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 <b>Release 2.7</b><br /></font></td>
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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>
 <div align="center">
 <div class="inftblnote"><br />
 <table class="Note oac_no_warn" summary="" border="1" width="80%" frame="hsides" rules="groups" cellpadding="3" cellspacing="0">
 <tbody>
 <tr>
 <td align="left">
 <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>
 </td>
 </tr>
 </tbody>
 </table>
 <br /></div>
 <!-- class="inftblnote" --></div>
 <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>
 <!-- class="example" -->
 <a id="TLJAX431" name="TLJAX431"></a>
 <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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	<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">
	<ELEM_B>
	<B_DATE>20100825</B_DATE>
	<B_TIME>153000</B_TIME>
	<NUM>123</NUM>
	<C_DATE>20100825</C_DATE>
	<C_TIME>154500</C_TIME>
	</ELEM_B>
	</pre>
	<div align="center">
	<div class="inftblnote"><br />
	<table class="Note oac_no_warn" summary="" border="1" width="80%" frame="hsides" rules="groups" cellpadding="3" cellspacing="0">
	<tbody>
	<tr>
	<td align="left">
	<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>
	</td>
	</tr>
	</tbody>
	</table>
	<br /></div>
	<!-- class="inftblnote" --></div>
	<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>
	<!-- class="example" -->
	<a id="TLJAX431" name="TLJAX431"></a>
	<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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