/*
* Copyright 2004 Sun Microsystems, Inc. All rights reserved.
* SUN PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
*/
package javax.xml.bind.annotation;
import javax.xml.bind.annotation.adapters.XmlJavaTypeAdapter;
import java.lang.annotation.Retention;
import java.lang.annotation.Target;
import static java.lang.annotation.ElementType.*;
import static java.lang.annotation.ElementType.PARAMETER;
import static java.lang.annotation.RetentionPolicy.*;
/**
* Maps a JavaBean property to a XML element derived from property name.
*
* <p> <b>Usage</b> </p>
* <p>
* </tt>@XmlElement</tt> annotation can be used with the following program
* elements:
* <ul>
* <li> a JavaBean property </li>
* <li> non static, non transient field </li>
* <li> within {@link XmlElements}
* <p>
*
* </ul>
*
* The usage is subject to the following constraints:
* <ul>
* <li> This annotation can be used with following annotations:
* {@link XmlID},
* {@link XmlIDREF},
* {@link XmlList},
* {@link XmlSchemaType},
* {@link XmlValue},
* {@link XmlAttachmentRef},
* {@link XmlMimeType},
* {@link XmlInlineBinaryData},
* {@link XmlElementWrapper},
* {@link XmlJavaTypeAdapter}</li>
* <li> if the type of JavaBean property is a collection type of
* array, an indexed property, or a parameterized list, and
* this annotation is used with {@link XmlElements} then,
* <tt>@XmlElement.type()</tt> must be DEFAULT.class since the
* collection item type is already known. </li>
* </ul>
*
* <p>
* A JavaBean property, when annotated with @XmlElement annotation
* is mapped to a local element in the XML Schema complex type to
* which the containing class is mapped.
*
* <p>
* <b>Example 1: </b> Map a public non static non final field to local
* element
* <pre>
* //Example: Code fragment
* public class USPrice {
* @XmlElement(name="itemprice")
* public java.math.BigDecimal price;
* }
*
* <!-- Example: Local XML Schema element -->
* <xs:complexType name="USPrice"/>
* <xs:sequence>
* <xs:element name="itemprice" type="xs:decimal" minOccurs="0"/>
* </sequence>
* </xs:complexType>
* </pre>
* <p>
*
* <b> Example 2: </b> Map a field to a nillable element.
* <pre>
*
* //Example: Code fragment
* public class USPrice {
* @XmlElement(nillable=true)
* public java.math.BigDecimal price;
* }
*
* <!-- Example: Local XML Schema element -->
* <xs:complexType name="USPrice">
* <xs:sequence>
* <xs:element name="price" type="xs:decimal" nillable="true" minOccurs="0"/>
* </sequence>
* </xs:complexType>
* </pre>
* <p>
* <b> Example 3: </b> Map a field to a nillable, required element.
* <pre>
*
* //Example: Code fragment
* public class USPrice {
* @XmlElement(nillable=true, required=true)
* public java.math.BigDecimal price;
* }
*
* <!-- Example: Local XML Schema element -->
* <xs:complexType name="USPrice">
* <xs:sequence>
* <xs:element name="price" type="xs:decimal" nillable="true" minOccurs="1"/>
* </sequence>
* </xs:complexType>
* </pre>
* <p>
*
* <p> <b>Example 4: </b>Map a JavaBean property to an XML element
* with anonymous type.</p>
* <p>
* See Example 6 in @{@link XmlType}.
*
* <p>
* @author Sekhar Vajjhala, Sun Microsystems, Inc.
* @since JAXB2.0
*/
@Retention(RUNTIME) @Target({FIELD, METHOD, PARAMETER})
public @interface XmlElement {
/**
* Name of the XML Schema element.
* <p> If the value is "##default", then element name is derived from the
* JavaBean property name.
*/
String name() default "##default";
/**
* Customize the element declaration to be nillable.
* <p>If nillable() is true, then the JavaBean property is
* mapped to a XML Schema nillable element declaration.
*/
boolean nillable() default false;
/**
* Customize the element declaration to be required.
* <p>If required() is true, then Javabean property is mapped to
* an XML schema element declaration with minOccurs="1".
* maxOccurs is "1" for a single valued property and "unbounded"
* for a multivalued property.
* <p>If required() is false, then the Javabean property is mapped
* to XML Schema element declaration with minOccurs="0".
* maxOccurs is "1" for a single valued property and "unbounded"
* for a multivalued property.
*/
boolean required() default false;
/**
* XML target namespace of the XML Schema element.
* <p>
* If the value is "##default", then the namespace is determined
* as follows:
* <ol>
* <li>
* If the enclosing package has {@link XmlSchema} annotation,
* and its {@link XmlSchema#elementFormDefault() elementFormDefault}
* is {@link XmlNsForm#QUALIFIED QUALIFIED}, then the namespace of
* the enclosing class.
*
* <li>
* Otherwise "" (which produces unqualified element in the default
* namespace.
* </ol>
*/
String namespace() default "##default";
/**
* Default value of this element.
*
* <p>
* The '\u0000' value specified as a default of this annotation element
* is used as a poor-man's substitute for null to allow implementations
* to recognize the 'no default value' state.
*/
String defaultValue() default "\u0000";
/**
* The Java class being referenced.
*/
Class type() default DEFAULT.class;
/**
* Used in {@link XmlElement#type()} to
* signal that the type be inferred from the signature
* of the property.
*/
static final class DEFAULT {}
}
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