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Difference between revisions of "EclipseLink/UserGuide/MOXy/Simple Values/Single Values/XMLDirectMapping"

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===Mapping to a Text Node in a Simple Sequence===
 
===Mapping to a Text Node in a Simple Sequence===
Given the XML schema in the [[#Example 58-4|Schema for XML Direct Mapping to a Text Node in a Simple Sequence]] example, the [[#Figure 58-2|XML Direct Mapping to a Text Node in a Simple Sequence]] figure illustrates an XML direct mapping to individual text nodes in a sequence in a corresponding XML document.
+
Given the XML schema in this example, the figure below illustrates an XML direct mapping to individual text nodes in a sequence in a corresponding XML document.
  
<span id="''Example 58-4"></span>
 
'''''Schema for XML Direct Mapping to a Text Node in a Simple Sequence'''''
 
 
<source lang="xml">
 
<source lang="xml">
 
<?xml version="1.0" encoding="UTF-8"?>
 
<?xml version="1.0" encoding="UTF-8"?>
Line 89: Line 87:
 
</xsd:schema>
 
</xsd:schema>
 
</source>
 
</source>
 
<span id="Figure 58-2"></span>
 
'''''XML Direct Mapping to a Text Node in a Simple Sequence'''''
 
  
 
[[Image:dxmss.gif|XML Direct Mapping to a Text Node in a Simple Sequence]]<br><br>
 
[[Image:dxmss.gif|XML Direct Mapping to a Text Node in a Simple Sequence]]<br><br>
  
The [[#Example 58-5|Java for XML Direct Mapping to a Text Node in a Simple Sequence]] example shows how to annotate your Java class to obtain this mapping with EclipseLink. Here, the standard JAXB <tt>@XmlElement</tt> annotation is used, with a customized element name.
+
The following example shows how to annotate your Java class to obtain this mapping with EclipseLink. Here, the standard JAXB <tt>@XmlElement</tt> annotation is used, with a customized element name.
  
<span id="Example 58-5"></span>
 
'''''Java for XML Direct Mapping to a Text Node in a Simple Sequence'''''
 
 
<source lang="java">
 
<source lang="java">
 
@XmlRootElement
 
@XmlRootElement
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</source>
 
</source>
  
The [[#Example 58-5-2|OXM for XML Direct Mapping to a Text Node in a Simple Sequence]] example shows how to to define your mapping information in EclipseLink's OXM metadata format.  To specify a custom element name, the <tt>name</tt> attribute is used.
+
The example below shows how to to define your mapping information in EclipseLink's OXM metadata format.  To specify a custom element name, the <tt>name</tt> attribute is used.
  
<span id="Example 58-5-2"></span>
 
'''''OXM for XML Direct Mapping to a Text Node in a Simple Sequence'''''
 
 
<source lang="xml">
 
<source lang="xml">
 
...
 
...

Revision as of 12:13, 22 December 2010


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XML Direct Mappings

XML direct mappings map a Java attribute directly to XML text nodes. You can use an XML direct mapping in the following scenarios:


Mapping to an Attribute

Given the XML schema in this example, the figure below illustrates an XML direct mapping to an attribute in a corresponding XML document.

<?xml version="1.0" encoding="UTF-8"?>
<xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema">
 
   <xsd:element name="customer" type="customer-type"/>
 
   <xsd:complexType name="customer-type">
      <xsd:attribute name="id" type="xsd:integer"/>
   </xsd:complexType>
 
</xsd:schema>

XML Direct Mapping to an Attribute

The following example shows how to annotate your Java class to obtain this mapping with EclipseLink. All that is needed is the standard JAXB @XmlAttribute annotation.

@XmlRootElement
public class Customer {
   @XmlAttribute
   public Integer id;
}

The example below shows how to to define your mapping information in EclipseLink's OXM metadata format.

...
<java-type name="Customer">
   <xml-root-element name="customer"/>
   <java-attributes>
      <xml-attribute java-attribute="id"/>
   </java-attributes>
</java-type>
...



Mapping to a Text Node

This section describes using an XML direct mapping when doing the following:


Mapping to a Text Node in a Simple Sequence

Given the XML schema in this example, the figure below illustrates an XML direct mapping to individual text nodes in a sequence in a corresponding XML document.

<?xml version="1.0" encoding="UTF-8"?>
<xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema">
 
   <xsd:element name="customer" type="customer-type"/>
 
   <xsd:complexType name="customer-type">
      <xsd:sequence>
         <xsd:element name="first-name" type="xsd:string"/>
         <xsd:element name="last-name" type="xsd:string"/>
      </xsd:sequence>
   </xsd:complexType>
 
</xsd:schema>

XML Direct Mapping to a Text Node in a Simple Sequence

The following example shows how to annotate your Java class to obtain this mapping with EclipseLink. Here, the standard JAXB @XmlElement annotation is used, with a customized element name.

@XmlRootElement
public class Customer {
   @XmlElement(name="first-name")
   public String firstName;
   @XmlElement(name="last-name")
   public String lastName;
}

The example below shows how to to define your mapping information in EclipseLink's OXM metadata format. To specify a custom element name, the name attribute is used.

...
<java-type name="Customer">
   <xml-root-element name="customer"/>
   <java-attributes>
      <xml-element java-attribute="firstName" name="first-name"/>
      <xml-element java-attribute="lastName" name="last-name"/>
   </java-attributes>
</java-type>
...



Mapping to a Text Node in a Subelement

Given the XML schema in the Schema for XML Direct Mapping to a Text Node in a Subelement example, the XML Direct Mapping to a Text Node in a Subelement figure illustrates an XML direct mapping to a text node in a subelement in a corresponding XML document.

Schema for XML Direct Mapping to a Text Node in a Subelement

<?xml version="1.0" encoding="UTF-8"?>
<xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema">
 
   <xsd:element name="customer" type="customer-type"/>
 
   <xsd:complexType name="customer-type">
      <xsd:sequence>
         <xsd:element name="personal-info">
            <xsd:complexType>
               <xsd:sequence>
                  <xsd:element name="first-name" type="xsd:string"/>
                  <xsd:element name="last-name" type="xsd:string"/>
               <xsd:sequence>
            </xsd:complexType>
         </xsd:element>
      </xsd:sequence>
   </xsd:complexType>
 
</xsd:schema>

XML Direct Mapping to a Text Node in a Subelement

XML Direct Mapping to a Text Node in a Subelement

The Java for XML Direct Mapping to a Text Node in a Subelemen example shows how to annotate your Java class to obtain this mapping with EclipseLink. Here, because we are going beyond a simple element name customization and are actually introducing new XML structure, EclipseLink's @XmlPath annotation is used.

Java for XML Direct Mapping to a Text Node in a Subelement

@XmlRootElement
public class Customer {
   @XmlPath("personal-info/first-name/text()")
   public String firstName;
   @XmlPath("personal-info/last-name/text()")
   public String lastName;
}

The OXM for XML Direct Mapping to a Text Node in a Subelemen example shows how to to define your mapping information in EclipseLink's OXM metadata format. Here, the customized XML path is defined in the xml-path attribute.

OXM for XML Direct Mapping to a Text Node in a Subelement

...
<java-type name="Customer">
   <xml-root-element name="customer"/>
   <java-attributes>
      <xml-element java-attribute="firstName" xml-path="personal-info/first-name/text()"/>
      <xml-element java-attribute="lastName" xml-path="personal-info/last-name/text()"/>
   </java-attributes>
</java-type>
...



Mapping to a Text Node by Position

Given the XML schema in the Schema for XML Direct Mapping to Text Node by Position exampple, the XML Direct Mapping to Text Node by Position figure illustrates an XML direct mapping to a text node by position in a corresponding XML document.

Schema for XML Direct Mapping to Text Node by Position

<?xml version="1.0" encoding="UTF-8"?>
<xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema">
 
   <xsd:element name="customer" type="customer-type"/>
 
   <xsd:complexType name="customer-type">
      <xsd:sequence>
         <xsd:element name="name" type="xsd:string" maxOccurs="2"/>
      </xsd:sequence>
   </xsd:complexType>
 
</xsd:schema>

XML Direct Mapping to Text Node by Position

XML Direct Mapping to Text Node by Position

The Java for XML Direct Mapping to Text Node by Position example shows how to configure this mapping in Java. Again, for more complex XML path customization, EclipseLink's @XmlPath annotation is used.

Java for XML Direct Mapping to Text Node by Position

@XmlRootElement
public class Customer {
   @XmlPath("name[1]/text()")
   public String firstName;
   @XmlPath("name[2]/text()")
   public String lastName;
}

The OXM for XML Direct Mapping to Text Node by Position example shows how to to define your mapping information in EclipseLink's OXM metadata format.

OXM for XML Direct Mapping to Text Node by Position

...
<java-type name="Customer">
   <xml-root-element name="customer"/>
   <java-attributes>
      <xml-element java-attribute="firstName" xml-path="name[1]/text()"/>
      <xml-element java-attribute="lastName" xml-path="name[2]/text()"/>
   </java-attributes>
</java-type>
...



Mapping to a Simple Text Node

Given the XML schema in the Schema for XML Direct Mapping to Simple Text Node example, the XML Direct Mapping to Simple Text Node figure illustrates an XML direct mapping to a simple text node in a corresponding XML document.

Schema for XML Direct Mapping to Simple Text Node

<?xml version="1.0" encoding="UTF-8"?>
<xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema">
 
   <xsd:element name="phone-number" type="xsd:string"/>
 
</xsd:schema>

XML Direct Mapping to Simple Text Node

XML Direct Mapping to Simple Text Node

The Java for XML Direct Mapping to Simple Text Node example shows how to annotate your Java class to obtain this mapping with EclipseLink. In this case, the @XmlValue annotation will be used.

Java for XML Direct Mapping to Simple Text Node

@XmlRootElement(name="phone-number")
public class PhoneNumber {
   @XmlValue
   public String number;
}

The OXM for XML Direct Mapping to Simple Text Node example shows how to to define your mapping information in EclipseLink's OXM metadata format.

OXM for XML Direct Mapping to Simple Text Node

...
<java-type name="PhoneNumber">
   <xml-root-element name="phone-number"/>
   <java-attributes>
      <xml-value java-attribute="number"/>
   </java-attributes>
</java-type>
...



Mapping to a Specified Schema Type

In most cases, EclipseLink can determine the target format in the XML document. However, there are cases where you must specify which one of a number of possible targets EclipseLink should use. For example, a java.util.Calendar could be marshalled to a schema date, time, or dateTime node, or a byte[] could be marshalled to a schema hexBinary or base64Binary node.

The following XML schema and figure illustrate an XML direct mapping from a Calendar object in Java to a date field in XML.

Example Schema

<?xml version="1.0" encoding="UTF-8"?>
<xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema">
 
   <xsd:element name="customer" type="customer-type"/>
 
   <xsd:complexType name="customer-type">
      <xsd:sequence>
         <xsd:element name="hire-date" type="xsd:date"/>
      </xsd:sequence>
   </xsd:complexType>
 
</xsd:schema>

Object Model and Example XML Document

Schematypedate.png

The example below shows how to annotate your Java class to obtain this mapping with EclipseLink. Here, the @XmlSchemaType is used to specify the datatype that will appear in the marshalled XML.

Java Annotations

@XmlRootElement
public class Customer {
   @XmlElement(name="hire-date")
   @XmlSchemaType(name="date")
   public Calendar hireDate;
}

The following example shows how to to define your mapping information in EclipseLink's OXM metadata format.

EclipseLink OXM Metadata

...
<java-type name="Customer">
   <xml-root-element name="customer"/>
   <java-attributes>
      <xml-element java-attribute="hireDate" name="hire-date">
         <xml-schema-type name="date"/>
      </xml-element>
   </java-attributes>
</java-type>
...



Using Java Type Adapters

The next example schema and figure illustrate XML direct mappings to two different text nodes of different binary types.

Example Schema

<?xml version="1.0" encoding="UTF-8"?>
<xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema">
 
   <xsd:element name="customer" type="customer-type"/>
 
   <xsd:complexType name="customer-type">
      <xsd:sequence>
         <xsd:element name="resume" type="xsd:base64Binary"/>
         <xsd:element name="picture" type="xsd:hexBinary"/>
      </xsd:sequence>
   </xsd:complexType>
 
</xsd:schema>

Object Model and Example XML Document

XML Direct Mapping to a Specified Schema Type

The example below shows how to annotate your Java class to obtain this mapping with EclipseLink. By default, JAXB will marshall byte[] to base64Binary, so nothing special is needed for the resume mapping. To map to a hexBinary field, the @XmlSchemaType annotation specifies the XML type, while @XmlJavaTypeAdapter specifies the adapter class that will be responsible for converting the value (in this case, the built-in JAXB HexBinaryAdapter).

Java Annotations

@XmlRootElement
public class Customer {
   @XmlElement
   public byte[] resume;
   @XmlElement
   @XmlSchemaType(name="hexBinary")
   @XmlJavaTypeAdapter(HexBinaryAdapter.class)
   public byte[] picture;
}

The following example shows how to to define your mapping information in EclipseLink's OXM metadata format.

EclipseLink OXM Metadata

...
<java-type name="Customer">
   <xml-root-element name="customer"/>
   <java-attributes>
      <xml-element java-attribute="resume"/>
      <xml-element java-attribute="picture">
         <xml-schema-type name="hexBinary"/>
         <xml-java-type-adapter value="javax.xml.bind.annotation.adapters.HexBinaryAdapter"/>
      </xml-element>
   </java-attributes>
</java-type>
...



Mapping with a Simple Type Translator

If the type of a node is not defined in your XML schema, you can configure an XML direct mapping to use the xsi:type attribute to provide type information.

Given the XML schema fragment in the Schema for XML Direct Mapping with Simple Type Translator example, the Java Class for XML Direct Mapping with Simple Type Translator figure illustrates a Java class that can be mapped to a corresponding XML document.

Schema for XML Direct Mapping with Simple Type Translator

<?xml version="1.0" encoding="UTF-8"?>
<xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema">
 
   <xsd:element name="phone-number" type="phone-number-type"/>
 
   <xsd:complexType name="phone-number-type">
      <xsd:sequence>
         <xsd:element name="area-code" type="anySimpleType"/>
         <xsd:element name="number" type="anySimpleType"/>
      </xsd:sequence>
   </xsd:complexType>
 
</xsd:schema>

Java Class for XML Direct Mapping with Simple Type Translator

Java Class for XML Direct Mapping with Simple Type Translator

The following figure illustrates an XML direct mapping with a simple type translator in an XML document that conforms to the schema in the Schema for XML Direct Mapping with Simple Type Translator example.

XML Direct Mapping with a Simple Type Translator

XML Direct Mapping with a Simple Type Translator

The Java for XML Direct Mapping with Simple Type Translator example shows shows how to annotate your Java class to obtain this mapping with EclipseLink.

Java for XML Direct Mapping with Simple Type Translator

@XmlRootElement(name="phone-number")
public class PhoneNumber {
   @XmlElement(name="area-code")
   public Object areaCode;
   @XmlElement
   public Object number;
}

The OXM for XML Direct Mapping with Simple Type Translator example shows how to to define your mapping information in EclipseLink's OXM metadata format.

OXM for XML Direct Mapping with Simple Type Translator

...
<java-type name="PhoneNumber">
   <xml-root-element name="phone-number"/>
   <java-attributes>
      <xml-element java-attribute="areaCode" name="area-code"/>
      <xml-element java-attribute="number"/>
   </java-attributes>
</java-type>
...

For more information, see Simple Type Translator.



Mapping to a Union Field with an XML Direct Mapping

Given the XML schema in the Schema for XML Direct Mapping to a Union Field example, the Java Class for XML Direct Mapping to a Union Field figure illustrates a Java class that can be mapped to a corresponding XML document. Note the shoeSize attribute in this class: when using a union field, the corresponding attribute must be able to store all possible values.

Schema for XML Direct Mapping to Union of Lists

<?xml version="1.0" encoding="UTF-8"?>
<xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema">
  <xsd:element name="customer" type="customer-type"/>
     <xsd:complexType name="customer-type">
     <xsd:sequence>
           <xsd:element name="shoe-size" type="size-type"/>
      </xsd:sequence>
  </xsd:complexType>
  <xsd:simpleType name="size-type">
     <xsd:union memberTypes="xsd:decimal xsd:string"/>
  </xsd:simpleType>
</xsd:schema>


Java Class for XML Direct Mapping to a Union Field

Java Class for XML Direct Mapping to a Union Field

The XML Direct Mapping to the First Valid Union Type figure illustrates an XML direct mapping to a union field in an XML document that conforms to the schema in the Schema for XML Direct Mapping to a Union Field example. When EclipseLink unmarshalls the XML document, it tries each of the union types until it can make a successful conversion. The first schema type in the union is xsd:decimal. Because "10.5" is a valid decimal, EclipseLink converts the value to the appropriate type. If the Object attribute is specific enough to trigger an appropriate value, EclipseLink will use that type instead. Otherwise, EclipseLink uses a default (in this case BigDecimal). You can override this behavior in Java code.

XML Direct Mapping to the First Valid Union Type

XML Direct Mapping to the First Valid Union Type

The XML Direct Mapping to Another Valid Union Type figure illustrates an XML direct mapping to union field in another XML document that conforms to the schema in Schema for XML Direct Mapping to a Union Field. In this document, the value "M" is not a valid xsd:decimal type so the next union type is tried. The next union type is xsd:string and a conversion can be done.

XML Direct Mapping to Another Valid Union Type

XML Direct Mapping to Another Valid Union Type

This example shows how to configure this mapping in Java.

Java for XML Direct Mapping to a Union Type

XMLDirectMapping shoeSizeMapping = new XMLDirectMapping();
shoeSizeMapping.setAttributeName("shoeSize");
XMLUnionField shoeSizeField = new XMLUnionField();
shoeSizeField.setXPath("shoe-size/text()");
shoeSizeField.addSchemaType(XMLConstants.DECIMAL_QNAME);
shoeSizeField.addSchemaType(XMLConstants.STRING_QNAME);
shoeSizeMapping.setField(shoeSizeField);

To override the default conversion, use the XMLUnionField method addConversion:

shoeSizeField.addConversion(XMLConstants.DECIMAL_QNAME, Float.class);

Mapping to a Union of Lists with an XML Direct Mapping

Given the XML schema in Schema for XML Direct Mapping to Union of Lists, the XML Direct Mapping to Union of Lists figure illustrates an XML direct mapping to a union of lists in a corresponding XML document. The Java for XML Direct Mapping to Union of Lists example shows how to configure this mapping in Java.


Schema for XML Direct Mapping to Union of Lists

<?xml version="1.0" encoding="UTF-8"?>
<xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema">

    <xsd:element name="vacation" type="unionOfLists"/>
    <xsd:simpleType name="unionOfLists">
        <xsd:union memberTypes="xsd:double">
            <xsd:simpleType>
                <xsd:list itemType="xsd:date"/>
            </xsd:simpleType>

            <xsd:simpleType>
                <xsd:list itemType="xsd:integer"/>
            </xsd:simpleType>
        </xsd:union>
    </xsd:simpleType>
</xsd:schema>


XML Direct Mapping to Union of Lists

XML Direct Mapping to Union of Lists

Note that in this example, valid XML documents contain either all xsd:double, all xsd:date, or all xsd:integer values.


Java for XML Direct Mapping to Union of Lists

XMLDirectMapping mapping = new XMLDirectMapping();
mapping.setAttributeName("vacation");
mapping.setXPath("UnionOfLists/text()");

Mapping to a Union of Unions with an XML Direct Mapping

Given the XML schema in the Schema for XML Direct Mapping to a Union of Unions example, the Java Class for XML Direct Mapping to a Union of Unions figure illustrates a Java class that can be mapped to a corresponding XML document. The Java for XML Direct Mapping to a Union of Unions example shows how to configure this mapping in Java.


Schema for XML Direct Mapping to a Union of Unions

<?xml version="1.0" encoding="UTF-8"?>
<xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema">
    <xsd:element name="vacation" type="unionOfUnions"/>
    <xsd:simpleType name="unionOfUnions">
        <xsd:union>

            <xsd:simpleType>
                <xsd:union>
                    <xsd:simpleType>
                        <xsd:list itemType="xsd:date"/>
                    </xsd:simpleType>
                    <xsd:simpleType>

                        <xsd:list itemType="xsd:integer"/>
                    </xsd:simpleType>
                </xsd:union>
            </xsd:simpleType>
            <xsd:simpleType>
                <xsd:union>

                    <xsd:simpleType>
                        <xsd:list itemType="xsd:string"/>
                    </xsd:simpleType>
                    <xsd:simpleType>
                        <xsd:list itemType="xsd:float"/>
                    </xsd:simpleType>

                </xsd:union>
            </xsd:simpleType>
        </xsd:union>
    </xsd:simpleType>
</xsd:schema>


Java Class for XML Direct Mapping to a Union of Unions

Java Class for XML Direct Mapping to a Union of Unions


Java for XML Direct Mapping to a Union of Unions

XMLDirectMapping vacationMapping = new XMLDirectMapping();
vacationMapping.setAttributeName("vacation");
XMLUnionField vacationField = new XMLUnionField();
vacationField.setXPath("vacation/text()");
vacationField.addSchemaType(XMLConstants.DATE_QNAME);
vacationField.addSchemaType(XMLConstants.INTEGER_QNAME);
vacationField.addSchemaType(XMLConstants.STRING_QNAME);
vacationField.addSchemaType(XMLConstants.FLOAT_QNAME);
vacationMapping.setField(vacationField);


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