javax.xml.bind.Marshaller Maven / Gradle / Ivy
/*
* Copyright 2003 Sun Microsystems, Inc. All rights reserved.
* SUN PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
*/
package javax.xml.bind;
import javax.xml.bind.annotation.XmlRootElement;
import javax.xml.bind.annotation.adapters.XmlAdapter;
import javax.xml.bind.attachment.AttachmentMarshaller;
import javax.xml.validation.Schema;
import java.io.File;
/**
*
* The Marshaller class is responsible for governing the process
* of serializing Java content trees back into XML data. It provides the basic
* marshalling methods:
*
*
* Assume the following setup code for all following code fragments:
*
*
* JAXBContext jc = JAXBContext.newInstance( "com.acme.foo" );
* Unmarshaller u = jc.createUnmarshaller();
* Object element = u.unmarshal( new File( "foo.xml" ) );
* Marshaller m = jc.createMarshaller();
*
*
*
*
* Marshalling to a File:
*
*
* OutputStream os = new FileOutputStream( "nosferatu.xml" );
* m.marshal( element, os );
*
*
*
*
* Marshalling to a SAX ContentHandler:
*
*
* // assume MyContentHandler instanceof ContentHandler
* m.marshal( element, new MyContentHandler() );
*
*
*
*
* Marshalling to a DOM Node:
*
*
* DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
* dbf.setNamespaceAware(true);
* DocumentBuilder db = dbf.newDocumentBuilder();
* Document doc = db.newDocument();
*
* m.marshal( element, doc );
*
*
*
*
* Marshalling to a java.io.OutputStream:
*
*
* m.marshal( element, System.out );
*
*
*
*
* Marshalling to a java.io.Writer:
*
*
* m.marshal( element, new PrintWriter( System.out ) );
*
*
*
*
* Marshalling to a javax.xml.transform.SAXResult:
*
*
* // assume MyContentHandler instanceof ContentHandler
* SAXResult result = new SAXResult( new MyContentHandler() );
*
* m.marshal( element, result );
*
*
*
*
* Marshalling to a javax.xml.transform.DOMResult:
*
*
* DOMResult result = new DOMResult();
*
* m.marshal( element, result );
*
*
*
*
* Marshalling to a javax.xml.transform.StreamResult:
*
*
* StreamResult result = new StreamResult( System.out );
*
* m.marshal( element, result );
*
*
*
*
* Marshalling to a javax.xml.stream.XMLStreamWriter:
*
*
* XMLStreamWriter xmlStreamWriter =
* XMLOutputFactory.newInstance().createXMLStreamWriter( ... );
*
* m.marshal( element, xmlStreamWriter );
*
*
*
*
* Marshalling to a javax.xml.stream.XMLEventWriter:
*
*
* XMLEventWriter xmlEventWriter =
* XMLOutputFactory.newInstance().createXMLEventWriter( ... );
*
* m.marshal( element, xmlEventWriter );
*
*
*
*
*
* Marshalling content tree rooted by a JAXB element
*
* The first parameter of the overloaded
* Marshaller.marshal(java.lang.Object, ...) methods must be a
* JAXB element as computed by
* {@link JAXBIntrospector#isElement(java.lang.Object)};
* otherwise, a Marshaller.marshal method must throw a
* {@link MarshalException}. There exist two mechanisms
* to enable marshalling an instance that is not a JAXB element.
* One method is to wrap the instance as a value of a {@link JAXBElement},
* and pass the wrapper element as the first parameter to
* a Marshaller.marshal method. For java to schema binding, it
* is also possible to simply annotate the instance's class with
* @{@link XmlRootElement}.
*
*
*
* Encoding
*
* By default, the Marshaller will use UTF-8 encoding when generating XML data
* to a java.io.OutputStream, or a java.io.Writer. Use the
* {@link #setProperty(String,Object) setProperty} API to change the output
* encoding used during these marshal operations. Client applications are
* expected to supply a valid character encoding name as defined in the
* W3C XML 1.0
* Recommendation and supported by your
*
* Java Platform.
*
*
*
* Validation and Well-Formedness
*
*
* Client applications are not required to validate the Java content tree prior
* to calling any of the marshal API's. Furthermore, there is no requirement
* that the Java content tree be valid with respect to its original schema in
* order to marshal it back into XML data. Different JAXB Providers will
* support marshalling invalid Java content trees at varying levels, however
* all JAXB Providers must be able to marshal a valid content tree back to
* XML data. A JAXB Provider must throw a MarshalException when it
* is unable to complete the marshal operation due to invalid content. Some
* JAXB Providers will fully allow marshalling invalid content, others will fail
* on the first validation error.
*
* Even when schema validation is not explictly enabled for the marshal operation,
* it is possible that certain types of validation events will be detected
* during the operation. Validation events will be reported to the registered
* event handler. If the client application has not registered an event handler
* prior to invoking one of the marshal API's, then events will be delivered to
* a default event handler which will terminate the marshal operation after
* encountering the first error or fatal error. Note that for JAXB 2.0 and
* later versions, {@link javax.xml.bind.helpers.DefaultValidationEventHandler} is
* no longer used.
*
*
*
*
*
* All JAXB Providers are required to support the following set of properties.
* Some providers may support additional properties.
*
* - jaxb.encoding - value must be a java.lang.String
*
- The output encoding to use when marshalling the XML data. The
* Marshaller will use "UTF-8" by default if this property is not
* specified.
* - jaxb.formatted.output - value must be a java.lang.Boolean
*
- This property controls whether or not the Marshaller will format
* the resulting XML data with line breaks and indentation. A
* true value for this property indicates human readable indented
* xml data, while a false value indicates unformatted xml data.
* The Marshaller will default to false (unformatted) if this
* property is not specified.
* - jaxb.schemaLocation - value must be a java.lang.String
*
- This property allows the client application to specify an
* xsi:schemaLocation attribute in the generated XML data. The format of
* the schemaLocation attribute value is discussed in an easy to
* understand, non-normative form in
* Section 5.6
* of the W3C XML Schema Part 0: Primer and specified in
*
* Section 2.6 of the W3C XML Schema Part 1: Structures.
* - jaxb.noNamespaceSchemaLocation - value must be a java.lang.String
*
- This property allows the client application to specify an
* xsi:noNamespaceSchemaLocation attribute in the generated XML
* data. The format of the schemaLocation attribute value is discussed in
* an easy to understand, non-normative form in
* Section 5.6
* of the W3C XML Schema Part 0: Primer and specified in
*
* Section 2.6 of the W3C XML Schema Part 1: Structures.
* - jaxb.fragment - value must be a java.lang.Boolean
*
- This property determines whether or not document level events will be
* generated by the Marshaller. If the property is not specified, the
* default is false. This property has different implications depending
* on which marshal api you are using - when this property is set to true:
*
* - {@link #marshal(Object,org.xml.sax.ContentHandler) marshal(Object,ContentHandler)} - the Marshaller won't
* invoke {@link org.xml.sax.ContentHandler#startDocument()} and
* {@link org.xml.sax.ContentHandler#endDocument()}.
* - {@link #marshal(Object,org.w3c.dom.Node) marshal(Object,Node)} - the property has no effect on this
* API.
* - {@link #marshal(Object,java.io.OutputStream) marshal(Object,OutputStream)} - the Marshaller won't
* generate an xml declaration.
* - {@link #marshal(Object,java.io.Writer) marshal(Object,Writer)} - the Marshaller won't
* generate an xml declaration.
* - {@link #marshal(Object,javax.xml.transform.Result) marshal(Object,Result)} - depends on the kind of
* Result object, see semantics for Node, ContentHandler, and Stream APIs
* - {@link #marshal(Object,javax.xml.stream.XMLEventWriter) marshal(Object,XMLEventWriter)} - the
* Marshaller will not generate {@link javax.xml.stream.events.XMLEvent#START_DOCUMENT} and
* {@link javax.xml.stream.events.XMLEvent#END_DOCUMENT} events.
* - {@link #marshal(Object,javax.xml.stream.XMLStreamWriter) marshal(Object,XMLStreamWriter)} - the
* Marshaller will not generate {@link javax.xml.stream.events.XMLEvent#START_DOCUMENT} and
* {@link javax.xml.stream.events.XMLEvent#END_DOCUMENT} events.
*
*
*
*
*
*
* "The {@link Marshaller} 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
* marshalling. 'External listeners' allow for centralized processing
* of marshal 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 signatures:
*
*
* // Invoked by Marshaller after it has created an instance of this object.
* boolean beforeMarshal(Marshaller);
*
* // Invoked by Marshaller after it has marshalled all properties of this object.
* void afterMmarshal(Marshaller);
*
*
* The class defined event 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 a {@link Marshaller#setListener(Listener)}. The external listener receives all callback events,
* allowing for more centralized processing than per class defined callback methods.
*
* 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#beforeMarshal(Object)} and {@link Listener#afterMarshal(Object)}.
*
* An event callback method throwing an exception terminates the current marshal process.
*
*
* @author - Kohsuke Kawaguchi, Sun Microsystems, Inc.
- Ryan Shoemaker, Sun Microsystems, Inc.
- Joe Fialli, Sun Microsystems, Inc.
* @see JAXBContext
* @see Validator
* @see Unmarshaller
* @since JAXB1.0
*/
public interface Marshaller {
/**
* The name of the property used to specify the output encoding in
* the marshalled XML data.
*/
public static final String JAXB_ENCODING =
"jaxb.encoding";
/**
* The name of the property used to specify whether or not the marshalled
* XML data is formatted with linefeeds and indentation.
*/
public static final String JAXB_FORMATTED_OUTPUT =
"jaxb.formatted.output";
/**
* The name of the property used to specify the xsi:schemaLocation
* attribute value to place in the marshalled XML output.
*/
public static final String JAXB_SCHEMA_LOCATION =
"jaxb.schemaLocation";
/**
* The name of the property used to specify the
* xsi:noNamespaceSchemaLocation attribute value to place in the marshalled
* XML output.
*/
public static final String JAXB_NO_NAMESPACE_SCHEMA_LOCATION =
"jaxb.noNamespaceSchemaLocation";
/**
* The name of the property used to specify whether or not the marshaller
* will generate document level events (ie calling startDocument or endDocument).
*/
public static final String JAXB_FRAGMENT =
"jaxb.fragment";
/**
* Marshal the content tree rooted at jaxbElement into the specified
* javax.xml.transform.Result.
*
*
* All JAXB Providers must at least support
* {@link javax.xml.transform.dom.DOMResult},
* {@link javax.xml.transform.sax.SAXResult}, and
* {@link javax.xml.transform.stream.StreamResult}. It can
* support other derived classes of Result as well.
*
* @param jaxbElement
* The root of content tree to be marshalled.
* @param result
* XML will be sent to this Result
*
* @throws JAXBException
* If any unexpected problem occurs during the marshalling.
* @throws MarshalException
* If the {@link ValidationEventHandler ValidationEventHandler}
* returns false from its handleEvent method or the
* Marshaller is unable to marshal obj (or any
* object reachable from obj). See
* Marshalling a JAXB element.
* @throws IllegalArgumentException
* If any of the method parameters are null
*/
public void marshal( Object jaxbElement, javax.xml.transform.Result result )
throws JAXBException;
/**
* Marshal the content tree rooted at jaxbElement into an output stream.
*
* @param jaxbElement
* The root of content tree to be marshalled.
* @param os
* XML will be added to this stream.
*
* @throws JAXBException
* If any unexpected problem occurs during the marshalling.
* @throws MarshalException
* If the {@link ValidationEventHandler ValidationEventHandler}
* returns false from its handleEvent method or the
* Marshaller is unable to marshal obj (or any
* object reachable from obj). See
* Marshalling a JAXB element.
* @throws IllegalArgumentException
* If any of the method parameters are null
*/
public void marshal( Object jaxbElement, java.io.OutputStream os )
throws JAXBException;
/**
* Marshal the content tree rooted at jaxbElement into a file.
*
* @param jaxbElement
* The root of content tree to be marshalled.
* @param output
* File to be written. If this file already exists, it will be overwritten.
*
* @throws JAXBException
* If any unexpected problem occurs during the marshalling.
* @throws MarshalException
* If the {@link ValidationEventHandler ValidationEventHandler}
* returns false from its handleEvent method or the
* Marshaller is unable to marshal obj (or any
* object reachable from obj). See
* Marshalling a JAXB element.
* @throws IllegalArgumentException
* If any of the method parameters are null
* @since JAXB2.1
*/
public void marshal( Object jaxbElement, File output )
throws JAXBException;
/**
* Marshal the content tree rooted at jaxbElement into a Writer.
*
* @param jaxbElement
* The root of content tree to be marshalled.
* @param writer
* XML will be sent to this writer.
*
* @throws JAXBException
* If any unexpected problem occurs during the marshalling.
* @throws MarshalException
* If the {@link ValidationEventHandler ValidationEventHandler}
* returns false from its handleEvent method or the
* Marshaller is unable to marshal obj (or any
* object reachable from obj). See
* Marshalling a JAXB element.
* @throws IllegalArgumentException
* If any of the method parameters are null
*/
public void marshal( Object jaxbElement, java.io.Writer writer )
throws JAXBException;
/**
* Marshal the content tree rooted at jaxbElement into SAX2 events.
*
* @param jaxbElement
* The root of content tree to be marshalled.
* @param handler
* XML will be sent to this handler as SAX2 events.
*
* @throws JAXBException
* If any unexpected problem occurs during the marshalling.
* @throws MarshalException
* If the {@link ValidationEventHandler ValidationEventHandler}
* returns false from its handleEvent method or the
* Marshaller is unable to marshal obj (or any
* object reachable from obj). See
* Marshalling a JAXB element.
* @throws IllegalArgumentException
* If any of the method parameters are null
*/
public void marshal( Object jaxbElement, org.xml.sax.ContentHandler handler )
throws JAXBException;
/**
* Marshal the content tree rooted at jaxbElement into a DOM tree.
*
* @param jaxbElement
* The content tree to be marshalled.
* @param node
* DOM nodes will be added as children of this node.
* This parameter must be a Node that accepts children
* ({@link org.w3c.dom.Document},
* {@link org.w3c.dom.DocumentFragment}, or
* {@link org.w3c.dom.Element})
*
* @throws JAXBException
* If any unexpected problem occurs during the marshalling.
* @throws MarshalException
* If the {@link ValidationEventHandler ValidationEventHandler}
* returns false from its handleEvent method or the
* Marshaller is unable to marshal jaxbElement (or any
* object reachable from jaxbElement). See
* Marshalling a JAXB element.
* @throws IllegalArgumentException
* If any of the method parameters are null
*/
public void marshal( Object jaxbElement, org.w3c.dom.Node node )
throws JAXBException;
/**
* Marshal the content tree rooted at jaxbElement into a
* {@link javax.xml.stream.XMLStreamWriter}.
*
* @param jaxbElement
* The content tree to be marshalled.
* @param writer
* XML will be sent to this writer.
*
* @throws JAXBException
* If any unexpected problem occurs during the marshalling.
* @throws MarshalException
* If the {@link ValidationEventHandler ValidationEventHandler}
* returns false from its handleEvent method or the
* Marshaller is unable to marshal obj (or any
* object reachable from obj). See
* Marshalling a JAXB element.
* @throws IllegalArgumentException
* If any of the method parameters are null
* @since JAXB 2.0
*/
public void marshal( Object jaxbElement, javax.xml.stream.XMLStreamWriter writer )
throws JAXBException;
/**
* Marshal the content tree rooted at jaxbElement into a
* {@link javax.xml.stream.XMLEventWriter}.
*
* @param jaxbElement
* The content tree rooted at jaxbElement to be marshalled.
* @param writer
* XML will be sent to this writer.
*
* @throws JAXBException
* If any unexpected problem occurs during the marshalling.
* @throws MarshalException
* If the {@link ValidationEventHandler ValidationEventHandler}
* returns false from its handleEvent method or the
* Marshaller is unable to marshal obj (or any
* object reachable from obj). See
* Marshalling a JAXB element.
* @throws IllegalArgumentException
* If any of the method parameters are null
* @since JAXB 2.0
*/
public void marshal( Object jaxbElement, javax.xml.stream.XMLEventWriter writer )
throws JAXBException;
/**
* Get a DOM tree view of the content tree(Optional).
*
* If the returned DOM tree is updated, these changes are also
* visible in the content tree.
* Use {@link #marshal(Object, org.w3c.dom.Node)} to force
* a deep copy of the content tree to a DOM representation.
*
* @param contentTree - JAXB Java representation of XML content
*
* @return the DOM tree view of the contentTree
*
* @throws UnsupportedOperationException
* If the JAXB provider implementation does not support a
* DOM view of the content tree
*
* @throws IllegalArgumentException
* If any of the method parameters are null
*
* @throws JAXBException
* If any unexpected problem occurs
*
*/
public org.w3c.dom.Node getNode( java.lang.Object contentTree )
throws JAXBException;
/**
* Set the particular property in the underlying implementation of
* Marshaller. 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.
*
* @param 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.
* @param value the value of the property to be set
*
* @throws PropertyException when there is an error processing the given
* property or value
* @throws IllegalArgumentException
* If the name parameter is null
*/
public void setProperty( String name, Object value )
throws PropertyException;
/**
* Get the particular property in the underlying implementation of
* Marshaller. 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.
*
* @param name the name of the property to retrieve
* @return the value of the requested property
*
* @throws PropertyException
* when there is an error retrieving the given property or value
* property name
* @throws IllegalArgumentException
* If the name parameter is null
*/
public Object getProperty( String name ) throws PropertyException;
/**
* 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 marshal
* API's. If the client application does not register a validation event
* handler before invoking one of the marshal methods, then validation
* events will be handled by the default event handler which will terminate
* the marshal operation after the first error or fatal error is encountered.
*
* Calling this method with a null parameter will cause the Marshaller
* to revert back to the default default event handler.
*
* @param handler the validation event handler
* @throws JAXBException if an error was encountered while setting the
* event handler
*/
public void setEventHandler( ValidationEventHandler handler )
throws JAXBException;
/**
* Return the current event handler or the default event handler if one
* hasn't been set.
*
* @return 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
*/
public ValidationEventHandler getEventHandler()
throws JAXBException;
/**
* Associates a configured instance of {@link XmlAdapter} with this marshaller.
*
*
* This is a convenience method that invokes setAdapter(adapter.getClass(),adapter);.
*
* @see #setAdapter(Class,XmlAdapter)
* @throws IllegalArgumentException
* if the adapter parameter is null.
* @throws UnsupportedOperationException
* if invoked agains a JAXB 1.0 implementation.
* @since JAXB 2.0
*/
public void setAdapter( XmlAdapter adapter );
/**
* Associates a configured instance of {@link XmlAdapter} with this marshaller.
*
*
* Every marshaller internally maintains a
* {@link java.util.Map}<{@link Class},{@link XmlAdapter}>,
* which it uses for marshalling 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, a marshaller will create
* one by invoking its default constructor.
*
* @param 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.
* @param adapter
* The instance of the adapter to be used. If null, it will un-register
* the current adapter set for this type.
* @throws IllegalArgumentException
* if the type parameter is null.
* @throws UnsupportedOperationException
* if invoked agains a JAXB 1.0 implementation.
* @since JAXB 2.0
*/
public void setAdapter( Class type, A adapter );
/**
* Gets the adapter associated with the specified type.
*
* This is the reverse operation of the {@link #setAdapter} method.
*
* @throws IllegalArgumentException
* if the type parameter is null.
* @throws UnsupportedOperationException
* if invoked agains a JAXB 1.0 implementation.
* @since JAXB 2.0
*/
public A getAdapter( Class type );
/**
* Associate a context that enables binary data within an XML document
* to be transmitted as XML-binary optimized attachment.
* The attachment is referenced from the XML document content model
* by content-id URIs(cid) references stored within the xml document.
*
* @throws IllegalStateException if attempt to concurrently call this
* method during a marshal operation.
*/
void setAttachmentMarshaller(AttachmentMarshaller am);
AttachmentMarshaller getAttachmentMarshaller();
/**
* Specify the JAXP 1.3 {@link javax.xml.validation.Schema Schema}
* object that should be used to validate subsequent marshal operations
* against. Passing null into this method will disable validation.
*
*
* This method allows the caller to validate the marshalled XML as it's marshalled.
*
*
* Initially this property is set to null.
*
* @param schema Schema object to validate marshal operations against or null to disable validation
* @throws UnsupportedOperationException could be thrown if this method is
* invoked on an Marshaller created from a JAXBContext referencing
* JAXB 1.0 mapped classes
* @since JAXB2.0
*/
public void setSchema( Schema schema );
/**
* Get the JAXP 1.3 {@link javax.xml.validation.Schema Schema} object
* being used to perform marshal-time validation. If there is no
* Schema set on the marshaller, then this method will return null
* indicating that marshal-time validation will not be performed.
*
* @return the Schema object being used to perform marshal-time
* validation or null if not present.
* @throws UnsupportedOperationException could be thrown if this method is
* invoked on an Marshaller created from a JAXBContext referencing
* JAXB 1.0 mapped classes
* @since JAXB2.0
*/
public Schema getSchema();
/**
*
* Register an instance of an implementation of this class with a {@link Marshaller} to externally listen
* for marshal events.
*
*
* This class enables pre and post processing of each marshalled object.
* The event callbacks are called when marshalling from an instance that maps to an xml element or
* complex type definition. The event callbacks are not called when marshalling from an instance of a
* Java datatype that represents a simple type definition.
*
*
* External listener is one of two different mechanisms for defining marshal event callbacks.
* See Marshal Event Callbacks for an overview.
*
* @see Marshaller#setListener(Listener)
* @see Marshaller#getListener()
* @since JAXB2.0
*/
public static abstract class Listener {
/**
*
* Callback method invoked before marshalling from source to XML.
*
*
* This method is invoked just before marshalling process starts to marshal source.
* Note that if the class of source defines its own beforeMarshal method,
* the class specific callback method is invoked just before this method is invoked.
*
* @param source instance of JAXB mapped class prior to marshalling from it.
*/
public void beforeMarshal(Object source) {
}
/**
*
* Callback method invoked after marshalling source to XML.
*
*
* This method is invoked after source and all its descendants have been marshalled.
* Note that if the class of source defines its own afterMarshal method,
* the class specific callback method is invoked just before this method is invoked.
*
* @param source instance of JAXB mapped class after marshalling it.
*/
public void afterMarshal(Object source) {
}
}
/**
*
* Register marshal event callback {@link Listener} with this {@link Marshaller}.
*
*
* There is only one Listener per Marshaller. Setting a Listener replaces the previous set Listener.
* One can unregister current Listener by setting listener to null.
*
* @param listener an instance of a class that implements {@link Listener}
* @since JAXB2.0
*/
public void setListener(Listener listener);
/**
*
Return {@link Listener} registered with this {@link Marshaller}.
*
* @return registered {@link Listener} or null if no Listener is registered with this Marshaller.
* @since JAXB2.0
*/
public Listener getListener();
}