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XmlAttribute.java
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XmlAttribute.java
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/*
* Copyright (c) 2004, 2024 Oracle and/or its affiliates. All rights reserved.
*
* This program and the accompanying materials are made available under the
* terms of the Eclipse Distribution License v. 1.0, which is available at
* http://www.eclipse.org/org/documents/edl-v10.php.
*
* SPDX-License-Identifier: BSD-3-Clause
*/
package jakarta.xml.bind.annotation;
import java.lang.annotation.Retention;
import java.lang.annotation.Target;
import static java.lang.annotation.ElementType.*;
import static java.lang.annotation.RetentionPolicy.*;
/**
* <p>
* Maps a JavaBean property to an XML attribute.
*
* <p> <b>Usage</b> </p>
* <p>
* The {@code @XmlAttribute} annotation can be used with the
* following program elements:
* <ul>
* <li> JavaBean property </li>
* <li> field </li>
* </ul>
*
* <p> A static final field is mapped to an XML fixed attribute.
*
* <p>See "Package Specification" in jakarta.xml.bind.package javadoc for
* additional common information.</p>
*
* The usage is subject to the following constraints:
* <ul>
* <li> If type of the field or the property is a collection
* type, then the collection item type must be mapped to schema
* simple type.
* {@snippet :
* // Examples
* @XmlAttribute List<Integer> items; //legal
* @XmlAttribute List<Bar> foo; // illegal if Bar does not map to a schema simple type
* }
* </li>
* <li> 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.
* {@snippet :
* // Examples
* @XmlAttribute int foo; // legal
* @XmlAttribute Foo foo; // illegal if Foo does not map to a schema simple type
* }
* </li>
* <li> This annotation can be used with the following annotations:
* {@link XmlID},
* {@link XmlIDREF},
* {@link XmlList},
* {@link XmlSchemaType},
* {@link XmlValue},
* {@link XmlAttachmentRef},
* {@link XmlMimeType},
* {@link XmlInlineBinaryData},
* {@link jakarta.xml.bind.annotation.adapters.XmlJavaTypeAdapter}.</li>
* </ul>
*
* <p> <b>Example 1: </b>Map a JavaBean property to an XML attribute.</p>
* {@snippet :
* //Example: Code fragment
* public class USPrice {
* @XmlAttribute
* public java.math.BigDecimal getPrice() {...} ;
* public void setPrice(java.math.BigDecimal ) {...};
* }
* }
* {@snippet lang="XML" :
* <!-- Example: XML Schema fragment -->
* <xs:complexType name="USPrice">
* <xs:sequence>
* </xs:sequence>
* <xs:attribute name="price" type="xs:decimal"/>
* </xs:complexType>
* }
*
* <p> <b>Example 2: </b>Map a JavaBean property to an XML attribute with anonymous type.</p>
* See Example 7 in @{@link XmlType}.
*
* <p> <b>Example 3: </b>Map a JavaBean collection property to an XML attribute.</p>
* {@snippet :
* // Example: Code fragment
* class Foo {
* ...
* @XmlAttribute
* List<Integer> items;
* }
* }
* {@snippet lang="XML" :
* <!-- Example: XML Schema fragment -->
* <xs:complexType name="foo">
* ...
* <xs:attribute name="items">
* <xs:simpleType>
* <xs:list itemType="xs:int"/>
* </xs:simpleType>
</xs:attribute>
* </xs:complexType>
* }
* @author Sekhar Vajjhala, Sun Microsystems, Inc.
* @see XmlType
* @since 1.6, JAXB 2.0
*/
@Retention(RUNTIME) @Target({FIELD, METHOD})
public @interface XmlAttribute {
/**
* Name of the XML Schema attribute. By default, the XML Schema
* attribute name is derived from the JavaBean property name.
*
*/
String name() default "##default";
/**
* Specifies if the XML Schema attribute is optional or
* required. If true, then the JavaBean property is mapped to
* an XML Schema attribute that is required. Otherwise, it is mapped
* to an XML Schema attribute that is optional.
*
*/
boolean required() default false;
/**
* Specifies the XML target namespace of the XML Schema
* attribute.
*
*/
String namespace() default "##default" ;
}