XmlAttribute (Java Platform SE 6) - JDK 5 Documentation v6.0, Java 2 SDK 英文文档

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Java™ Platform
Standard Ed. 6

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SUMMARY: REQUIRED | OPTIONAL

DETAIL: ELEMENT

javax.xml.bind.annotation
Annotation Type XmlAttribute

@Retention(value=RUNTIME) @Target(value={FIELD,METHOD}) public @interface XmlAttribute

Maps a JavaBean property to a XML attribute.

Usage

The @XmlAttribute annotation can be used with the following program elements:

JavaBean property
field

A static final field is mapped to a XML fixed attribute.

See "Package Specification" in javax.xml.bind.package javadoc for additional common information.

The usage is subject to the following constraints:

If type of the field or the property is a collection type, then the collection item type must be mapped to schema simple type.

     // Examples
     @XmlAttribute List<Integer> items; //legal
     @XmlAttribute List<Bar> foo; // illegal if Bar does not map to a schema simple type

If the type of the field or the property is a non collection type, then the type of the property or field must map to a simple schema type.
```
     // Examples
     @XmlAttribute int foo; // legal
     @XmlAttribute Foo foo; // illegal if Foo does not map to a schema simple type
 
```
This annotation can be used with the following annotations: XmlID, XmlIDREF, XmlList, XmlSchemaType, XmlValue, XmlAttachmentRef, XmlMimeType, XmlInlineBinaryData, XmlJavaTypeAdapter

Example 1: Map a JavaBean property to an XML attribute.

     //Example: Code fragment
     public class USPrice { 
         @XmlAttribute
         public java.math.BigDecimal getPrice() {...} ;
         public void setPrice(java.math.BigDecimal ) {...};
     }

     <!-- Example: XML Schema fragment -->
     <xs:complexType name="USPrice">
       <xs:sequence>
       </xs:sequence>
       <xs:attribute name="price" type="xs:decimal"/>
     </xs:complexType>

Example 2: Map a JavaBean property to an XML attribute with anonymous type.

See Example 7 in @XmlType.

Example 3: Map a JavaBean collection property to an XML attribute.

     // Example: Code fragment
     class Foo {
         ...
         @XmlAttribute List<Integer> items;
     } 

     <!-- Example: XML Schema fragment -->
     <xs:complexType name="foo">
         ...
       <xs:attribute name="items">
         <xs:simpleType>
           <xs:list itemType="xs:int"/>
         </xs:simpleType>
     </xs:complexType>

Since:: JAXB2.0
See Also:: XmlType

Optional Element Summary

String name
          Name of the XML Schema attribute.

String namespace
          Specifies the XML target namespace of the XML Schema attribute.

boolean required
          Specifies if the XML Schema attribute is optional or required.

Optional Element Summary
`String`	`name` Name of the XML Schema attribute.
`String`	`namespace` Specifies the XML target namespace of the XML Schema attribute.
`boolean`	`required` Specifies if the XML Schema attribute is optional or required.

name

public abstract String name

Name of the XML Schema attribute. By default, the XML Schema attribute name is derived from the JavaBean property name.

Default:: "##default"

required

public abstract boolean required

Specifies if the XML Schema attribute is optional or required. If true, then the JavaBean property is mapped to a XML Schema attribute that is required. Otherwise it is mapped to a XML Schema attribute that is optional.

Default:: false

namespace

public abstract String namespace

Specifies the XML target namespace of the XML Schema attribute.

Default:: "##default"