Java™ Platform
Standard Ed. 6

javax.xml.bind.helpers
Class AbstractUnmarshallerImpl

java.lang.Object
  extended by javax.xml.bind.helpers.AbstractUnmarshallerImpl
All Implemented Interfaces:
Unmarshaller

public abstract class AbstractUnmarshallerImpl
extends Object
implements Unmarshaller

Partial default Unmarshaller implementation.

This class provides a partial default implementation for the Unmarshallerinterface.

A JAXB Provider has to implement five methods (getUnmarshallerHandler, unmarshal(Node), unmarshal(XMLReader,InputSource), unmarshal(XMLStreamReader), and unmarshal(XMLEventReader).

Since:
JAXB1.0
See Also:
Unmarshaller

Nested Class Summary
 
Nested classes/interfaces inherited from interface javax.xml.bind.Unmarshaller
Unmarshaller.Listener
 
Field Summary
protected  boolean validating
          whether or not the unmarshaller will validate
 
Constructor Summary
AbstractUnmarshallerImpl()
           
 
Method Summary
protected  UnmarshalException createUnmarshalException(SAXException e)
          Creates an UnmarshalException from a SAXException.
<A extends XmlAdapter>
A
getAdapter(Class<A> 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 Unmarshaller.Listener registered with this Unmarshaller.
 Object getProperty(String name)
          Default implementation of the getProperty method always throws PropertyException since there are no required properties.
 Schema getSchema()
          Get the JAXP 1.3 Schema object being used to perform unmarshal-time validation.
protected  XMLReader getXMLReader()
          Obtains a configured XMLReader.
 boolean isValidating()
          Indicates whether or not the Unmarshaller is configured to validate during unmarshal operations.
<A extends XmlAdapter>
void
setAdapter(Class<A> type, A adapter)
          Associates a configured instance of XmlAdapter with this unmarshaller.
 void setAdapter(XmlAdapter adapter)
          Associates a configured instance of 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 validation event handler.
 void setListener(Unmarshaller.Listener listener)
           Register unmarshal event callback Unmarshaller.Listener with this Unmarshaller.
 void setProperty(String name, Object value)
          Default implementation of the setProperty method always throws PropertyException since there are no required properties.
 void setSchema(Schema schema)
          Specify the JAXP 1.3 Schema object that should be used to validate subsequent unmarshal operations against.
 void setValidating(boolean validating)
          Specifies whether or not 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.
<T> JAXBElement<T>
unmarshal(Node node, Class<T> expectedType)
          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.
<T> JAXBElement<T>
unmarshal(Source source, Class<T> expectedType)
          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.
<T> JAXBElement<T>
unmarshal(XMLEventReader reader, Class<T> expectedType)
          Unmarshal root element to JAXB mapped declaredType and return the resulting content tree.
protected abstract  Object unmarshal(XMLReader reader, InputSource source)
          Unmarshals an object by using the specified XMLReader and the InputSource.
 Object unmarshal(XMLStreamReader reader)
          Unmarshal XML data from the specified pull parser and return the resulting content tree.
<T> JAXBElement<T>
unmarshal(XMLStreamReader reader, Class<T> expectedType)
          Unmarshal root element to JAXB mapped declaredType and return the resulting content tree.
 
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 
Methods inherited from interface javax.xml.bind.Unmarshaller
getUnmarshallerHandler, unmarshal
 

Field Detail

validating

protected boolean validating
whether or not the unmarshaller will validate

Constructor Detail

AbstractUnmarshallerImpl

public AbstractUnmarshallerImpl()
Method Detail

getXMLReader

protected XMLReader getXMLReader()
                          throws JAXBException
Obtains a configured XMLReader. This method is used when the client-specified SAXSource object doesn't have XMLReader. Unmarshaller is not re-entrant, so we will only use one instance of XMLReader.

Throws:
JAXBException

unmarshal

public Object unmarshal(Source source)
                 throws JAXBException
Description copied from interface: Unmarshaller
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.

Specified by:
unmarshal in interface Unmarshaller
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
UnmarshalException - If the ValidationEventHandler returns false from its handleEvent method or the Unmarshaller is unable to perform the XML to Java binding. See Unmarshalling XML Data
See Also:
Unmarshaller.unmarshal(javax.xml.transform.Source, Class)

unmarshal

protected abstract Object unmarshal(XMLReader reader,
                                    InputSource source)
                             throws JAXBException
Unmarshals an object by using the specified XMLReader and the InputSource. The callee should call the setErrorHandler method of the XMLReader so that errors are passed to the client-specified ValidationEventHandler.

Throws:
JAXBException

unmarshal

public final Object unmarshal(InputSource source)
                       throws JAXBException
Description copied from interface: Unmarshaller
Unmarshal XML data from the specified SAX InputSource and return the resulting content tree.

Implements Unmarshal Global Root Element.

Specified by:
unmarshal in interface Unmarshaller
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
UnmarshalException - If the ValidationEventHandler returns false from its handleEvent method or the Unmarshaller is unable to perform the XML to Java binding. See Unmarshalling XML Data

unmarshal

public final Object unmarshal(URL url)
                       throws JAXBException
Description copied from interface: Unmarshaller
Unmarshal XML data from the specified URL and return the resulting content tree.

Implements Unmarshal Global Root Element.

Specified by:
unmarshal in interface Unmarshaller
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
UnmarshalException - If the ValidationEventHandler returns false from its handleEvent method or the Unmarshaller is unable to perform the XML to Java binding. See Unmarshalling XML Data

unmarshal

public final Object unmarshal(File f)
                       throws JAXBException
Description copied from interface: Unmarshaller
Unmarshal XML data from the specified file and return the resulting content tree.

Implements Unmarshal Global Root Element.

Specified by:
unmarshal in interface Unmarshaller
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
UnmarshalException - If the ValidationEventHandler returns false from its handleEvent method or the Unmarshaller is unable to perform the XML to Java binding. See Unmarshalling XML Data

unmarshal

public final Object unmarshal(InputStream is)
                       throws JAXBException
Description copied from interface: Unmarshaller
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.

Specified by:
unmarshal in interface Unmarshaller
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
UnmarshalException - If the ValidationEventHandler returns false from its handleEvent method or the Unmarshaller is unable to perform the XML to Java binding. See Unmarshalling XML Data

unmarshal

public final Object unmarshal(Reader reader)
                       throws JAXBException
Description copied from interface: Unmarshaller
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.

Specified by:
unmarshal in interface Unmarshaller
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
UnmarshalException - If the ValidationEventHandler returns false from its handleEvent method or the Unmarshaller is unable to perform the XML to Java binding. See Unmarshalling XML Data

isValidating

public boolean isValidating()
                     throws JAXBException
Indicates whether or not the Unmarshaller is configured to validate during unmarshal operations.

Note: I named this method isValidating() to stay in-line with JAXP, as opposed to naming it getValidating().

Specified by:
isValidating in interface Unmarshaller
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

setEventHandler

public void setEventHandler(ValidationEventHandler handler)
                     throws JAXBException
Allow an application to register a validation event handler.

The validation event handler 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 validation event handler before invoking the unmarshal methods, then all validation events will be silently ignored and may result in unexpected behaviour.

Specified by:
setEventHandler in interface Unmarshaller
Parameters:
handler - the validation event handler
Throws:
JAXBException - if an error was encountered while setting the event handler

setValidating

public void setValidating(boolean validating)
                   throws JAXBException
Specifies whether or not 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.

Specified by:
setValidating in interface Unmarshaller
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

getEventHandler

public ValidationEventHandler getEventHandler()
                                       throws JAXBException
Return the current event handler or the default event handler if one hasn't been set.

Specified by:
getEventHandler in interface Unmarshaller
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

createUnmarshalException

protected UnmarshalException createUnmarshalException(SAXException e)
Creates an UnmarshalException from a SAXException. This is an utility method provided for the derived classes.

When a provider-implemented ContentHandler wants to throw a JAXBException, it needs to wrap the exception by a SAXException. If the unmarshaller implementation blindly wrap SAXException by JAXBException, such an exception will be a JAXBException wrapped by a SAXException wrapped by another JAXBException. This is silly.

This method checks the nested exception of SAXException and reduce those excessive wrapping.

Returns:
the resulting UnmarshalException

setProperty

public void setProperty(String name,
                        Object value)
                 throws PropertyException
Default implementation of the setProperty method always throws PropertyException since there are no required properties. If a provider needs to handle additional properties, it should override this method in a derived class.

Specified by:
setProperty in interface Unmarshaller
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

getProperty

public Object getProperty(String name)
                   throws PropertyException
Default implementation of the getProperty method always throws PropertyException since there are no required properties. If a provider needs to handle additional properties, it should override this method in a derived class.

Specified by:
getProperty in interface Unmarshaller
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

unmarshal

public Object unmarshal(XMLEventReader reader)
                 throws JAXBException
Description copied from interface: Unmarshaller
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.

Specified by:
unmarshal in interface Unmarshaller
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
UnmarshalException - If the ValidationEventHandler returns false from its handleEvent method or the Unmarshaller is unable to perform the XML to Java binding. See Unmarshalling XML Data
See Also:
Unmarshaller.unmarshal(javax.xml.stream.XMLEventReader, Class)

unmarshal

public Object unmarshal(XMLStreamReader reader)
                 throws JAXBException
Description copied from interface: Unmarshaller
Unmarshal XML data from the specified pull parser and return the resulting content tree.

Implements Unmarshal Global Root Element.

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.

Specified by:
unmarshal in interface Unmarshaller
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
UnmarshalException - If the ValidationEventHandler returns false from its handleEvent method or the Unmarshaller is unable to perform the XML to Java binding. See Unmarshalling XML Data
See Also:
Unmarshaller.unmarshal(javax.xml.stream.XMLStreamReader, Class)

unmarshal

public <T> JAXBElement<T> unmarshal(Node node,
                                    Class<T> expectedType)
                         throws JAXBException
Description copied from interface: Unmarshaller
Unmarshal XML data by JAXB mapped declaredType and return the resulting content tree.

Implements Unmarshal by Declared Type

Specified by:
unmarshal in interface Unmarshaller
Parameters:
node - the document/element to unmarshal XML data from. The caller must support at least Document and Element.
expectedType - 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
UnmarshalException - If the ValidationEventHandler returns false from its handleEvent method or the Unmarshaller is unable to perform the XML to Java binding. See Unmarshalling XML Data

unmarshal

public <T> JAXBElement<T> unmarshal(Source source,
                                    Class<T> expectedType)
                         throws JAXBException
Description copied from interface: Unmarshaller
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

Specified by:
unmarshal in interface Unmarshaller
Parameters:
source - the XML Source to unmarshal XML data from (providers are only required to support SAXSource, DOMSource, and StreamSource)
expectedType - 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
UnmarshalException - If the ValidationEventHandler returns false from its handleEvent method or the Unmarshaller is unable to perform the XML to Java binding. See Unmarshalling XML Data

unmarshal

public <T> JAXBElement<T> unmarshal(XMLStreamReader reader,
                                    Class<T> expectedType)
                         throws JAXBException
Description copied from interface: Unmarshaller
Unmarshal root element to JAXB mapped declaredType and return the resulting content tree.

This method implements unmarshal by declaredType.

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.

Specified by:
unmarshal in interface Unmarshaller
Parameters:
reader - The parser to be read.
expectedType - 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
UnmarshalException - If the ValidationEventHandler returns false from its handleEvent method or the Unmarshaller is unable to perform the XML to Java binding. See Unmarshalling XML Data

unmarshal

public <T> JAXBElement<T> unmarshal(XMLEventReader reader,
                                    Class<T> expectedType)
                         throws JAXBException
Description copied from interface: Unmarshaller
Unmarshal root element to JAXB mapped declaredType and return the resulting content tree.

This method implements unmarshal by declaredType.

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.

Specified by:
unmarshal in interface Unmarshaller
Parameters:
reader - The parser to be read.
expectedType - 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
UnmarshalException - If the ValidationEventHandler returns false from its handleEvent method or the Unmarshaller is unable to perform the XML to Java binding. See Unmarshalling XML Data

setSchema

public void setSchema(Schema schema)
Description copied from interface: Unmarshaller
Specify the JAXP 1.3 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 setValidating(boolean) API.

Initially this property is set to null.

Specified by:
setSchema in interface Unmarshaller
Parameters:
schema - Schema object to validate unmarshal operations against or null to disable validation

getSchema

public Schema getSchema()
Description copied from interface: Unmarshaller
Get the JAXP 1.3 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 Unmarshaller.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;

Specified by:
getSchema in interface Unmarshaller
Returns:
the Schema object being used to perform unmarshal-time validation or null if not present

setAdapter

public void setAdapter(XmlAdapter adapter)
Description copied from interface: Unmarshaller
Associates a configured instance of XmlAdapter with this unmarshaller.

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

Specified by:
setAdapter in interface Unmarshaller
See Also:
Unmarshaller.setAdapter(Class,XmlAdapter)

setAdapter

public <A extends XmlAdapter> void setAdapter(Class<A> type,
                                              A adapter)
Description copied from interface: Unmarshaller
Associates a configured instance of XmlAdapter with this unmarshaller.

Every unmarshaller internally maintains a Map<Class,XmlAdapter>, which it uses for unmarshalling classes whose fields/methods are annotated with XmlJavaTypeAdapter.

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

Specified by:
setAdapter in interface Unmarshaller
Parameters:
type - The type of the adapter. The specified instance will be used when 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.

getAdapter

public <A extends XmlAdapter> A getAdapter(Class<A> type)
Description copied from interface: Unmarshaller
Gets the adapter associated with the specified type. This is the reverse operation of the Unmarshaller.setAdapter(javax.xml.bind.annotation.adapters.XmlAdapter) method.

Specified by:
getAdapter in interface Unmarshaller

setAttachmentUnmarshaller

public void setAttachmentUnmarshaller(AttachmentUnmarshaller au)
Description copied from interface: Unmarshaller

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

Unmarshal time validation, enabled via Unmarshaller.setSchema(Schema), must be supported even when unmarshaller is performing XOP processing.

Specified by:
setAttachmentUnmarshaller in interface Unmarshaller

getAttachmentUnmarshaller

public AttachmentUnmarshaller getAttachmentUnmarshaller()
Specified by:
getAttachmentUnmarshaller in interface Unmarshaller

setListener

public void setListener(Unmarshaller.Listener listener)
Description copied from interface: Unmarshaller

Register unmarshal event callback Unmarshaller.Listener with this Unmarshaller.

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.

Specified by:
setListener in interface Unmarshaller
Parameters:
listener - provides unmarshal event callbacks for this Unmarshaller

getListener

public Unmarshaller.Listener getListener()
Description copied from interface: Unmarshaller

Return Unmarshaller.Listener registered with this Unmarshaller.

Specified by:
getListener in interface Unmarshaller
Returns:
registered Unmarshaller.Listener or null if no Listener is registered with this Unmarshaller.

Java™ Platform
Standard Ed. 6

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