Unmarshaller (Java Platform SE 6)

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javax.xml.bind
interface Unmarshaller

All Known Implementing Classes:: AbstractUnmarshallerImpl

Most common way to construct:

JAXBContext jc = …;

Unmarshaller u = jc.createUnmarshaller();

Based on 440 examples

public interface Unmarshaller

The Unmarshaller class governs the process of deserializing XML data into newly created Java content trees, optionally validating the XML data as it is unmarshalled. It provides an overloading of unmarshal methods for many different input kinds.

Unmarshalling from a File:

       JAXBContext jc = JAXBContext.newInstance( "com.acme.foo" );
       Unmarshaller u = jc.createUnmarshaller();
       Object o = u.unmarshal( new File( "nosferatu.xml" ) );

Unmarshalling from an InputStream:

       InputStream is = new FileInputStream( "nosferatu.xml" );
       JAXBContext jc = JAXBContext.newInstance( "com.acme.foo" );
       Unmarshaller u = jc.createUnmarshaller();
       Object o = u.unmarshal( is );

Unmarshalling from a URL:

       JAXBContext jc = JAXBContext.newInstance( "com.acme.foo" );
       Unmarshaller u = jc.createUnmarshaller();
       URL url = new URL( "http://beaker.east/nosferatu.xml" );
       Object o = u.unmarshal( url );

Unmarshalling from a StringBuffer using a javax.xml.transform.stream.StreamSource:

       JAXBContext jc = JAXBContext.newInstance( "com.acme.foo" );
       Unmarshaller u = jc.createUnmarshaller();
       StringBuffer xmlStr = new StringBuffer( "<?xml version="1.0"?>..." );
       Object o = u.unmarshal( new StreamSource( new StringReader( xmlStr.toString() ) ) );

Unmarshalling from a org.w3c.dom.Node:

       JAXBContext jc = JAXBContext.newInstance( "com.acme.foo" );
       Unmarshaller u = jc.createUnmarshaller();
 
       DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
       dbf.setNamespaceAware(true);
       DocumentBuilder db = dbf.newDocumentBuilder();
       Document doc = db.parse(new File( "nosferatu.xml"));

       Object o = u.unmarshal( doc );

Unmarshalling from a javax.xml.transform.sax.SAXSource using a client specified validating SAX2.0 parser:

       // configure a validating SAX2.0 parser (Xerces2)
       static final String JAXP_SCHEMA_LANGUAGE =
           "http://java.sun.com/xml/jaxp/properties/schemaLanguage";
       static final String JAXP_SCHEMA_LOCATION =
           "http://java.sun.com/xml/jaxp/properties/schemaSource";
       static final String W3C_XML_SCHEMA =
           "http://www.w3.org/2001/XMLSchema";

       System.setProperty( "javax.xml.parsers.SAXParserFactory",
                           "org.apache.xerces.jaxp.SAXParserFactoryImpl" );

       SAXParserFactory spf = SAXParserFactory.newInstance();
       spf.setNamespaceAware(true);
       spf.setValidating(true);
       SAXParser saxParser = spf.newSAXParser();
       
       try {
           saxParser.setProperty(JAXP_SCHEMA_LANGUAGE, W3C_XML_SCHEMA);
           saxParser.setProperty(JAXP_SCHEMA_LOCATION, "http://....");
       } catch (SAXNotRecognizedException x) {
           // exception handling omitted
       }

       XMLReader xmlReader = saxParser.getXMLReader();
       SAXSource source = 
           new SAXSource( xmlReader, new InputSource( "http://..." ) );

       // Setup JAXB to unmarshal
       JAXBContext jc = JAXBContext.newInstance( "com.acme.foo" );
       Unmarshaller u = jc.createUnmarshaller();
       ValidationEventCollector vec = new ValidationEventCollector();
       u.setEventHandler( vec );
       
       // turn off the JAXB provider's default validation mechanism to 
       // avoid duplicate validation
       u.setValidating( false )

       // unmarshal
       Object o = u.unmarshal( source );

       // check for events
       if( vec.hasEvents() ) {
          // iterate over events
       }

Unmarshalling from a StAX XMLStreamReader:

       JAXBContext jc = JAXBContext.newInstance( "com.acme.foo" );
       Unmarshaller u = jc.createUnmarshaller();
 
       javax.xml.stream.XMLStreamReader xmlStreamReader = 
           javax.xml.stream.XMLInputFactory().newInstance().createXMLStreamReader( ... );
 
       Object o = u.unmarshal( xmlStreamReader );

Unmarshalling from a StAX XMLEventReader:

       JAXBContext jc = JAXBContext.newInstance( "com.acme.foo" );
       Unmarshaller u = jc.createUnmarshaller();
 
       javax.xml.stream.XMLEventReader xmlEventReader = 
           javax.xml.stream.XMLInputFactory().newInstance().createXMLEventReader( ... );
 
       Object o = u.unmarshal( xmlEventReader );

Unmarshalling XML Data

Unmarshalling can deserialize XML data that represents either an entire XML document or a subtree of an XML document. Typically, it is sufficient to use the unmarshalling methods described by Unmarshal root element that is declared globally. These unmarshal methods utilize {@link JAXBContext}'s mapping of global XML element declarations and type definitions to JAXB mapped classes to initiate the unmarshalling of the root element of XML data. When the {@link JAXBContext}'s mappings are not sufficient to unmarshal the root element of XML data, the application can assist the unmarshalling process by using the unmarshal by declaredType methods. These methods are useful for unmarshalling XML data where the root element corresponds to a local element declaration in the schema.

An unmarshal method never returns null. If the unmarshal process is unable to unmarshal the root of XML content to a JAXB mapped object, a fatal error is reported that terminates processing by throwing JAXBException.

Unmarshal a root element that is globally declared

The unmarshal methods that do not have an declaredType parameter use {@link JAXBContext} to unmarshal the root element of an XML data. The {@link JAXBContext} instance is the one that was used to create this Unmarshaller. The {@link JAXBContext} instance maintains a mapping of globally declared XML element and type definition names to JAXB mapped classes. The unmarshal method checks if {@link JAXBContext} has a mapping from the root element's XML name and/or @xsi:type to a JAXB mapped class. If it does, it umarshalls the XML data using the appropriate JAXB mapped class. Note that when the root element name is unknown and the root element has an @xsi:type, the XML data is unmarshalled using that JAXB mapped class as the value of a {@link JAXBElement}. When the {@link JAXBContext} object does not have a mapping for the root element's name nor its @xsi:type, if it exists, then the unmarshal operation will abort immediately by throwing a {@link UnmarshalException UnmarshalException}. This exception scenario can be worked around by using the unmarshal by declaredType methods described in the next subsection.

Unmarshal by Declared Type

The unmarshal methods with a declaredType parameter enable an application to deserialize a root element of XML data, even when there is no mapping in {@link JAXBContext} of the root element's XML name. The unmarshaller unmarshals the root element using the application provided mapping specified as the declaredType parameter. Note that even when the root element's element name is mapped by {@link JAXBContext}, the declaredType parameter overrides that mapping for deserializing the root element when using these unmarshal methods. Additionally, when the root element of XML data has an xsi:type attribute and that attribute's value references a type definition that is mapped to a JAXB mapped class by {@link JAXBContext}, that the root element's xsi:type attribute takes precedence over the unmarshal methods declaredType parameter. These methods always return a JAXBElement<declaredType> instance. The table below shows how the properties of the returned JAXBElement instance are set.

Unmarshal By Declared Type returned JAXBElement

JAXBElement Property Value

name xml element name

value instanceof declaredType

declaredType unmarshal method declaredType parameter

scope null (actual scope is unknown)

Unmarshal By Declared Type returned JAXBElement
value	`instanceof declaredType`
declaredType	unmarshal method `declaredType` parameter
scope	`null` (actual scope is unknown)

The following is an example of unmarshal by declaredType method.

Unmarshal by declaredType from a org.w3c.dom.Node:

       Schema fragment for example
       <xs:schema>
          <xs:complexType name="FooType">...<\xs:complexType>
          <!-- global element declaration "PurchaseOrder" -->
          <xs:element name="PurchaseOrder">
              <xs:complexType>
                 <xs:sequence>
                    <!-- local element declaration "foo" -->
                    <xs:element name="foo" type="FooType"/>
                    ...
                 </xs:sequence>
              </xs:complexType>
          </xs:element>
       </xs:schema>

       JAXBContext jc = JAXBContext.newInstance( "com.acme.foo" );
       Unmarshaller u = jc.createUnmarshaller();
 
       DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
       dbf.setNamespaceAware(true);
       DocumentBuilder db = dbf.newDocumentBuilder();
       Document doc = db.parse(new File( "nosferatu.xml"));
       Element  fooSubtree = ...; // traverse DOM till reach xml element foo, constrained by a 
                                  // local element declaration in schema.
 
       // FooType is the JAXB mapping of the type of local element declaration foo.
       JAXBElement<FooType> foo = u.unmarshal( fooSubtree, FooType.class);

Support for SAX2.0 Compliant Parsers

A client application has the ability to select the SAX2.0 compliant parser of their choice. If a SAX parser is not selected, then the JAXB Provider's default parser will be used. Even though the JAXB Provider's default parser is not required to be SAX2.0 compliant, all providers are required to allow a client application to specify their own SAX2.0 parser. Some providers may require the client application to specify the SAX2.0 parser at schema compile time. See {@link #unmarshal(javax.xml.transform.Source) unmarshal(Source)} for more detail.

Validation and Well-Formedness

A client application can enable or disable JAXP 1.3 validation mechanism via the setSchema(javax.xml.validation.Schema) API. Sophisticated clients can specify their own validating SAX 2.0 compliant parser and bypass the JAXP 1.3 validation mechanism using the {@link #unmarshal(javax.xml.transform.Source) unmarshal(Source)} API.
Since unmarshalling invalid XML content is defined in JAXB 2.0, the Unmarshaller default validation event handler was made more lenient than in JAXB 1.0. When schema-derived code generated by JAXB 1.0 binding compiler is registered with {@link JAXBContext}, the default unmarshal validation handler is {@link javax.xml.bind.helpers.DefaultValidationEventHandler} and it terminates the marshal operation after encountering either a fatal error or an error. For a JAXB 2.0 client application, there is no explicitly defined default validation handler and the default event handling only terminates the marshal operation after encountering a fatal error.

Supported Properties

There currently are not any properties required to be supported by all JAXB Providers on Unmarshaller. However, some providers may support their own set of provider specific properties.

Unmarshal Event Callbacks

The {@link Unmarshaller} provides two styles of callback mechanisms that allow application specific processing during key points in the unmarshalling process. In 'class defined' event callbacks, application specific code placed in JAXB mapped classes is triggered during unmarshalling. 'External listeners' allow for centralized processing of unmarshal events in one callback method rather than by type event callbacks.
'Class defined' event callback methods allow any JAXB mapped class to specify its own specific callback methods by defining methods with the following method signature:
   // This method is called immediately after the object is created and before the unmarshalling of this 
   // object begins. The callback provides an opportunity to initialize JavaBean properties prior to unmarshalling.
   void beforeUnmarshal(Unmarshaller, Object parent);
 
   //This method is called after all the properties (except IDREF) are unmarshalled for this object, 
   //but before this object is set to the parent object.
   void afterUnmarshal(Unmarshaller, Object parent);
 
The class defined callback methods should be used when the callback method requires access to non-public methods and/or fields of the class.
The external listener callback mechanism enables the registration of a {@link Listener} instance with an {@link Unmarshaller#setListener(Listener)}. The external listener receives all callback events, allowing for more centralized processing than per class defined callback methods. The external listener receives events when unmarshalling proces is marshalling to a JAXB element or to JAXB mapped class.
The 'class defined' and external listener event callback methods are independent of each other, both can be called for one event. The invocation ordering when both listener callback methods exist is defined in {@link Listener#beforeUnmarshal(Object, Object)} and {@link Listener#afterUnmarshal(Object, Object)}.
An event callback method throwing an exception terminates the current unmarshal process.

Nested Class Summary
`abstract static class`	`Unmarshaller.Listener` Register an instance of an implementation of this class with javax.xml.bind.Unmarshaller to externally listen for unmarshal events.

Method Summary
`XmlAdapter`	`getAdapter(Class type)` Gets the adapter associated with the specified type.
`AttachmentUnmarshaller`	`getAttachmentUnmarshaller()`
`ValidationEventHandler`	`getEventHandler()` Return the current event handler or the default event handler if one hasn't been set.
`Unmarshaller.Listener`	`getListener()` Return javax.xml.bind.Unmarshaller.Listener registered with this javax.xml.bind.Unmarshaller.
`Object`	`getProperty(String name)` Get the particular property in the underlying implementation of `Unmarshaller`.
`Schema`	`getSchema()` Get the JAXP 1.3 javax.xml.validation.Schema object being used to perform unmarshal-time validation.
`UnmarshallerHandler`	`getUnmarshallerHandler()` Get an unmarshaller handler object that can be used as a component in an XML pipeline.
`boolean`	`isValidating()` Indicates whether or not the `Unmarshaller` is configured to validate during unmarshal operations.
`void`	`setAdapter(Class type, XmlAdapter adapter)` Associates a configured instance of javax.xml.bind.annotation.adapters.XmlAdapter with this unmarshaller.
`void`	`setAdapter(XmlAdapter adapter)` Associates a configured instance of javax.xml.bind.annotation.adapters.XmlAdapter with this unmarshaller.
`void`	`setAttachmentUnmarshaller(AttachmentUnmarshaller au)` Associate a context that resolves cid's, content-id URIs, to binary data passed as attachments.
`void`	`setEventHandler(ValidationEventHandler handler)` Allow an application to register a `ValidationEventHandler`.
`void`	`setListener(Unmarshaller.Listener listener)` Register unmarshal event callback javax.xml.bind.Unmarshaller.Listener with this javax.xml.bind.Unmarshaller.
`void`	`setProperty(String name, Object value)` Set the particular property in the underlying implementation of `Unmarshaller`.
`void`	`setSchema(Schema schema)` Specify the JAXP 1.3 javax.xml.validation.Schema object that should be used to validate subsequent unmarshal operations against.
`void`	`setValidating(boolean validating)` Specifies whether or not the default validation mechanism of the `Unmarshaller` should validate during unmarshal operations.
`Object`	`unmarshal(File f)` Unmarshal XML data from the specified file and return the resulting content tree.
`Object`	`unmarshal(InputSource source)` Unmarshal XML data from the specified SAX InputSource and return the resulting content tree.
`Object`	`unmarshal(InputStream is)` Unmarshal XML data from the specified InputStream and return the resulting content tree.
`Object`	`unmarshal(Node node)` Unmarshal global XML data from the specified DOM tree and return the resulting content tree.
`JAXBElement`	`unmarshal(Node node, Class declaredType)` Unmarshal XML data by JAXB mapped `declaredType` and return the resulting content tree.
`Object`	`unmarshal(Reader reader)` Unmarshal XML data from the specified Reader and return the resulting content tree.
`Object`	`unmarshal(Source source)` Unmarshal XML data from the specified XML Source and return the resulting content tree.
`JAXBElement`	`unmarshal(Source source, Class declaredType)` Unmarshal XML data from the specified XML Source by `declaredType` and return the resulting content tree.
`Object`	`unmarshal(URL url)` Unmarshal XML data from the specified URL and return the resulting content tree.
`Object`	`unmarshal(XMLEventReader reader)` Unmarshal XML data from the specified pull parser and return the resulting content tree.
`JAXBElement`	`unmarshal(XMLEventReader reader, Class declaredType)` Unmarshal root element to JAXB mapped `declaredType` and return the resulting content tree.
`Object`	`unmarshal(XMLStreamReader reader)` Unmarshal XML data from the specified pull parser and return the resulting content tree.
`JAXBElement`	`unmarshal(XMLStreamReader reader, Class declaredType)` Unmarshal root element to JAXB mapped `declaredType` and return the resulting content tree.

Method Detail

getAdapter

public XmlAdapter getAdapter(Class type)

Gets the adapter associated with the specified type. This is the reverse operation of the {@link #setAdapter} method.

Parameters:: type

getAttachmentUnmarshaller

public AttachmentUnmarshaller getAttachmentUnmarshaller()

getEventHandler

public ValidationEventHandler getEventHandler()
                                       throws JAXBException

Return the current event handler or the default event handler if one hasn't been set.

Returns:: the current ValidationEventHandler or the default event handler if it hasn't been set
Throws:: JAXBException - if an error was encountered while getting the current event handler

getListener

public Unmarshaller.Listener getListener()

Return {@link Listener} registered with this {@link Unmarshaller}.

Returns:: registered {@link Listener} or null if no Listener is registered with this Unmarshaller.

getProperty

public Object getProperty(String name)
                   throws PropertyException

Get the particular property in the underlying implementation of Unmarshaller. This method can only be used to get one of the standard JAXB defined properties above or a provider specific property. Attempting to get an undefined property will result in a PropertyException being thrown. See Supported Properties.

Parameters:: name - the name of the property to retrieve
Returns:: the value of the requested property
Throws:: PropertyException - when there is an error retrieving the given property or value property name

getSchema

public Schema getSchema()

Get the JAXP 1.3 {@link javax.xml.validation.Schema Schema} object being used to perform unmarshal-time validation. If there is no Schema set on the unmarshaller, then this method will return null indicating that unmarshal-time validation will not be performed.

This method provides replacement functionality for the deprecated {@link #isValidating()} API as well as access to the Schema object. To determine if the Unmarshaller has validation enabled, simply test the return type for null:

boolean isValidating = u.getSchema()!=null;

Returns:: the Schema object being used to perform unmarshal-time validation or null if not present

getUnmarshallerHandler

public UnmarshallerHandler getUnmarshallerHandler()

Get an unmarshaller handler object that can be used as a component in an XML pipeline.

The JAXB Provider can return the same handler object for multiple invocations of this method. In other words, this method does not necessarily create a new instance of UnmarshallerHandler. If the application needs to use more than one UnmarshallerHandler, it should create more than one Unmarshaller.

Returns:: the unmarshaller handler object

isValidating

public boolean isValidating()
                     throws JAXBException

Indicates whether or not the Unmarshaller is configured to validate during unmarshal operations.

This API returns the state of the JAXB Provider's default unmarshal-time validation mechanism.

This method is deprecated as of JAXB 2.0 - please use the new {@link #getSchema()} API.

Returns:: true if the Unmarshaller is configured to validate during unmarshal operations, false otherwise
Throws:: JAXBException - if an error occurs while retrieving the validating flag

setAdapter

public void setAdapter(Class type,
                       XmlAdapter adapter)

Associates a configured instance of {@link XmlAdapter} with this unmarshaller.

Every unmarshaller internally maintains a {@link java.util.Map}<{@link Class},{@link XmlAdapter}>, which it uses for unmarshalling classes whose fields/methods are annotated with {@link javax.xml.bind.annotation.adapters.XmlJavaTypeAdapter}.

This method allows applications to use a configured instance of {@link XmlAdapter}. When an instance of an adapter is not given, an unmarshaller will create one by invoking its default constructor.

Parameters:: type - The type of the adapter. The specified instance will be used when {@link javax.xml.bind.annotation.adapters.XmlJavaTypeAdapter#value()} refers to this type.; adapter - The instance of the adapter to be used. If null, it will un-register the current adapter set for this type.

setAdapter

public void setAdapter(XmlAdapter adapter)

Associates a configured instance of {@link XmlAdapter} with this unmarshaller.

This is a convenience method that invokes setAdapter(adapter.getClass(),adapter);.

Parameters:: adapter

setAttachmentUnmarshaller

public void setAttachmentUnmarshaller(AttachmentUnmarshaller au)

Associate a context that resolves cid's, content-id URIs, to binary data passed as attachments.

Unmarshal time validation, enabled via {@link #setSchema(Schema)}, must be supported even when unmarshaller is performing XOP processing.

Parameters:: au

setEventHandler

public void setEventHandler(ValidationEventHandler handler)
                     throws JAXBException

Allow an application to register a ValidationEventHandler.

The ValidationEventHandler will be called by the JAXB Provider if any validation errors are encountered during calls to any of the unmarshal methods. If the client application does not register a ValidationEventHandler before invoking the unmarshal methods, then ValidationEvents will be handled by the default event handler which will terminate the unmarshal operation after the first error or fatal error is encountered.

Calling this method with a null parameter will cause the Unmarshaller to revert back to the default event handler.

Parameters:: handler - the validation event handler
Throws:: JAXBException - if an error was encountered while setting the event handler

setListener

public void setListener(Unmarshaller.Listener listener)

There is only one Listener per Unmarshaller. Setting a Listener replaces the previous set Listener. One can unregister current Listener by setting listener to null.

Parameters:: listener - provides unmarshal event callbacks for this {@link Unmarshaller}

setProperty

public void setProperty(String name,
                        Object value)
                 throws PropertyException

Set the particular property in the underlying implementation of Unmarshaller. This method can only be used to set one of the standard JAXB defined properties above or a provider specific property. Attempting to set an undefined property will result in a PropertyException being thrown. See Supported Properties.

Parameters:: name - the name of the property to be set. This value can either be specified using one of the constant fields or a user supplied string.; value - the value of the property to be set
Throws:: PropertyException - when there is an error processing the given property or value

setSchema

public void setSchema(Schema schema)

Specify the JAXP 1.3 {@link javax.xml.validation.Schema Schema} object that should be used to validate subsequent unmarshal operations against. Passing null into this method will disable validation.

This method replaces the deprecated {@link #setValidating(boolean) setValidating(boolean)} API.

Initially this property is set to null.

Parameters:: schema - Schema object to validate unmarshal operations against or null to disable validation

setValidating

public void setValidating(boolean validating)
                   throws JAXBException

Specifies whether or not the default validation mechanism of the Unmarshaller should validate during unmarshal operations. By default, the Unmarshaller does not validate.

This method may only be invoked before or after calling one of the unmarshal methods.

This method only controls the JAXB Provider's default unmarshal-time validation mechanism - it has no impact on clients that specify their own validating SAX 2.0 compliant parser. Clients that specify their own unmarshal-time validation mechanism may wish to turn off the JAXB Provider's default validation mechanism via this API to avoid "double validation".

This method is deprecated as of JAXB 2.0 - please use the new {@link #setSchema(javax.xml.validation.Schema)} API.

Parameters:: validating - true if the Unmarshaller should validate during unmarshal, false otherwise
Throws:: JAXBException - if an error occurred while enabling or disabling validation at unmarshal time

unmarshal

public Object unmarshal(File f)
                 throws JAXBException

Unmarshal XML data from the specified file and return the resulting content tree.

Implements Unmarshal Global Root Element.

Parameters:: f - the file to unmarshal XML data from
Returns:: the newly created root object of the java content tree
Throws:: JAXBException - If any unexpected errors occur while unmarshalling

unmarshal

public Object unmarshal(InputSource source)
                 throws JAXBException

Unmarshal XML data from the specified SAX InputSource and return the resulting content tree.

Implements Unmarshal Global Root Element.

Parameters:: source - the input source to unmarshal XML data from
Returns:: the newly created root object of the java content tree
Throws:: JAXBException - If any unexpected errors occur while unmarshalling

unmarshal

public Object unmarshal(InputStream is)
                 throws JAXBException

Unmarshal XML data from the specified InputStream and return the resulting content tree. Validation event location information may be incomplete when using this form of the unmarshal API.

Implements Unmarshal Global Root Element.

Parameters:: is - the InputStream to unmarshal XML data from
Returns:: the newly created root object of the java content tree
Throws:: JAXBException - If any unexpected errors occur while unmarshalling

unmarshal

public Object unmarshal(Node node)
                 throws JAXBException

Unmarshal global XML data from the specified DOM tree and return the resulting content tree.

Implements Unmarshal Global Root Element.

Parameters:: node - the document/element to unmarshal XML data from. The caller must support at least Document and Element.
Returns:: the newly created root object of the java content tree
Throws:: JAXBException - If any unexpected errors occur while unmarshalling

unmarshal

public JAXBElement unmarshal(Node node,
                             Class declaredType)
                      throws JAXBException

Unmarshal XML data by JAXB mapped declaredType and return the resulting content tree.

Implements Unmarshal by Declared Type

Parameters:: node - the document/element to unmarshal XML data from. The caller must support at least Document and Element.; declaredType - appropriate JAXB mapped class to hold node's XML data.
Returns:: JAXB Element representation of node
Throws:: JAXBException - If any unexpected errors occur while unmarshalling

unmarshal

public Object unmarshal(Reader reader)
                 throws JAXBException

Unmarshal XML data from the specified Reader and return the resulting content tree. Validation event location information may be incomplete when using this form of the unmarshal API, because a Reader does not provide the system ID.

Implements Unmarshal Global Root Element.

Parameters:: reader - the Reader to unmarshal XML data from
Returns:: the newly created root object of the java content tree
Throws:: JAXBException - If any unexpected errors occur while unmarshalling

unmarshal

public Object unmarshal(Source source)
                 throws JAXBException

Unmarshal XML data from the specified XML Source and return the resulting content tree.

Implements Unmarshal Global Root Element.

SAX 2.0 Parser Pluggability

A client application can choose not to use the default parser mechanism supplied with their JAXB provider. Any SAX 2.0 compliant parser can be substituted for the JAXB provider's default mechanism. To do so, the client application must properly configure a SAXSource containing an XMLReader implemented by the SAX 2.0 parser provider. If the XMLReader has an org.xml.sax.ErrorHandler registered on it, it will be replaced by the JAXB Provider so that validation errors can be reported via the ValidationEventHandler mechanism of JAXB. If the SAXSource does not contain an XMLReader, then the JAXB provider's default parser mechanism will be used.

This parser replacement mechanism can also be used to replace the JAXB provider's unmarshal-time validation engine. The client application must properly configure their SAX 2.0 compliant parser to perform validation (as shown in the example above). Any SAXParserExceptions encountered by the parser during the unmarshal operation will be processed by the JAXB provider and converted into JAXB ValidationEvent objects which will be reported back to the client via the ValidationEventHandler registered with the Unmarshaller. Note: specifying a substitute validating SAX 2.0 parser for unmarshalling does not necessarily replace the validation engine used by the JAXB provider for performing on-demand validation.

The only way for a client application to specify an alternate parser mechanism to be used during unmarshal is via the unmarshal(SAXSource) API. All other forms of the unmarshal method (File, URL, Node, etc) will use the JAXB provider's default parser and validator mechanisms.

Parameters:: source - the XML Source to unmarshal XML data from (providers are only required to support SAXSource, DOMSource, and StreamSource)
Returns:: the newly created root object of the java content tree
Throws:: JAXBException - If any unexpected errors occur while unmarshalling

unmarshal

public JAXBElement unmarshal(Source source,
                             Class declaredType)
                      throws JAXBException

Unmarshal XML data from the specified XML Source by declaredType and return the resulting content tree.

Implements Unmarshal by Declared Type

See SAX 2.0 Parser Pluggability

Parameters:: source - the XML Source to unmarshal XML data from (providers are only required to support SAXSource, DOMSource, and StreamSource); declaredType - appropriate JAXB mapped class to hold source's xml root element
Returns:: Java content rooted by JAXB Element
Throws:: JAXBException - If any unexpected errors occur while unmarshalling

unmarshal

public Object unmarshal(URL url)
                 throws JAXBException

Unmarshal XML data from the specified URL and return the resulting content tree.

Implements Unmarshal Global Root Element.

Parameters:: url - the url to unmarshal XML data from
Returns:: the newly created root object of the java content tree
Throws:: JAXBException - If any unexpected errors occur while unmarshalling

unmarshal

public Object unmarshal(XMLEventReader reader)
                 throws JAXBException

Unmarshal XML data from the specified pull parser and return the resulting content tree.

This method is an Unmarshal Global Root method.

This method assumes that the parser is on a START_DOCUMENT or START_ELEMENT event. Unmarshalling will be done from this start event to the corresponding end event. If this method returns successfully, the reader will be pointing at the token right after the end event.

Parameters:: reader - The parser to be read.
Returns:: the newly created root object of the java content tree.
Throws:: JAXBException - If any unexpected errors occur while unmarshalling

unmarshal

public JAXBElement unmarshal(XMLEventReader reader,
                             Class declaredType)
                      throws JAXBException

Unmarshal root element to JAXB mapped declaredType and return the resulting content tree.

This method implements unmarshal by declaredType.

Parameters:: reader - The parser to be read.; declaredType - appropriate JAXB mapped class to hold reader's START_ELEMENT XML data.
Returns:: content tree rooted by JAXB Element representation
Throws:: JAXBException - If any unexpected errors occur while unmarshalling

unmarshal

public Object unmarshal(XMLStreamReader reader)
                 throws JAXBException

Unmarshal XML data from the specified pull parser and return the resulting content tree.

Implements Unmarshal Global Root Element.

Parameters:: reader - The parser to be read.
Returns:: the newly created root object of the java content tree.
Throws:: JAXBException - If any unexpected errors occur while unmarshalling

unmarshal

public JAXBElement unmarshal(XMLStreamReader reader,
                             Class declaredType)
                      throws JAXBException

Unmarshal root element to JAXB mapped declaredType and return the resulting content tree.

This method implements unmarshal by declaredType.

Parameters:: reader - The parser to be read.; declaredType - appropriate JAXB mapped class to hold reader's START_ELEMENT XML data.
Returns:: content tree rooted by JAXB Element representation
Throws:: JAXBException - If any unexpected errors occur while unmarshalling

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This page displays the Jadeite version of the documention, which is derived from the offical documentation that contains this copyright notice:

The official Sun™ documentation can be found here at http://java.sun.com/javase/6/docs/api/.

Unmarshal By Declared Type returned JAXBElement
JAXBElement Property	Value
name	`xml element name`
value	`instanceof declaredType`
declaredType	unmarshal method `declaredType` parameter
scope	`null` (actual scope is unknown)

javax.xml.bindinterface Unmarshaller

getAdapter

getAttachmentUnmarshaller

getEventHandler

getListener

getProperty

getSchema

getUnmarshallerHandler

isValidating

setAdapter

setAdapter

setAttachmentUnmarshaller

setEventHandler

setListener

setProperty

setSchema

setValidating

unmarshal

unmarshal

unmarshal

unmarshal

unmarshal

unmarshal

unmarshal

unmarshal

unmarshal

unmarshal

unmarshal

unmarshal

unmarshal

javax.xml.bind
interface Unmarshaller