Package jakarta.xml.bind.helpers

Class AbstractUnmarshallerImpl

java.lang.Object
jakarta.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 Jakarta XML Binding Provider has to implement five methods (getUnmarshallerHandler, unmarshal(Node), unmarshal(XMLReader,InputSource), unmarshal(XMLStreamReader), and unmarshal(XMLEventReader).

Since:
1.6, JAXB 1.0
See Also:

  • Field Details

    • validating

      protected boolean validating
      whether or not the unmarshaller will validate

  • Constructor Details

    • AbstractUnmarshallerImpl

      public AbstractUnmarshallerImpl()

  • Method Details

    • 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 Jakarta XML Binding provider. Any SAX 2.0 compliant parser can be substituted for the Jakarta XML Binding 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 Jakarta XML Binding Provider so that validation errors can be reported via the ValidationEventHandler mechanism of Jakarta XML Binding. If the SAXSource does not contain an XMLReader, then the Jakarta XML Binding provider's default parser mechanism will be used.

      This parser replacement mechanism can also be used to replace the Jakarta XML Binding 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 Jakarta XML Binding provider and converted into Jakarta XML Binding 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 Jakarta XML Binding 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 Jakarta XML Binding 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:

    • 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 Jakarta XML Binding 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:

    • 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:

    • unmarshal

      public <T> JAXBElement<T> unmarshal(Node node, Class<T> expectedType) throws JAXBException
      Description copied from interface: Unmarshaller
      Unmarshal XML data by Jakarta XML Binding 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 Jakarta XML Binding mapped class to hold node's XML data.
      Returns:
      JAXBElement 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 Jakarta XML Binding mapped class to hold source's xml root element
      Returns:
      Java content rooted by JAXBElement
      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 Jakarta XML Binding 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 Jakarta XML Binding mapped class to hold reader's START_ELEMENT XML data.
      Returns:
      content tree rooted by JAXBElement 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 Jakarta XML Binding 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 Jakarta XML Binding mapped class to hold reader's START_ELEMENT XML data.
      Returns:
      content tree rooted by JAXBElement 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:

    • 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(jakarta.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.