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<td colspan="2" align="right"><span class="element"><a href="../../sample.reference.html">Sample Reference</a> - <a href="../../schema.reference.html">Schema Reference</a> - <a href="../../config.reference.html">Configuration Reference</a> - <a href="http://jasperreports.sourceforge.net/api/index.html">API (Javadoc)</a></span>
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<td nowrap="true"><span class="title">JasperReports - XML Data Source Sample (version 4.0.2)</span></td><td align="right"><img src="../../resources/jasperreports.png" border="0"></td>
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<br>
<span class="description"><span class="description">Shows how the built-in XPath-based data source could be used for reporting out of XML data.</span></span>
<br>
<br>
<span class="element"><a href="http://sourceforge.net/projects/jasperreports/files/jasperreports/JasperReports%204.0.2/jasperreports-4.0.2-project.zip/download" target="_blank">Download All Sample Source Files</a></span>
<br>
<span class="element"><a href="http://jasperforge.org/scm/viewvc.php/tags/jr-4-0-2/jasperreports/demo/samples/xmldatasource/?root=jasperreports" target="_blank">Browse Sample Source Files on SVN</a></span>
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<td style="width: 20px;">
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</td><td>
<br>
</td>
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<tr>
<td colspan="2"><span class="label">Main Features in This Sample</span></td>
</tr>
<tr>
<td>
<br>
</td><td><span class="element"><a href="#xmldatasource">XML Data Source</a></span></td>
</tr>
<tr>
<td>
<br>
</td><td><span class="element"><a href="#xpathqueryexecuter">XPath Query Executer</a></span></td>
</tr>
<tr>
<td colspan="2">
<br>
</td>
</tr>
<tr>
<td colspan="2"><span class="label">Secondary Features</span></td>
</tr>
<tr>
<td></td><td><span class="element"><a href="../hibernate/index.html#queryexecuters">Query Executers</a></span></td>
</tr>
<tr>
<td></td><td><span class="element"><a href="../datasource/index.html#datasources">Data Sources</a></span></td>
</tr>
<tr>
<td></td><td><span class="element"><a href="../subreport/index.html#subreports">Subreports</a></span></td>
</tr>
</table>
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<td><img src="../../resources/px.gif" border="0" width="20" height="1"></td><td><img src="../../resources/px.gif" border="0" width="20" height="1"></td><td><img src="../../resources/px.gif" border="0" width="20" height="1"></td><td><img src="../../resources/px.gif" border="0" width="20" height="1"></td><td width="80%">
<br>
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<td colspan="6" align="right"><a name="xmldatasource"></a><a href="#top" class="toc">top</a></td>
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<hr size="1">
</td>
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<tr valign="top">
<td><img src="../../resources/jr-16x16.png" border="0"></td><td colspan="4"><span class="name">XML Data Source</span></td><td align="right"><span class="copy">Documented by
<a href="mailto:shertage@users.sourceforge.net" class="copy">Sanda Zaharia</a></span></td>
</tr>
<tr>
<td colspan="6">
<br>
</td>
</tr>
<tr valign="top">
<td>
<br>
</td><td nowrap="true"><span class="label">Description / Goal</span></td><td>
<br>
</td><td colspan="3"><span class="description">
How to fill a report using data from an XML file.
</span></td>
</tr>
<tr valign="top">
<td>
<br>
</td><td colspan="1"><span class="label">Since</span></td><td>
<br>
</td><td colspan="3"><span class="description">0.6.0</span></td>
</tr>
<tr>
<td colspan="6">
<br>
</td>
</tr>
<tr>
<td>
<br>
</td><td colspan="5"><span class="description">
<b><a name="xmlds">XML</a> Data Sources</b>
<br>
<br>
XML documents can be used as report data sources based on appropriate
<span class="element"><a href="http://jasperreports.sourceforge.net/api/net/sf/jasperreports/engine/JRDataSource.html" target="_blank">JRDataSource</a></span>
implementations. JasperReports features a built-in XML data source implementation
(<span class="element"><a href="http://jasperreports.sourceforge.net/api/net/sf/jasperreports/engine/data/JRXmlDataSource.html" target="_blank">JRXmlDataSource</a></span>) that relies on DOM
and uses XPath expressions to select data from the XML document.
<br>
To instantiate an XML data source, the following inputs are required:
<ul>
<li>An XML document. The parsed document, its location, or its source is provided as an argument to the data source constructor.</li>
<li>An XPath expression to select the node set that corresponds to the data source record list. The
expression is passed to the data source as a constructor argument. The default XPath expression selects
the document node itself. The XPath expression is executed when the
data source is instantiated; each item in the resulting node set will generate a
record in the data source.</li>
<li>An XPath expression to select the field value for every field in the data set,
when iterating through records. The field’s XPath expression is provided by the field description
(<span class="code"><code><fieldDescription></code></span> element in JRXML).</li>
</ul>
One interesting particularity of XML data sources is that they can be used to
create sub–data sources to be used for subreports or subdatasets, using different
XPath expressions to select the appropriate nodes. There are two ways to accomplish this:
<ul>
<li>A sub–data source can be created for a new document that uses the current node as
a root node.</li>
<li>The same document can be reused for a new sub–data source, which would specify
a different XPath expression for the main node set.</li>
</ul>
XML data sources are created by interpreting XPath expressions and selecting nodes and
values from the XML document based on these expressions. Processing XPath expressions
relies on a generic service interface called <span class="element"><a href="http://jasperreports.sourceforge.net/api/net/sf/jasperreports/engine/util/JRXPathExecuter.html" target="_blank">JRXPathExecuter</a></span>.
The XPath executer implementation used by XML data sources can be configured with a
JasperReports property named <span class="code"><code>net.sf.jasperreports.xpath.executer.factory</code></span>.
This property gives the name of an XPath executer factory class, which has to implement
the <span class="element"><a href="http://jasperreports.sourceforge.net/api/net/sf/jasperreports/engine/util/xml/JRXPathExecuterFactory.html" target="_blank">JRXPathExecuterFactory</a></span>.
<br>
The XML data source provides localization support for both number and date/time
values rendered as text in the wrapped XML document. In order to get the appropriate
localization one have to set the following information in the <span class="code"><code>JRXmlDataSource</code></span> object:
<ul>
<li>the Number pattern - see the <span class="code"><code>setNumberPattern(java.lang.String)</code></span> method;</li>
<li>the Date pattern - see the <span class="code"><code>setDatePattern(java.lang.String)</code></span> method;</li>
<li>the Locale property - see the <span class="code"><code>setLocale(java.util.Locale)</code></span> method;</li>
<li>the time zone - see the <span class="code"><code>setTimeZone(java.util.TimeZone)</code></span> method.</li>
</ul>
Patterns should be non-localized and in accordance with the
<span class="code"><code>java.text.DecimalFormat</code></span> and <span class="code"><code>java.text.SimpleDateFormat</code></span> pattern syntax. If
specific patterns are not supplied, the defaults for these two format classes apply.
<br>
<br>
Before running the sample, please consult the next section regarding the XPath query executer.
</span></td>
</tr>
<tr>
<td colspan="6">
<br>
</td>
</tr>
<tr>
<td colspan="6" align="right"><a name="xpathqueryexecuter"></a><a href="#top" class="toc">top</a></td>
</tr>
<tr>
<td colspan="6">
<hr size="1">
</td>
</tr>
<tr valign="top">
<td><img src="../../resources/jr-16x16.png" border="0"></td><td colspan="4"><span class="name">XPath Query Executer</span></td><td align="right"><span class="copy">Documented by
<a href="mailto:shertage@users.sourceforge.net" class="copy">Sanda Zaharia</a></span></td>
</tr>
<tr>
<td colspan="6">
<br>
</td>
</tr>
<tr valign="top">
<td>
<br>
</td><td nowrap="true"><span class="label">Description / Goal</span></td><td>
<br>
</td><td colspan="3"><span class="description">
How to fill reports using embedded XPath queries.
</span></td>
</tr>
<tr valign="top">
<td>
<br>
</td><td colspan="1"><span class="label">Since</span></td><td>
<br>
</td><td colspan="3"><span class="description">1.2.0</span></td>
</tr>
<tr valign="top">
<td>
<br>
</td><td nowrap="true"><span class="label">Other Samples</span></td><td>
<br>
</td><td colspan="3">
<table width="100%" cellspacing="0" cellpadding="0" border="0">
<tr>
<td><span class="element"><a href="../csvdatasource/index.html">/demo/samples/csvdatasource</a></span></td>
</tr>
<tr>
<td><span class="element"><a href="../ejbql/index.html">/demo/samples/ejbql</a></span></td>
</tr>
<tr>
<td><span class="element"><a href="../hibernate/index.html">/demo/samples/hibernate</a></span></td>
</tr>
<tr>
<td><span class="element"><a href="../mondrian/index.html">/demo/samples/mondrian</a></span></td>
</tr>
</table>
</td>
</tr>
<tr>
<td colspan="6">
<br>
</td>
</tr>
<tr>
<td>
<br>
</td><td colspan="5"><span class="description">
<b>The XPath Query Executer</b>
<br>
<br>
XPath (the <b>X</b>ML <b>Path</b> language) is an expression language with specific syntax
used to navigate through nodes in an XML document and retrieve their information,
based on a tree representation of XML documents. When using XML data sources, one
can specify an XPath expression that produces the list of nodes/records as the report query:
<br>
<br>
<span class="code"><code> <queryString language="xPath"><![CDATA[/Northwind/Orders[CustomerID='ALFKI']]]></queryString></code></span>
<br>
<br>
This query returns a list containing only <span class="code"><code>Orders</code></span> elements with <span class="code"><code>CustomerID</code></span> set to <span class="code"><code>ALFKI</code></span>.
<br>
<br>
In the case of the XPath language the query executer factory (see the
<span class="element"><a href="http://jasperreports.sourceforge.net/api/net/sf/jasperreports/engine/query/JRXPathQueryExecuterFactory.html" target="_blank">JRXPathQueryExecuterFactory</a></span> class) registers a parameter named
<span class="element"><a href="http://jasperreports.sourceforge.net/api/net/sf/jasperreports/engine/query/JRXPathQueryExecuterFactory.html#PARAMETER_XML_DATA_DOCUMENT" target="_blank">XML_DATA_DOCUMENT</a></span>
of type <span class="code"><code>org.w3c.dom.Document</code></span>. The XPath query executer (see the
<span class="element"><a href="http://jasperreports.sourceforge.net/api/net/sf/jasperreports/engine/query/JRXPathQueryExecuter.html" target="_blank">JRXPathQueryExecuter</a></span> class) runs the XPath query against this document
and stores the result in an in-memory
<span class="element"><a href="http://jasperreports.sourceforge.net/api/net/sf/jasperreports/engine/data/JRXmlDataSource.html" target="_blank">JRXmlDataSource</a></span> object. For more
information about XML data sources please consult the <a href="#xmlds" target="_blank" class="element">XML Data Sources</a> above section.
<br>
<br>
Being an expression language itself, XPath supports parameters. Parameters will be processed and replaced
by their <span class="code"><code>java.lang.String</code></span> values. When creating the JRXmlDataSource instance, the query executer
also provides the four additional parameters containing localization settings required by the data source:
<ul>
<li>
<span class="element"><a href="http://jasperreports.sourceforge.net/api/net/sf/jasperreports/engine/query/JRXPathQueryExecuterFactory.html#XML_LOCALE" target="_blank">XML_LOCALE</a></span>
</li>
<li>
<span class="element"><a href="http://jasperreports.sourceforge.net/api/net/sf/jasperreports/engine/query/JRXPathQueryExecuterFactory.html#XML_NUMBER_PATTERN" target="_blank">XML_NUMBER_PATTERN</a></span>
</li>
<li>
<span class="element"><a href="http://jasperreports.sourceforge.net/api/net/sf/jasperreports/engine/query/JRXPathQueryExecuterFactory.html#XML_DATE_PATTERN" target="_blank">XML_DATE_PATTERN</a></span>
</li>
<li>
<span class="element"><a href="http://jasperreports.sourceforge.net/api/net/sf/jasperreports/engine/query/JRXPathQueryExecuterFactory.html#XML_TIME_ZONE" target="_blank">XML_TIME_ZONE</a></span>
</li>
</ul>
In the next section you can see how these additional parameters are set in the <a href="#fill" target="_blank" class="element">fill()</a> method of the <span class="code"><code>/src/XmlDataSourceApp.java</code></span> class.
<br>
<br>
For more information about the XPath syntax and queries, one can consult the official documentation:
<a href="http://www.w3.org/TR/xpath20" target="_blank" class="element">http://www.w3.org/TR/xpath20</a>.
<br>
<br>
<b>XML Data Source Example</b>
<br>
<br>
In our example data records are stored as node elements in the <span class="code"><code>data/northwind.xml</code></span> file.
<br>
The <span class="code"><code><Northwind/></code></span> root element contains two children types: <span class="code"><code><Customers/></code></span> and <span class="code"><code><Orders/></code></span>.
Below is an example of a <span class="code"><code><Customers/></code></span> entity, completely characterized by the following elements:
<pre>
<Customers>
<CustomerID>ALFKI</CustomerID>
<CompanyName>Alfreds Futterkiste</CompanyName>
<ContactName>Maria Anders</ContactName>
<ContactTitle>Sales Representative</ContactTitle>
<Address>Obere Str. 57</Address>
<City>Berlin</City>
<PostalCode>12209</PostalCode>
<Country>Germany</Country>
<Phone>030-0074321</Phone>
<Fax>030-0076545</Fax>
</Customers>
</pre>
And below is an example of an <span class="code"><code><Orders/></code></span> entity:
<pre>
<Orders>
<OrderID>10643</OrderID>
<CustomerID>ALFKI</CustomerID>
<EmployeeID>6</EmployeeID>
<OrderDate>1997-08-25</OrderDate>
<RequiredDate>1997-09-22</RequiredDate>
<ShippedDate>1997-09-02</ShippedDate>
<ShipVia>1</ShipVia>
<Freight>29.46</Freight>
<ShipName>Alfreds Futterkiste</ShipName>
<ShipAddress>Obere Str. 57</ShipAddress>
<ShipCity>Berlin</ShipCity>
<ShipPostalCode>12209</ShipPostalCode>
<ShipCountry>Germany</ShipCountry>
</Orders>
</pre>
One can see that an <span class="code"><code><Orders></code></span> element has a <span class="code"><code><CustomerID></code></span> property which
points to the <span class="code"><code><CustomerID></code></span> element in the <span class="code"><code><Customers></code></span> node, just like
a foreign key in a relational database. One can identify a one-to-many relationship between <span class="code"><code><Customers></code></span>
and <span class="code"><code><Orders></code></span>.
<br>
In order to navigate through elements in the <span class="code"><code>Northwind.xml</code></span> document, an XPath query executer implementation should
be specified using the <span class="code"><code>net.sf.jasperreports.xpath.executer.factory</code></span> property. In our case it is set in the
<span class="code"><code>src/jasperreports.properties</code></span> file:
<br>
<br>
<span class="code"><code>net.sf.jasperreports.xpath.executer.factory=net.sf.jasperreports.engine.util.xml.JaxenXPathExecuterFactory</code></span>
<br>
<br>
Two <span class="code"><code>JRXmlDataSource</code></span> objects are necessary to store the two element types.
One of them will be populated with <span class="code"><code>Customers</code></span> records. In this case
record field names are given by the property names in the <span class="code"><code><Customers/></code></span> node:
<ul>
<li>
<span class="code"><code>CustomerID</code></span>
</li>
<li>
<span class="code"><code>CompanyName</code></span>
</li>
<li>
<span class="code"><code>ContactName</code></span>
</li>
<li>
<span class="code"><code>Sales Representative</code></span>
</li>
<li>
<span class="code"><code>ContactTitle</code></span>
</li>
<li>
<span class="code"><code>Address</code></span>
</li>
<li>
<span class="code"><code>City</code></span>
</li>
<li>
<span class="code"><code>PostalCode</code></span>
</li>
<li>
<span class="code"><code>Country</code></span>
</li>
<li>
<span class="code"><code>Phone</code></span>
</li>
<li>
<span class="code"><code>Fax</code></span>
</li>
</ul>
The other <span class="code"><code>JRXmlDataSource</code></span> object will be populated with <span class="code"><code>Orders</code></span> records.
For this record type, field names are:
<ul>
<li>
<span class="code"><code>OrderID</code></span>
</li>
<li>
<span class="code"><code>CustomerID</code></span>
</li>
<li>
<span class="code"><code>EmployeeID</code></span>
</li>
<li>
<span class="code"><code>OrderDate</code></span>
</li>
<li>
<span class="code"><code>RequiredDate</code></span>
</li>
<li>
<span class="code"><code>ShippedDate</code></span>
</li>
<li>
<span class="code"><code>ShipVia</code></span>
</li>
<li>
<span class="code"><code>Freight</code></span>
</li>
<li>
<span class="code"><code>ShipName</code></span>
</li>
<li>
<span class="code"><code>ShipAddress</code></span>
</li>
<li>
<span class="code"><code>ShipCity</code></span>
</li>
<li>
<span class="code"><code>ShipPostalCode</code></span>
</li>
<li>
<span class="code"><code>ShipCountry</code></span>
</li>
</ul>
As we'll see later, not all fields above are required by the generated report.
<br>
<br>
There are two JRXML files in the <span class="code"><code>reports</code></span> directory. The <span class="code"><code>CustomersReport.jrxml</code></span>
is the main report template. The <span class="code"><code>OrdersReport.jrxml</code></span> is used for generate subreports for the main report.
The main report iterates through available customers in the XML data source, and prints for each of them
the Customer ID, the Company Name and the own list of ship orders. The orders list exposes only the
Order ID, Order Date, Ship City and Freight fields. For each customer
are calculated the orders count and the total freight.
<br>
In the <span class="code"><code>CustomersReport.jrxml</code></span> template the query language and XPath query expression are declared in
the <span class="code"><code><queryString/></code></span> expression:
<br>
<br>
<queryString language="xPath"><![CDATA[/Northwind/Customers]]></queryString>
<br>
<br>
The fields required for each <span class="code"><code>Customer</code></span> in the main report are:
<pre>
<field name="CustomerID" class="java.lang.String">
<fieldDescription>CustomerID</fieldDescription>
</field>
<field name="CompanyName" class="java.lang.String">
<fieldDescription>CompanyName</fieldDescription>
</field>
</pre>
The <span class="code"><code>OrdersReport</code></span> subreport is called when the orders list has to be completed for each customers:
<pre>
<subreport>
<reportElement isPrintRepeatedValues="false" x="5" y="25" width="507" height="20" isRemoveLineWhenBlank="true" backcolor="#ffcc99"/>
<subreportParameter name="XML_DATA_DOCUMENT">
<subreportParameterExpression>$P{XML_DATA_DOCUMENT}</subreportParameterExpression>
</subreportParameter>
<subreportParameter name="XML_DATE_PATTERN">
<subreportParameterExpression>$P{XML_DATE_PATTERN}</subreportParameterExpression>
</subreportParameter>
<subreportParameter name="XML_NUMBER_PATTERN">
<subreportParameterExpression>$P{XML_NUMBER_PATTERN}</subreportParameterExpression>
</subreportParameter>
<subreportParameter name="XML_LOCALE">
<subreportParameterExpression>$P{XML_LOCALE}</subreportParameterExpression>
</subreportParameter>
<subreportParameter name="XML_TIME_ZONE">
<subreportParameterExpression>$P{XML_TIME_ZONE}</subreportParameterExpression>
</subreportParameter>
<subreportParameter name="CustomerID">
<subreportParameterExpression>$F{CustomerID}</subreportParameterExpression>
</subreportParameter>
<subreportExpression class="java.lang.String">"OrdersReport.jasper"</subreportExpression>
</subreport>
</pre>
The Number pattern, Date pattern, Locale and time zone parameters above are necessary for data formatting.
The <span class="code"><code>CustomerID</code></span> parameter is required in order to filter data in the subreport.
<br>
<br>
The <span class="code"><code><queryString/></code></span> expression in the <span class="code"><code>reports/OrdersReport.jrxml</code></span> template is:
<br>
<br>
<queryString language="xPath"><![CDATA[/Northwind/Orders[CustomerID='$P{CustomerID}']]]></queryString>
<br>
<br>
Only <span class="code"><code>Orders</code></span> with the given <span class="code"><code>CustomerID</code></span> are taken into account.
<br>
The only fields required from an <span class="code"><code>Orders</code></span> record are:
<pre>
<field name="Id" class="java.lang.String">
<fieldDescription>OrderID</fieldDescription>
</field>
<field name="OrderDate" class="java.util.Date">
<fieldDescription>OrderDate</fieldDescription>
</field>
<field name="ShipCity" class="java.lang.String">
<fieldDescription>ShipCity</fieldDescription>
</field>
<field name="Freight" class="java.lang.Float">
<fieldDescription>Freight</fieldDescription>
</field>
</pre>
<a name="fill">In</a> the <span class="code"><code>src/XmlDataSourceApp.java</code></span> all necessary information is prepared to be sent at fill time:
the parsed <span class="code"><code>Northwind</code></span> document, data formatting parameters and the <span class="code"><code>CustomersReport</code></span> compiled report:
<pre>
public void fill() throws JRException
{
long start = System.currentTimeMillis();
Map params = new HashMap();
Document document = JRXmlUtils.parse(JRLoader.getLocationInputStream("data/northwind.xml"));
params.put(JRXPathQueryExecuterFactory.PARAMETER_XML_DATA_DOCUMENT, document);
params.put(JRXPathQueryExecuterFactory.XML_DATE_PATTERN, "yyyy-MM-dd");
params.put(JRXPathQueryExecuterFactory.XML_NUMBER_PATTERN, "#,##0.##");
params.put(JRXPathQueryExecuterFactory.XML_LOCALE, Locale.ENGLISH);
params.put(JRParameter.REPORT_LOCALE, Locale.US);
JasperFillManager.fillReportToFile("build/reports/CustomersReport.jasper", params);
System.err.println("Filling time : " + (System.currentTimeMillis() - start));
}
</pre>
<b>Running the Sample</b>
<br>
<br>
Running the sample requires the <a href="http://ant.apache.org/" target="_blank" class="element">Apache Ant</a> library. Make sure that <span class="code"><code>ant</code></span> is already installed on your system (version 1.5 or later).
<br>
In a command prompt/terminal window set the current folder to <span class="code"><code>demo/samples/xmldatasource</code></span> within the JasperReports source project and run the <span class="code"><code>> ant test view</code></span> command.
<br>
It will generate all supported document types containing the sample report in the <span class="code"><code>demo/samples/xmldatasource/build/reports</code></span> directory.
<br>
Then the report will open in the JasperReports internal viewer.
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<td align="center"><span class="copy">© 2001-2010 Jaspersoft Corporation <a href="http://www.jaspersoft.com" target="_blank" class="copy">www.jaspersoft.com</a></span></td>
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