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## javax.xml.bind.helpers
Class AbstractUnmarshallerImpl

    java.lang.Object
      |
      +--javax.xml.bind.helpers.AbstractUnmarshallerImpl

All Implemented Interfaces:
  Unmarshaller

public abstract class AbstractUnmarshallerImpl
extends java.lang.Object
implements Unmarshaller

Partial default `Unmarshaller` implementation.

This class provides a partial default implementation for the `Unmarshaller` interface.

A JAXB Provider has to implement three methods (getUnmarshallerHandler, unmarshal(Node), and unmarshal(XMLReader,InputSource)

Since:
  JAXB1.0
Version:
  $Revision: 1.1 $ $Date: 2008/11/03 06:51:08 $
Author:
  - Kohsuke Kawaguchi, Sun Microsystems, Inc.
See Also:
  `Unmarshaller`

Constructor Summary
`AbstractUnmarshallerImpl()`

Method Summary
`protected UnmarshalException` | `createUnmarshalException(org.xml.sax.SAXException e)` Creates an UnmarshalException from a SAXException.
`ValidationEventHandler` | `getEventHandler()` Return the current event handler or the default event handler if one hasn't been set.
`java.lang.Object` | `getProperty(java.lang.String name)` Default implementation of the getProperty method always throws PropertyException since there are no required properties.
`protected org.xml.sax.XMLReader` | `getXMLReader()` Obtains a configured XMLReader.
`boolean` | `isValidating()` Indicates whether or not the Unmarshaller is configured to validate during unmarshal operations.
`void` | `setEventHandler(ValidationEventHandler handler)` Allow an application to register a validation event handler.
`void` | `setProperty(java.lang.String name, java.lang.Object value)` Default implementation of the setProperty method always throws PropertyException since there are no required properties.
`void` | `setValidating(boolean validating)` Specifies whether or not the Unmarshaller should validate during unmarshal operations.
`java.lang.Object` | `unmarshal(java.io.File f)` Unmarshal XML data from the specified file and return the resulting content tree.
`java.lang.Object` | `unmarshal(org.xml.sax.InputSource source)` Unmarshal XML data from the specified SAX InputSource and return the resulting content tree.
`java.lang.Object` | `unmarshal(java.io.InputStream is)` Unmarshal XML data from the specified InputStream and return the resulting content tree.
`java.lang.Object` | `unmarshal(javax.xml.transform.Source source)` Unmarshal XML data from the specified XML Source and return the resulting content tree.
`java.lang.Object` | `unmarshal(java.net.URL url)` Unmarshal XML data from the specified URL and return the resulting content tree.
`protected abstract java.lang.Object` | `unmarshal(org.xml.sax.XMLReader reader, org.xml.sax.InputSource source)` Unmarshals an object by using the specified XMLReader and the InputSource.

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`

Constructor Detail

### AbstractUnmarshallerImpl

    public AbstractUnmarshallerImpl()

Method Detail

### getXMLReader

    protected org.xml.sax.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.

    `JAXBException`

### unmarshal

    public java.lang.Object unmarshal(javax.xml.transform.Source source)
                               throws JAXBException

  Description copied from interface: `Unmarshaller`
  Unmarshal XML data from the specified XML Source and return the resulting content tree.

  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

### unmarshal

    protected abstract java.lang.Object unmarshal(org.xml.sax.XMLReader reader,
                                                  org.xml.sax.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.

    `JAXBException`

### unmarshal

    public final java.lang.Object unmarshal(org.xml.sax.InputSource source)
                                     throws JAXBException

  Description copied from interface: `Unmarshaller`
  Unmarshal XML data from the specified SAX InputSource and return the resulting content tree.

  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

### unmarshal

    public final java.lang.Object unmarshal(java.net.URL url)
                                     throws JAXBException

  Description copied from interface: `Unmarshaller`
  Unmarshal XML data from the specified URL and return the resulting content tree.

  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

### unmarshal

    public final java.lang.Object unmarshal(java.io.File f)
                                     throws JAXBException

  Description copied from interface: `Unmarshaller`
  Unmarshal XML data from the specified file and return the resulting content tree.

  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

### unmarshal

    public final java.lang.Object unmarshal(java.io.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.

  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

### 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(org.xml.sax.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(java.lang.String name,
                            java.lang.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 java.lang.Object getProperty(java.lang.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

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