Class JAXBElement<T>

java.lang.Object
jakarta.xml.bind.JAXBElement<T>
All Implemented Interfaces:
Serializable

public class JAXBElement<T> extends Object implements Serializable

Jakarta XML Binding representation of an Xml Element.

This class represents information about an Xml Element from both the element declaration within a schema and the element instance value within an xml document with the following properties

  • element's xml tag name
  • value represents the element instance's atttribute(s) and content model
  • element declaration's declaredType (xs:element @type attribute)
  • scope of element declaration
  • boolean nil property. (element instance's xsi:nil attribute)

The declaredType and scope property are the Jakarta XML Binding class binding for the xml type definition.

Scope is either JAXBElement.GlobalScope or the Java class representing the complex type definition containing the schema element declaration.

There is a property constraint that if value is null, then nil must be true. The converse is not true to enable representing a nil element with attribute(s). If nil is true, it is possible that value is non-null so it can hold the value of the attributes associated with a nil element.

Since:
1.6, JAXB 2.0
See Also:
  • Nested Class Summary

    Nested Classes
    Modifier and Type
    Class
    Description
    static final class 
    Designates global scope for an xml element.
  • Field Summary

    Fields
    Modifier and Type
    Field
    Description
    protected final Class<T>
    Java datatype binding for xml element declaration's type.
    protected final QName
    xml element tag name
    protected boolean
    true iff the xml element instance has xsi:nil="true".
    protected final Class
    Scope of xml element declaration representing this xml element instance.
    protected T
    xml element value.
  • Constructor Summary

    Constructors
    Constructor
    Description
    JAXBElement(QName name, Class<T> declaredType, Class scope, T value)
    Construct an xml element instance.
    JAXBElement(QName name, Class<T> declaredType, T value)
    Construct an xml element instance.
  • Method Summary

    Modifier and Type
    Method
    Description
    Returns the Java binding of the xml element declaration's type attribute.
    Returns the xml element tag name.
    Returns scope of xml element declaration.
    Return the content model and attribute values for this element.
    boolean
    Returns true iff this xml element declaration is global.
    boolean
    Returns true iff this element instance content model is nil.
    boolean
    Returns true iff this xml element instance's value has a different type than xml element declaration's declared type.
    void
    setNil(boolean value)
    Set whether this element has nil content.
    void
    Set the content model and attributes of this xml element.

    Methods inherited from class java.lang.Object

    clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
  • Field Details

    • name

      protected final QName name
      xml element tag name
    • declaredType

      protected final Class<T> declaredType
      Java datatype binding for xml element declaration's type.
    • scope

      protected final Class scope
      Scope of xml element declaration representing this xml element instance. Can be one of the following values: - JAXBElement.GlobalScope for global xml element declaration. - local element declaration has a scope set to the Java class representation of complex type defintion containing xml element declaration.
    • value

      protected T value
      xml element value. Represents content model and attributes of an xml element instance.
    • nil

      protected boolean nil
      true iff the xml element instance has xsi:nil="true".
  • Constructor Details

    • JAXBElement

      public JAXBElement(QName name, Class<T> declaredType, Class scope, T value)

      Construct an xml element instance.

      Parameters:
      name - Java binding of xml element tag name
      declaredType - Java binding of xml element declaration's type
      scope - Java binding of scope of xml element declaration. Passing null is the same as passing GlobalScope.class
      value - Java instance representing xml element's value.
      See Also:
    • JAXBElement

      public JAXBElement(QName name, Class<T> declaredType, T value)
      Construct an xml element instance. This is just a convenience method for new JAXBElement(name,declaredType,GlobalScope.class,value)
  • Method Details

    • getDeclaredType

      public Class<T> getDeclaredType()
      Returns the Java binding of the xml element declaration's type attribute.
    • getName

      public QName getName()
      Returns the xml element tag name.
    • setValue

      public void setValue(T t)

      Set the content model and attributes of this xml element.

      When this property is set to null, isNil() must by true. Details of constraint are described at isNil().

      See Also:
    • getValue

      public T getValue()

      Return the content model and attribute values for this element.

      See isNil() for a description of a property constraint when this value is null

    • getScope

      public Class getScope()
      Returns scope of xml element declaration.
      Returns:
      GlobalScope.class if this element is of global scope.
      See Also:
    • isNil

      public boolean isNil()

      Returns true iff this element instance content model is nil.

      This property always returns true when getValue() is null. Note that the converse is not true, when this property is true, getValue() can contain a non-null value for attribute(s). It is valid for a nil xml element to have attribute(s).

    • setNil

      public void setNil(boolean value)

      Set whether this element has nil content.

      See Also:
    • isGlobalScope

      public boolean isGlobalScope()
      Returns true iff this xml element declaration is global.
    • isTypeSubstituted

      public boolean isTypeSubstituted()
      Returns true iff this xml element instance's value has a different type than xml element declaration's declared type.