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<div class="sect1"><!-- infolevel="all" infotype="General" -->
<h1 class="sect1"><font face="arial, helvetica, sans-serif" color="#330099">Using XML Transformations</font></h1>
<p>In many cases, you can use MOXy's <code>@XmlTransformation</code> annotation to give you considerably more control over the marshalling and unmarshalling of your objects. <code>@XmlTransformation</code> can be used to create a custom mapping where one or more XML nodes can be used to create the value for the Java attribute.</p>
<p>To handle the custom requirements at marshal (write) and unmarshall (read) time, <code>@XmlTransformation</code> uses instances of <code>org.eclipse.persistence.mappings.transformers</code> (such as <code>AttributeTransformer</code> and <code>FieldTransformer</code>), providing a non-intrusive solution that avoids the need for domain objects to implement any 'special' interfaces.</p>
<p>For example, if you wanted to map the following XML to objects and combine the values of <code>DATE</code> and <code>TIME</code> into a <code>single java.util.Date</code> object, you can use an <code>@XmlTransformation:</code></p>
<pre xml:space="preserve" class="oac_no_warn">
&lt;ELEM_B&gt;
&lt;B_DATE&gt;20100825&lt;/B_DATE&gt;
&lt;B_TIME&gt;153000&lt;/B_TIME&gt;
&lt;NUM&gt;123&lt;/NUM&gt;
&lt;C_DATE&gt;20100825&lt;/C_DATE&gt;
&lt;C_TIME&gt;154500&lt;/C_TIME&gt;
&lt;/ELEM_B&gt;
</pre>
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<p class="note"><img src="../../dcommon/images/note_icon.png" width="16" height="16" alt="Note" style="vertical-align:middle;padding-right:5px;" />Note:</p>
<p>Ordinarily, you would use <code>@XmlAdapter</code>. However:</p>
<ul>
<li>
<p>Although the <strong>DATE</strong>/<strong>TIME</strong> pairings are repeated throughout the document, the element name changes each time (such as <strong>B_DATE</strong>/<strong>B_TIME</strong>, <strong>C_DATE</strong>/<strong>C_TIME</strong>, and so on).</p>
</li>
<li>
<p>Because each pairing is missing a grouping element, you would need to adapt the <em>entire</em> <strong>ElemB</strong> class.</p>
</li>
</ul>
<p>Because of these issues, MOXy's transformation mapping is much easier to implement:</p>
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<div class="example"><a id="TLJAX430" name="TLJAX430"></a><a id="sthref187" name="sthref187"></a>
<p><strong><em><font face="arial, helvetica, sans-serif">Example 8-38 Mapping Example</font></em></strong></p>
<pre xml:space="preserve" class="oac_no_warn">
package example;
import java.util.Date;
import javax.xml.bind.annotation.*;
import org.eclipse.persistence.oxm.annotations.*;
@XmlAccessorType(XmlAccessType.FIELD)
@XmlRootElement(name="ELEM_B")
public class ElemB {
@XmlTransformation
@XmlReadTransformer(transformerClass=DateAttributeTransformer.class)
@XmlWriteTransformers({
@XmlWriteTransformer(xmlPath="B_DATE/text()", transformerClass=DateFieldTransformer.class),
@XmlWriteTransformer(xmlPath="B_TIME/text()", transformerClass=TimeFieldTransformer.class),
})
private Date bDate;
@XmlElement(name="NUM")
private int num;
@XmlTransformation
@XmlReadTransformer(transformerClass=DateAttributeTransformer.class)
@XmlWriteTransformers({
@XmlWriteTransformer(xmlPath="C_DATE/text()", transformerClass=DateFieldTransformer.class),
@XmlWriteTransformer(xmlPath="C_TIME/text()", transformerClass=TimeFieldTransformer.class),
})
private Date cDate;
}
</pre></div>
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<div class="sect2"><a id="sthref188" name="sthref188"></a>
<h2 class="sect2"><font face="arial, helvetica, sans-serif" color="#330099">Using an AttributeTransformer</font></h2>
<p>Use an <code>AttributeTransformer</code> to construct the Java attribute value:</p>
<div class="example"><a id="TLJAX432" name="TLJAX432"></a><a id="sthref189" name="sthref189"></a>
<p><strong><em><font face="arial, helvetica, sans-serif">Example 8-39 Sample AttributeTransfomer</font></em></strong></p>
<pre xml:space="preserve" class="oac_no_warn">
package example;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import org.eclipse.persistence.internal.helper.DatabaseField;
import org.eclipse.persistence.mappings.foundation.AbstractTransformationMapping;
import org.eclipse.persistence.mappings.transformers.AttributeTransformer;
import org.eclipse.persistence.sessions.Record;
import org.eclipse.persistence.sessions.Session;
public class DateAttributeTransformer implements <strong>AttributeTransformer </strong>{
private AbstractTransformationMapping mapping;
private SimpleDateFormat yyyyMMddHHmmss = new SimpleDateFormat("yyyyMMddHHmmss");
public void initialize(AbstractTransformationMapping mapping) {
this.mapping = mapping;
}
public Object buildAttributeValue(Record record, Object instance, Session session) {
try {
String dateString = null;
String timeString = null;
for (DatabaseField field : mapping.getFields()) {
if (field.getName().contains("DATE")) {
dateString = (String) record.get(field);
} else {
timeString = (String) record.get(field);
}
}
return yyyyMMddHHmmss.parseObject(dateString + timeString);
} catch(ParseException e) {
throw new RuntimeException(e);
}
}
}
</pre></div>
<!-- class="example" --></div>
<!-- class="sect2" -->
<a id="TLJAX433" name="TLJAX433"></a>
<div class="sect2"><a id="sthref190" name="sthref190"></a>
<h2 class="sect2"><font face="arial, helvetica, sans-serif" color="#330099">Using a FieldTransformer</font></h2>
<p>Use a <code>FieldTransformer</code> to construct the XML field value from the Java object.</p>
<p>Each transformation mapping may have multiple write transformers. In this example, you will need two:</p>
<ul>
<li>
<p>The first write transformer writes the year, month, and day in <strong>yyMMdd</strong> format:</p>
<div class="example"><a id="TLJAX434" name="TLJAX434"></a><a id="sthref191" name="sthref191"></a>
<p><strong><em><font face="arial, helvetica, sans-serif">Example 8-40 First Write Transformer</font></em></strong></p>
<pre xml:space="preserve" class="oac_no_warn">
package example;
import java.text.SimpleDateFormat;
import java.util.Date;
import org.eclipse.persistence.mappings.foundation.AbstractTransformationMapping;
import org.eclipse.persistence.mappings.transformers.FieldTransformer;
import org.eclipse.persistence.sessions.Session;
public class DateFieldTransformer implements FieldTransformer {
private AbstractTransformationMapping mapping;
private SimpleDateFormat yyyyMMdd = new SimpleDateFormat("yyyyMMdd");
public void initialize(AbstractTransformationMapping mapping) {
this.mapping = mapping;
}
public Object buildFieldValue(Object instance, String xPath, Session session) {
Date date = (Date) mapping.getAttributeValueFromObject(instance);
return yyyyMMdd.format(date);
}
}
</pre></div>
<!-- class="example" --></li>
<li>
<p>The second write transformer writes out the hour, minutes, and seconds in <strong>HHmmss</strong> format.</p>
<div class="example"><a id="TLJAX435" name="TLJAX435"></a><a id="sthref192" name="sthref192"></a>
<p><strong><em><font face="arial, helvetica, sans-serif">Example 8-41 Second Write Transformer</font></em></strong></p>
<pre xml:space="preserve" class="oac_no_warn">
package example;
import java.text.SimpleDateFormat;
import java.util.Date;
import org.eclipse.persistence.mappings.foundation.AbstractTransformationMapping;
import org.eclipse.persistence.mappings.transformers.FieldTransformer;
import org.eclipse.persistence.sessions.Session;
public class TimeFieldTransformer implements FieldTransformer {
private AbstractTransformationMapping mapping;
private SimpleDateFormat HHmmss = new SimpleDateFormat("HHmmss");
public void initialize(AbstractTransformationMapping mapping) {
this.mapping = mapping;
}
public Object buildFieldValue(Object instance, String xPath, Session session) {
Date date = (Date) mapping.getAttributeValueFromObject(instance);
return HHmmss.format(date);
}
}
</pre></div>
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