90" height="30" uuid="2a3a2055-f9c0-46e3-b816-b6ee1c989f9c"/>
                                <box leftPadding="2" rightPadding="2"/>
                                <textElement textAlignment="Right" verticalAlignment="Middle"/>
                                <textFieldExpression><![CDATA[$F{total}]]></textFieldExpression>
                            </textField>
                        </jr:detailCell>
                    </jr:column>
                </jr:table>
            </componentElement>
            <staticText>
                <reportElement x="120" y="5" width="180" height="20" uuid="9ef22e85-34ce-47c9-afad-2813a8a0b863"/>
                <textElement verticalAlignment="Middle"/>
                <text><![CDATA[Tx SubTotals]]></text>
            </staticText>
        </band>
    </summary>
</jasperReport>

从包含相关数据的cvs文件生成pdf导出的主要方法

publicstaticvoidmain（字符串[]args）抛出JRException、FileNotFoundException{
JasperReport report=jaspecompilemanager.compileReport（“myReport.jrxml”）；
JRCsvDataSource datasource=新的JRCsvDataSource（新文件（“data/datasource.csv”）；
datasource.setFieldDelimiter（“；”）；
datasource.setUseFirstRowaHeader（true）；
setLocale（Locale.US）；
JasperPrint JasperPrint=JasperFillManager.fillReport（报告，新HashMap（），数据源）；
JRPdfExporter exporter=新的JRPdfExporter（）；
exporter.setExporterInput（新的SimpleExporterInput（jasperPrint））；
exporter.setExporterOutput（新的SimpleOutputStreamExporterOutput（“pdf/example.pdf”）；
SimplePDExporterConfiguration配置=新的SimplePDExporterConfiguration（）；
exporter.setConfiguration（配置）；
出口商。出口报告（）；
}

结果

---

一般解决方案如下。键和值列元组的名称在子报表中设置为参数。主报告包含scriptlet、子报告和总计摘要页面。这在有许多几乎相同的子报表的情况下非常有用，但只有一些子报表需要基于列元组的总计

每个具有总元组的子报表必须分别为关键参数和值参数定义一个值：

SCRIPTLET_key_COLUMN_NAME

和

SCRIPTLET_value_COLUMN_NAME

。如果未在子报表中设置键参数，则

isSubreport（）

将返回false，并且不会执行求和

程序段 主报表运行以下scriptlet，通过将scriptlet类设置为

com.company.jasper.TupleSumScriptlet

来配置它

package com.company.jasper;

import java.util.*;
import net.sf.jasperreports.engine.*;
import net.sf.jasperreports.engine.data.JRBeanCollectionDataSource;

public class TupleSumScriplet extends JRDefaultScriptlet {
    private final static String REPORT_KEY_COLUMN_NAME
            = "SCRIPTLET_KEY_COLUMN_NAME";
    private final static String REPORT_VALUE_COLUMN_NAME
            = "SCRIPTLET_VALUE_COLUMN_NAME";

    private final Map<String, Integer> sums = new HashMap<>();

    public TupleSumScriplet() { }

    @Override
    public void afterDetailEval() throws JRScriptletException {
        if (isSubreport()) {
            final String keyColumnName = getKeyColumnName();
            final String key = (String) getFieldValue(keyColumnName);

            final String valueColumnName = getValueColumnName();
            final int value = (Integer) getFieldValue(valueColumnName);

            final Map<String, Integer> totals = getSums();
            final int sum = totals.containsKey(key) ? totals.get(key) : 0;

            totals.put(key, sum + value);
        }
    }

    public JRDataSource getDataSource() {
        return new JRBeanCollectionDataSource(sort(getSums()));
    }

    public Map<String, Integer> getSums() {
        return this.sums;
    }

    private String getKeyColumnName() throws JRScriptletException {
        return (String) getParameterValue(REPORT_KEY_COLUMN_NAME);
    }

    protected String getValueColumnName() throws JRScriptletException {
        return (String) getParameterValue(REPORT_VALUE_COLUMN_NAME);
    }

    private boolean isSubreport() {
        boolean result;

        try {
            result = true;
            final String unused = getKeyColumnName();

        } catch (JRScriptletException e) {
            result = false;
        }

        return result;
    }

    public static
            <K extends Comparable<? super K>, V> Collection<Map.Entry<K, V>>
            sort(Map<K, V> map) {
        final List<Map.Entry<K, V>> list = new LinkedList<>(map.entrySet());

        Collections.sort(list, new Comparator<Map.Entry<K, V>>() {
            @Override
            public int compare(Map.Entry<K, V> o1, Map.Entry<K, V> o2) {
                return (o1.getKey()).compareTo(o2.getKey());
            }
        });

        return list;
    }
}

总计子报告的相关JRXML如下所示：

scriptletClass="Scriplet" 

<dataSourceExpression><![CDATA[$P{REPORT_SCRIPTLET}.getSubTotalDataSource()]]></dataSourceExpression>

<?xml version="1.0" encoding="UTF-8"?>
<jasperReport xmlns="http://jasperreports.sourceforge.net/jasperreports" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://jasperreports.sourceforge.net/jasperreports http://jasperreports.sourceforge.net/xsd/jasperreport.xsd" name="Jarvis" pageWidth="595" pageHeight="842" columnWidth="555" leftMargin="20" rightMargin="20" topMargin="20" bottomMargin="20" scriptletClass="Scriplet" uuid="d626fd77-14da-4974-8b4f-6368e913ac91">
    <style name="table">
        <box>
            <pen lineWidth="0.25" lineColor="#000000"/>
        </box>
    </style>
    <style name="table_TD" mode="Opaque" backcolor="#FFFFFF">
        <box>
            <pen lineWidth="0.5" lineColor="#000000"/>
        </box>
    </style>
    <subDataset name="subTotals" uuid="486941af-2c8f-4ebb-8b8a-7a1dfe2ac0ad">
        <field name="mode" class="java.lang.String"/>
        <field name="total" class="java.lang.Integer"/>
    </subDataset>
    <queryString>
        <![CDATA[]]>
    </queryString>
    <field name="Name" class="java.lang.String"/>
    <field name="Mode" class="java.lang.String"/>
    <field name="Tally" class="java.lang.Integer"/>
    <background>
        <band splitType="Stretch"/>
    </background>
    <columnHeader>
        <band height="20" splitType="Stretch">
            <staticText>
                <reportElement mode="Opaque" x="0" y="0" width="100" height="20" forecolor="#000000" backcolor="#CCCCCC" uuid="30cd16d8-6765-42f9-b5f9-22bc0625adca"/>
                <box leftPadding="2" rightPadding="2">
                    <pen lineWidth="0.25"/>
                    <topPen lineWidth="0.25"/>
                    <leftPen lineWidth="0.25"/>
                    <bottomPen lineWidth="0.25"/>
                    <rightPen lineWidth="0.25"/>
                </box>
                <textElement verticalAlignment="Middle"/>
                <text><![CDATA[Name]]></text>
            </staticText>
            <staticText>
                <reportElement mode="Opaque" x="100" y="0" width="100" height="20" forecolor="#000000" backcolor="#CCCCCC" uuid="88418f9a-5d2b-487e-b04d-e11bc57726d7"/>
                <box leftPadding="2" rightPadding="2">
                    <pen lineWidth="0.25"/>
                    <topPen lineWidth="0.25"/>
                    <leftPen lineWidth="0.25"/>
                    <bottomPen lineWidth="0.25"/>
                    <rightPen lineWidth="0.25"/>
                </box>
                <textElement verticalAlignment="Middle"/>
                <text><![CDATA[Mode]]></text>
            </staticText>
            <staticText>
                <reportElement mode="Opaque" x="200" y="0" width="100" height="20" forecolor="#000000" backcolor="#CCCCCC" uuid="dd2495bb-3a3d-4b0e-b986-055bf55cf19b"/>
                <box leftPadding="2" rightPadding="2">
                    <pen lineWidth="0.25"/>
                    <topPen lineWidth="0.25"/>
                    <leftPen lineWidth="0.25"/>
                    <bottomPen lineWidth="0.25"/>
                    <rightPen lineWidth="0.25"/>
                </box>
                <textElement textAlignment="Right" verticalAlignment="Middle"/>
                <text><![CDATA[Tally]]></text>
            </staticText>
        </band>
    </columnHeader>
    <detail>
        <band height="20" splitType="Stretch">
            <textField>
                <reportElement x="0" y="0" width="100" height="20" uuid="53931171-df80-43e7-9b9d-5d77ce4223dc"/>
                <box leftPadding="2" rightPadding="2">
                    <pen lineWidth="0.25"/>
                    <topPen lineWidth="0.25"/>
                    <leftPen lineWidth="0.25"/>
                    <bottomPen lineWidth="0.25"/>
                    <rightPen lineWidth="0.25"/>
                </box>
                <textElement verticalAlignment="Middle"/>
                <textFieldExpression><![CDATA[$F{Name}]]></textFieldExpression>
            </textField>
            <textField>
                <reportElement x="100" y="0" width="100" height="20" uuid="f809c675-c68b-4ad0-b662-23ba6e9dd70c"/>
                <box leftPadding="2" rightPadding="2">
                    <pen lineWidth="0.25"/>
                    <topPen lineWidth="0.25"/>
                    <leftPen lineWidth="0.25"/>
                    <bottomPen lineWidth="0.25"/>
                    <rightPen lineWidth="0.25"/>
                </box>
                <textElement verticalAlignment="Middle"/>
                <textFieldExpression><![CDATA[$F{Mode}]]></textFieldExpression>
            </textField>
            <textField>
                <reportElement x="200" y="0" width="100" height="20" uuid="0852ff01-aa61-4a7f-9c11-a481b78b56fd"/>
                <box leftPadding="2" rightPadding="2">
                    <pen lineWidth="0.25"/>
                    <topPen lineWidth="0.25"/>
                    <leftPen lineWidth="0.25"/>
                    <bottomPen lineWidth="0.25"/>
                    <rightPen lineWidth="0.25"/>
                </box>
                <textElement textAlignment="Right" verticalAlignment="Middle"/>
                <textFieldExpression><![CDATA[$F{Tally}]]></textFieldExpression>
            </textField>
        </band>
    </detail>
    <summary>
        <band height="75" splitType="Stretch">
            <componentElement>
                <reportElement key="table" style="table" x="120" y="25" width="180" height="50" uuid="5158e7c3-d87d-4877-a3ab-d6a6f9a57c5a"/>
                <jr:table xmlns:jr="http://jasperreports.sourceforge.net/jasperreports/components" xsi:schemaLocation="http://jasperreports.sourceforge.net/jasperreports/components http://jasperreports.sourceforge.net/xsd/components.xsd">
                    <datasetRun subDataset="subTotals" uuid="9b73e50e-4bdf-41c2-8d40-4d215fe6b6e9">
                        <dataSourceExpression><![CDATA[$P{REPORT_SCRIPTLET}.getSubTotalDataSource()]]></dataSourceExpression>
                    </datasetRun>
                    <jr:column width="90" uuid="cbb85338-16b3-487d-8045-6dd94c661fc0">
                        <jr:detailCell style="table_TD" height="30" rowSpan="1">
                            <textField>
                                <reportElement x="0" y="0" width="90" height="30" uuid="5c07b5af-9e28-4a14-a70a-3789bfc88087"/>
                                <box leftPadding="2" rightPadding="2"/>
                                <textElement verticalAlignment="Middle"/>
                                <textFieldExpression><![CDATA[$F{mode}]]></textFieldExpression>
                            </textField>
                        </jr:detailCell>
                    </jr:column>
                    <jr:column width="90" uuid="d69567f0-ec7c-4b83-bc22-5aae1cab7879">
                        <jr:detailCell style="table_TD" height="30" rowSpan="1">
                            <textField>
                                <reportElement x="0" y="0" width="90" height="30" uuid="2a3a2055-f9c0-46e3-b816-b6ee1c989f9c"/>
                                <box leftPadding="2" rightPadding="2"/>
                                <textElement textAlignment="Right" verticalAlignment="Middle"/>
                                <textFieldExpression><![CDATA[$F{total}]]></textFieldExpression>
                            </textField>
                        </jr:detailCell>
                    </jr:column>
                </jr:table>
            </componentElement>
            <staticText>
                <reportElement x="120" y="5" width="180" height="20" uuid="9ef22e85-34ce-47c9-afad-2813a8a0b863"/>
                <textElement verticalAlignment="Middle"/>
                <text><![CDATA[Tx SubTotals]]></text>
            </staticText>
        </band>
    </summary>
</jasperReport>

public static void main(String[] args) throws JRException, FileNotFoundException {
    JasperReport report = JasperCompileManager.compileReport("myReport.jrxml");

    JRCsvDataSource datasource = new JRCsvDataSource(new File("data/datasource.csv"));
    datasource.setFieldDelimiter(';');
    datasource.setUseFirstRowAsHeader(true);
    datasource.setLocale(Locale.US);

    JasperPrint jasperPrint = JasperFillManager.fillReport(report, new HashMap<String, Object>(), datasource);

    JRPdfExporter exporter = new JRPdfExporter();       
    exporter.setExporterInput(new SimpleExporterInput(jasperPrint));
    exporter.setExporterOutput(new SimpleOutputStreamExporterOutput("pdf/example.pdf"));
    SimplePdfExporterConfiguration configuration = new SimplePdfExporterConfiguration();
    exporter.setConfiguration(configuration);
    exporter.exportReport();
}

package com.company.jasper;

import java.util.*;
import net.sf.jasperreports.engine.*;
import net.sf.jasperreports.engine.data.JRBeanCollectionDataSource;

public class TupleSumScriplet extends JRDefaultScriptlet {
    private final static String REPORT_KEY_COLUMN_NAME
            = "SCRIPTLET_KEY_COLUMN_NAME";
    private final static String REPORT_VALUE_COLUMN_NAME
            = "SCRIPTLET_VALUE_COLUMN_NAME";

    private final Map<String, Integer> sums = new HashMap<>();

    public TupleSumScriplet() { }

    @Override
    public void afterDetailEval() throws JRScriptletException {
        if (isSubreport()) {
            final String keyColumnName = getKeyColumnName();
            final String key = (String) getFieldValue(keyColumnName);

            final String valueColumnName = getValueColumnName();
            final int value = (Integer) getFieldValue(valueColumnName);

            final Map<String, Integer> totals = getSums();
            final int sum = totals.containsKey(key) ? totals.get(key) : 0;

            totals.put(key, sum + value);
        }
    }

    public JRDataSource getDataSource() {
        return new JRBeanCollectionDataSource(sort(getSums()));
    }

    public Map<String, Integer> getSums() {
        return this.sums;
    }

    private String getKeyColumnName() throws JRScriptletException {
        return (String) getParameterValue(REPORT_KEY_COLUMN_NAME);
    }

    protected String getValueColumnName() throws JRScriptletException {
        return (String) getParameterValue(REPORT_VALUE_COLUMN_NAME);
    }

    private boolean isSubreport() {
        boolean result;

        try {
            result = true;
            final String unused = getKeyColumnName();

        } catch (JRScriptletException e) {
            result = false;
        }

        return result;
    }

    public static
            <K extends Comparable<? super K>, V> Collection<Map.Entry<K, V>>
            sort(Map<K, V> map) {
        final List<Map.Entry<K, V>> list = new LinkedList<>(map.entrySet());

        Collections.sort(list, new Comparator<Map.Entry<K, V>>() {
            @Override
            public int compare(Map.Entry<K, V> o1, Map.Entry<K, V> o2) {
                return (o1.getKey()).compareTo(o2.getKey());
            }
        });

        return list;
    }
}

$P{REPORT_SCRIPTLET}.getDataSource()